Yakima River 

Pesticides and PCBs 

Total Maximum Daily Load

Volume 1. Water Quality Study Findings 

April 2010 

Publication No. 10-03-018
Publication and Contact Information 

This report is available on the Department of Ecology’s website at 

www.ecy.wa.gov/biblio/1003018.html

For more information contact: 

Publications Coordinator 

Environmental Assessment Program 

P.O. Box 47600 

Olympia, WA 98504-7600 

Phone: 360-407-6764 

Washington State Department of Ecology - www.ecy.wa.gov/

o Headquarters, Olympia 360-407-6000 

o Northwest Regional Office, Bellevue 425-649-7000 

o Southwest Regional Office, Olympia 360-407-6300 

o Central Regional Office, Yakima 509-575-2490 

o Eastern Regional Office, Spokane 509-329-3400 

Project Codes 

Data for this project are available at Ecology’s Environmental Information Management (EIM) 

website www.ecy.wa.gov/eim/index.htm. Search User Study ID AJOH0055. 

Ecology’s Activity Tracker Code for this study is 07-078-02. 

TMDL Study Code (Water Quality Program) is YakR99TX. 

Cover photo: Upper Yakima River near Thorp (Jane Creech) 

Any use of product or firm names in this publication is for descriptive purposes only and 

does not imply endorsement by the author or the Department of Ecology. 

To ask about the availability of this document in a format for the visually impaired, 

call 360-407-6764. 

Persons with hearing loss can call 711 for Washington Relay Service. 

Persons with a speech disability can call 877-833-6341.

 
Yakima River 

Pesticides and PCBs 

Total Maximum Daily Load 

Volume 1. Water Quality Study Findings

 

by 

Art Johnson, 

Kristin Carmack 

Brandee Era-Miller 

Brandi Lubliner 

Steve Golding 

 Randy Coots 

Environmental Assessment Program 

Washington State Department of Ecology 

Olympia, Washington 98504-7710 

Waterbody Numbers 

Upper Yakima River (39-1010, 39-1030, 39-1060, 39-1070) and tributaries 

Lower Yakima River (37-1010, 37-1020, 37-1040) and tributaries 

Naches River (38-1010, 38-1030, 38-1040) and tributaries 
This page is purposely left blank 
Yakima Pesticides/PCBs TMDL: Vol 1, WQ Study Findings 

Page i 

Table of Contents 

Page

List of Figures ......................................................................................................................v

List of Tables ..................................................................................................................... ix

Abstract ............................................................................................................................ xiii

Acknowledgements .......................................................................................................... xiv

Executive Summary ...........................................................................................................xv

Total Maximum Daily Loads .......................................................................................xv

Watershed Description .................................................................................................xv

Yakima River 303(d) Listings .................................................................................. xvii

Existing TMDLs ...................................................................................................... xviii

2006 Fish Tissue Survey ............................................................................................ xix

2007-08 Water Quality Study ......................................................................................xx

Water Quality Study Findings ................................................................................... xxi

Pollutants for Which a TMDL or Other Pollution Control Plan is Needed ............. xxiii

Numeric TMDL Targets and Loading Capacity ...................................................... xxiv

Recommendations .................................................................................................... xxiv

What is a Total Maximum Daily Load (TMDL)? ...............................................................1

Federal Clean Water Act Requirements ........................................................................1

TMDL Process Overview ..............................................................................................1

Elements Required in a TMDL ......................................................................................2

Why is Ecology Conducting a TMDL Study in This Watershed? ......................................3

Overview ........................................................................................................................3

Study Area .....................................................................................................................4

Yakima Basin Waterbodies on Ecology’s 303(d) List of Impaired Waters ..................5

Pollutants Addressed by This TMDL ............................................................................7

Water Quality Standards ......................................................................................................9

Designated Uses .............................................................................................................9

Toxics .............................................................................................................................9

Aquatic Life .........................................................................................................10

Human Health ......................................................................................................10

Turbidity ......................................................................................................................11

Watershed Description .......................................................................................................13

Yakima River Basin .....................................................................................................13

Yakama Nation ............................................................................................................15

Streamflow and the Irrigation System .........................................................................15

Previous Water Quality Studies ...................................................................................19

Existing Yakima River TMDLs .........................................................................................21

Lower Yakima River Suspended Sediment and DDT TMDL .....................................21

Upper Yakima River Suspended Sediment and Organochlorine Pesticide TMDL .....22

2006 Yakima River Fish Tissue Survey ............................................................................23
Yakima Pesticides/PCBs TMDL: Vol 1, WQ Study Findings 

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Goals and Objectives of the 2007-08 Water Quality Study ..............................................27

Goals ............................................................................................................................27

Objectives ....................................................................................................................27

Study Design ......................................................................................................................29

Surface Water ...............................................................................................................31

Pesticides, Suspended Sediment, and Turbidity ..................................................31

PCBs and Toxaphene ..........................................................................................36

Permitted Discharges ...................................................................................................41

Municipal Wastewater Treatment Plants .............................................................41

Fruit Packers and Vegetable Processors ..............................................................44

Urban Stormwater Runoff ...................................................................................45

Number of Samples......................................................................................................49

Other Sources of Contamination ..................................................................................49

Field Procedures .................................................................................................................51

Surface Water ...............................................................................................................51

Routine Monitoring and Screening Survey .........................................................51

Semipermeable Membrane Devices ....................................................................52

Wastewater Treatment Plants ......................................................................................52

Fruit Packers and Vegetable Processors ......................................................................53

Stormwater ...................................................................................................................53

Laboratory Methods ...........................................................................................................54

Data Quality Assessment ...................................................................................................55

Data Review and Verification ......................................................................................55

Field Blanks .................................................................................................................56

Replicate Samples ........................................................................................................56

Results of the 2007-08 Water Quality Study .....................................................................59

Water Supply ...............................................................................................................59

Surface Water Quality ..................................................................................................61

Pesticides .............................................................................................................61

PCBs and Toxaphene ........................................................................................102

Suspended Sediment ..........................................................................................108

Turbidity ............................................................................................................116

Permitted Discharges .................................................................................................128

Municipal Wastewater Treatment Plants ...........................................................128

Fruit Packers and Vegetable Processors ............................................................135

Urban Stormwater Runoff .................................................................................139

Point and Nonpoint Sources Compared .....................................................................148

Status of 303(d) Listed Chemicals and Toxaphene in the Yakima River ........................154

Pollutants for which a TMDL or Other Control Plan is Needed ....................................157

PCBs, Dioxin, Chlorpyrifos, and Chlordane ...................................................................159

PCBs ..........................................................................................................................159

Dioxin ........................................................................................................................159

Chlorpyrifos ...............................................................................................................160

Chlordane ...................................................................................................................161
Yakima Pesticides/PCBs TMDL: Vol 1, WQ Study Findings 

Page iii 

Pollutants Not Exceeding Standards ................................................................................162

Numeric TMDL Targets ..................................................................................................163

Pesticide and PCB Targets .........................................................................................163

Suspended Sediment and Turbidity Targets ..............................................................163

Loading Capacity .............................................................................................................173

Pollutant Reductions Needed ...........................................................................................177

Turbidity ....................................................................................................................177

Pesticides and PCBs ...................................................................................................177

Conclusions ......................................................................................................................179

Recommendations ............................................................................................................181

303(d) Listings/TMDL...............................................................................................181

Source Tracing ...........................................................................................................181

Monitoring .................................................................................................................181

References ........................................................................................................................183

Appendices .......................................................................................................................191

Appendix A. Yakima Basin 303(d) Listings Based on Edible Fish Tissue Samples 

(2008 list) ...................................................................................................................193

Appendix B. Yakima Basin 303(d) Listings Based on Water Samples (2008 list) ..195

Appendix C. Use Designations for WRIA 37- Lower Yakima River, 

WRIA 38-Naches River, and WRIA 39-Upper Yakima River .................................197

Appendix D. 2006 Fish Tissue Data .........................................................................205

Appendix E. Pesticides Analyzed in Surface Water and in Effluents from Fruit 

Packers and Vegetable Processors during the 2007-08 Yakima River Water 

Quality Study .............................................................................................................215

Appendix F. Deployment Dates and PRC Recovery for SPMDs .............................217

Appendix G. Ancillary Water Quality Data for SPMD Deployments ......................219

Appendix H. SPMD Calculations .............................................................................223

Appendix I. Pesticides Analyzed in Wastewater Treatment Plant Effluents and 

Urban Stormwater Runoff during the 2007-08 Yakima River Water Quality Study 224

Appendix J. Routine Monitoring Data for Surface Water, 2007-08 .........................225

Appendix K. Screening Survey Data for Surface Water, 2007-08 ...........................261

Appendix L. Washington State Department of Health Fish Consumption 

Advisory .....................................................................................................................285

Appendix M. SPMD Data, 2007-08 .........................................................................287

Appendix N. Wastewater Treatment Plant Effluent Data, 2007-08 .........................289

Appendix O. Fruit Packer and Vegetable Processor Effluent Data, 2007-08 ...........301

Appendix P. Stormwater Data, 2007-08 ...................................................................307

Appendix Q. Values of Potential Use for Calculating Stormwater Loads to the 

Yakima River from Sunnyside and Richland (using the Simple Method) ................321

Appendix R. Glossary, Acronyms, and Abbreviations .............................................323

 
Yakima Pesticides/PCBs TMDL: Vol 1, WQ Study Findings 

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This page is purposely left blank 
Yakima Pesticides/PCBs TMDL: Vol 1, WQ Study Findings 

Page v 

List of Figures 

 Page

Figure 1. Water Resource Inventory Areas for Yakima River Pesticides and PCBs 

TMDL. .................................................................................................................................4

Figure 2. Yakima River Basin. .........................................................................................14

Figure 3. Monthly Average Flow in the Yakima River, Sulphur Creek Wasteway, 

and Granger Drain. .............................................................................................................16

Figure 4. Relative Position of Selected Tributaries, Diversions, Irrigation Returns, 

and Other Features on the Yakima River. ..........................................................................17

Figure 5. Mean DDE Concentrations in Yakima River Fish Fillets Collected in 2006 ....25

Figure 6. Mean Total PCB Concentrations in Yakima River Fish Fillets Collected 

in 2006. ..............................................................................................................................25

Figure 7. Routine Monitoring Stations in the Lower Yakima River for 2007-08. ...........32

Figure 8. Lower Yakima River Tributaries and Irrigation Returns Screened for 

Pesticides during 2007-08. .................................................................................................34

Figure 9. SPMD Membrane Mounted on a Spider Carrier. ..............................................36

Figure 10. Sites Where SPMDs Were Deployed in the Upper Yakima River 

during 2007. .......................................................................................................................38

Figure 11. Sites Where SPMDs Were Deployed in the Lower Yakima River 

during 2007. .......................................................................................................................39

Figure 12. Monthly Average Flow near Selected SPMD Sites during 2007. ...................40

Figure 13. Wastewater Treatment Plants in the Lower Yakima River Basin. ..................43

Figure 14. Fruit Packers and Vegetable Processors Monitored in the Lower Yakima 

River Basin during 2007-08. ..............................................................................................45

Figure 15. Location of Yakima and Union Gap Storm Drains Sampled during 

2007-08. .............................................................................................................................47

Figure 16. Location of Ellensburg Storm Drains Sampled during 2007-08. ....................48

Figure 17. Historical Flow in the Yakima River vs. Flow during the 2007-08 Water 

Quality Study. ....................................................................................................................59

Figure 18. Annual Mean Flow in the Yakima River at Kiona, 1994-2007. .....................60

Figure 19. Detection Frequency of Selected 303(d) Listed Pesticides in the Mainstem 

Lower Yakima River and Naches River during 2007-08 ..................................................63

Figure 20. Percent of Un-degraded DDT in Water Samples From Four Major 

Irrigation Returns to the Lower Yakima River during 2007-08: Moxee Drain, 

Granger Drain, Sulfur Creek Wasteway, and Spring Creek. .............................................65
Yakima Pesticides/PCBs TMDL: Vol 1, WQ Study Findings 

Page vi 

Figure 21. Detection Frequency of Selected 303(d) Listed Pesticides in Four Major 

Irrigation Returns to the Lower Yakima River during 2007-08 ........................................66

Figure 22. Percent of Samples Exceeding Human Health Criteria for DDE, DDT, and 

Dieldrin in Four Major Irrigation Returns to the Lower Yakima River during 2007-08. .69

Figure 23. Average Total DDT Concentrations in the Lower Yakima River during 

the 2007 Irrigation Season. ................................................................................................72

Figure 24. Average Dieldrin Concentrations in the Lower Yakima River during the 

2007 Irrigation Season. ......................................................................................................73

Figure 25. Seasonal Patterns in DDE and Total DDT at Two Sites in the Lower 

Mainstem Yakima River ....................................................................................................74

Figure 26. Seasonal Patterns in Dieldrin Concentrations at Two Sites in the Lower 

Mainstem Yakima River ....................................................................................................75

Figure 27. Seasonal Patterns in Endosulfan and Chlorpyrifos Concentrations at Two 

Sites in the Lower Mainstem Yakima River. .....................................................................76

Figure 28. Endosulfan Concentrations in the Lower Yakima River on April 4-5, 

2007....................................................................................................................................77

Figure 29. Chlorpyrifos Concentrations in the Lower Yakima River on April 4-5, 

2007....................................................................................................................................78

Figure 30. DDT Compounds and Dieldrin in Moxee Drain during 2007-08. ..................79

Figure 31. DDT Compounds and Dieldrin in Granger Drain during 2007-08. ................80

Figure 32. DDT Compounds and Dieldrin in Sulphur Creek Wasteway during 

2007-08. .............................................................................................................................81

Figure 33. DDT Compounds and Dieldrin in Spring Creek during 2007-08. ..................82

Figure 34. Endosulfan and Chlorpyrifos in Four Major Irrigation Returns to the 

Yakima River during 2007-08. ..........................................................................................83

Figure 35. Chlorpyrifos Concentrations in Sulphur Creek Wasteway and Spring Creek 

Compared to Results from the SWMP...............................................................................85

Figure 36. Average Loads of Selected 303(d) Pesticides during the 2007 Irrigation 

Season (grams per day). ....................................................................................................87

Figure 37. Average Combined Pesticide Loading from Moxee Drain, Granger Drain, 

Sulphur Creek Wasteway, and Spring Creek as a Percentage of the Average Load in 

the Yakima River @ Kiona during 2007-08. ....................................................................89

Figure 38. Concentration:Criteria Ratios for DDT compounds and Dieldrin in 

23 Tributaries and Irrigation Returns to the Lower Yakima River ....................................91

Figure 39. Percent of Samples Exceeding Human Health or Chronic Aquatic Life 

Criteria ...............................................................................................................................93

Figure 40. Chlorpyrifos Concentrations Measured in Marion Drain Compared to 

Results from the SWMP. ...................................................................................................94
Yakima Pesticides/PCBs TMDL: Vol 1, WQ Study Findings 

Page vii 

Figure 41. Results from Monitoring Dieldrin and Endosulfan in Wide Hollow Creek 

in 2005-06 ..........................................................................................................................95

Figure 42. Pesticide Levels in the Lower Yakima River Drainage, 1988-2008 ...............97

Figure 43. DDE and Dieldrin in Fillets from Lower Yakima River Fish: 1995, 1998, 

and 2006 ...........................................................................................................................101

Figure 44. Estimated PCB and Toxaphene Concentrations in the Mainstem Yakima 

River, Tributaries, and Irrigation Returns during and after the 2007 Irrigation Season ..104

Figure 45. Estimates of PCB and Toxaphene Loads in the Yakima River during 

May-June, 2007................................................................................................................107

Figure 46. Total Suspended Solids Concentrations in the Mainstem Lower Yakima 

River during 2007-08, Showing the Flow at Kiona. ........................................................109

Figure 47. Average Total Suspended Solids Concentrations in the Lower Yakima 

River during the 2007 Irrigation Season ..........................................................................110

Figure 48. Average Total Suspended Solids Concentrations in the Lower Yakima 

River on June 6-7, 2007 ...................................................................................................111

Figure 49. Total Suspended Solids and Flow in Major Lower Yakima River 

Irrigation Returns during 2007-08. ..................................................................................112

Figure 50. Estimates of Suspended Sediment Loads in the Lower Yakima River 

during the 2007 Irrigation Season. ...................................................................................114

Figure 51. Turbidity in the Lower Yakima River during 2007-08 Compared to the 

State Turbidity Criteria and 2002 TMDL Target. ............................................................118

Figure 52. Compliance with the 90th Percentile 25 NTU Turbidity Target in Four 

Major Irrigation Returns to the Lower Yakima River during the 2007 Irrigation 

Season ..............................................................................................................................119

Figure 53. Turbidity and Flow in Four Major Lower Yakima River Irrigation 

Returns during 2007-08. ..................................................................................................120

Figure 54. Comparison of Turbidity Data Collected by Ecology and the 

Roza-Sunnyside Board of Joint Control during 2007-08 ................................................122

Figure 55. Turbidity in Screening Survey Samples from 23 Other Tributaries and 

Irrigation Returns to the Lower Yakima River during 2007-08. .....................................124

Figure 56. 90th Percentile Turbidity in Four Major Returns to the Lower Yakima 

River during the 1995, 2003, and 2007 Irrigation Seasons. .............................................125

Figure 57. Trend Analysis of Ecology’s Ambient Monitoring Data on Turbidity in 

the Yakima River at Kiona ..............................................................................................127

Figure 58. PCB Concentrations in Final Effluents from WWTPs in the Yakima 

Basin during 2007-08 Compared to Human Health Criterion .........................................130

Figure 59. Total PCB Concentrations in Final Effluents from Yakima Basin WWTPs 

during 2007-08. ................................................................................................................131
Yakima Pesticides/PCBs TMDL: Vol 1, WQ Study Findings 

Page viii 

Figure 60. PCB Concentrations in Yakima Basin WWTP Effluents by Month of 

Sample Collection, 2007-08.............................................................................................131

Figure 61. WWTP Effluent Flow during Monitoring Periods in 2007-08 vs. Design 

Flow. ................................................................................................................................134

Figure 62. Percent of Fruit Packer and Vegetable Processor Effluent Samples 

Exceeding Human Health Criteria (DDT compounds and dieldrin) or Chronic 

Aquatic Life Criteria (total DDT) ....................................................................................137

Figure 63. Correlation between Total DDT and Total Suspended Solids in Fruit 

Packer and Vegetable Processor Effluents. .....................................................................138

Figure 64. Precipitation in Yakima during the 2007-08 Water Quality Study, 

Showing When Stormwater Samples Were Collected (Yakima airport). ........................139

Figure 65. Percent of Yakima/Union Gap Stormwater Samples Exceeding Human 

Health Criteria for 303(d) Listed Pesticides and PCBs during 2007-08. .........................142

Figure 66. Median Concentrations of Selected Pollutants in the Lower Yakima 

River Drainage during 2007-08 .......................................................................................149

Figure 67. Loading Comparison for Selected Pollutants Analyzed in 2007-08. ............150

Figure 68. Total DDT:TSS Correlation in the Lower Yakima River Drainage: 

1988-1995 vs. 2007 Irrigation Seasons. ...........................................................................165

Figure 69. Total DDT:TSS Correlation in the Lower Yakima River Drainage, 

April 2007-March 2008. ..................................................................................................166

Figure 70. Relationship between Turbidity and Total Suspended Solids in the 

Lower Yakima River Drainage during 2007-08 ..............................................................166

Figure 71. Total DDT:TSS Correlation in Moxee Drain and Spring Creek during 

April 2007-March 2008. ..................................................................................................167

Figure 72. Total DDT:TSS Correlation in Sulphur Creek Wasteway during 

April 2007-March 2008. ..................................................................................................168

Figure 73. Total DDT:TSS Correlation in Granger Drain during April 2007- 

March 2008. .....................................................................................................................169

Figure 74. Relationship Between DDE and Total DDT in the Yakima River, 

Tributaries, and Irrigation Returns during 2007-08 .........................................................169

Figure 75. Total DDT vs. Turbidity in Selected Tributaries and Irrigation Returns 

from the 2007-08 Screening Survey, Highlighting Low Turbidity Samples that 

Exceeded the 1 ng/L Total DDT Criterion. .....................................................................170
Yakima Pesticides/PCBs TMDL: Vol 1, WQ Study Findings 

Page ix 

List of Tables

 Page

Table 1. Summary of 303(d) Listings for Chemical Contaminants in the Yakima 

River Basin (2008 list). ........................................................................................................6

Table 2. Pollutants Being Addressed in This TMDL. ........................................................7

Table 3. Washington State Water Quality Criteria for 303(d) Listed Pesticides, 

PCBs, and Toxaphene in the Yakima River Basin ..............................................................9

Table 4. Freshwater Edible Fish Tissue Criteria for 303(d) Listed Pesticides, 

Toxaphene, PCBs, and Dioxin in Yakima River Fish. ......................................................11

Table 5. Summary of Lower Yakima River TMDL Schedule. .........................................21

Table 6. Summary of Upper Yakima River TMDL Schedule. .........................................22

Table 7. Mean Concentrations of Selected 303(d) Listed Compounds and Toxaphene 

in Composite Fillet Samples from Yakima River Fish Collected in 2006. .......................24

Table 8. Summary of Sampling Design for the 2007-08 Water Quality Study. ...............30

Table 9. Routine Monitoring Stations in the Lower Yakima River Drainage during 

2007-08. .............................................................................................................................31

Table 10. Lower Yakima River Tributaries and Irrigation Returns Screened for 

Pesticides during 2007-08. .................................................................................................33

Table 11. Sites Where SPMDs Were Deployed in the Yakima River Drainage 

during 2007. .......................................................................................................................37

Table 12. Wastewater Treatment Plants in the Yakima Basin. .........................................42

Table 13. Fruit Packers and Vegetable Processors Monitored during 2007-08. ..............44

Table 14. Number of Samples Collected for the 2007-08 Water Quality Study. .............49

Table 15. Field Procedures for Water Samples. ...............................................................51

Table 16. Laboratory Methods.for Water Samples ...........................................................54

Table 17. Mean Relative Percent Difference Between Replicate Field Samples 

Analyzed during the 2007-08 Water Quality Study. .........................................................57

Table 18. Summary of Results from Monitoring 303(d) Listed Pesticides at Four 

Locations in the Mainstem Lower Yakima River and in the Naches River during 

2007-08: Yakima River at Harrison Bridge, Naches River at mouth, Yakima River at 

Parker Bridge, Yakima River at Euclid Bridge, Yakima River at Kiona Bridge. ...........62

Table 19. Summary of Results from Monitoring 303(d) Listed Pesticides in Four 

Major Irrigation Returns to the Lower Yakima River during 2007-08: Moxee Drain, 

Granger Drain, Sulphur Creek Wasteway, Spring Creek. .................................................64
Yakima Pesticides/PCBs TMDL: Vol 1, WQ Study Findings 

Page x 

Table 20. Percent of Samples Exceeding Human Health Criteria for 303(d) Listed 

Pesticides in the Mainstem Lower Yakima River and Naches River during 2007-08. .....67

Table 21. Percent of Samples Exceeding Human Health Criteria for 303(d) Listed 

Pesticides in Four Major Irrigation Returns to the Lower Yakima River during 

2007-08. ...........................................................................................................................68

Table 22. Percent of Samples Exceeding Chronic Aquatic Life Criteria for 303(d) 

Listed Pesticides in the Mainstem Lower Yakima River and Naches River during 

2007-08. .............................................................................................................................70

Table 23. Percent of Samples Exceeding Chronic Aquatic Life Criteria for 303(d) 

Listed Pesticides in Four Major Irrigation Returns to the Lower Yakima River during 

2007-08. ............................................................................................................................71

Table 24. Summary of Chlorpyrifos Data Reported for Sulphur Creek Wasteway 

and Spring Creek by SWMP. .............................................................................................86

Table 25. Average Loads of Selected 303(d) Pesticides during the 2007 Irrigation 

Season. ...............................................................................................................................86

Table 26. Summary of Results from Screening for 303(d) Listed Pesticides in 

23 Tributaries and Irrigation Returns to the Lower Yakima River during 2007-08. .........90

Table 27. Lower Yakima River Irrigation Returns that Substantially Exceeded 

Human Health or Chronic Aquatic Life Criteria in Screening Samples Collected 

during 2007-08. ..................................................................................................................92

Table 28. Instances Where a High Proportion of Un-degraded DDT was Found 

in 2007-08 Screening Survey Samples. .............................................................................92

Table 29. Pesticide Loads from 23 Screening Survey Tributaries and Irrigation 

Returns Compared to Loads from the Four Major Returns: Moxee Drain, Granger 

Drain, Sulfur Creek Wasteway, and Spring Creek. ...........................................................96

Table 30. Estimated PCB and Toxaphene Concentrations in the Yakima River, 

Tributaries, and Irrigation Returns during Spring and Fall 2007. ....................................103

Table 31. Estimates of PCB and Toxaphene Loads during May-June 2007. .................106

Table 32. Summary of Results from Monitoring Total Suspended Sediment (TSS) 

in the Lower Yakima River during the 2007 Irrigation Season. ......................................108

Table 33. Estimates of Suspended Sediment Loads in the Mainstem Yakima River, 

Naches River, and Major Irrigation Returns during the 2007 Irrigation Season. ............113

Table 34. Volatile Solids as Percent of Total Suspended Solids in the Yakima River, 

Naches River, and Four Major Irrigation Returns, 2007-08. ...........................................115

Table 35. Summary of Results from Monitoring Turbidity in the Lower Yakima 

River during the 2007 Irrigation Season. .........................................................................116

Table 36. Background Turbidity (90th percentile) in the Lower Yakima River: 

Previous TMDL, Effectiveness Monitoring, and Present Study. .....................................117
Yakima Pesticides/PCBs TMDL: Vol 1, WQ Study Findings 

Page xi 

Table 37. Percent of Samples Exceeding the Existing TMDL Turbidity Target in 

the Mainstem Lower Yakima River during 2007-08. ......................................................119

Table 38. Comparison of Turbidity Data Collected by Ecology and the RozaSunnyside Board of Joint Control during the 2007 Irrigation Season. ...........................123

Table 39. Compliance with Turbidity Criteria and TMDL Targets in the Lower 

Yakima River Drainage during 2007-08. .........................................................................124

Table 40. Summary of Results from Monitoring 303(d) Listed Pesticides, PCBs, 

TSS, and Turbidity in Final Effluents from Wastewater Treatment Plants in the 

Yakima Basin during 2007-08. ........................................................................................129

Table 41. Summary of Low-Level PCB, DDT, and Dieldrin Data for Eastern 

Washington WWTP Effluents. ........................................................................................132

Table 42. Summary of Total PCB Loads Measured in Final Effluents from Yakima 

Basin WWTPs during 2007-08. .......................................................................................133

Table 43. Summary of Results from Monitoring 303(d) Listed Pesticides and 

Toxaphene in Effluents from Six Fruit and Vegetable Processors in the Lower 

Yakima Basin during 2007-08. ........................................................................................135

Table 44. Percent of Fruit Packer and Vegetable Processor Effluent Samples 

Exceeding Water Quality Criteria for 303(d) Listed Pesticides during 2007-08. ............136

Table 45. Summary of Pesticide Loads Measured in Combined Final Effluents from 

Fruit Packers and Vegetable Processors that Discharge to Surface Water in the 

Lower Yakima River Drainage during 2007-08. ............................................................137

Table 46. Summary of Results from Monitoring TSS and Turbidity in Effluents 

from Six Fruit Packers and Vegetable Processors in the Lower Yakima Basin 

during 2007-08. ................................................................................................................138

Table 47. Rainfall Prior To and During Stormwater Sampling in Yakima/Union Gap 

During 2007-08. ...............................................................................................................140

Table 48. Summary of Results from Analyzing 303(d) Listed Pesticides and 

Toxaphene in Yakima/Union Gap Stormwater during 2007-08. .....................................140

Table 49. Summary of Results from Analyzing PCBs in Yakima/Union Gap and 

Ellensburg Stormwater during 2007-08. (ng/L, parts per trillion) .................................141

Table 50. Summary of Results from Analyzing TSS and Turbidity in Yakima/Union 

Gap and Ellensburg Stormwater during 2007-08. ...........................................................143

Table 51. Comparison of 303(d) Pesticide, PCB, and TSS Levels Measured in 

Urban Stormwater Samples in Eastern Washington. (Median values) ...........................144

Table 52. Values Used to Calculate Stormwater Loads from Yakima/Union Gap 

and Ellensburg. ................................................................................................................146

Table 53. Estimated Loading of 303(d) Listed Pesticides and PCBs in Stormwater 

Runoff from Yakima/Union Gap and Ellensburg. ...........................................................147
Yakima Pesticides/PCBs TMDL: Vol 1, WQ Study Findings 

Page xii 

Table 54. Estimated TSS Loading in Stormwater from Yakima/Union Gap and 

Ellensburg. .......................................................................................................................147

Table 55. Relative Importance of Point and Nonpoint Loads to Lower Yakima River. 153

Table 56. Summary of Water Quality Exceedances in Yakima River Storage 

Reservoirs, Mainstem Yakima River, and Naches River for 303(d) Listed Chemicals 

and Toxaphene during Ecology’s 2006-08 Fish Tissue and Water Quality Studies. ......155

Table 57. Summary of Water Quality Exceedances in Tributaries and Irrigation 

Returns of the Yakima and Naches Rivers for 303(d) Listed Chemicals and 

Toxaphene. .......................................................................................................................156

Table 58. Yakima Basin WRIAs Where a TMDL or Other Pollution Control Plan 

is Needed. .........................................................................................................................157

Table 59. Potential Unlisted Waterbody Impairments in the Yakima River Drainage ..158

Table 60. Locations and Pollutants Where a TMDL is No Longer Required. ...............162

Table 61. Numeric TMDL Targets (Water Quality Criteria) for Pesticides and 

PCBs That Currently Exceed Standards in the Yakima River, Tributaries, or 

Irrigation Returns. ............................................................................................................163

Table 62. Existing TMDL Targets for Turbidity and Total Suspended Solids in the 

Yakima River. ..................................................................................................................164

Table 63. Revised TMDL Targets Proposed for Turbidity in the Lower Yakima 

River. ................................................................................................................................171

Table 64. Loading Capacity Estimates for Meeting Human Health Criteria for DDT 

Compounds, Dieldrin, Chlordane, Toxaphene, and PCBs in the Yakima River. ............174

Table 65. Loading Capacity Estimates for Meeting Chronic Aquatic Life Criteria 

for Total DDT and Toxaphene in the Yakima River. ......................................................175

Table 66. Loading Capacity Estimates for Meeting Chronic Aquatic Life Criterion 

for Chlorpyrifos in the Yakima River. .............................................................................176

Table 67. Loading Capacity Estimates for Meeting Acute Aquatic Life Criterion 

for Chlorpyrifos in the Yakima River. .............................................................................176

Table 68. Percent Reductions Needed to Meet the Existing TMDL Turbidity Target 

in the Lower Yakima River Mainstem during the 2007 Irrigation Season. .....................177

Table 69. Estimates of Loading Reductions Needed in the Mainstem Lower Yakima 

River to Meet Human Health Criteria of DDE, Dieldrin, Chlordane, Toxaphene, 

and Total PCBs. ...............................................................................................................178
Yakima Pesticides/PCBs TMDL: Vol 1, WQ Study Findings 

Page xiii 

Abstract 

The Yakima River, along with several of its tributaries and irrigation returns, is on the federal 

Clean Water Act 303(d) list for not meeting Washington State water quality standards for a range 

of chemical contaminants. The chemicals include six legacy pesticides or breakdown products 

(DDT, DDE, DDD, dieldrin, chlordane, and alpha-BHC), two current use insecticides 

(endosulfan and chlorpyrifos), polychlorinated biphenyls (PCBs), and dioxin (2,3,7,8-TCDD). 

All of these chemicals have exceeded Washington State water quality criteria for protection of 

human health for fish consumption or criteria for protection of aquatic life. Except for 

endosulfan and chlorpyrifos, these legacy pollutants are no longer produced or used in the United 

States. 

The Clean Water Act requires a Total Maximum Daily Load (TMDL) be developed for every 

waterbody and pollutant on the 303(d) list. A TMDL is a written, quantitative assessment of 

water quality problems and pollutant sources that cause the problems. The TMDL determines 

the amount (load) of a pollutant that can be discharged to the waterbody and allocates the load 

among sources. 

The Washington State Department of Ecology conducted a fish tissue survey in 2006 and a water 

quality study in 2007-08 (present report) in the Yakima River basin to aid in developing a TMDL 

for the 303(d) listed chemicals. Dioxin was excluded from the water quality study due to budget 

constraints and because the fish tissue survey showed human health criteria were very close to 

being met. 

The water quality study analyzed 303(d) pesticides, PCBs, suspended sediment, and turbidity in 

surface waters, municipal wastewater treatment plant effluents, fruit packer and vegetable 

processor effluents, and urban stormwater runoff. The chemical analysis was expanded to 

include toxaphene, an unlisted legacy pesticide detected in the fish tissue survey. This report 

describes how the study was conducted and analyzes the data in terms of compliance with water 

quality criteria, temporal and seasonal patterns, trends, pollutant loading, and the relative 

importance of sources. 

Numeric water quality targets are described for bringing the Yakima River into compliance with 

water quality standards for DDT compounds, dieldrin, chlordane, chlorpyrifos, PCBs, toxaphene, 

and turbidity. The river’s loading capacity is calculated for these pollutants. 

Endosulfan, chlordane (upper Yakima River only), alpha-BHC, and dioxin (Keechelus Reservoir 

only) are now meeting standards and should be removed from the 303(d) list during the next 

listing cycle. The report concludes with additional recommendations for the TMDL, 303(d) 

listing, source tracing, and monitoring. 
Yakima Pesticides/PCBs TMDL: Vol 1, WQ Study Findings 

Page xiv 

Acknowledgements 

The authors thank the following people for their contribution to this study: 

 The Yakama Nation for giving permission to collect samples on the Yakama Reservation. 

 Elaine Brouillard of the Roza-Sunnyside Board of Joint Control, Marie Zuroske of the South 

Yakima Conservation District, Kathleen Satnik of the Kittitas County Water Purveyors, and 

Roger Satnik of the Kittitas Reclamation District for advice on study design, access to 

sampling sites, and sharing data. 

 U.S. Bureau of Reclamation, Kittitas Reclamation District, Kennewick Irrigation District, 

Sunnyside Valley Irrigation District and Board of Control, and Columbia Irrigation District 

for access to diversion dams. 

 Yakima basin wastewater treatment plant operators for their cooperation in obtaining effluent 

samples. 

 Andrus & Roberts, Apple King, ConAgra Foods – Lamb Weston, Gilbert Orchards, Snokist, 

and Zirkle Fruit for their cooperation in obtaining effluent samples. 

 JD Zimny, John Akers, and Irma Grogan of the City of Ellensburg, and Brett Sheffield and 

Randy Meloy of the City of Yakima, for advice on stormwater sampling. 

 The Bunnel family for access to Spring Creek. 

 Sandra Embrey, U.S. Geological Survey, for providing water quality data. 

 Helen Rueda, U.S. Environmental Protection Agency, Region 10, for review comments on 

the final report. 

 Staff with the Washington State Department of Ecology 

o Mark Peterschmidt, Jane Creech, Ryan Anderson, and Greg Bohn of the Central Regional 

Office Yakima River TMDL Team for project guidance, help with field work, and review 

comments on the final report 

o Chris Coffin, Jenna Durkee, Dan Dugger, and others for assistance with field work. 

o Manchester Environmental Laboratory for analyzing project samples and reviewing the 

laboratory data. 

o Dale Norton, Toxics Studies Unit supervisor, for project support and guidance. 

o Joe Joy for advice on study design and data analysis. 

o Dave Hallock for trend analysis of turbidity data. 

o Harriet Beale, Helen Bresler, and Melissa Gildersleeve, Water Quality Program, for 

advice on stormwater issues. 

o Mike Woodall, Geographic Information System (GIS) Technical Services, for preparing 

Figure 1. 

o Dale Norton, Paul Pickett, Cheryl Niemi, Melissa Gildersleeve, and Helen Bresler for 

review comments on the draft report. 

o Joan LeTourneau, Cindy Cook, and Gayla Lord for formatting and proofreading the final 

report. 
Yakima Pesticides/PCBs TMDL: Vol 1, WQ Study Findings 

Page xv 

Executive Summary 

Total Maximum Daily Loads 

Section 303(d) of the federal Clean Water Act requires states to prepare a list every two years of 

waterbodies that do not meet water quality standards. In Washington, the 303(d) list is compiled 

by the Washington State Department of Ecology (Ecology). The Clean Water Act requires that a 

Total Maximum Daily Load (TMDL) be developed for every waterbody and pollutant on the list. 

TMDLs must be approved by the U.S. Environmental Protection Agency (EPA). 

A TMDL includes a written, quantitative assessment of water quality problems and pollutant 

sources that cause the problems. The TMDL determines the amount of a pollutant that can be 

discharged to the waterbody and still meet standards (the loading capacity) and allocates that 

pollutant load among the various sources. If the pollutant comes from a discrete (point) source 

such as a municipal or industrial facility’s discharge pipe, that facility’s share of the loading 

capacity is called a wasteload allocation. If the pollutant comes from a set of diffuse (nonpoint) 

sources such as farm runoff, the cumulative share is called a load allocation. 

The goal of a TMDL is to achieve clean water. Ecology works with the local community to 

develop (1) a strategy to control the pollution and (2) a monitoring plan to assess effectiveness of 

the water quality improvement activities. 

The water quality study described in this report was conducted to aid in developing a TMDL for 

303(d) listed pesticides and PCBs in the Yakima River. Load and wasteload allocations for the 

chemicals of concern will be addressed in a separate TMDL Water Quality Improvement Report 

to EPA, to be prepared by the Ecology Water Quality Program at a later date. While this study 

provides information on waters throughout the watershed, the TMDL that will be derived from 

this report will focus on those waters of Washington State within the Yakima basin. 

Watershed Description 

The Yakima River flows 215 miles out of Keechelus Lake in the Cascade Mountains to the 

Columbia River near Richland, draining an area of 6,155 square miles (Figure ES-1). The major 

population centers are, in downstream order, Ellensburg (16,542), Yakima (79,480), Toppenish 

(9,000), Sunnyside (14,710), and West Richland (10,210). 

The upper Yakima basin includes the Kittitas Valley, an area around Ellensburg devoted 

primarily to hay, cereal crops, and irrigated pasture. The lower Yakima basin is the region 

downstream of the Naches River confluence at the city of Yakima. The lower Yakima Valley 

produces fruit, vegetables, grapes, other specialty crops such as hops and mint, dairy products, 

and beef. The lower Yakima basin is one of the most intensively irrigated and agriculturally 

diverse areas in the United States. Irrigation delivery is primarily managed by the U.S. Bureau 

of Reclamation. Diversions to the irrigation canals begin in mid-March and end in mid-October, 

depending on the water supply available and the district. 
Yakima Pesticides/PCBs TMDL: Vol 1, WQ Study Findings 

Page xvi 

Figure ES-1. Yakima River Basin. 

 
Yakima Pesticides/PCBs TMDL: Vol 1, WQ Study Findings 

Page xvii 

For many water quality parameters, the quality of irrigation return flows largely determines the 

quality of water in the lower Yakima River. Agricultural drains in the mid and lower valleys 

have been found to be significant sources of nutrients, suspended sediment, fecal coliform 

bacteria, and pesticides. The highest detection frequencies and concentrations of pesticides 

generally occur during irrigation season. Pesticides that persist in soil, such as DDT, continue to 

be transported in streams and drains throughout the year, especially during storm runoff or 

snowmelt. In 1993, the Washington State Department of Health (WDOH) issued an advisory 

that recommended limiting consumption of bottom fish from the lower Yakima River due to the 

high levels of the legacy pesticide DDT and its breakdown products DDE and DDD. 

Much of the land that lies to the south of the lower Yakima River is within the Yakama 

Reservation. The 1.2 million acre reservation occupies about 15% of the basin. A number of the 

tributaries and irrigation returns that enter the lower Yakima River flow through or originate on 

the reservation. 

Land within the Yakama Reservation is under the sovereign jurisdiction of the Yakama Nation. 

The Yakima River forms the reservation’s boundary from Ahtanum Creek in Union Gap to the 

Mabton-Sunnyside Bridge. Water quality scientists, technicians, and educators from the Yakama 

Nation, Ecology, U.S. Geological Survey (USGS), and other agencies have maintained a 

cooperative partnership to monitor conditions and promote appropriate water management 

practices. 

Yakima River 303(d) Listings 

The Yakima River, along with several of its tributaries and irrigation returns, are 303(d) listed 

for exceeding water quality standards for a range of chemical contaminants. The include six 

legacy pesticides or breakdown products (DDT, DDE, DDD, dieldrin, chlordane, and alphaBHC), two current-use insecticides (endosulfan and chlorpyrifos), polychlorinated biphenyls 

(PCBs), and dioxin (2,3,7,8-TCDD) (Table ES-1). Historical data collected by Ecology, USGS, 

and EPA have shown these pollutants exceed Washington State human health criteria for fish 

consumption or water quality criteria for protecting aquatic life. Washington’s human health 

criteria are adopted from the EPA National Toxics Rule and are intended to protect the average 

fish consumer among the general public. 

Most of these chemicals bioaccumulate in fish, wildlife, and humans. The DDT breakdown 

product DDE, PCBs, and dioxin, in particular, are highly bioaccumulative due to their stability 

and solubility in lipids (fat). Concentrations in fish tissues can be tens of thousands of times 

higher than in the surrounding water. 

DDT, dieldrin, chlordane, alpha-BHC, and PCBs are legacy pollutants no longer produced or 

used in the United States. PCBs had numerous industrial applications as insulating fluids, 

plasticizers, in inks, and carbonless paper, and as heat transfer and hydraulic fluids. Dioxin is an 

unintended by-product of combustion and certain industrial processes. EPA has classed these 

compounds as probable human carcinogens. Endosulfan and chlorpyrifos are currently approved 

for use as insecticides on a variety of crops. They have adverse human health and aquatic life 

effects but are not carcinogens. Their bioaccumulation potential is low. 
Yakima Pesticides/PCBs TMDL: Vol 1, WQ Study Findings 

Page xviii 

Table ES-1. 303(d) Listed Pollutants in the Yakima River Basin (2008 list). 

Pollutant 

Upper 

Yakima River 

(WRIA 39) 

Lower 

Yakima River 

(WRIA 37) 

Naches 

River† 

(WRIA 38) 

Pesticides 

DDT X 

DDE* X X 

DDD* X 

Dieldrin X 

Endosulfan X 

Chlordane X X 

Alpha-BHC X 

Chlorpyrifos X 

PCBs 

(polychlorinated biphenyls) X X X 

Dioxin (2,3,7,8-TCDD) X X 

*DDT breakdown product. 

WRIA = Water Resources Inventory Area. 

†listings are for Cowiche Creek. 

In addition to the toxic chemicals shown above, the Yakima River basin also has 303(d) listings 

for dissolved oxygen, pH, temperature, and fecal coliform bacteria. 

Existing TMDLs 

Two related TMDLs are already in place for the Yakima River. The Lower Yakima River 

Suspended Sediment and DDT TMDL was established in 1998. The Upper Yakima River 

Suspended Sediment and Organochlorine Pesticide TMDL was established in 2002. These 

TMDLs set numeric water quality targets to be achieved for DDT compounds, dieldrin, 

suspended sediment, and turbidity, and schedules for meeting the targets. 

The basic premise behind both TMDLs is that DDT and other pesticides attached to farm soils 

are being washed into the river at levels that adversely affect aquatic life and cause an increased 

health risk to people consuming fish. Suspended sediments – measured as total suspended solids 

(TSS) – also cause excessive turbidity. The combined effects of elevated TSS, turbidity, and 

pesticides degrade fish and wildlife habitat. Threatened and endangered salmonids are a 

particular concern. 

The present study builds on results of these efforts. While the Lower Yakima River TMDL was 

approved by EPA for meeting aquatic life criteria, it was not approved for achieving compliance 

with the more restrictive human health criteria. Therefore, the lower Yakima River remains 

303(d) listed for DDT compounds and dieldrin, in addition to other chemicals listed after the 

TMDL was completed. The Upper Yakima River TMDL was approved as a plan for meeting 

both aquatic life and human health criteria, and the listings for DDT compounds and dieldrin 
Yakima Pesticides/PCBs TMDL: Vol 1, WQ Study Findings 

Page xix 

were subsequently moved from Category 5 (TMDL required) to Category 4 (has an approved 

TMDL). 

2006 Fish Tissue Survey 

In view of the 303(d) listings, Ecology surveyed pesticide, PCB, and dioxin levels in resident 

fish species throughout the Yakima River in 2006. Fifty-six composite fillet samples and 30 

composite whole fish samples were analyzed from the Keechelus Lake storage reservoir to the 

mouth of the Yakima River, representing approximately 300 individual fish. 

Findings showed that the primary human health concerns for fish consumption in the Yakima 

River were the DDT breakdown product DDE, PCBs, dieldrin, and toxaphene, an unlisted legacy 

pesticide. Except for PCBs, the concern was primarily restricted to the lower river. The DDE, 

PCB, dieldrin, and toxaphene results are summarized in Figures ES-2 and ES-3. 

Although still not meeting water quality standards, the levels of DDT compounds and dieldrin in 

Yakima River fish had decreased substantially since the suspended sediment and pesticide 

TMDLs were first initiated. WDOH has concluded that the levels are now low enough to lift the 

1993 fish consumption advisory for DDT compounds. An advisory was retained to limit 

consumption of lower river carp due to PCBs. 

Figure ES-2. DDE and PCB Levels in Yakima River Fish Collected in 2006. 

0

20

40

60

80

100

120

0

100

200

300

400

500

600

Total PCBs (parts per billion)

DDE (parts per billion)

DDE PCBs

DDE human health criterion = 32 ppb

PCBhuman health criterion = 5.3 ppb
Yakima Pesticides/PCBs TMDL: Vol 1, WQ Study Findings 

Page xx 

 

Figure ES-3. Dieldrin and Toxaphene Levels in Yakima River Fish Collected in 2006.

2007-08 Water Quality Study 

Based on results of the 2006 fish survey, Ecology initiated a year-long water quality study in the 

Yakima River basin in 2007 to aid in developing a TMDL for the 303(d) listed pesticides, PCBs, 

and toxaphene. Dioxin was excluded from the study due to budget constraints and because the 

fish samples showed the human health criterion was met or very close to being met, depending 

on location. 

The sampling effort was weighted toward the lower Yakima River due to the greater number of 

303(d) listings and because of the existing TMDL for suspended sediment and pesticides in the 

upper river. The study analyzed 303(d) pesticides, PCBs, toxaphene, suspended sediment, and 

turbidity in surface waters, municipal wastewater treatment plant (WWTP) effluents, fruit packer 

and vegetable processor effluents (lower river only), and urban stormwater runoff. Chemical 

analysis for the upper river was limited to PCBs and toxaphene. Field work was initiated in 

April 2007 and completed in June 2008. Over 400 samples were analyzed. 

The present report describes how the water quality study was conducted and analyzes the data in 

terms of compliance with water quality criteria, temporal and seasonal patterns, trends, pollutant 

loading, and relative importance of sources. Examples are provided of significant water quality 

improvements already realized due to farmers reducing soil erosion and associated pesticide 

inputs to surface waters to meet TMDL water quality targets. 

0

10

20

30

40

50

60

0.0

0.5

1.0

1.5

2.0

2.5

3.0

Toxaphene (parts per billion)

Dieldrin (parts per billion)

Dieldrin Toxaphene

Dieldrin human health criterion = 0.65 ppb

Toxaphene human health criterion = 9.6 ppb
Yakima Pesticides/PCBs TMDL: Vol 1, WQ Study Findings 

Page xxi 

Water Quality Study Findings 

Key findings of the water quality study include the following: 

 Despite significant, recent reductions in soil erosion, lower Yakima River irrigation returns 

continue to discharge elevated levels of suspended sediment that contribute to exceedances of 

turbidity and pesticide criteria and TMDL targets, particularly during the first half of the 

irrigation season. Figure ES-4 shows turbidity levels during the 2007 irrigation season in the 

lower mainstem compared to the existing TMDL target. 

Figure ES-4. Turbidity in the Lower Mainstem Yakima River during the 2007 Irrigation 

Season. 

 Although much reduced over historical levels, the lower Yakima River and a number of its 

tributaries and irrigation returns still exceed human health or aquatic life criteria for DDT, 

DDT breakdown products, and dieldrin (Figure ES-5). 

 A first-time effort to characterize chemical contaminants in urban stormwater discharges to 

the Yakima River found high levels of pesticides, PCBs, TSS, and turbidity in runoff from 

the cities of Yakima, Union Gap, and Ellensburg (pesticides not analyzed in Ellensburg 

samples) (Figure ES-6). 

 Several irrigation returns to the lower Yakima River exceed human health or aquatic life 

criteria for toxaphene and PCBs. Exceedances of the toxaphene aquatic life criteria were 

observed in the lower Yakima mainstem during the irrigation season. 

 Peak chlorpyrifos concentrations in some of the same returns exceed aquatic life criteria 

during the spring and fall when this insecticide is being applied. 

0

5

10

15

20

25

30

35

Turbidity Units (NTU)

TMDL Target

Euclid

Kiona

Parker

Irrigation Season
Yakima Pesticides/PCBs TMDL: Vol 1, WQ Study Findings 

Page xxii 

Figure ES-5. Lower Yakima River Tributaries and Irrigation Returns that Exceeded Water 

Quality Criteria for DDT Compounds and Dieldrin in 2007-08. 

Figure ES-6. Comparison of Pesticide and PCB Levels in Surface Water and Permitted 

Discharges (median values, log scale). 

0.01

0.1

1

10

Parts per trillion

Yakima Area 

Stormwater

Major Returns

Other Tribs & Returns

Fruit & Vegetable

WWTPs

Mainstem & Naches R.
Yakima Pesticides/PCBs TMDL: Vol 1, WQ Study Findings 

Page xxiii 

In terms of loading, irrigation returns continue to be the predominant cause of degraded water 

quality in the lower Yakima River. These are the most significant sources needing control to 

reduce the adverse effects of elevated turbidity, pesticides, and PCBs. Urban stormwater runoff 

appears to be a significant source of these same pollutants and warrants additional monitoring of 

spatial and temporal variability to better identify and control sources. 

This study found that reductions are also needed for PCBs in WWTP effluents and dieldrin in 

fruit packer and vegetable processor effluents, if they are to meet water quality criteria at the 

point of discharge. However, these are relatively low volume discharges. Due to chemical 

interferences, legacy pesticides could not be analyzed down to water quality criteria levels in 

WWTP effluent. 

Pollutants for Which a TMDL or Other Pollution Control Plan 

is Needed 

The combined results from Ecology’s fish tissue and water quality studies show that DDT 

compounds, dieldrin, chlordane, chlorpyrifos, toxaphene, and PCBs currently exceed standards 

in the Yakima River basin at the locations indicated in Table ES-2. Thus, 303(d) listing 

continues to be warranted for these pollutants, and a TMDL or other pollution control plan 

should be implemented. Dioxin marginally exceeds standards and should therefore continue to 

be listed. The chlordane exceedance is also marginal and limited to fish near Prosser. 

Table ES-2. Locations and Pollutants Where a TMDL or Other Pollution Control Plan is 

Needed. 

Reservoirs 

(WRIA 39) 

Upper Yakima River 

(WRIA 39) 

Lower Yakima River 

(WRIA 37) 

Naches River 

(WRIA 38) 

Keechelus Lake 

Kachess Lake Mainstem Wilson Creek Mainstem Tributaries & Returns Mainstem Cowiche Creek 

PCBs PCBs Toxaphene* PCBs PCBs PCBs PCBs 

Dioxin Toxaphene* Toxaphene* DDE 

DDE DDE Total DDT 

Total DDT† DDT 

Dieldrin Total DDT 

Dioxin Chlorpyrifos 

WRIA = Water Resources Inventory Area. 

*new finding, not currently 303(d) listed. 

†

total DDT = DDT+DDE+DDD. 

The low-level occurrence of PCBs is widespread in Washington rivers and lakes, and is the 

reason for many 303(d) listings. Targeted cleanups of PCB contaminated sites may be more 

effective for reducing PCB levels in the Yakima River than the traditional TMDL approach of 

setting load and wasteload allocations. 

 
Yakima Pesticides/PCBs TMDL: Vol 1, WQ Study Findings 

Page xxiv 

Because of limited Ecology resources, which extend beyond costs and include staffing levels, 

dioxin will not be included in this TMDL. Dioxin will remain on the 303(d) list of contaminants 

to be addressed in the Yakima basin in the future. Ecology plans to address dioxins on a larger 

scale (possibly region- or state-wide) in the future. Additionally, because dioxins are often 

carried via air and can pollute sizeable areas not necessarily limited to watersheds, a larger 

TMDL footprint will likely be more effective and efficient. 

Numeric TMDL Targets and Loading Capacity 

This report proposes numeric water quality targets for the TMDL. The targets identify the 

specific instream goals or criteria for the TMDL, which equate to attainment of water quality 

standards. The targets include: (1) a partial revision to the existing TMDL turbidity targets for 

the lower Yakima River; (2) a subset of the water quality criteria for pesticides and PCBs; and 

(3) equivalent human health criteria-based targets for edible fish tissue. Similar targets for 

pesticides and turbidity are already in effect as part of the Upper Yakima River TMDL. 

The loading capacity (grams per day) of the Yakima River was calculated for total DDT, DDE, 

dieldrin, chlordane, chlorpyrifos, toxaphene, and PCBs. Reductions in the concentrations and 

loads of these compounds will be needed to meet the water quality targets and not exceed 

loading capacity. 

Recommendations 

The report concludes with recommendations for the TMDL, 303(d) list, source tracing, and 

further monitoring. These include: 

 Develop TMDLs or other pollution control plans for DDT compounds, dieldrin, chlordane, 

chlorpyrifos, toxaphene, and PCBs for those areas indicated in Table ES-2. 

 Remove the 303(d) listings for endosulfan, chlordane (upper Yakima River only), alphaBHC, and dioxin (Keechelus Reservoir only). 

 Improve current understanding of variability in concentrations and loads of pesticides, PCBs, 

suspended solids, and turbidity in Yakima area urban stormwater runoff, with the ultimate 

aim of identifying and controlling sources. 

 Identify sources of toxaphene and PCBs in selected irrigation returns. 

 Characterize dry weather discharge of pesticides, PCBs, suspended solids, and turbidity from 

Yakima area urban storm drains. 

 Continue turbidity monitoring of irrigation returns and expand where appropriate. 

 Periodically monitor Yakima River fish for the contaminants of concern to assess progress 

toward meeting human health criteria and TMDL targets. 
Yakima Pesticides/PCBs TMDL: Vol 1, WQ Study Findings 

Page 1 

What is a Total Maximum Daily Load (TMDL)? 

Federal Clean Water Act Requirements 

The Clean Water Act established a process to identify and clean up polluted waters. Under the 

Act, each state is required to have its own water quality standards designed to protect, restore, 

and preserve water quality. Water quality standards consist of designated uses for protection, 

such as cold water biota and drinking water supply, as well as criteria, usually numeric criteria, 

to achieve those uses. 

Every two years, states are required to prepare a list of waterbodies – lakes, rivers, streams, or 

marine waters – that do not meet water quality standards. This list is called the 303(d) list. To 

develop the list, the Washington State Department of Ecology (Ecology) compiles its own water 

quality data along with data submitted by local, state, and federal governments, tribes, industries, 

and citizen monitoring groups. All data are reviewed to ensure that they were collected using 

appropriate scientific methods before being used to develop the 303(d) list. The 303(d) list is 

part of the larger Water Quality Assessment. 

The Water Quality Assessment is a list that tells a more complete story about the condition of 

Washington’s water. This list divides waterbodies into five categories: 

Category 1 – Meets standards for parameter(s) for which it has been tested. 

Category 2 – Waters of concern. 

Category 3 – Waters with no data available. 

Category 4 – Polluted waters that do not require a TMDL because: 

4a. Has an approved TMDL and it is being implemented. 

4b. Has a pollution control plan in place that should solve the problem. 

4c. Is impaired by a non-pollutant such as low water flow, dams, culverts. 

Category 5 – Polluted waters that require a TMDL – the 303(d) list. 

TMDL Process Overview 

The Clean Water Act requires that a TMDL be developed for each of the waterbodies on the 

303(d) list. A TMDL identifies how much pollution needs to be reduced or eliminated to 

achieve clean water. Ecology then works with the local community to develop (1) a strategy to 

control the pollution and (2) a monitoring plan to assess effectiveness of the water quality 

improvement activities. TMDLs must be approved by EPA. 
Yakima Pesticides/PCBs TMDL: Vol 1, WQ Study Findings 

Page 2 

Elements Required in a TMDL 

The goal of a TMDL is to ensure the impaired water will attain water quality standards. A 

TMDL includes a written, quantitative assessment of water quality problems and pollutant 

sources that cause the problem. The TMDL determines the amount of a given pollutant that can 

be discharged to the waterbody and still meet standards (the loading capacity) and allocates that 

load among the various sources. 

Identification of a waterbody’s loading capacity for a pollutant is an important step in developing 

a TMDL. EPA defines loading capacity as “the greatest amount of loading that a waterbody can 

receive without violating water quality standards” (www.epa.gov/owow/tmdl/glossary.html). 

The loading capacity provides a reference for calculating the amount of pollution reduction 

needed to bring a waterbody into compliance with standards. By definition, a TMDL is the sum 

of the allocations, which must not exceed the loading capacity. 

The portion of the receiving water’s loading capacity assigned to a particular source is a load or 

wasteload allocation. If the pollutant comes from a discrete (point) source such as a municipal 

or industrial facility’s discharge pipe, that facility’s share of the loading capacity is called a 

wasteload allocation. If the pollutant comes from a set of diffuse (nonpoint) sources such as 

farm runoff, the cumulative share is called a load allocation. 

The TMDL must also consider seasonal variations and include a margin of safety that takes into 

account any lack of knowledge about the causes of the water quality problem or its loading 

capacity. A reserve capacity for future loads from growth pressures is sometimes included as 

well. The sum of the wasteload and load allocations, the margin of safety, and any reserve 

capacity must be equal to or less than the loading capacity. 

TMDL = Loading Capacity = sum of all wasteload allocations + sum of all load allocations + 

margin of safety. 
Yakima Pesticides/PCBs TMDL: Vol 1, WQ Study Findings 

Page 3 

Why is Ecology Conducting a TMDL Study 

in This Watershed? 

Overview 

This TMDL project will incorporate and update the DDT and suspended sediments water quality 

improvement plans already in place in the Yakima basin, while capturing previously unaddressed 

water quality impairments due to other toxics pollutants. While this study provides information 

on waters throughout the watershed, the TMDL derived from this report will focus on those 

waters of Washington State within the Yakima basin. 

In 1994 Ecology began to seriously address polluted runoff in the Yakima River watershed when 

it initiated the Yakima River Suspended Sediment and DDT TMDL study. That project concluded 

that reducing polluted runoff from irrigated agricultural activities was a priority for reducing 

DDT and its breakdown products. The 1997 publication of the TMDL included goals for 

controlling sediment runoff reaching the Yakima River through irrigation drains and a schedule 

for re-evaluating contaminant loading to the river. 

An Ecology TMDL study in the upper Yakima River conducted in 1999 also showed that DDT, 

its breakdown products, and other organochlorine pesticides could be reduced if suspended 

sediment loading from agricultural areas were reduced. 

The current study answers the TMDL requirement to check the progress of the earlier work on 

suspended sediments and DDT while expanding the study to capture other toxics in the 

watershed. 

After a decade of implementation activities that reduce suspended sediment loading to the 

Yakima River and its tributaries, Ecology began this study to: 

 Assess progress toward meeting TMDL targets for reducing DDT and dieldrin levels in 

Yakima River fish. 

 Verify accuracy of the current 303(d) listings for chemical contaminants in Yakima River 

fish and water. 

 Provide data to the Washington State Department of Health to update the 1993 fish 

consumption advisory on DDT. 

 Set or adjust pollution reduction goals from a broad range of sources – stormwater, irrigated 

agriculture, wastewater treatment plants, and other sources – for meeting human health and 

aquatic life criteria for toxic compounds in the Yakima River. 

Due to the size of the Yakima basin and the number and complexity of toxics issues, Ecology 

decided to split the TMDL into two parts: a Water Quality Study Findings Report (the present 

study) and a future TMDL Water Quality Improvement Report. This Water Quality Study 

Findings Report assesses the current status of toxics pollution problems and sources in the 

Yakima basin and calculates the river’s loading capacity for the chemicals of concern. The 
Yakima Pesticides/PCBs TMDL: Vol 1, WQ Study Findings 

Page 4 

Water Quality Improvement Report will include the overall approach to control the pollution 

(Implementation Strategy) and a monitoring plan to assess the effectiveness of the water quality 

improvement activities undertaken (Effectiveness Monitoring). Load and wasteload allocations 

for the chemicals of concern will be addressed in the Water Quality Improvement Report, to be 

prepared by the Ecology Water Quality Program at a later date and submitted to EPA. 

Study Area 

The study area for this TMDL includes the Yakima River, its tributaries, and irrigation returns. 

This area extends from the headwaters of Keechelus Lake to the Yakima River confluence with 

the Columbia River. It includes Water Resource Inventory Areas (WRIA) 39: Upper Yakima 

River, WRIA 38: Naches River, and WRIA 37: Lower Yakima River (Figure 1). 

Figure 1. Water Resource Inventory Areas for Yakima River Pesticides and PCBs TMDL. 
Yakima Pesticides/PCBs TMDL: Vol 1, WQ Study Findings 

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Yakima Basin Waterbodies on Ecology’s 303(d) List of 

Impaired Waters 

Washington’s 2008 303(d) list includes numerous Category 5 listings in the Yakima River 

watershed for a range of chemical contaminants 

(www.ecy.wa.gov/programs/wq/303d/index.html). The include six legacy pesticides or 

breakdown products (DDT, DDE, DDD, dieldrin, chlordane, and alpha-BHC), two current use 

insecticides (endosulfan and chlorpyrifos), polychlorinated biphenyls (PCBs), and dioxin 

(2,3,7,8-TCDD). Waterbodies in Category 5 require a TMDL. 

The individual Category 5 listings for chemicals that have failed to meet (exceeded) human 

health criteria in edible fish tissue samples from the Yakima River are in Appendix A. The 

listings for chemicals that have exceeded human health and aquatic life criteria in water samples 

are in Appendix B. Both sets of listings are summarized in Table 1. Ninety-five percent of the 

current Category 5 listings in the Yakima basin are for the lower river (89 out of 94). 

Although EPA approved the Lower Yakima River Suspended Sediment and DDT TMDL for 

meeting aquatic life and turbidity criteria, it was not approved for achieving compliance with the 

more restrictive human health pesticide criteria. Therefore, the lower river continues to have 

Category 5 listings for DDT, DDE, DDD, and dieldrin. The Upper Yakima River Suspended 

Sediment and Organochlorine Pesticide TMDL was approved for meeting human health criteria, 

and the listings for DDT compounds and dieldrin were subsequently moved to Category 4a

(waterbodies that have an approved TMDL). 

The 2008 303(d) list had a number of new Yakima River listings for organochlorine compounds 

including PCBs, dioxin, and the pesticides endosulfan, chlorpyrifos, chlordane, and alpha-BHC. 

These listings were based on fish and water samples analyzed by Ecology and EPA since 1995. 

Most of these chemicals bioaccumulate in fish, wildlife, and humans. DDE, PCBs, and dioxin, 

in particular, are highly bioaccumulative due to their stability and solubility in lipids (fat). 

Concentrations in fish tissues, for example, can be tens of thousands of times higher than in the 

surrounding water. 

PCBs and most chlorinated pesticides are legacy pollutants no longer produced or used in the 

United States. They were banned by EPA in the 1970s and 1980s for ecological and human 

health concerns, but they persist in soil, lakes, rivers, and streams. Endosulfan, a chlorinated 

insecticide, and chlorpyrifos, an organophosphorus insecticide, are currently approved for a 

variety of crops. Their bioaccumulation potential is low. The 303(d) listings for endosulfan and 

chlorpyrifos are for exceeding aquatic life criteria in water samples. 

PCBs were once widely used in industrial applications as insulating fluids, plasticizers, in inks 

and carbonless paper, and as heat transfer and hydraulic fluids. Dioxin is an unintended byproduct of combustion and certain industrial processes. These chemicals are routinely detected 

in Washington rivers and streams and are the cause of many 303(d) listings. 

 
Yakima Pesticides/PCBs TMDL: Vol 1, WQ Study Findings 

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Table 1. Summary of 303(d) Listings for Chemical Contaminants in the Yakima River Basin 

(2008 list).

Reach 

Number 

of 

Listings 

Parameter Applies 

To 

Upper Yakima River (WRIA 39) 

Keechelus Lake 2 PCBs, Dioxin Fish tissue 

Yakima R. Canyon 3 PCBs, Dioxin, Chlordane Fish tissue 

Naches River (WRIA 38) 

Cowiche Creek 2 PCBs, DDE Fish tissue 

Lower Yakima River (WRIA 37) 

Yakima R. near Union Gap 5 DDT, DDE, DDD, alpha-BHC, PCBs Fish tissue 

7 DDT, DDE, DDD, Chlorpyrifos, Endosulfan Water 

Yakima R. near Zillah 3 DDT, DDD, Dieldrin Fish tissue 

Yakima R. near Granger 8 DDT, DDE, PCBs, Dioxin Fish tissue 

2 DDT, Dieldrin Water 

Yakima R. near Grandview 

1 DDE Fish tissue 

2 DDE, DDD Water 

Yakima R. near Prosser 4 DDT, DDE, Chlordane, Dioxin Fish tissue 

1 DDT Water 

Yakima R. near Benton City 8 DDT, DDE, DDD, alpha-BHC, PCBs Fish tissue 

5 DDT, DDE, DDD, Dieldrin, Endosulfan Water 

Yakima R. near Horn Rapids 6 

1 

DDT, DDE, DDD, Dieldrin, alpha-BHC, PCBs Fish tissue 

DDE Water 

Yakima R. near mouth 2 DDT, DDE Fish tissue 

Yakima Tributaries: 

Wide Hollow Creek, Moxee 

Drain, Marion Drain, Granger 

Drain, Sulphur Creek 

Wasteway, Snipes Creek, 

Spring Creek

32 DDT, DDE, DDD, Dieldrin, Endosulfan, 

Chlorpyrifos Water 

44 Total Fish Tissue Listings 

50 Total Water Column Listings 

 94 Total Listings 

*Water Resources Inventory Area. 

 
Yakima Pesticides/PCBs TMDL: Vol 1, WQ Study Findings 

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Toxaphene, a chlorinated pesticide, is among the pollutants being addressed in this TMDL. 

All uses of this chemical were banned in 1990. Toxaphene is not currently 303(d) listed but was 

recently identified as a contaminant of potential concern in Yakima River fish (Johnson et al., 

2007). The report of this finding did not come in time for the 2008 303(d) list. Toxaphene 

shares many of the characteristics of other bioaccumulative pesticides and PCBs. 

Detailed profiles including use, regulations, environmental occurrence, and health effects of 

these chemicals have been prepared by the Agency for Toxic Substances & Disease Registry and 

are available at www.atsdr.cdc.gov/toxpro2.html. 

In addition to the toxic chemicals mentioned above, the Yakima River basin has 303(d) listings 

for dissolved oxygen, pH, temperature, and fecal coliform bacteria. 

Pollutants Addressed by This TMDL 

This TMDL project addresses the pollutants listed in Table 2. 

Table 2. Pollutants Being Addressed in This TMDL. 

Pollutant 

Upper 

Yakima Basin 

(WRIA 39) 

Lower 

Yakima Basin 

(WRIA 37) 

Naches River 

(WRIA 38) 

Chlorinated Pesticides 

DDT (dichlorodiphenyltrichloroethane) X 

DDE (dichlorodiphenyldichloroethylene)* X X 

DDD (dichlorodiphenyldichloroethane)* X 

Dieldrin X 

Endosulfan X 

Chlordane X X 

Alpha-BHC (benzenehexachloride) X 

Toxaphene† X X 

Organophosphorus Pesticides 

Chlorpyrifos X 

PCBs (polychlorinated biphenyls) X X X 

*DDT breakdown product. 

†Not currently 303(d) listed. 

Suspended sediment and turbidity are also a focus of this study. The previous TMDLs correlated 

these parameters with the occurrence of chlorinated pesticides and adverse effects on fish and 

other aquatic life. The TMDLs established numeric water quality targets and schedules to bring 

the Yakima River into compliance with the turbidity standards and certain of the pesticide 

criteria. 

 
Yakima Pesticides/PCBs TMDL: Vol 1, WQ Study Findings 

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Washington State standards do not provide numeric criteria for suspended sediment. However, 

elevated levels of suspended sediment increase turbidity, and turbidity is addressed in the 

standards. 

Exceedances of dioxin criteria in the Yakima River are minimal. For this reason and because of 

limited Ecology resources, which extend beyond costs and include staffing levels, dioxin will 

not be addressed in this TMDL. Dioxin will remain on the 303(d) list of contaminants to be 

addressed in the Yakima basin in the future. Ecology plans to address dioxins on a larger scale, 

possibly region- or state-wide. Because dioxins are often carried via air and can pollute sizeable 

areas not necessarily limited to watersheds, a larger TMDL footprint will likely be more 

effective and efficient. 
Yakima Pesticides/PCBs TMDL: Vol 1, WQ Study Findings 

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 Water Quality Standards 

Designated Uses 

Designated uses in Washington State include public water supply, protection for fish, shellfish, 

and wildlife, as well as recreational, agricultural, industrial, navigational, and aesthetic purposes. 

Water quality criteria are designed to protect the designated uses and are used to assess the 

general health of Washington surface waters and set permit limits. 

Use designations for the upper Yakima River, lower Yakima River, Naches River, and their 

tributaries are listed in Appendix C. 

Toxics 

Washington State’s aquatic life and human health criteria for the toxic pollutants being addressed 

in this TMDL are shown in Table 3. 

Table 3. Washington State Water Quality Criteria for 303(d) Listed Pesticides, PCBs, and 

Toxaphene in the Yakima River Basin (ng/L; parts per trillion). 

Chemical 

Criteria for Protection Criteria for Protection 

of Aquatic Life 

(WAC 173-201A) 

of Human Health 

(EPA National Toxics Rule) 

Freshwater Freshwater Fish Fish & Water 

Chronic Acute Consumption Consumption 

DDT - - - - 0.59 0.59 

DDE - - - - 0.59 0.59 

DDD - - - - 0.84 0.83 

DDT and 

metabolites* 1.0 1,100 - - - - 

Dieldrin 1.9 2,500 0.14 0.14 

Chlordane 4.3 2,400 0.59 0.57 

alpha-BHC - - - - 13 3.9 

Endosulfan 56 220 2,000 930 

Chlorpyrifos 41 83 - - - - 

Toxaphene 0.2 730 0.75 0.73 

PCBs 14 2,000 0.17 0.17 

*The sum of DDT and metabolites DDE and DDD (i.e., total DDT). 

 - - = no criteria. 

 
Yakima Pesticides/PCBs TMDL: Vol 1, WQ Study Findings 

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Aquatic Life 

The aquatic life criteria are designed to protect for both short term (acute) and long term 

(chronic) effects of chemical exposure. The criteria are primarily intended to avoid direct 

lethality to fish and other aquatic life within the specified exposure periods. The chronic criteria 

for PCBs and a number of the chlorinated pesticides are to protect fish-eating wildlife from 

adverse effects due to bioaccumulation. 

The exposure periods assigned to the acute criteria are expressed as: (1) an instantaneous 

concentration not to be exceeded at any time, or (2) a 1-hour average concentration not to be 

exceeded more than once every three years on the average. The exposure periods for the chronic 

criteria are either: (1) a 24-hour average not to be exceeded at any time, or (2) a 4-day average 

concentration not to be exceeded more than once every three years on the average. For 303(d) 

listing purposes, measurements of instantaneous concentrations are assumed to represent the 

averaging periods specified in the water quality standards for both acute and chronic criteria, 

unless additional measurements are available to calculate averages (Ecology, 2006). 

As indicated in Table 3, there are no aquatic life criteria specifically for DDT, its breakdown 

products DDE and DDE, or alpha-BHC. The “DDT and metabolites” criteria apply to DDT, 

DDE, and DDD individually or in combination. In the present report, the sum of detected 

concentrations of DDT, DDE, and DDD is referred to as total DDT. 

Human Health 

Criteria for the protection of human health are applied to the states through the EPA National 

Toxics Rule (NTR) (40 CFR 131.36(14). In freshwater, the criteria take into account the 

combined exposure of drinking the water and eating fish that live in the water. In marine waters, 

human health criteria only consider the effect of eating fish. The criteria protect against noncarcinogenic illness and keep the risk of developing cancer to a pre-specified level. 

In Washington, the cancer risk is set such that no more than 1 in 1,000,000 people with full 

exposure would be likely to develop cancer in response to that exposure. Full exposure is 

defined by a set of assumptions on body weight, fish and water consumption, and the number of 

years exposed. The risk is correlated to an average-weight adult consuming 6.5 grams per day of 

fish (approximately 5 pounds per year), drinking 2 liters of water per day (if freshwater), and 

continuing this pattern for 70 years. For the chemicals of concern in the Yakima River, 

essentially all of the cancer risk is from fish consumption. People with higher or lower body 

weight and exposure patterns would face higher or lower risks. This basic exposure pattern is 

the same for both cancer-causing and non-cancer-causing chemicals. 

EPA has classed the pollutants of concern in this TMDL as probable human carcinogens, except 

for endosulfan and chlorpyrifos. The human health criteria for endosulfan are based on a 

reference dose that is unlikely to have appreciable health risk. There are no human health 

criteria for chlorpyrifos. 
Yakima Pesticides/PCBs TMDL: Vol 1, WQ Study Findings 

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The edible fish tissue criteria that apply to the Yakima River are shown in Table 4. These values 

are derived from the human health water quality criteria in Table 3 (fish and water consumption) 

and EPA bioconcentration factors (BCFs). BCF= Ct/Cw, where Ct is the contaminant 

concentration in fish tissue (wet weight) and Cw is the concentration in water. The BCFs are 

taken from the EPA 1980 Ambient Water Quality Criteria documents 

(www.epa.gov/waterscience/criteria/1980docs.htm). The BCF predicts the chemical 

concentration in fish tissue that would be expected to result for a given concentration in the water 

column. In essence, the 303(d) fish tissue criteria are the human health water quality criteria 

expressed in tissue form. 

Table 4. Freshwater Edible Fish Tissue Criteria for 303(d) Listed Pesticides, Toxaphene, PCBs, 

and Dioxin in Yakima River Fish (based on EPA National Toxics Rule; ug/Kg wet weight, parts 

per billion).

Chemical Fish Tissue 

Criteria 

DDT 32 

DDE 32 

DDD 45 

Dieldrin 0.65 

Chlordane 8.0 

alpha-BHC 0.51 

Endosulfan 251 

Chlorpyrifos - - 

Toxaphene 9.6 

PCBs 5.3 

Dioxin 0.00007 

Turbidity 

Turbidity is a measure of light refraction in water and can be used to estimate the amount of 

suspended sediment and other solids. Fish and other aquatic life are affected by suspended 

matter in the water column and sediments that settle out on the bottom. 

The effects of suspended sediment on fish and other aquatic life can be divided into five 

categories: 

1. Acting directly on swimming ability. 

2. Causing mortality or reducing their growth rate, resistance to disease, etc. 

3. Preventing the successful development of eggs and larvae. 

4. Modifying natural movements and migrations. 

5. Reducing the abundance of available food. 

 
Yakima Pesticides/PCBs TMDL: Vol 1, WQ Study Findings 

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Suspended sediment may also serve to transmit attached chemical and biological contaminants 

to waterbodies where they can be taken up in the tissues of fish. This can affect the health of 

humans or wildlife that eat the fish. Turbid waters also interfere with the treatment and use of 

water as potable water supplies, and can interfere with the recreational use and aesthetic 

enjoyment of the water. 

Turbidity is a focus of the existing Yakima River suspended sediment TMDLs. The criteria state 

that: Turbidity shall not exceed 5 NTUa

 over background turbidity when the background 

turbidity is 50 NTU or less, or have more than a 10 % increase in turbidity when the background 

is more than 50 NTU. The criteria do not set a maximum acceptable turbidity level based on 

beneficial use considerations, but they do limit the effect of an identified source on raising the 

turbidity in the receiving water. Background conditions are defined as ... the biological, 

chemical, and physical conditions of the water body, outside the area of influence of the 

discharge under consideration. [WAC 173-201A-200; 2006 edition] 

 

a

 nephelometric turbidity units 
Yakima Pesticides/PCBs TMDL: Vol 1, WQ Study Findings 

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Watershed Description 

Yakima River Basin 

The Yakima River flows 215 miles out of Keechelus Lake in the Cascade Mountains to the 

Columbia River near Richland, draining an area of 6,155 square miles (Figure 2). The major 

population centers are, in downstream order, Ellensburg (16,542), Yakima (79,480), Toppenish 

(9,000), Sunnyside (14,710), and West Richland (10,210). Much of the land that lies to the south 

of the lower Yakima River is within the Yakama Nation Reservation. The reservation occupies 

about 15% of the basin. 

Most of the Yakima basin is in the Cascade rain shadow. Mean annual precipitation ranges from 

140 inches in the mountains to less than 10 inches in the eastern regions. The western part is 

mostly forested, while the eastern uplands are dominated by sagebrush and grass. The lowlands 

are farmed and intensively irrigated. 

The upper basin includes the Kittitas Valley, an area around Ellensburg devoted primarily to hay, 

cereal crops, and irrigated pasture. The lower basin is downstream of the Naches River 

confluence at river mile (r.m.) 116.3 in the city of Yakima. The lower Yakima Valley produces 

fruit, vegetables, grapes, other specialty crops such as hops and mint, dairy products, and beef. 

The lower Yakima River basin is one of the most intensively irrigated and agriculturally diverse 

areas in the United States. 

The Kittitas and Yakima Valleys are separated by the Yakima River Canyon, an arid 20-mile 

reach between Ellensburg and Yakima. The canyon is generally considered to be part of the 

upper Yakima River. 

Approximately one-half million acres are irrigated in the drainage. Most of the water is managed 

by the U.S. Bureau of Reclamation (USBR). Snowmelt and precipitation are held in six 

reservoirs on the upper Yakima and Naches Rivers and delivered to growers via rivers, creeks, 

and man-made canals. Water distribution from canals to farms is primarily managed by 

irrigation districts. USBR also manages the system for flood control, power generation, and 

fishery management. 

Irrigation is by one of three general methods: furrow, sprinkler, or drip. Of these methods, 

furrow typically results in the most surface runoff from agricultural lands. Excess water is 

collected at the lower ends of fields and flows into drains that ultimately reach the Yakima River. 

Over the last several decades, irrigated land has been converted to sprinkler or drip irrigation, 

but rill and furrow is still used by many agricultural producers. 
Yakima Pesticides/PCBs TMDL: Vol 1, WQ Study Findings 

Page 14 

Figure 2. Yakima River Basin. 

 
Yakima Pesticides/PCBs TMDL: Vol 1, WQ Study Findings 

Page 15 

During the summer, return flows downstream from the city of Yakima account for 50 to 

70% of the flow in the Yakima River (Fuhrer et al., 2004). Thus, for many water quality 

parameters, the quality of the irrigation returns largely determines the quality of water in the 

lower Yakima River. While most of the drinking water in the Yakima basin comes from wells, 

surface water provides drinking water for some cities such as Yakima (Naches River) and 

Cle Elum (upper Yakima River). 

Yakama Nation 

The 1.2-million-acre Yakama Reservation lies between the lower Yakima River and the Cascade 

Range. A number of the tributaries and irrigation returns that enter the Yakima River flow 

through or originate on the reservation. 

Land within the Yakama Reservation is under the sovereign jurisdiction of the Yakama Nation. 

The Yakima River forms the reservation’s northern boundary from Ahtanum Creek at r.m. 106.9 

in Union Gap to the Mabton-Sunnyside Bridge at r.m. 59.8. 

Since the Yakima River was on the 303(d) list of threatened or impaired waterbodies, the state 

acted to improve and protect water quality by developing the existing TMDLs. Water quality 

scientists, technicians, and educators from the Yakama Nation, Ecology, the U.S. Geological 

Survey (USGS), and other agencies have maintained a cooperative partnership to monitor 

conditions and promote appropriate water management practices. The approval and cooperation 

of the Yakama Nation is important to the success of continuing efforts to clean up the river. 

Streamflow and the Irrigation System 

Peak runoff in the Yakima River normally occurs during snowmelt in April and May (Figure 3). 

Diversions to the irrigation canals begin in mid-March and end in mid-October, depending on 

water supply. Because of diversions, flow regulation in the headwaters, and dry summers, some 

reaches of the Yakima have a low-flow period during summer. Most irrigation returns have their 

low-flow periods in the winter, while many natural tributaries have low-flow periods in the late 

summer or fall. 

Streamflow varies from year to year depending on snowfall. The snowpack is thought of as the 

"sixth reservoir" and is an integral part of the total water supply. "Storage control" is a term used 

to define the time when natural, unregulated flow in the river has ended and water supply is 

controlled by releases from the reservoirs. In a year with normal snowmelt and runoff, the 

system goes on storage control around June 20. 

There are seven divisions in the USBR Yakima Project: Storage, Kittitas, Tieton, Roza, Wapato, 

Sunnyside, and Kennewick. The Wapato Division is operated by the Bureau of Indian Affairs. 

Storage dams and reservoirs in the project are Keechelus, Kachess, and Cle Elum on the upper 

Yakima River, and Bumping Lake, Clear Lake, and Tieton Reservoir (Rimrock Lake) in the 

Naches River drainage. Other project features are five diversion dams, canals, laterals, pumping 

plants, drains, two power plants, and transmission lines. 
Yakima Pesticides/PCBs TMDL: Vol 1, WQ Study Findings 

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Figure 3. Monthly Average Flow in the Yakima River, Sulphur Creek Wasteway, and Granger 

Drain. 

(USGS data: Yakima @ Umtanum 1933-1977; Yakima @ Kiona 1933-2007; Sulphur Creek 

1976-90; Granger Drain 1991-2003; http://waterdata.usgs.gov/wa/nwis/sw.) 

 

0

50

100

150

200

250

300

350

0

1000

2000

3000

4000

5000

6000

Irrigation Returns (cfs)

Mainstem (cfs)

Yakima @ Kiona Yakima @ Umtanum

Sulphur Creek Wasteway Granger Drain
Yakima Pesticides/PCBs TMDL: Vol 1, WQ Study Findings 

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Figure 4 is a schematic of the drainage, showing the relative position of selected tributaries, 

diversions, return flows, and other features of interest in the present study. 

Figure 4. Relative Position of Selected Tributaries, Diversions, Irrigation Returns, and Other 

Features on the Yakima River. 

 

Feature Inflow or Outflow River 

Mile 

Keechelus Lake 214.5 

Kachess Lake 203.5 

Cle Elum Lake 185.6 

Wilson Creek 147.0 

Umtanum Stream-gaging Station ‐‐ 140.5 

Roza Diversion Dam 127.9 

Naches River 116.3 

Roza Power Return 113.3 

Wide Hollow Creek 107.4 

Moxee Drain 107.3 

Ahtanum Creek 106.9 

Wapato Canal 106.7 

Sunnyside Diversion Dam 103.8 

Parker Stream-gaging Station ‐‐ 103.7 

Marion Drain 83.2 

Granger Drain 82.8 

Toppenish Creek 80.4 

Satus Creek 69.6 

Sulphur Creek Wasteway 61.0 

Euclid Stream-gaging Station ‐‐ 55.0 

Chandler Diversion Dam @ Prosser 47.2 

Spring Creek/Snipes Creek 41.8 

Chandler Power Return 35.8 

Kiona Stream-gaging Station ‐‐ 29.9 

Horn Rapids Diversion Dam 18.0 

Columbia River Confluence ‐‐ 0 
Yakima Pesticides/PCBs TMDL: Vol 1, WQ Study Findings 

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Four hydrologic points of particular importanceb are: 

1. Roza Diversion Dam (r.m. 127.9) 

Located at the bottom of the Yakima River Canyon about 10 miles north of the city of Yakima, 

the Roza Diversion serves approximately 72,500 acres of irrigated land on the northeast side 

of the lower valley. About half of the water diverted to Roza Canal is used for hydropower 

generation and returned to the river with little change in pollutant loading at r.m. 113.3 in 

Yakima. 

2. Naches River Confluence (r.m. 116.3) 

The Naches River is a major tributary to the lower Yakima River. It meets the Yakima about 

12 miles downstream of Roza Dam in Yakima. There are several major tributaries and irrigation 

returns in the reach between the Naches confluence and Union Gap including Wide Hollow 

Creek, Ahtanum Creek, and Moxee Drain. 

 

The Naches River supplies fairly high-quality water. Since 1981, the contribution of the Naches 

and Yakima Rivers to the lower basin has been manipulated during the irrigation season to 

accommodate the needs of irrigators and fishery managers. In general, upper Yakima River 

reservoirs are used to meet June to August irrigation needs, while Naches River reservoirs are 

used for September and October. The “flip-flop” allows flow regimes in the upper Yakima River 

for spring chinook salmon egg survival. 

3. Wapato and Sunnyside Valley District Diversions (r.m. 103.8 and 106.7) 

Located near Parker (r.m. 103.7), these two irrigation districts divert half to three-fourths of the 

water available below the city of Yakima. The Wapato Irrigation Project diverts up to 2,000 

cubic feet per second (cfs) to serve 136,000 acres of irrigated land on the Yakama Reservation. 

The Sunnyside Valley Irrigation District (SVID) diverts up to 1,280 cfs to serve 103,500 acres 

between the river and Roza Irrigation District lands. 

In many past years, nearly all of the water in the Yakima River mainstem was diverted for 

irrigation by the time it passed the SVID diversion, leaving the reach immediately downstream 

dewatered and nearly dry. This became a concern among fishery and water resource managers. 

Instream flow limits were established in 1994, setting a minimum target of 300 cfs that would 

remain in the river and maintain flow through fish ladders and around irrigation diversions. 

The remaining 103 miles of Yakima River in the lower basin slowly recover some of the water 

diverted for irrigation through surface and subsurface returns. The most numerous and largest 

tributaries and irrigation returns are located between Parker and the Euclid streamflow gauge 

near Grandview (r.m. 55.0). Major inflows to this reach are: Granger Drain, Marion Drain, 

Toppenish Creek, Satus Creek, and Sulphur Creek Wasteway. One additional large return, 

Spring Creek, is located downstream of Euclid below Prosser. 

 

b

 This information taken from Joy and Patterson (1997), USBR Hydromet website 

www.usbr.gov/dataweb/html/yakima.html, Coffin et al. (2006), and Morace et al. (1999). 
Yakima Pesticides/PCBs TMDL: Vol 1, WQ Study Findings 

Page 19 

Chandler Diversion is a significant control point at Prosser. It creates the Prosser pool, a major 

change point in river morphology and hydrology. The Chandler Power Return is a large input of 

water between Spring Creek and Kiona. 

4. Kiona (r.m. 29.9) 

There is a long-term stream-gaging station at Kiona (Benton City). Upstream of this point, the 

majority of the large irrigation diversions and returns have occurred. 

The Yakima River from Kiona to the mouth has a few additional diversions and returns, but no 

gaging station is located in the final 30-mile reach. The Columbia and Richland Canals are the 

most significant diversions. They occur at Horn Rapids (Wanawish) Dam (r.m. 18.0). The last 

significant irrigation return is Amon Wasteway at r.m. 2.1. 

Previous Water Quality Studies 

Yakima River water quality was investigated in the 1970s, with several studies evaluating 

sediment loading (CH2M Hill, 1975; Boucher, 1975; Soil Conservation Service, 1978; Corps 

of Engineers, 1978; Ecology, 1979; Nelson, 1979; Boucher and Fretwell, 1982; and Molenaar, 

1985). This work showed irrigation practices directly affected suspended sediment in the river. 

Peak concentrations occurred in April through June when streamflows were high and freshly 

tilled fields were being irrigated. Suspended sediment loads began to increase rapidly below the 

confluence of Moxee Drain (r.m. 107), a major irrigation return in Union Gap near Yakima. 

In 1986, the Yakima River basin was selected as one of four surface-water pilot studies for the 

USGS National Water-Quality Assessment (NAWQA) Program. Data collected from 1987-1991 

provide a baseline characterization of suspended sediment, pesticides, nutrients, trace elements, 

and aquatic life in Yakima River streams. A special NAWQA study was conducted in the 

Yakima during 1999-2000 to monitor water quality trends and evaluate transport of agricultural 

chemicals and their effects on stream ecosystems. NAWQA results are reported by McKenzie 

and Curtiss (1989), Rinella et al. (1999), Morace et al. (1999), Ebbert and Embrey (2002), 

Ebbert et al. (2002), Fuhrer et al. (2004), and others. 

USGS concluded that “agricultural drains in the mid and lower valleys were found to be 

significant sources of nutrients, suspended sediment, pesticides, and fecal indicator bacteria.” 

NAWQA showed the highest detection frequencies and concentrations of pesticides generally 

occur during irrigation season. Their findings indicated pesticides that persist in soil, such as 

DDT, continue to be transported in streams and drains throughout the year, especially during 

storm runoff or snowmelt. 

Groundwater inputs are also potential pesticide sources, including chlorinated pesticides 

normally associated with suspended sediment. DDT compounds, for example, have been 

detected in wells in the Toppenish and Sulphur subbasins of the lower Yakima River (Rinella 

et al., 1999). A recent Ecology study found the highest dieldrin levels in Wide Hollow Creek 

near Union Gap occurred after the irrigation season. Dieldrin was inversely correlated with 
Yakima Pesticides/PCBs TMDL: Vol 1, WQ Study Findings 

Page 20 

discharge and positively correlated with conductivity, suggesting subsurface flow is a source in 

this area (Johnson and Burke, 2006). 

The U.S. Fish and Wildlife Service began routine monitoring of organochlorine compounds in 

Yakima River fish in the 1970s (see Schmitt et al., 1990). They found high concentrations of 

several chlorinated pesticides including DDT and dieldrin. PCBs were also detected. Ecology 

followed up on the pesticide findings in 1985 (Johnson et al., 1986, 1988). A number of creeks 

and irrigation returns were identified as pesticide sources. These include Wilson Creek in the 

upper Yakima basin and Moxee Drain, Granger Drain, Sulphur Creek Wasteway, and Spring 

Creek in the lower Yakima basin. 

NAWQA confirmed continued high concentrations of total DDT in resident lower Yakima River 

fish (Rinella et al., 1993). Fish communities were characterized as being severely impaired 

“associated with high levels of pesticides in fish tissues and the presence of external anomalies 

on fish.” 

In 1993 the Washington State Department of Health (WDOH) issued an advisory that 

recommended limiting consumption of bottom fish from the lower Yakima River due to the high 

levels of total DDT (WDOH, 1993; www.doh.wa.gov/ehp/oehas/fish). Because of the NAWQA 

studies and WDOH advisory, Ecology prioritized suspended sediment TMDLs to reduce DDT 

and other pesticide loading to the Yakima River. 
Yakima Pesticides/PCBs TMDL: Vol 1, WQ Study Findings 

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Existing Yakima River TMDLs 

A number of TMDLs have been approved or are underway in the Yakima River basin including 

TMDLs for fecal coliform bacteria, temperature, ammonia, chlorine, suspended sediment, and 

chlorinated pesticides (www.ecy.wa.gov/programs/wq/tmdl/watershed/index.html). The present 

2007-08 study builds on results achieved through the two suspended sediment and chlorinated 

pesticide TMDLs, described below. 

Lower Yakima River Suspended Sediment and DDT TMDL 

In 1998, a TMDL was established for suspended sediment in the lower Yakima River to bring it 

into compliance with water quality criteria for turbidity and DDT. The basic premise behind this 

TMDL was that suspended sediment from erosion of farm soils was the primary source of DDT 

and other chlorinated pesticides introduced to the river at levels that adversely affected aquatic 

life and cause an increased health risk to people consuming fish. Suspended sediments – 

measured as total suspended solids (TSS) – also cause excessive turbidity in the Yakima River, 

its tributaries, and irrigation returns. 

The combined effects of high TSS, turbidity, and pesticides degrade fish and wildlife habitat. 

Threatened and endangered salmonids are a particular concern. 

The field study for the Lower Yakima River Suspended Sediment and DDT TMDL was conducted 

by Ecology during 1994-1995 (Joy and Patterson, 1997). The schedule adopted for meeting 

water quality targets developed through the TMDL is shown in Table 5. 

Table 5. Summary of Lower Yakima River TMDL Schedule. 

Year Target Applies To 

2002 < 5 NTU* increase above background Mainstem 

25 NTU Mouths of all tributaries and drains 

2007 25 NTU All points within tributaries and drains 

Develop strategy to meet DDT human health criteria 

2012 All tributaries, drains, and the mainstem † 7 mg/L TSS (to meet chronic aquatic life criterion) 

2015 DDT human health criteria to be met in fish and water 

*nephelometric turbidity units. 

†

target to be re-evaluated in 2007. 

According to the schedule, the lower Yakima River mainstem was to be in compliance with the 

Washington State turbidity standard by 2002. Tributaries and irrigation returns to the lower river 

were expected to meet a turbidity target of 25 NTU by 2007. A strategy to further reduce DDT 

levels in the river and meet human health criteria was to be developed the same year. By 2012, 

the mainstem and tributaries are to comply with a 7 mg/L target for TSS, which correlated with 

meeting the chronic aquatic life criterion for total DDT, 1 ng/L. This target was scheduled to be 

re-evaluated in 2007. By 2015 the human health criteria for DDT compounds are to be achieved 

in fish and water. 
Yakima Pesticides/PCBs TMDL: Vol 1, WQ Study Findings 

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Upper Yakima River Suspended Sediment and 

Organochlorine Pesticide TMDL 

Ecology conducted a similar TMDL addressing suspended sediment and organochlorine 

pesticides in the upper Yakima River in 1999 (Joy, 2002; Creech and Joy, 2002). In this context, 

the upper river is the reach from the headwaters to r.m. 121.7, just above the confluence with the 

Naches River. 

The major water quality impacts to the upper Yakima River are from Wilson Creek, which drains 

the Kittitas Valley. The TMDL schedule for the upper Yakima set goals for meeting DDT, 

dieldrin, and turbidity criteria in 2006 and 2011 (Table 6). 

Table 6. Summary of Upper Yakima River TMDL Schedule. 

Year Target Applies To 

2006 

DDT compounds and dieldrin to meet aquatic 

life criteria Cherry Creek and Wipple Wasteway 

DDT compounds to meet human health criteria 

in fish fillets Mainstem 

Monitor dieldrin in fish fillets to gauge progress 

toward meeting human health criteria Mainstem 

90th percentile turbidity < 10 NTU over 

background 

Mainstem (r.m. 121.7 – 139.8) and 

mouths of selected tributaries 

2011 

DDT compounds and dieldrin to meet human 

health criteria in water 

Mouths of Cherry Creek and Wipple 

Wasteway 

Substantial progress made toward meeting 

human health target for dieldrin in fish fillets Upper Yakima Basin 

90th percentile turbidity < 5 NTU over 

background 

Mainstem (r.m. 121.7 – 139.8) and 

mouths of selected tributaries 
Yakima Pesticides/PCBs TMDL: Vol 1, WQ Study Findings 

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2006 Yakima River Fish Tissue Survey 

In view of the existing TMDL schedules and 2004 303(d) listings, Ecology surveyed chlorinated 

pesticide, PCB, and dioxin levels in resident fish species throughout the Yakima River in 2006 

(Johnson et al., 2007). The objectives were to verify that human health criteria were not met 

(exceeded), assess progress toward the TMDL fish tissue targets, and help determine how to 

address the 303(d) listings. Fifty-six composite fillet samples and 30 composite whole fish 

samples were analyzed, representing approximately 300 individual fish. 

Results for the chemicals of primary concern in the fish fillets are summarized in Table 7 and 

compared to the human health criteria for fish consumption used for 303(d) listing (from the 

EPA National Toxics Rule). Concentrations that exceeded criteria are highlighted in bold font. 

DDT, DDD, and endosulfan concentrations were low and did not approach criteria (data not 

shown). Most of the DDT residues have broken down to DDE. Chlorpyrifos was not analyzed 

due to limited potential for bioaccumulation. The complete edible tissue data from the fish tissue 

survey are in Appendix D. 

There was a strong downstream trend in increasing concentrations of DDE, which is illustrated 

in Figure 5. Total PCB concentrations also increased going downstream, but the trend appeared 

less pronounced than seen for DDE (Figure 6). High concentrations of both DDE and PCBs 

were found in lower river carp, a species not encountered in the upper river. Dieldrin and 

toxaphene were primarily or exclusively detected in the lower river. Chlordane, alpha-BHC, 

and dioxin concentrations were low to undetectable in all areas. 
Yakima Pesticides/PCBs TMDL: Vol 1, WQ Study Findings 

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Table 7. Mean Concentrations of Selected 303(d) Listed Compounds and Toxaphene in Composite Fillet SamplFish Collected in 2006 (ug/Kg wet weight, parts per billion; except ng/Kg, parts per trillion, for dioxin). 

Reach Species N = DDE Dieldrin Chlordane Alpha-BHC Total PCBs To

Upper Yakima River Kachess Lake Sucker 3 0.83 0.40 U 0.40 U 0.40 U 2.0 U 

Pike Minnow 3 3.7 0.40 U 0.40 U 0.40 U 16 J 

Keechelus Lake 

Sucker 3 2.2 0.38 U 0.38 U 0.40 U 13 J 

Pike Minnow 2 2.6 0.40 U 0.40 U 0.40 U 17 J 

Kokanee 3 2.2 0.40 UJ 0.70 J 0.40 U 15 J 

Cutthroat 3 0.61 0.39 U 0.23 J 0.40 U 5.6 J 

Whitefish 2 0.73 0.39 U 0.39 U 0.40 U 9.6 J 

Cle Elum 

Sucker 2 7.1 0.39 U 0.41 J 0.40 U 9.5 J 

Pike Minnow 3 11 0.39 U 0.57 J 0.40 U 4.9 J 

Whitefish 3 10 0.40 UJ 2.0 J 0.40 U 16 

Yakima Canyon 

Sucker 3 12 0.93 1.1 J 0.40 U 9.4 J 

Pike Minnow 3 31 0.77 2.3 J 0.40 U 24 

Whitefish 3 34 0.35 J 2.9 J 0.40 U 24 

Lower Yakima River Toppenish 

Sucker 3 63 0.99 J 0.59 J 0.40 U 13 

Pike Minnow 3 113 0.81 0.74 J 0.40 U 16 

Whitefish 3 100 1.3 J 2.0 J 0.40 U 28 

Prosser 

Sucker 3 100 2.3 J 0.68 J 0.39 U 16 J 

Smallmouth Bass 2 38 0.74 J 0.39 U 0.39 U 4.0 J 

Carp 3 500 0.59 J 10 0.39 U 88 

Horn Rapids 

Sucker 3 82 0.95 1.8 J 0.40 U 34 

Pike Minnow 3 78 2.7 J 0.56 U 0.40 U 7.9 J 

Smallmouth Bass 3 54 0.79 0.99 U 0.39 U 18 

Carp 3 520 1.3 J 5.3 J 0.40 U 96 

303(d) Human Health Criteria 32 0.65 8.0 0.51 5.3 Bold values exceed human health criteria. U = not detected. J = estimated value. UJ = not detected; detection limit is an estima*4-5 fish per composite, except 8-15 for dioxin. †Dioxin analyzed in one composite per species per location. 
Yakima Pesticides/PCBs TMDL: Vol 1, WQ Study Findings 

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Figure 5. Mean DDE Concentrations in Yakima River Fish Fillets Collected in 2006 (parts per 

billion, wet weight). 

Figure 6. Mean Total PCB Concentrations in Yakima River Fish Fillets Collected in 2006 (parts 

per billion, wet weight).

 
Yakima Pesticides/PCBs TMDL: Vol 1, WQ Study Findings 

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Overall, results of the 2006 fish tissue survey demonstrated the following: 

 Upper Yakima River fish are meeting or very close to meeting human health criteria for 

DDT, DDE, DDD, dieldrin, chlordane, alpha-BHC, endosulfan, toxaphene, and dioxin. 

 PCBs exceed human health criteria in the Keechelus and Kachess storage reservoirs and 

throughout the Yakima River, with slightly to substantially higher levels in the lower river, 

depending on species and location. 

 Most lower Yakima River fish species exceed human health criteria by factors of 2 to 4 for 

DDE and dieldrin, and factors of 2 to 6 for PCBs. Carp are more contaminated than other 

lower river species. This is likely due to their greater fat content and age of the fish 

analyzed. 

 Chlordane, alpha-BHC, and endosulfan are meeting human health criteria in lower river fish, 

except for carp which marginally exceed the chlordane criterion in the Prosser area. 

 Dioxin levels are low throughout the river, slightly exceeding human health criteria in a few 

cases. 

 Some lower river fish species exceed human health criteria for toxaphene. Toxaphene, a 

legacy chlorinated pesticide, is difficult to analyze and has probably been under-reported in 

the past. 

Based on these findings, Ecology concluded that the TMDL effort to address the current Yakima 

River 303(d) listings should focus on pesticides and PCBs in the lower Yakima River, but 

include some PCB and toxaphene work in the upper river as well. A one-year field study was 

initiated in 2007 to obtain water quality data on these chemicals. 

In view of the low dioxin concentrations in Yakima River fish and due to budget constraints, 

dioxin was not analyzed in the water quality study. Ecology plans to address dioxins on a larger 

scale (possibly region- or state-wide) in the future. Additionally, because dioxins are often 

carried via air and can pollute sizeable areas not necessarily limited to watersheds, a larger 

TMDL footprint will likely be more effective and efficient. 
Yakima Pesticides/PCBs TMDL: Vol 1, WQ Study Findings 

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Goals and Objectives of the 

2007-08 Water Quality Study 

Goals 

The water quality study was conducted to aid in developing a Pesticides and PCBs TMDL for the 

Yakima River. The goals of the study were to: 

1. Identify current sources and quantify loadings of 303(d) listed pesticides, PCBs, toxaphene, 

suspended sediment, and turbidity to the Yakima River. 

2. Recommend numeric water quality targets that will result in the Yakima River and its 

tributaries and irrigation returns meeting Washington State water quality standards for the 

pollutants of concern. 

3. Determine the Yakima River’s loading capacity for these pollutants. 

4. Compare existing water quality conditions to targets set by the Upper Yakima River 

Suspended Sediment and Organochlorine Pesticide TMDL and the Lower Yakima River 

Suspended Sediment and DDT TMDL. 

Objectives 

Specific objectives of the water quality study were to: 

1. Monitor 303(d) listed pesticides, suspended sediment, and turbidity in the lower Yakima 

River, Naches River, and major lower river irrigation returns. 

2. Obtain screening-level data on 303(d) listed pesticides, suspended sediment, and turbidity in 

other lower Yakima River tributaries and returns. 

3. Estimate background concentrations of PCBs and toxaphene in the upper and lower Yakima 

River and identify source areas. 

4. Investigate municipal wastewater treatment plant effluent as a potential source of 303(d) 

listed pesticides and PCBs. 

5. Determine if wastewater from fruit packers and vegetable processors is a source of 303(d) 

listed pesticides. 

6. Characterize 303(d) listed pesticide, PCB, suspended sediment, and turbidity levels in urban 

stormwater runoff. 

 
Yakima Pesticides/PCBs TMDL: Vol 1, WQ Study Findings 

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Yakima Pesticides/PCBs TMDL: Vol 1, WQ Study Findings 

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Study Design 

The water quality study area included the Yakima River and selected tributaries and irrigation 

returns from Easton (r.m. 202.5) to the Columbia River confluence. Most of the effort was 

concentrated in the lower Yakima River due to the greater number of 303(d) listings and because 

a TMDL for suspended sediment and chlorinated pesticides had already been approved for the 

upper Yakima River. Table 8 gives an overview of the sampling design, showing the types of 

samples collected, general locations, sampling frequency, and how the samples were analyzed. 

Field work was initiated in April 2007 and completed in June 2008. Over 400 surface water and 

wastewater samples were collected. The samples were analyzed for all chlorinated pesticides 

and PCBs that have been reported in water, fish, or sediment samples from the Yakima River 

drainage. The chlorinated pesticide analysis was expanded to include chlorpyrifos, an 

organophosphorus insecticide. Suspended sediment (measured as total suspended solids) and 

turbidity were analyzed in all samples. 

The study was conducted by the Ecology Environmental Assessment Program and Central 

Regional Office (CRO) Yakima River TMDL Team. Samples were analyzed by the Ecology 

Manchester Environmental Laboratory or an accredited laboratory selected by Manchester. 

The study followed a Quality Assurance Project Plan (Johnson, 2007a) prepared according to the 

Ecology guidance in Lombard and Kirchmer (2004). 
Yakima Pesticides/PCBs TMDL: Vol 1, WQ Study Findings 

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Table 8. Summary of Sampling Design for the 2007-08 Water Quality Study. 

Task Lower River Upper River Location (Number of Sites) Frequency 

Pesticides 

PCB

Surface Water  Routine Monitoring x Mainstem (4) Naches R. (1) Returns (4) 1-2 per Month 



 Screening Survey x Other Tributaries and Returns (23) Quarterly 



 SPMD Deployments† x x Mainstem (6) Naches R. (1) Returns (5) Twice 





Permitted Discharges  Wastewater Treatment Plants x x Cle Elum to West Richland (18) Quarterly 

* 

 Fruit & Vegetable Processors x Selah, Yakima, Sunnyside, Prosser (6) Quarterly 



 Urban Stormwater Runoff x x Yakima (5) Ellensburg (4) 4-6 Storms 

* 

* Pesticides not analyzed for upper river effluent or stormwater samples. 

†Semipermeable Membrane Device: a passive sampler used in this study for detecting PCBs and toxaphene. 
Yakima Pesticides/PCBs TMDL: Vol 1, WQ Study Findings 

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Surface Water 

Pesticides, Suspended Sediment, and Turbidity 

A two-tiered approach was used for measuring 303(d) pesticides, suspended sediment, and 

turbidity levels in surface waters of the lower Yakima River. Routine monitoring was conducted 

at mainstem stations, tributaries, and irrigation returns that were the focus of monitoring efforts 

for the earlier Suspended Sediment and DDT TMDL. A more limited screening survey was 

conducted for other tributaries and returns deemed to have potential for contamination. Due to 

the high cost of detecting PCBs and toxaphene in whole water samples, these compounds were 

addressed in a separate effort (see PCBs and Toxaphene, page 36). 

Routine Monitoring 

Four mainstem stations, the Naches River, and four major irrigation returns to the lower Yakima 

River were monitored intensively, twice a month during the irrigation season (April – October 

2007 samples) and monthly during the winter (November 2007 – March 2008 samples). Table 9 

lists the monitoring sites. Sampling locations are shown in Figure 7. 

Table 9. Routine Monitoring Stations in the Lower Yakima River Drainage during 2007-08. 

Name and Location River Mile Bank* 

Yakima River at Harrison Bridge 121.7 - - 

 Naches River at mouth 116.3 RB 

 Moxee Drain at Birchfield Road 107.3 LB 

Yakima River at Parker Bridge 104.6 - - 

 Granger Drain at sheep barns in Granger 82.8 LB 

 Sulphur Creek Wasteway at Holaday Road 61.0 LB 

Yakima River at Euclid Bridge 55.0 -- 

 Spring Creek near mouth 41.8 LB 

Yakima River at Kiona-Benton City Bridge 29.8 -- 

*signifies a right or left bank tributary, as seen facing downstream. 

The Yakima River at Harrison Bridge and the Naches River represent background water quality 

conditions for the lower Yakima. The Naches River supplies fairly high-quality water to the 

irrigation system and has relatively few point sources. The Naches is the larger source of water 

to the lower Yakima River during the September - October flip-flop when flows in the upper 

Yakima are reduced to prevent de-watering of salmon redds (nests). The mainstem Yakima 

River stations at Harrison, Parker, Euclid, and Kiona bracket the major irrigation returns and 

urban centers. 
Yakima Pesticides/PCBs TMDL: Vol 1, WQ Study Findings 

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Figure 7. Routine Monitoring Stations in the Lower Yakima River for 2007-08. 

The four irrigation returns monitored – Moxee Drain, Granger Drain, Sulphur Creek Wasteway, 

and Spring Creek – were selected in the previous TMDL as representative of irrigation return 

water that enters the lower Yakima River. They are specifically identified as priority returns in 

the TMDL five-year targets. Snipes Creek, also on the 303(d) list, is a tributary to Spring Creek. 

The routine monitoring effort provided 14 sets of results for the irrigation season and five sets of 

results for the non-irrigation season. Extra weight was given to the irrigation season because 

pesticides are most frequently detected during this period. The previous TMDLs had concluded 

that the irrigation season was the “critical period.” An extra set of samples was collected from 

the four returns in late March at the start of the 2008 irrigation season. 
Yakima Pesticides/PCBs TMDL: Vol 1, WQ Study Findings 

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Screening Survey 

Numerous other tributaries and irrigation returns enter the lower Yakima River but have either 

never been sampled for pesticides or the samples have not been analyzed down to human health 

criteria levels. Twenty-three of these discharges were sampled on a quarterly basis for the 

present study, starting in May 2007 and ending in February 2008 (Table 10). Figure 8 shows 

their locations. This screening survey provided two sets of results each for the irrigation and 

non-irrigation seasons. 

Table 10. Lower Yakima River Tributaries and Irrigation Returns Screened for Pesticides during 

2007-08. 

Name and Location River Mile Bank* 

Selah Creek at Canyon Road 123.7 LB 

Wenas Creek at Wenas Road 122.4 RB 

Selah Ditch at confluence with Taylor Ditch 117.1 RB 

Taylor Ditch at confluence with Selah Ditch 117.1 RB 

Cowiche Creek (Naches tributary) at Powerhouse Road - - - - 

Wide Hollow Creek at Main Street 107.4 RB 

Ahtanum Creek at Fullbright Park† 106.9 RB 

Zillah Drain at 1st Street, Zillah (Joint Drain 14.6) ~89 LB 

East Toppenish Drain at Annahat & Blue Heron Road† 86.0 RB 

Subdrain 35 at Connie Road† 83.2 RB 

Marion Drain at Indian Church Road† 82.6 RB 

Toppenish Creek at Indian Church Road† 80.4 RB 

Coulee Drain at Satus Longhouse Road† 77.0 RB 

Satus Creek at Satus Longhouse Road† 60.2 RB 

South Drain at Highway 22† 69.3 RB 

DID #7 at Green Valley Road 65.1 LB 

Satus Drain #302 at Highway 22† 60.2 RB 

Satus Drain #303 at Highway 22† ~60 RB 

Drain #31 at Sunnyside-Mabton Highway 58.0 LB 

Grandview Drain at Chase Road 55.8 LB 

Wauna Ditch (Drain 52.8) at Wamba Road 47.2 LB 

Corral Canyon Creek at Old Inland Empire Highway 33.5 LB 

Amon Creek Wasteway near mouth 2.1 RB 

*signifies a right or left bank tributary, as seen facing downstream. †

Yakama Reservation. 
Yakima Pesticides/PCBs TMDL: Vol 1, WQ Study Findings 

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Figure 8. Lower Yakima River Tributaries and Irrigation Returns Screened for Pesticides during 

2007-08. 

A large number of tributaries and returns were screened to avoid overlooking significant sources 

of contamination. The sites selected for sampling were recommended by Joe Joy, Ecology’s lead 

investigator for the previous TMDL; the CRO Yakima River TMDL Team; and Marie Zuroske 

of the South Yakima Conservation District. Two of the creeks – Cowiche and Wide Hollow – 

are currently 303(d) listed for several pesticides. The same parameters were analyzed in the 

screening survey as in the routine monitoring effort. Ecology obtained permission to collect 

samples from tributaries and returns on the Yakama Reservation. 

Sample Collection and Analysis 

Routine monitoring and screening survey samples were analyzed for pesticides at detection 

limits of sub-parts per trillion, much lower than in previous Yakima River studies. The depthintegrating samplers often used in the past are not designed for low-level analyses. They are 

difficult to clean adequately and have an increased chance of introducing contamination in an 

agricultural setting. The surface water pesticide samples for the present study were composites 

from quarter-point transects collected directly into appropriately cleaned glass bottles. 

 
Yakima Pesticides/PCBs TMDL: Vol 1, WQ Study Findings 

Page 35 

The bottles were raised and lowered through the water column to approximate the width-depth 

integrated method, either by hand or by placing a sample bottle in a weighted holder. This same 

technique is being used by Ecology to monitor current-use pesticides in lower Yakima River 

irrigation returns (Burke et al., 2006). Suspended sediment and turbidity samples were collected 

using these same procedures, except for routine monitoring samples during the irrigation season 

(see Effectiveness Monitoring below). 

Studies conducted in the Yakima River have shown that both sampling techniques produce 

similar results. Hallock (2005) compared TSS, turbidity, and other water quality data obtained 

for the Yakima River at Kiona using Ecology collected single-point surface grabs vs. USGS 

collected width-depth integrated samples. Only sediment measures were significantly different 

overall, and even for this constituent the difference was small. Hallock pointed out that some of 

the difference in sediment results was attributable to the analytical method. The SSC analysis 

method used by USGS yields significantly higher results than the TSS method used by Ecology, 

even when collection methods are the same. 

A similar comparison was conducted for a range of sites sampled during the Lower Yakima River 

Suspended Sediment and DDT TMDL. There were no significant differences between TSS or 

other results from simple grabs and integrated samples (Joy and Patterson, 1997). 

The routine and screening survey samples from 2007-08 were analyzed for 303(d) pesticides, 

TSS, turbidity, and conductivity. To differentiate between suspended matter derived from plant 

material vs. other sources, a total non-volatile suspended solids (TNVSS) analysis was included. 

Pesticides analysis was by gas chromatography/electron capture detection (GC/ECD). A large 

volume injection (LVI) technique was used to achieve low detection limits for comparison with 

human health criteria. Target compounds for pesticide analysis of surface water are listed in 

Appendix E. 

Effectiveness Monitoring 

The routine monitoring task also provided data for effectiveness monitoring that was required in 

2007 by the current TMDLs. The objective of effectiveness monitoring is to determine if Best 

Management Practices (BMPs) implemented in response to the TMDL are achieving the required 

water quality improvements. Effectiveness monitoring for the Lower Yakima River Suspended 

Sediment and DDT TMDL was first conducted in 2003 and consisted of twice-a-month samples

for TSS and turbidity throughout the irrigation season in the mainstem and priority irrigation 

returns (Coffin et al., 2006). A similar set of samples was collected in 2007. A depth-integrating 

sampler was used to be consistent with 2003 procedures. 

The schedule for the Upper Yakima River Suspended Sediment and Organochlorine Pesticide 

TMDL called for effectiveness monitoring during the 2006 irrigation season. Suspended 

sediment and chlorinated pesticide inputs from the Wilson Creek drainage are the focus of that 

effort. The Kittitas County Water Purveyors, Kittitas County Conservation District, and Ecology 

conducted the required suspended sediment and turbidity monitoring in 2006 (Anderson, 2008), 

but postponed pesticide monitoring to 2007. These pesticide samples were collected during field 

work for the present study and employed the same methods as in the lower river (Coffin and 

Johnson, 2007). 
Yakima Pesticides/PCBs TMDL: Vol 1, WQ Study Findings 

Page 36 

Ecology’s Freshwater Monitoring Unit (FMU) conducted the 2007 effectiveness monitoring 

while assisting with the routine monitoring task. All of the data from the 2007 irrigation season 

that apply to effectiveness monitoring can be found in Appendix J. Reports evaluating the 

effectiveness of the existing TMDLs will be prepared separately by Ecology’s EAP Eastern 

Operations Section and CRO Yakima River TMDL Team. 

PCBs and Toxaphene 

PCBs and toxaphene are complex mixtures of hundreds of individual compounds which are 

difficult and expensive to analyze at low levels. The project budget did not allow enough water 

samples to be analyzed to give representative results for surface water. Although toxaphene was 

analyzed in the routine monitoring and screening survey samples, detection limits were high. 

Therefore, a passive sampling technique using a semipermeable membrane device (SPMD) was 

employed to provide estimates of PCB and toxaphene concentrations in surface water. 

A SPMD is composed of a thin-walled, layflat polyethylene tube filled with triolein, a neutral 

lipid material (Figure 9). When placed in water, dissolved lipophilic (fat soluble) compounds 

like PCBs and toxaphene diffuse through the membrane and are concentrated over time. The 

large chemical residues accumulated in a SPMD translate into detection limits down to parts 

per quadrillion in water. Because SPMDs measure the long-term average concentration of a 

chemical, random fluctuations are smoothed and representativeness of the data improved. 

Studies have shown that chemical concentrations derived from SPMDs are comparable to other 

more complex low-level sampling methods such as solid-phase and liquid-liquid extraction, 

generally agreeing within a factor of 2 (Ellis et al., 1995; Rantalainen et al., 1998; Hyne et al., 

2004). 

Figure 9. SPMD Membrane Mounted on a Spider Carrier. 
Yakima Pesticides/PCBs TMDL: Vol 1, WQ Study Findings 

Page 37 

SPMDs were developed by the USGS Columbia Environmental Research Center, Columbia, 

Missouri and are now of standardized design, patented, and commercially available through 

Environmental Sampling Technologies (EST), St. Joseph, Missouri, 

(www.est-lab.com/index.php). Details of SPMD theory, construction, and applications can be 

found at wwwaux.cerc.cr.usgs.gov/spmd/index.htm and in Huckins et al. (2006). 

Locations where SPMDs were used in the Yakima River are shown in Table 11. The samplers 

were deployed in both the upper and lower river because PCBs exceeded human health criteria in 

both areas. 

Table 11. Sites Where SPMDs Were Deployed in the Yakima River Drainage during 2007. 

Name and Location River Mile Bank*

Yakima River at Easton Diversion Dam 202.5 - - 

Yakima River above Ellensburg† 160.6 - - 

 Wilson Creek near mouth 147.0 LB 

Yakima River at Roza Dam 127.9 - - 

 Naches River at mouth 116.3 RB 

 Moxee Drain at Birchfield Road 107.3 LB 

Yakima River at Sunnyside Diversion Dam 103.8 - - 

 Granger Drain at sheep barns in Granger 82.8 LB 

 Sulphur Creek Wasteway at Holaday Road 61.0 LB 

Yakima River at Prosser Diversion Dam 47.2 -- 

 Spring Creek near mouth 41.8 LB 

Yakima River at Horn Rapids Diversion Dam 18.0 -- 

*signifies a right or left bank tributary, as seen facing downstream. †

Ellensburg Water Company Diversion 

 
Yakima Pesticides/PCBs TMDL: Vol 1, WQ Study Findings 

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SPMDs were placed at three upper river sites (Figure 10). The Easton Diversion Dam site below 

Keechelus Lake and Kachess Lake was intended to provide an estimate of the PCB and 

toxaphene background in the upper mainstem. The other two upper river SPMDs were placed in 

a mainstem diversion above Ellensburg (Ellensburg Water Company diversion) and at the mouth 

of Wilson Creek. Wilson Creek drains the Ellensburg area and Kittitas Valley. This is the most 

developed urban/agricultural area in the upper river and, thus, has the greatest potential to be a 

source of contamination. 

Figure 10. Sites Where SPMDs Were Deployed in the Upper Yakima River during 2007. 

 

 
Yakima Pesticides/PCBs TMDL: Vol 1, WQ Study Findings 

Page 39 

The lower river SPMD sites were the same as or close to the routine monitoring stations 

(Figure 11). SPMDs were deployed at the Roza, Sunnyside, Prosser, and Horn Rapids diversion 

dams rather than the Harrison, Parker, Euclid, and Kiona bridges, because these were not secure 

locations to leave the samplers. In all cases, the SPMDs were placed above the dams. 

Figure 11. Sites Where SPMDs Were Deployed in the Lower Yakima River during 2007. 

 
Yakima Pesticides/PCBs TMDL: Vol 1, WQ Study Findings 

Page 40 

SPMDs were deployed during the first part of the 2007 irrigation season (approximately 

May 8 – June 5) and again after the end of the irrigation season (approximately October 30 –

November 26). Figure 12 shows the flow regime during these periods. The May-June 

deployment occurred while flows were decreasing in the Yakima River and increasing or near 

maximum in the tributaries and returns. The reverse was true during October-November after 

irrigation water had been turned off. 

Figure 12. Monthly Average Flow near Selected SPMD Sites during 2007. 

(USBR Yakima Hydromet data www.usbr.gov/pn/hydromet/yakima) 

Each deployment lasted approximately one month. Water samples were taken at the beginning, 

middle, and end of each deployment and analyzed for total and dissolved organic carbon (TOC 

and DOC). The organic carbon data were used to calculate total water column concentrations for 

the chemicals of interest. Start and end dates for each site are in Appendix F. The ancillary 

water quality data are in Appendix G. 

The Wilson Creek SPMD extract for PCB analysis from May-June 2007 was lost in a laboratory 

accident and re-deployed in 2008 during the same time period. Toxaphene analysis was not 

affected. A review of water quality data for Wilson Creek, provided by the Kittitas County Water 

Purveyors, showed slightly higher turbidity during the 2008 deployment, averaging 21 NTU vs. 

15 NTU in 2007 (N= 4-5; Kathleen Satnik personal communication). Discharge compared 

closely between the two periods, averaging 545 vs. 556 cfs. 

The SPMDs extracts were analyzed for PCBs using high resolution gas chromatography/mass 

spectrometry (HRGC/MS) to achieve low detection limits. Toxaphene was analyzed by 

GC/ECD. The methods used to derive water column concentrations from the PCB and 

toxaphene residues accumulated in the SPMDs are described in Appendix H. 

0

50

100

150

200

250

300

350

400

450

0

1000

2000

3000

4000

5000

6000

7000

8000

9000

10000

Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec

Tributaries (cfs)

Yakima River (cfs)

Yakima nr Umtanum Yakima nr. Parker Yakima @ Kiona

Wilson Cr. Moxee Drain Sulphur Cr.

Spring Deployment Fall Deployment
Yakima Pesticides/PCBs TMDL: Vol 1, WQ Study Findings 

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Permitted Discharges 

One of the mechanisms for achieving goals of the Clean Water Act is the National Pollutant 

Discharge Elimination System (NPDES). EPA has authorized Washington State to administer the 

NPDES permit program in Washington. Chapter 90.48 RCW defines Ecology's authority and 

obligations in issuing wastewater discharge permits. An NPDES permit must be issued before 

discharge of wastewater to waters of the state is allowed. The permits establish effluent limits, 

monitoring schedules, and other requirements. 

Three types of municipal/industrial wastewater discharges that come under NPDES are potential 

sources of pesticides and PCBs to the Yakima River: municipal wastewater treatment plants, 

fruit packers and vegetable processors, and urban stormwater runoff. 

Municipal Wastewater Treatment Plants 

Wastewater treatment plant (WWTP) effluent is not often analyzed for pesticides or PCBs at 

levels approaching human health criteria. In the several instances where this has been done in 

other parts of Eastern Washington, results have shown water quality criteria are often not met 

(exceeded) for PCBs, but infrequently or not substantially exceeded for pesticides (e.g., Lubliner, 

2009; Johnson et al., 2004; Serdar, 2003). 

In August 1999, USGS analyzed pesticides and PCBs in seven municipal WWTPs that discharge 

to the Yakima River between Cle Elum and Prosser (Ebbert and Embrey, 2002). Except for trace 

amounts of lindane, chlorinated pesticides were not found at detection limits down to 1-4 ng/L 

(parts per trillion). PCBs were not detected at or above 100 ng/L. The human health criteria are 

considerably lower than the levels analyzed: <1 ng/L for most pesticides and 0.17 ng/L for 

PCBs. 

Twenty-onec

 municipal WWTPs currently discharge to the Yakima River or its tributaries 

(Table 12, Figure 13). Final effluents from 18 of these facilities were monitored on a quarterly 

basis for the 2007-08 water quality study. The three remaining WWTPs — Wapato, Harrah, and 

Toppenish — are on the Yakama Reservation and under EPA jurisdiction. These facilities were 

not sampled. 

The effluent samples were collected as composites taken over a two-day period. Effluent data 

obtained by Ecology at other WWTPs have shown little variation in PCB concentrations over 

two days (Golding, 2002). Each composite consisted of four grabs: two in the morning and two 

in the afternoon. Effluent flow is greater in the morning, but the effluent is more concentrated in 

the afternoon. The grabs were hand collected to avoid contamination that could occur with an 

automatic sampler. 

 

 

c

 Moxee WWTP ceased operating on June 26, 2008; the wastewater now goes to the Yakima WWTP. 
Yakima Pesticides/PCBs TMDL: Vol 1, WQ Study Findings 

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Table 12. Wastewater Treatment Plants in the Yakima Basin. 

Permit No. Facility Name 

NPDES 

Permit 

Expires 

Receiving Water 

 Average Flow 

Maximum 

Month 

(MGD) 

Upper Yakima River 

WA002193-8 Cle Elum 31-Aug-11 Yakima River at ~ r.m. 183 3.6 

WA-002125-3 Kittitas 29-Feb-12 Cooke Creek to Wilson Creek 0.45 

WA-002434-1 Ellensburg 30-Nov-10 Yakima River at r.m. 151.6 8.0 

Lower Yakima River 

WA0021032C Selah 29-Feb-12 Selah Ditch to Yakima R. at r.m. 117.1 2.0 

WA0022586C Naches 30-Nov-12 Naches River 0.17 

WA0052396A Cowiche 31-Mar-13 North Fork Cowiche Creek 0.44 

WA0024023C Yakima 30-Jun-11 Yakima River at r.m. 110.1 21.5 

WA0022501C Moxee† 31-Oct-07 DID #11 to Moxee Drain 0.15 

WA0050229 Wapato* 31-Mar-10 Drainage Way #2 to Yakima River NA 

WA0052132C Buena 31-Aug-11 Unnamed trib to Yakima R. at r.m. 91.7 0.12 

WA0022705 Harrah* 30-Sep-11 Harah Drain to Yakima River 0.055 

WA0020168C Zillah 31-Oct-11 Yakima River at r.m. 89.5 0.49 

WA0026123 Toppenish* 25-Nov-08 Toppenish Drain to Yakima River 1.9 

WA0022691C Granger 31-Oct-13 Yakima River at r.m. 82.8 0.32 

WA0020991C Sunnyside 30-Sep-13 Sulphur Cr. via Tributary 3.0 

WA0052426A Port of Sunnyside** 28-Feb-10 Joint Control Drain 33.4 to Sulphur Cr. 0.55 

WA0020648C Mabton 30-Apr-12 Yakima River at r.m. 59.7 0.19 

WA0052205B Grandview 30-Nov-08 Yakima River at r.m. 55.2 5.0 

WA0020800D Prosser 31-Oct-11 Yakima River at r.m. 46.5 1.8 

WA0051349C Benton City†† 30-Nov-13 Yakima River ~r.m. 19 0.32 

WA0051063C West Richland 31-Oct-12 Yakima River ~r.m. 9 0.75 

*Yakama Indian Reservation; not sampled for present study. MGD = million gallons per day. 

†

ceased operating in June 2008. NA = not available. 

**can land apply February through October. 

††discharges to Yakima River only during cold weather months. 
Yakima Pesticides/PCBs TMDL: Vol 1, WQ Study Findings 

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 Figure 13. Wastewater Treatment Plants in the Lower Yakima River Basin. 

The LVI procedure used for pesticides in surface water works poorly on WWTP effluent due to 

the presence of numerous interfering substances. Therefore, pesticides were analyzed in the 

effluent samples using solid phase extraction (SPE), a less sensitive technique. Reporting limits 

were approximately 2-5 ng/L for 303(d) pesticides and approximately 25 ng/L for toxaphene, 

higher than some of the water quality criteria. As a result, this effort constitutes a screeninglevel assessment of 303(d) pesticides and toxaphene in WWTP discharges to the Yakima River. 

Because data from other WWTPs suggest PCBs are a greater concern than pesticides, PCBs were 

analyzed by HRGC/MS to achieve detection limits consistent with the human health criteria. 

Effluent samples from the Cle Elum, Ellensburg, and Kittitas WWTPs were not analyzed for 

pesticides, since a TMDL has already been established for these compounds in the upper Yakima 

River, 

Target compounds for WWTP effluent are listed in Appendix I. Ancillary parameters included 

TSS, turbidity, and conductivity. Flow data were obtained from WWTP records. 
Yakima Pesticides/PCBs TMDL: Vol 1, WQ Study Findings 

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Fruit Packers and Vegetable Processors 

Process water discharged from fruit packers and vegetable processors is a potential link between 

agricultural land that harbors pesticide residues and the Yakima River. Dust and soils that may 

contain pesticides are washed or otherwise removed from fruits, vegetables, and transport 

containers during processing and washed into wastewater systems. DDT, for example, has been 

detected in process water at fruit packing facilities in the Okanogan area (Gary Struthers 

Associates, 2005) 

Of the many fruit packers and vegetable processors in the lower Yakima Valley, only six 

discharge directly to surface waters (Table 13, Figure 14). This excludes those which discharge 

non-contact cooling water. All other facilities route their effluent to WWTPs or land apply. 

Process water from the six facilities listed below was collected quarterly using the same 

techniques as for the WWTPs. The samples were analyzed for pesticides (Appendix E), TSS, 

turbidity, and conductivity. Because of the increased potential for pesticides being present in 

these effluents, the samples were analyzed by LVI to achieve low detection limits. These types 

of facilities are not known to be PCB sources. Therefore, PCBs were not analyzed. Flow data 

were obtained from each facility. 

Table 13. Fruit Packers and Vegetable Processors Monitored during 2007-08. 

Permit No. Company / Facility Name Location Receiving Water 

WAG 43-5126 Zirkle Fruit / Harrison Plant Selah Ditch to Taylor Ditch to 

Yakima River 

WAG 43-5160 Apple King LLC / Apple King Facility 

Yakima 

Gleed Ditch to Naches River 

WAG 43-5074 Gilbert Orchards Ditch to Stock Watering Pond 

WA-000056-6 Snokist Growers / Terrace Heights Cannery Yakima River at r.m. 113.0 

WAG 43-5054 Andrus & Roberts Produce Sunnyside SVID Ditch to Yakima River 

WA-002175-0 ConAgra Foods – Lamb Weston* Prosser Yakima River at r.m. 47.0 

*Scheduled to close in May 2010; formerly Twin City Foods. 

 
Yakima Pesticides/PCBs TMDL: Vol 1, WQ Study Findings 

Page 45 

Figure 14. Fruit Packers and Vegetable Processors Monitored in the Lower Yakima River Basin 

during 2007-08. 

Urban Stormwater Runoff 

In 2006, Ecology issued a draft version of the Phase II Municipal Stormwater Permit for Eastern 

Washington for public comment. The final permit became effective February 16, 2007. By EPA 

mandate in November 2002, a TMDL must address the pollutant loads from NPDES permitted 

stormwater discharge. Stormwater runoff can accumulate and transport pollutants such as 

pesticides, PCBs, and sediment via the stormwater conveyance system to receiving waters and 

thereby degrade water quality. The occurrence of these types of contaminants has been 

documented in several stormwater studies in other parts of Eastern Washington (Lubliner et al., 

2006; Serdar et al., 2006; Parsons, 2007). Some of these data are presented later in this report. 

Phase II communities are identified under the rule as jurisdictions that: (1) own and operate a 

municipal separate storm sewer system (MS4), (2) discharge to surface waters, (3) are located in 

urbanized areas, and (4) have a population of greater than 10,000 and less than 100,000. Yakima 

basin cities that come under Phase II are Ellensburg, Selah, Yakima, Union Gap, urbanized 

portions of Yakima County, Sunnyside, West Richland, and Richland. Richland has one or two 

storm drains that run to the Yakima River and others that connect to Amon Creek Wasteway, but 

West Richland discharges to an irrigation canal that goes to the Columbia River near Finley. 
Yakima Pesticides/PCBs TMDL: Vol 1, WQ Study Findings 

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Within the limited wet-weather season covered by the water quality study, it was impractical to 

obtain stormwater samples from all these cities. Eastern Washington storms usually have very 

little onset rainfall and a short duration single peak. The storms are also geographically sporadic. 

Low rainfall in Sunnyside and Richland, for example, makes it extremely difficult to catch 

storms. Therefore, stormwater sampling for the water quality study focused on characterizing 

pollutant levels in runoff from the Yakima/Union Gap and Ellensburg urban areas, with the 

intent of applying the results to other Phase II stormwater communities in the TMDL. 

Eight storm events were captured during the winter and spring of 2007-08. Two to five storm 

drains were sampled each time in Yakima/Union Gap and Ellensburg (Figures 15 and 16). To 

the extent possible, the drains sampled represented typical urban, commercial, and residential 

land uses. The field study for the Yakima Area Creeks Fecal Coliform TMDL identified a 

number of potential sampling sites around Yakima (Joy, 2005). The drains sampled in the 

present study were selected in consultation with the cities of Yakima and Ellensburg. 

Storm duration and intensity are likely the greatest factors in generating pollution. However, 

logistical restrictions effectively reduce most sampling efforts to grabs or manual composites at 

any given period during a storm. The stormwater samples for the present study consisted of 

either single grabs or a composite of two grabs collected 10-40 minutes apart, depending on the 

anticipated duration of stormwater influx. Many of these drains flow year-round, with base 

flows likely supplied by groundwater input. Sampling was delayed until turbid water began to 

flow.

The stormwater samples were analyzed for pesticides (SPE, Appendix I), PCBs (HR GC/MS), 

TSS, turbidity, and conductivity. The Ellensburg samples were not analyzed for pesticides due 

to the existing TMDL for these compounds. 

Stormwater comes under NPDES regulation in three additional areas: Washington State 

Department of Transportation (DOT), construction projects, and industrial facilities. 

DOT highways and facilities are required to be covered under a MS4 permit. DOT controls the 

major roads and highways through the urbanized areas of the Yakima basin (e.g., U.S. Highways 

97 and 12, Interstate 82, and State Route 24). Highway surfaces are significant contributors to 

stormwater runoff volume, but are not known to be significant sources of any of the 303(d) listed 

pesticides or PCBs. 

The NPDES Construction Stormwater General Permit covers soil disturbance for projects of one 

acre or more. These types of activities are potential sources of pesticides or PCBs when building 

on farm land or ground that has been otherwise contaminated. While no specific sampling was 

conducted for construction sites, the stormwater samples would include contributions from 

ongoing construction within the urban areas being monitored. 

Fifteen industries in the Yakima basin fall under the NPDES Industrial General Stormwater 

Permit. These include fruit packers, vegetable processors, manufacturing companies, industrial 

parks, log yards, air carriers, and transit. Selected fruit packers and vegetable processors were 

monitored through their wastewater. The other types of industries are not known as sources of 

pesticides or PCBs and thus were not monitored. 
Yakima Pesticides/PCBs TMDL: Vol 1, WQ Study Findings 

Page 47 

Figure 15. Location of Yakima and Union Gap Storm Drains Sampled during 2007-08. 
Yakima Pesticides/PCBs TMDL: Vol 1, WQ Study Findings 

Page 48 

Figure 16. Location of Ellensburg Storm Drains Sampled during 2007-08. 
Yakima Pesticides/PCBs TMDL: Vol 1, WQ Study Findings 

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Number of Samples 

The approximate number and timing of samples collected for each task in the Yakima River 

pesticides and PCBs water quality study is shown in Table 14. 

Table 14. Number of Samples Collected for the 2007-08 Water Quality Study. 

Task

Approximate Number of Samples 

April 

May June 

July 

August 

September 

October 

November 

December 

January 

February 

March 

April 

May June 

SubTotal 

Surface Water

 Routine Monitoring 18 18 18 18 18 18 9 9 9 9 9 13 166 

 Screening Survey 22 22 22 22 88 

 SPMD Deployments 12 12 24 

Permitted Discharges

 Wastewater Treatment Plants 18 18 18 18 72 

 Fruit & Vegetable Processors 6 6 6 6 18 

 Urban Stormwater Runoff 5 8 7 5 3 28 

Total = 396 

Other Sources of Contamination 

A variety of other potential sources of 303(d) listed pesticides and PCBs exist within the Yakima 

River basin. These include, but are not limited to, landfills, illegal dumpsites, hazardous waste 

sites, toxic cleanup sites, and pesticide handling facilities that will fall under regulations other 

than the Water Quality Laws to investigate and stop discharge if and when they are identified as 

potential sources of water pollution. 

It was beyond the scope of this water quality study to investigate all of these sources. For 

purposes of the TMDL, they will be considered part of the nonpoint load. 

 
Yakima Pesticides/PCBs TMDL: Vol 1, WQ Study Findings 

Page 50 

This page is purposely left blank 
Yakima Pesticides/PCBs TMDL: Vol 1, WQ Study Findings 

Page 51 

Field Procedures 

Sample containers, preservation, and holding times for the water samples collected during this 

project are shown in Table 15. A detailed description of procedures for collecting each type of 

sample follows. 

Table 15. Field Procedures for Water Samples. 

Parameter Minimum 

Sample Size Container Preservation Holding Time 

Pesticides (LVI) 1 gallon 1 gal. glass; Teflon lid Cool to 4oC 7 days 

Pesticides (SPE) 1 liter 1 L amber glass; Teflon lid Cool to 4oC 7 days 

PCBs 1 liter 1 L amber glass; Teflon lid Cool to 4oC 1 year 

TSS/TNVSS 1,000 mL 1 L poly bottle Cool to 4oC 7 days 

Turbidity 100 mL 500 mL poly bottle Cool to 4oC 48 hours 

Organic Carbon 50 mL 60 mL poly bottle HCl to pH<2, 4oC 28 days 

Conductivity 300 mL 500 mL poly bottle Cool to 4oC 28 days 

LVI = large volume injection (low detection limits). 

SPE = solid phase extraction (routine detection limits). 

Surface Water 

Routine Monitoring and Screening Survey 

The routine monitoring and screening survey samples were collected by hand in one-liter, amber 

glass, narrow-mouth bottles, cleaned to EPA (1990) quality assurance/quality control (QA/QC) 

specifications. Bridge samples were taken by placing the bottle in a metal holder that orients the 

mouth of the bottle upstream and lowering the sampler on a line. Wadeable streams were 

sampled by hand. The samples were taken as composites from a quarter-point transect across the 

width of the stream. The sample bottle was lowered and raised through the water column to 

obtain a depth integrated sample. Grabs from each transect were composited into appropriate 

sample containers for pesticides, TSS, turbidity, and conductivity. A new bottle was used for 

each sample site. 

A number of the TSS and turbidity samples collected during the irrigation season were also 

intended for TMDL effectiveness monitoring. These samples were taken using depth- and 

width-integrating procedures consistent with the previous effectiveness monitoring effort 

(Coffin et al., 2006). Deepwater sites were sampled with a US-DH-59 or a US-DH-76 attached 

to a rope. A US-DH-81 sampler was used for wadeable streams. Three verticals representing 

equal widths of the stream cross-section were sampled. 
Yakima Pesticides/PCBs TMDL: Vol 1, WQ Study Findings 

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Where required, streamflow was measured using a Swoffer Model 2100 or Marsh-McBirney 

Model 201 meter and top-setting rod. The latitude and longitude of each sampling site was 

recorded from a global positioning system (GPS) receiver. 

All water samples were placed on ice, returned to Ecology Headquarters (HQ), and held in a 

secure cooler for later transport with chain-of-custody record to the Ecology Manchester 

Environmental Laboratory. 

Semipermeable Membrane Devices 

Deployment and retrieval procedures for SPMDs followed standard operating procedures of the 

Ecology EA Program (Johnson, 2007b). Standard SPMDs (91 x 2.5 cm membrane containing 

1 mL triolein) and the stainless steel canisters (16.5 x 29 cm) and spindle devices that hold the 

membranes during deployment were obtained from Environmental Sampling Technologies 

(EST). The SPMDs were preloaded onto the spindles by EST in a clean room and shipped in 

solvent-rinsed metal cans under argon atmosphere. The SPMDs were kept frozen until deployed. 

, to await 

On arriving at the sampling site, the cans were pried open, spindles slid into perforated stainless 

steel canisters, and the device anchored and tethered in the stream. Field personnel wore nitrile 

gloves and did not touch the membranes. Water samples for total and dissolved organic carbon 

(TOC, DOC) were collected at the beginning, midpoint, and end of each deployment. 

The SPMDs were deployed for approximately one month, as recommended by USGS and EST. 

The retrieval procedure was essentially the opposite of deployment. The cans holding the 

SPMDs were carefully sealed and the SPMDs maintained at or near freezing for next day 

shipment to EST for extraction. Chain-of-custody was maintained. 

Wastewater Treatment Plants 

The WWTP samples were composites of the final effluent. Each composite consisted of two 

grabs per day (morning and afternoon) for two days. 

The grabs were taken with 1-liter amber glass bottles, cleaned to EPA (1990) QA/QC 

specifications, and split into appropriate sample containers (Table 13). A new 1-liter bottle was 

used for each sample. The samples were kept on ice and in the dark during the compositing 

period. 

The effluent samples were returned to Ecology HQ and held in a secure cooler for later transport 

with chain-of-custody record to Manchester Laboratory. Manchester packaged the PCB samples 

and shipped them to an accredited contract laboratory for HR GC/MS analysis. The remaining 

samples were analyzed at Manchester. 
Yakima Pesticides/PCBs TMDL: Vol 1, WQ Study Findings 

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Fruit Packers and Vegetable Processors 

Sample collection and handling for fruit packer and vegetable processor effluents followed the 

same procedures used for WWTPs, except PCB samples were not taken. 

Stormwater 

Pesticide, PCB, TSS, turbidity, and conductivity samples were collected as simple grabs or 

composites of two grabs collected over a 15-minute period during the early part of the storm. 

Pesticide samples were not collected for Ellensburg. Samples were taken directly into the 

appropriate container (Table 15) and kept on ice at all times. 

The stormwater samples were returned to Ecology HQ and held in a secure cooler for later 

transport with chain-of-custody record to Manchester Laboratory. Manchester packaged the 

PCB samples and shipped them to an accredited contract laboratory for HR GC/MS analysis. 

The remaining samples were analyzed at Manchester. 
Yakima Pesticides/PCBs TMDL: Vol 1, WQ Study Findings 

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Laboratory Methods 

Table 16 shows sample preparation, analysis methods, and laboratories used in this study. 

Table 16. Laboratory Methods for Water Samples. 

Analysis 

Sample 

Preparation 

Method 

Analytical 

Method Laboratory 

Surface Water 

 Pesticides EPA 3510M LVI*/EPA 8081 Manchester 

 TSS N/A EPA 160.2 Manchester 

 TNVSS N/A SM 2540E Manchester 

 Turbidity N/A EPA 180.1 Manchester 

 Conductivity N/A EPA 120.1 Manchester 

 TOC/DOC N/A EPA 415.1 Manchester 

SPMDs 

 Toxaphene dialysis/GPC† EPA 8081 EST/Manchester 

 PCBs dialysis/GPC† EPA 1668A Pace 

WWTP Effluent 

 Pesticides EPA 3535M (SPE**) EPA 8081M Manchester 

 PCBs EPA 1668A EPA 1668A Pace, Test America, 

Pacific Rim 

 TSS N/A EPA 160.2 Manchester 

 Turbidity N/A EPA 180.1 Manchester 

 Conductivity N/A EPA 120.1 Manchester 

Fruit &Vegetable Effluents 

 Pesticides EPA 3510M LVI/EPA 8081 Manchester 

 TSS N/A EPA 160.2 Manchester 

 Turbidity N/A EPA 180.1 Manchester 

 Conductivity N/A EPA 120.1 Manchester 

Stormwater 

 Pesticides EPA 3535M (SPE) EPA 8081M Manchester 

 PCBs EPA 1668A EPA 1668A Pace, Pacific Rim 

 TSS N/A EPA 160.2 Manchester 

 Turbidity N/A EPA 180.1 Manchester 

 Conductivity N/A EPA 120.1 Manchester 

*large volume injection. 

†

EST SOPs E14, E15, E19, E21, E33, E44, E48. 

**solid phase extraction. 
Yakima Pesticides/PCBs TMDL: Vol 1, WQ Study Findings 

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Data Quality Assessment 

Data Review and Verification 

The Ecology Manchester Laboratory reviewed the chemical data for this project. For results 

generated by Manchester, final data review was performed by the unit supervisor or an analyst 

experienced with the method. Chemists on the Manchester Laboratory staff performed the 

review for analytical work sub-contracted to commercial laboratories. Quality assurance and 

quality control at Manchester are described in the Lab Users Manual (Ecology intranet: 

http://aww.ecologydev/programs/eap/forms/labmanual.pdf). 

Manchester prepared written case narratives assessing the quality of all data collected. These 

reviews include a description of analytical methods and an assessment of holding times, initial 

and continuing calibration and degradation checks, method blanks, surrogate recoveries, internal 

standard recoveries, matrix spike recoveries, laboratory control samples, and laboratory 

duplicates. The reviews and the complete Manchester data reports are available from the author 

on request. 

A Quality Assurance Project Plan (Johnson, 2007a) established measurement quality objectives 

(MQOs) for accuracy, bias, and reporting limits. To determine if MQOs were met, the project 

lead compared results on field and laboratory quality control samples to the MQOs. To evaluate 

whether the reporting limit targets were met, the results were examined for non-detects and to 

determine if any values exceeded the lowest concentration of interest. Based on these 

assessments and a review of the laboratory data packages and Manchester’s data verification 

reports, the data were either accepted, accepted with appropriate qualifications, or rejected and 

re-analyzed or re-sampled where possible. 

In the present report, qualified data are flagged as follows: 

 U = The analyte was not detected at or above the reported sample quantitation limit. 

 UJ = The analyte was not detected at or above the reported sample quantitation limit. 

However, the reported quantitation limit is approximate and may or may not represent the 

actual limit of quantitation necessary to accurately measure the analyte in the sample. 

 J = The analyte was positively identified; the associated numerical value is the approximate 

concentration of the analyte in the sample. 

 N = The analysis indicates the presence of an analyte for which there is presumptive 

evidence to make a tentative identification. 

 NJ = The analysis indicates the presence of an analyte that has been tentatively identified, 

and the associated numerical value represents its approximate concentration. 

 E = Reported result is an estimate because it exceeds the calibration range. 

 REJ = The sample results are rejected due to serious deficiencies in the ability to analyze the 

sample and meet quality control criteria. The presence or absence of the analyte cannot be 

verified. 
Yakima Pesticides/PCBs TMDL: Vol 1, WQ Study Findings 

Page 56 

Field Blanks 

Transfer blanks and bottle blanks were analyzed to detect contamination arising from sampling 

procedures. The blanks were prepared in the field using sample bottles filled with blank water at 

the analyzing laboratories. The transfer blanks were prepared by pouring the blank water into 

new sample containers. The bottle blanks were carried through the survey unopened. All field 

blank results are included in the data appendices. 

Pesticides were not detected in any of the field blanks, except for one instance of a trace of 

endosulfan sulfate. Endosulfan sulfate has never been shown to be a chemical of concern in the 

Yakima River. 

PCBs were detected in the field blanks associated with WWTP effluent and stormwater 

sampling. The levels were similar in both the bottle and transfer blank indicating the sampling 

method was not contributing additional PCBs to the samples. Because the blank water is not 

used in analyzing the samples, the field blanks do not indicate contamination at the laboratory, 

which is assessed with method blanks. Only those PCB compounds detected at greater than 10 

times the method blank were included in the PCB concentrations reported here for effluent, 

stormwater, and SPMD samples. 

Because SPMDs sample vapors while being exposed to air, field blanks were needed to assess 

chemical accumulation during deployment and retrieval. The SPMD field blank consisted of 

five membranes in an argon-filled stainless steel can. It was exposed to the air for the average 

amount of time it took to open and place the SPMDs in the water, typically one to three minutes. 

The blank was then resealed and refrozen. It was taken back into the field and opened and 

closed again to mimic the retrieval process. The blank was prepared, processed, and analyzed 

the same as deployed SPMDs. There were two field blanks for each sampling period, one in the 

upper reaches of the Yakima River at Easton and one in the lower Yakima River at Sulphur 

Creek Wasteway. 

A PCB background was present in the SPMD field blanks. It appeared to have originated at EST 

laboratory where the membranes were prepared. Because the PCB levels agreed closely among 

the field and laboratory blanks (i.e., within 4%), the average of the field blank values was 

subtracted from the samples before calculating final water column PCB concentrations. 

Toxaphene was not detected in the blanks. The results for the SPMD field blanks are in the data 

appendices. 

Replicate Samples 

Field replicate samples were collected to provide estimates of the total variability (field + 

laboratory) associated with the data generated in this study. The replicates were collected in 

pairs within a few minutes of each other. For SPMDs, the replicates consisted of separate 

samplers deployed in the same vicinity. Sites for replication were rotated through the study area 

to cover a range of analytes and concentrations. One or two sets of replicates were analyzed with 

every sample collection, except every few months for routine pesticide monitoring. The results 

are in the data appendices. 
Yakima Pesticides/PCBs TMDL: Vol 1, WQ Study Findings 

Page 57 

The relative percent difference between replicates for the constituents of primary interest in this 

study is summarized in Table 17. For pesticides, TSS, and turbidity, the replicates agreed within 

30% or better in most cases. Greater variability was encountered for PCBs, 33-66%. In terms of 

PCB concentrations, this translates into a difference of about a factor of 2 or less. Overall, the 

most variable results were obtained on organic compounds in stormwater. The complete results 

on replicate samples are in the data appendices. 

Table 17. Mean Relative Percent Difference* Between Replicate Field Samples Analyzed 

during the 2007-08 Water Quality Study. 

Sample Type N= DDE Dieldrin Chlorpyrifos Endosulfan 

Surface water (routine monitoring) 12 6% 12% 10% 7% 

Surface water (screening survey) 8 11% 8% 34% 29% 

SPMDs 3 31% 17% 12% 11% 

WWTP effluent 6-8 ND ND 18% 4% 

Fruit and Vegetable effluent 4 2% 19% 32% 22% 

Stormwater 4-6 19% 22% 47% 25% 

Sample Type N= Total PCBs Toxaphene TSS Turbidity 

Surface water (routine monitoring) 12 NA ND 11% 10% 

Surface water (screening survey) 8 NA ND 25% 14% 

SPMDs 3 35% 6% NA NA 

WWTP effluent 6-8 42% ND 2% 14% 

Fruit and Vegetable effluent 4 NA ND 7% 16% 

Stormwater 4-6 66% 4% 18% 8% 

*difference between replicates as percent of replicate average. 

NA = not analyzed. 

ND = not detected. 
Yakima Pesticides/PCBs TMDL: Vol 1, WQ Study Findings 

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Yakima Pesticides/PCBs TMDL: Vol 1, WQ Study Findings 

Page 59 

Results of the 2007-08 Water Quality Study 

Water Supply 

In describing conditions in the Yakima River, Fuhrer et al. (2004) cautioned that water 

availability and dilution effects must be considered when comparing water quality between years 

or examining findings from a particular year. Streamflows in the basin vary from year to year 

depending on snowfall, snowmelt, and how the irrigation system is operated. 

Figure 17 shows the flow in the lower Yakima River at Kiona while the 2007-08 water quality 

study was being conducted. Kiona is located at Benton City, about 30 miles upstream of the 

Columbia River. The 2007-08 data are compared to the average daily flow at this site from 1933 

to 2007. This period dates back to when the last of the six storage dams at the headwaters of the 

Yakima and Naches Rivers was completed. 

Figure 17. Historical Flow in the Yakima River vs. Flow during the 2007-08 Water Quality 

Study. 

(USGS 12510500, Yakima River at Kiona http://waterdata.usgs.gov/wa/nwis/sw) 

Mainstem flows tracked historical averages fairly closely during most of the 2007 irrigation 

season (April to October). Note that peak high and low flows in the historical data are smoothed 

out by averaging. 

0

1,000

2,000

3,000

4,000

5,000

6,000

7,000

8,000

9,000

10,000

Apr May Jun Jul Aug Sep Oct Nov Dec Jan Feb Mar

Flow (cfs)

1933-2007 2007-2008
Yakima Pesticides/PCBs TMDL: Vol 1, WQ Study Findings 

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Streamflow departed from the historical average in several instances. There was a large 

snowmelt event in March 2007 with the bulk of the runoff extending into April. A series of four 

storms also brought rain and increased runoff in April. Much of the snow that would normally 

have melted in June melted in March and April. The last part of December through the middle 

of February was characterized by cold temperatures and heavy snowfall in the mountains, and 

thus lower flows. (www.wrh.noaa.gov/pdt/climate/monthInReview/index.php?wfo=pdt). 

The average annual flow at Kiona since the TMDL effort was initiated is plotted in Figure 18. 

The first year of sampling for the Lower Yakima River Suspended Sediment and DDT TMDL was 

1994, a drought year. A period of higher than average runoff occurred over the next six years, 

followed by another drought in 2001. Flows have been lower than average over the past several 

years. Water supplies since about 1994 have generally been less than the historical mean would 

indicate they should have been over the last decade and a half (Coffin, 2008). 

The average flow during 2007 was close to the long-term mean − 3,813 cfs vs. 3,516 cfs, 

respectively. Most of the surface water samples for the water quality study (80%) were collected 

during this period. Therefore, the results reported here should be representative of the typical 

flow regime in the Yakima River basin, at least to the extent that they do not reflect a particularly 

low- or high-flow year. 

Figure 18. Annual Mean Flow in the Yakima River at Kiona, 1994-2007. 

(USGS 12510500, http://waterdata.usgs.gov/wa/nwis/sw)

0

1,000

2,000

3,000

4,000

5,000

6,000

7,000

1994 1995 1996 1997 1998 1999 2000 2001 2002 2003 2004 2005 2006 2007

Flow (cfs)

1933-2007 Mean Flow
Yakima Pesticides/PCBs TMDL: Vol 1, WQ Study Findings 

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Surface Water Quality 

Pesticides 

Four stations on the lower Yakima River mainstem, the Naches River, and four major left-bank 

irrigation returns were monitored for chlorinated pesticides, the organophosphate insecticide 

chlorpyrifos, suspended sediment, and turbidity from April 2007 through March 2008. Samples 

were collected twice-a-month during the irrigation season and monthly during the non-irrigation 

season, providing results for approximately 170 samples, 18-19 samples per site. Sampling 

locations were shown previously in Figure 7. 

Pesticides other than those on the 303(d) list were infrequently detected and, when present, the 

levels were low. These results are not discussed further. All of the data obtained on pesticides 

and ancillary water quality parameters in surface water samples can be found in Appendices J 

and K. 

The complete project data are also available through Ecology’s Environmental Information 

Management (EIM) website www.ecy.wa.gov/eim/index.htm; search User Study ID AJOH0055. 

Detection Frequency and Concentration Ranges 

Lower Mainstem and Naches River 

Results for 303(d) listed pesticidesd

 in the lower Yakima mainstem and Naches River are 

summarized in Table 18. Concentrations are in units of ng/L (nanograms per liter) which is 

equivalent to parts per trillion. The reporting limit was used to calculate summary statistics 

when a pesticide was not detected.e The same convention is followed throughout the report, 

unless stated otherwise. 

The pesticides or breakdown products most frequently detected in the Yakima mainstem and 

Naches River were DDE, chlorpyrifos, and endosulfan: 76%, 61%, and 49% of samples, 

respectively. DDD and dieldrin were detected less frequently: 26% and 22% of samples. 

DDT was reported in only 18% of the samples, most of it having broken down to DDE and 

DDD. The other two 303(d) pesticides analyzed, chlordane and alpha-BHC, were below the 

limits of detection. The reporting limit for these compounds was 0.061-0.067 ng/L. 

Toxaphene was not detected at or above 3 ng/L (data not shown). Low detection limits could not 

be achieved for toxaphene in these samples due to interferences. Better toxaphene data were 

obtained through the use of SPMD passive samplers (see PCBs and Toxaphene, page 102). 

 

d

 In this report, the terms DDT, DDE, and DDD refer to the 4,4’ isomers. The 2,2’ isomers are also present but at 

insignificant levels. Endosulfan is the sum of detected concentrations of endosulfan I and endosulfan II. Chlordane 

is the sum of detected concentrations of cis & trans chlordane, cis & trans nonachlor, and oxychlordane. 

e

 The detection limit is the lowest concentration where there is evidence of the analyte being present. The reporting 

limit is the lowest concentration that can reliably be reported, based on method blanks, instrument calibration, and 

other factors. 
Yakima Pesticides/PCBs TMDL: Vol 1, WQ Study Findings 

Page 62 

Table 18. Summary of Results from Monitoring 303(d) Listed Pesticides at Four Locations in 

the Mainstem Lower Yakima River and in the Naches River during 2007-08: Yakima River at 

Harrison Bridge, Naches River at mouth, Yakima River at Parker Bridge, Yakima River at 

Euclid Bridge, Yakima River at Kiona Bridge (concentrations in ng/L, parts per trillion). 

 DDT DDE DDD Dieldrin 

No. of Samples 90 90 90 90 

Detection Frequency (%) 18% 76% 26% 22% 

Median Concentration 0.063 U 0.15 0.063 U 0.065 U 

Mean Concentration 0.077 0.21 0.072 0.091 

90th Percentile Concentration 0.10 0.43 0.094 0.15 

Maximum Concentration 0.44 J 1.3 0.22 0.29 

Endosulfan Chlorpyrifos Chlordane Alpha-BHC 

No. of Samples 90 90 90 90 

Detection Frequency (%) 49% 61% 0% 0% 

Median Concentration 0.066 U 0.18 0.063 U 0.063 U 

Mean Concentration 0.24 1.7 0.063 U 0.063 U 

90th Percentile Concentration 0.48 4.1 0.065 U 0.065 U 

Maximum Concentration 2.4 20 0.067 U 0.067 U 

U = not detected at or above reported value. 

J = estimated. 

The highest concentrations recorded were 20 ng/L for chlorpyrifos and 2.4 ng/L for endosulfan. 

Both of these insecticides are currently used in the Yakima basin. The maximum DDE 

concentration was 1.3 ng/L. Dieldrin reached 0.29 ng/L. DDT, dieldrin, chlordane, and alphaBHC were all banned in the 1970s and 1980s and are no longer used. 

Figure 19 compares the detections of DDE, dieldrin, endosulfan, and chlorpyrifos at each of the 

mainstem and Naches River monitoring sites. Results are arranged in downstream order from 

the Yakima River at Harrison Bridge (r.m. 121.7, above the city of Yakima) to the Yakima River 

at Kiona (r.m. 29.8, above the Columbia River confluence). 

DDE was always below detection limits in the Yakima River at Harrison Bridge, but was 

routinely detectable in the Naches River and all downstream locations (89-100% of samples). 

DDE, dieldrin, endosulfan, and chlorpyrifos all showed a consistent increase in detection 

frequency moving downriver from Harrison Bridge. These results point to the Naches River as 

being a larger contributor of DDT compounds than the upper Yakima River. 

Dieldrin was rarely detected at Harrison Bridge and never detected in the Naches River. The 

major dieldrin sources appear to lie downstream of Parker.
Yakima Pesticides/PCBs TMDL: Vol 1, WQ Study Findings 

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Figure 19. Detection Frequency of Selected 303(d) Listed Pesticides in the Mainstem Lower 

Yakima River and Naches River during 2007-08 (percent of samples detected, N=18). 

0%

20%

40%

60%

80%

100%

HARRISON NACHES PARKER EUCLID KIONA

Detection Frequency

DDE

0%

20%

40%

60%

80%

100%

HARRISON NACHES PARKER EUCLID KIONA

Detection Frequency

Dieldrin

0%

20%

40%

60%

80%

100%

HARRISON NACHES PARKER EUCLID KIONA

Detection Frequency

Endosulfan

0%

20%

40%

60%

80%

100%

HARRISON NACHES PARKER EUCLID KIONA

Detection Frequency

Chlorpyrifos
Yakima Pesticides/PCBs TMDL: Vol 1, WQ Study Findings 

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Major Irrigation Returns 

Table 19 summarizes the pesticide data for the four major lower river irrigation returns 

monitored in conjunction with mainstem: Moxee Drain (r.m. 107.3 near Union Gap), Granger 

Drain (r.m. 82.8 at Granger), Sulphur Creek Wasteway (r.m. 61.0 at Sunnyside), and Spring 

Creek (r.m. 41.8 below Prosser). The initial TMDL investigation identified these returns as 

priority discharges for monitoring (Joy and Patterson, 1997). 

Table 19. Summary of Results from Monitoring 303(d) Listed Pesticides in Four Major 

Irrigation Returns to the Lower Yakima River during 2007-08: Moxee Drain, Granger Drain, 

Sulphur Creek Wasteway, Spring Creek (concentrations in ng/L, parts per trillion). 

 DDT DDE DDD Dieldrin 

No. of Samples 76 76 76 76 

Detection Frequency (%) 82% 100% 97% 71% 

Median Concentration 0.19 1.2 0.22 0.16 

Mean Concentration 0.87 1.4 0.24 0.22 

90th Percentile Concentration 0.64 2.6 0.42 0.47 

Maximum Concentration 44 5.5 0.89 0.92 

Endosulfan Chlorpyrifos Chlordane Alpha-BHC 

No. of Samples 76 76 76 76 

Detection Frequency (%) 88% 87% 3% 0% 

Median Concentration 0.36 0.54 0.063 U 0.063 U 

Mean Concentration 1.2 8.1 0.063 U 0.063 U 

90th Percentile Concentration 3.2 15 0.065 U 0.065 U 

Maximum Concentration 15 211 0.082 0.095 UJ 

U = not detected at or above reported value. 

J = estimated. 

DDT compounds, dieldrin, endosulfan, and chlorpyrifos were detected much more frequently in 

the irrigation returns than in the mainstem: 71-100% vs. 18-76%. The maximum concentrations 

observed were higher in the returns by factors of 4 to 10. Chlordane was reported in only 3% of 

the return samples and alpha-BHC was never detected, which is consistent with findings for the 

mainstem. 

Despite elevated reporting limits, toxaphene was detected in four samples (5% detection 

frequency) from the major irrigation returns, two each from Moxee Drain and Sulphur Creek 

Wasteway. Estimated concentrations were in the range of 3.5 – 7.0 ng/L. Low-level data for 

toxaphene for the mainstem and major irrigation returns is discussed later this report. 

 
Yakima Pesticides/PCBs TMDL: Vol 1, WQ Study Findings 

Page 65 

The term “total DDT” refers to the summed concentrations of the insecticide DDT and its 

breakdown products DDE and DDD. A particularly high total DDT concentration of 50 ng/L 

was recorded in Granger Drain on 1/1/08. This sample was comprised of 86% un-degraded DDT 

(Figure 20). A large amount of the DDT parent compound (52%) was also found in Spring 

Creek on 4/5/07 (5.6 ng/L total DDT). Studies done elsewhere have attributed similar findings 

to disturbance of subsurface farm soils, rather than recent use of DDT (e.g., Risebrough et al., 

1984). DDT degrades more slowly when buried than when near the surface and exposed to light 

and greater biological activity (Callahan et al., 1979). The un-degraded DDT residual in 95% of 

the samples analyzed from the returns in the present study was less than 30% of the total, 

indicating the source is historical application. 

Figure 20. Percent of Un-degraded DDT in Water Samples From Four Major Irrigation Returns 

to the Lower Yakima River during 2007-08: Moxee Drain, Granger Drain, Sulfur Creek 

Wasteway, and Spring Creek. 

Pesticide detection frequency was similar among the four returns, except for dieldrin in 

Moxee Drain (Figure 21). Dieldrin was reported in only 26% of the Moxee samples, compared 

to 84-89% in the three other discharges. 

0

10

20

30

40

50

60

70

80

90

100

P

erc

e

nt D

D

T

0.0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1.0

Fraction of Data

Granger Drain 1/10/08

Spring Creek 4/5/07

Granger Drain 6/7/07

Fraction of Samples (N=76)
Yakima Pesticides/PCBs TMDL: Vol 1, WQ Study Findings 

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Figure 21. Detection Frequency of Selected 303(d) Listed Pesticides in Four Major Irrigation 

Returns to the Lower Yakima River during 2007-08 (percent of samples, N=19). 

0%

20%

40%

60%

80%

100%

MOXEE GRANGER SULPHUR SPRING

Detection Frequency

DDE

0%

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MOXEE GRANGER SULPHUR SPRING

Detection Frequency

Dieldrin

0%

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MOXEE GRANGER SULPHUR SPRING

Detection Frequency

Endosulfan

0%

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100%

MOXEE GRANGER SULPHUR SPRING

Dection Frequency

Chlorpyrifos
Yakima Pesticides/PCBs TMDL: Vol 1, WQ Study Findings 

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Comparison with Water Quality Criteria 

Human Health 

The human health criteria are intended to protect the average consumer from excess cancer and 

other health risks incurred from exposure to contaminated fish and water. People with higher or 

lower body weights and fish or water consumption rates than used to calculate the criteria would 

face higher or lower risks. As previously noted, the human health criteria were promulgated on 

the states through the EPA National Toxics Rule. Washington State does not have human health 

criteria for chlorpyrifos, none having been proposed by EPA. The water quality criteria are 

described in more detail starting on page 9.

Lower Mainstem and Naches River 

The percentage of Yakima and Naches River water samples that exceeded Washington State 

human health criteria for pesticides is shown in Table 20. The criteria shown are for 

consumption of both fish and water. In the case of DDT compounds, dieldrin, and chlordane, 

these criteria are the same as or only slightly lower than the criteria for fish consumption only 

(see Table 3). 

Table 20. Percent of Samples Exceeding Human Health Criteria for 303(d) Listed Pesticides in 

the Mainstem Lower Yakima River and Naches River during 2007-08. (N=18) 

Location DDT DDE DDD Dieldrin 

Human Health Criteria (ng/L): 0.59 0.59 0.83 0.14 

Yakima River at Harrison 0% 0% 0% 0% 

Naches River at mouth 0% 0% 0% 0% 

Yakima River at Parker 0% 0% 0% 0% 

Yakima River at Euclid 0% 17% 0% 22% 

Yakima River at Kiona 0% 6% 0% 28% 

Location Endosulfan Chlorpyrifos Chlordane Alpha BHC 

Human Health Criteria (ng/L): 930 NA 0.57 3.9 

Yakima River at Harrison 0% NA 0% 0% 

Naches River at mouth 0% NA 0% 0% 

Yakima River at Parker 0% NA 0% 0% 

Yakima River at Euclid 0% NA 0% 0% 

Yakima River at Kiona 0% NA 0% 0% 

NA = not applicable (criteria have not been adopted). 

Instances where human health criteria were exceeded in the Yakima mainstem were limited to 

DDE and dieldrin and were observed at Euclid and Kiona, but not further upstream. 17-22% of 

samples exceeded at Euclid and 6-28% of samples exceeded at Kiona. Other 303(d) listed 

pesticides were always within human health criteria in the mainstem. The Naches River never 

exceeded criteria. 
Yakima Pesticides/PCBs TMDL: Vol 1, WQ Study Findings 

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Major Irrigation Returns 

Table 21 shows how the four major lower river returns compared to human health criteria. 

Comparing the returns directly with human health criteria is appropriate for several reasons. 

First, both state and federal opinions have concluded that waters within the Columbia Basin, 

including irrigation returns, are waters of the state and therefore subject to the water quality 

standards (AGO 1969 No. 4 www.atg.wa.gov/opinion.aspx?section=archive&id=9166; 

Levigne, 1997; Ryan, 1997). Second, as demonstrated in Ecology’s 2006 fish tissue survey and 

confirmed in the 2007-08 water quality study, the Yakima River is often at or above criteria for 

several of these compounds, and thus does not have additional assimilative capacity. Third, 

some segments of the local population are known to catch fish out of irrigation returns on a 

routine basis. 

Table 21. Percent of Samples Exceeding Human Health Criteria for 303(d) Listed Pesticides in 

Four Major Irrigation Returns to the Lower Yakima River during 2007-08. (N=19) 

Location DDT DDE DDD Dieldrin 

Human Health Criteria (ng/L): 0.59 0.59 0.83 0.14 

Moxee Drain 0% 74% 0% 26% 

Granger Drain 47% 100% 5% 53% 

Sulphur Creek Wasteway 0% 100% 0% 89% 

Spring Creek 11% 32% 0% 58% 

Location Endosulfan Chlorpyrifos Chlordane Alpha BHC 

Human Health Criteria (ng/L): 930 NA 0.57 3.9 

Moxee Drain 0% NA 0% 0% 

Granger Drain 0% NA 0% 0% 

Sulphur Creek Wasteway 0% NA 0% 0% 

Spring Creek 0% NA 0% 0% 

NA = not applicable (criteria have not been adopted for chlorpyrifos). 

The returns exceeded human health criteria for DDT, DDE, and dieldrin much more frequently 

than the mainstem. Endosulfan, chlordane, and alpha-BHC, however, always remained within 

criteria. 

As illustrated in Figure 22, DDE and dieldrin typically exceeded human health criteria 50% of 

the time or more, with 100% exceedance of the DDE criterion in Granger Drain and Sulphur 

Creek Wasteway. Exceptions were DDE in Spring Creek, which exceeded 32% of the time, and 

dieldrin in Moxee Drain, which exceeded 26% of the time. Granger Drain and Spring Creek 

were the only returns where the DDT human health criterion was exceeded. As previously 

noted, these discharges had an unusually high percentage of un-degraded DDT in several 

instances. 
Yakima Pesticides/PCBs TMDL: Vol 1, WQ Study Findings 

Page 69 

Figure 22. Percent of Samples Exceeding Human Health Criteria for DDE, DDT, and Dieldrin 

in Four Major Irrigation Returns to the Lower Yakima River during 2007-08. (N=19) 

0%

20%

40%

60%

80%

100%

MOXEE GRANGER SULPHUR SPRING

Exceedance Frequency

DDE

0%

20%

40%

60%

80%

100%

MOXEE GRANGER SULPHUR SPRING

Exceedance Frequency

DDT

0%

20%

40%

60%

80%

100%

MOXEE GRANGER SULPHUR SPRING

Exceedance Frequency

Dieldrin
Yakima Pesticides/PCBs TMDL: Vol 1, WQ Study Findings 

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Aquatic Life 

Water quality criteria to protect aquatic life are typically less restrictive than the human health 

criteria, i.e., higher concentrations are considered to be protective. The aquatic life criteria for 

DDT compounds apply to total DDT, rather than the individual concentrations of DDT, DDE, or 

DDD. Human health criteria have not been proposed for total DDT. 

Lower Mainstem and Naches River 

Washington State’s aquatic life criteria for chronic (long-term) exposure to 303(d) pesticides 

were rarely exceeded in the mainstem Yakima River and never exceeded in the Naches River 

during 2007-08 (Table 22). The acute criteria (short-term exposure) were always being met. 

The chronic total DDT criterion was exceeded in 6% of the samples collected in the mainstem at 

Euclid and 6% of samples at Kiona (1 out of 18). Other pesticides were always within chronic 

criteria. 

Table 22. Percent of Samples Exceeding Chronic Aquatic Life Criteria for 303(d) Listed 

Pesticides in the Mainstem Lower Yakima River and Naches River during 2007-08. (N=18) 

Location Total DDT* Dieldrin Endosulfan 

Aquatic Life Criteria (ng/L): 1.0 1.9 56 

Yakima River at Harrison 0% 0% 0% 

Naches River at mouth 0% 0% 0% 

Yakima River at Parker 0% 0% 0% 

Yakima River at Euclid 6% 0% 0% 

Yakima River at Kiona 6% 0% 0% 

Location Chlorpyrifos Chlordane Alpha BHC 

Aquatic Life Criteria (ng/L): 41 4.3 NA 

Yakima River at Harrison 0% 0% NA 

Naches River at mouth 0% 0% NA 

Yakima River at Parker 0% 0% NA 

Yakima River at Euclid 0% 0% NA 

Yakima River at Kiona 0% 0% NA 

NA = not applicable (criteria have not been adopted). 

*Total DDT = DDT+DDE+DDD. 

Major Irrigation Returns 

Tributaries and irrigation returns to the lower Yakima River provide habitat for salmonids and 

other fish species (Joy and Patterson, 1997). They also discharge to reaches of the mainstem 

with important fish habitat. The presence of chinook, coho, and steelhead has been documented 

in Moxee Drain, Sulphur Creek Wasteway, and Spring Creek, with coho spawning observed in 

Sulphur and Spring (http://wdfw.wa.gov/mapping/salmonscape/index.html). Rearing and 

migration are specifically identified as designated uses for Sulphur Creek Wasteway in the water 
Yakima Pesticides/PCBs TMDL: Vol 1, WQ Study Findings 

Page 71 

quality standards.f It is therefore important that these discharges comply with aquatic life 

criteria. 

Total DDT commonly exceeded the chronic aquatic life criterion in all four returns, with 

Granger Drain and Sulphur Creek Wasteway exceeding throughout the year (Table 23). 

Chlorpyrifos was occasionally above the chronic criterion in Moxee Drain, Sulphur Creek 

Wasteway, and Spring Creek (5-11% of samples). Dieldrin, endosulfan, and chlordane were 

always within aquatic life criteria. There are no aquatic life criteria for alpha-BHC. 

Table 23. Percent of Samples Exceeding Chronic Aquatic Life Criteria for 303(d) Listed 

Pesticides in Four Major Irrigation Returns to the Lower Yakima River during 2007-08. (N=19) 

Location Total DDT* Dieldrin Endosulfan 

Aquatic Life Criteria (ng/L): 1.0 1.9 56 

Moxee Drain 68% 0% 0% 

Granger Drain 100% 0% 0% 

Sulphur Creek Wasteway 100% 0% 0% 

Spring Creek 26% 0% 0% 

Location Chlorpyrifos Chlordane Alpha BHC 

Aquatic Life Criteria (ng/L): 41 4.3 NA 

Moxee Drain 5% 0% NA 

Granger Drain 0% 0% NA 

Sulphur Creek Wasteway 11% 0% NA 

Spring Creek 11% 0% NA 

*DDT+DDE+DDD. 

NA = not applicable (criteria have not been adopted). 

Spatial and Seasonal Patterns 

Lower Mainstem 

Figures 23 and 24 illustrate how the average total DDT and dieldrin concentrations increased in 

the Yakima mainstem moving downstream from Harrison Bridge to Kiona during the 2007 

irrigation season. The highest levels of these compounds were generally observed during 

irrigation. Previous studies have had similar findings (Joy and Patterson, 1997; Rinella et al., 

1999; Ebbert and Embrey, 2002). 

On average, total DDT concentrations increased by a factor of 2 or more between Harrison and 

Parker. This was due, at least in part, to the Naches River and Moxee Drain. The greatest 

impacts occurred between Parker and Euclid where concentrations increased by a factor of 4. 

Granger Drain, Sulphur Creek Wasteway, and a large number of right bank tributaries and 

returns discharge to this reach. Total DDT levels at Kiona averaged about two-thirds of those 

at Euclid due to dilution and sedimentation. 

 

f

 The Roza-Sunnyside Board of Joint Control installed an adult fish barrier in lower Sulphur Creek Wasteway during 

the winter of 2007-08. 
Yakima Pesticides/PCBs TMDL: Vol 1, WQ Study Findings 

Page 72 

Dieldrin was at or below detection limits from Harrison to Parker, including in the Naches River 

and, in most cases, Moxee Drain. There did not appear to be large dieldrin sources in this reach 

of the river. Dieldrin increased by a factor of at least 2 at Euclid and then decreased slightly by 

Kiona. 

Figure 23. Average Total DDT Concentrations in the Lower Yakima River during the 2007 

Irrigation Season (ng/L = parts per trillion, concentration proportional to circle area, nondetects shown as less than 1⁄2 detection limit). 
Yakima Pesticides/PCBs TMDL: Vol 1, WQ Study Findings 

Page 73 

Figure 24. Average Dieldrin Concentrations in the Lower Yakima River during the 2007 

Irrigation Season (ng/L = parts per trillion, concentration proportional to circle area, nondetects shown as less than 1⁄2 detection limit). 

Figure 25 shows how DDE and total DDT levels varied at Euclid and Kiona from April 2007 

through March 2008. These are the two mainstem locations where water quality criteria were 

not being met consistently. The daily flow at Kiona is also shown (USGS station 12510500 

http://waterdata.usgs.gov/wa/nwis/sw). 

DDE and total DDT varied directly with discharge. The pattern corresponded to changes in 

suspended sediment and reflects the affinity these compounds have for soil particles and other 

suspended matter. The suspended sediment data are discussed later in this report. 

Concentrations of DDT compounds were similar at both locations, except during the second half 

of the irrigation season (July- October) when much lower levels were measured at Kiona. This 

can be partly attributed to dilution. Due to irrigation withdrawals, the flow at Euclid was about 

80% of the flow at Kiona during this period. Lower river velocities also cause suspended 

sediments to settle out, thereby reducing concentrations of DDT compounds in the water column. 

The low gradient reach from above Sunnyside (approximately r.m. 70) to Prosser Dam (r.m. 

47.2) is an area where deposition is known to occur (Zuroske, 2008). USGS has characterized 

this reach as a “slow-moving meandering pool” (Morace et al., 1999). 
Yakima Pesticides/PCBs TMDL: Vol 1, WQ Study Findings 

Page 74 

Figure 25. Seasonal Patterns in DDE and Total DDT at Two Sites in the Lower Mainstem 

Yakima River (ng/L= parts per trillion; non-detects plotted at the reporting limit). 

The highest DDE and total DDT concentrations were recorded during a storm event in December 

(12/4/08). Ebbert and Embrey (2002) and others have demonstrated that pesticides like DDT 

that persist in soil continue to be transported in Yakima River streams and drains throughout the 

year, especially during storm runoff or snowmelt. 

DDE was meeting the human health criterion (0.59 ng/L) at Euclid and Kiona throughout most 

the irrigation season. However, it was at or close to the criterion in June and September and 

exceeded the criterion at Euclid in early October. Concentrations fluctuated widely during the 

0

1,000

2,000

3,000

4,000

5,000

6,000

7,000

8,000

9,000

10,000

0

0.2

0.4

0.6

0.8

1

1.2

1.4

cubic feet per second

ng/L (parts per trillion)

DDE

EUCLID

KIONA

Kiona Flow

Human Health Criterion

0

1,000

2,000

3,000

4,000

5,000

6,000

7,000

8,000

9,000

10,000

0

0.2

0.4

0.6

0.8

1

1.2

1.4

1.6

1.8

2

cubic feetpersecond

ng/L (parts per trillion)

T‐DDT

EUCLID

KIONA

Kiona Flow

Aquatic Life Criterion
Yakima Pesticides/PCBs TMDL: Vol 1, WQ Study Findings 

Page 75 

winter, at which time the human health criterion was exceeded on two occasions. The river was 

at or above the chronic aquatic life criterion for total DDT (1.0 ng/L) on three occasions, once 

during irrigation and twice during the winter. 

A different pattern was observed for dieldrin, which showed an inverse relationship with flow 

(Figure 26). Concentrations increased substantially at Euclid and Kiona as flows decreased 

during the second half of the irrigation season; dieldrin then dropped to levels at or below 

detection in the fall and winter. Unlike DDT compounds, dieldrin was little affected by the 

December storm event. Thus, dieldrin appears to fluctuate primarily with the amount of 

available dilution. 

Figure 26. Seasonal Patterns in Dieldrin Concentrations at Two Sites in the Lower Mainstem 

Yakima River (ng/L= parts per trillion; non-detects plotted at the reporting limit). 

The contrasting behavior of dieldrin vs. DDT compounds is likely due to dieldrin’s greater 

solubility and lower affinity for suspended matter. Estimates obtained from the SPMD 

deployments indicate that more than 90% of the dieldrin is in dissolved form and not associated 

with particulates. The inverse relationship with flow suggests a potential groundwater 

contribution. A similar pattern was not observed in any of the four major irrigation returns, 

but has been reported for Wide Hollow Creek and attributed to subsurface flows (Johnson and 

Burke, 2006). 

The human health criterion for dieldrin (0.14 ng/L) was exceeded at Euclid at the start of the 

irrigation season and from July through September. Kiona had lower concentrations, but was at 

or slightly above the criterion on a number of occasions during the second half of the irrigation 

season and substantially exceeded it once. Dieldrin never approached the chronic aquatic life 

criterion (1.9 ng/L) at either location. 

Endosulfan and chlorpyrifos exhibited several distinct peaks associated with their application 

during the growing season (Figure 27). Concentrations were uniformly low during the winter. 

0

1,000

2,000

3,000

4,000

5,000

6,000

7,000

8,000

9,000

10,000

0

0.05

0.1

0.15

0.2

0.25

0.3

0.35

cubic feet per second

ng/L (parts per trillion)

Dieldrin

EUCLID

KIONA

Kiona Flow

Human Health

Criterion
Yakima Pesticides/PCBs TMDL: Vol 1, WQ Study Findings 

Page 76 

Figures 28 and 29 give a snapshot of the concentrations observed during the initial spike detected 

on April 4-5, 2007. At this time, concentrations in the lower river increased by more than a 

factor of 3 for endosulfan and by a factor of 10 or more for chlorpyrifos. Although neither of 

these insecticides approached water quality criteria, the timing of the maximum concentrations 

may have been missed due to the twice-a-month sampling schedule. 

Figure 27. Seasonal Patterns in Endosulfan and Chlorpyrifos Concentrations at Two Sites in the 

Lower Mainstem Yakima River (ng/L= parts per trillion; non-detects plotted at the reporting 

limit). 

0

1,000

2,000

3,000

4,000

5,000

6,000

7,000

8,000

9,000

10,000

0

0.5

1

1.5

2

2.5

3

cubic feet per second

ng/L (parts per trillion)

Endosulfan

EUCLID

KIONA

Kiona Flow

[Water quality criteria not exceeded]

0

1000

2000

3000

4000

5000

6000

7000

8000

9000

10000

0

5

10

15

20

25

cubic feet per second

ng/L (parts per trillion)

Chlorpyrifos

EUCLID

KIONA

Kiona Flow

[Water quality criteria not exceeded]
Yakima Pesticides/PCBs TMDL: Vol 1, WQ Study Findings 

Page 77 

Figure 28. Endosulfan Concentrations in the Lower Yakima River on April 4-5, 2007 

(ng/L = parts per trillion, concentration proportional to circle area, non-detects shown as less 

than 1⁄2 detection limit). 
Yakima Pesticides/PCBs TMDL: Vol 1, WQ Study Findings 

Page 78 

Figure 29. Chlorpyrifos Concentrations in the Lower Yakima River on April 4-5, 2007 

(ng/L = parts per trillion, concentration proportional to circle area). 

Major Irrigation Returns 

Time-series plots for DDE, total DDT, and dieldrin in Moxee Drain, Granger Drain, Sulphur 

Creek Wasteway, and Spring Creek are displayed in Figures 30-33. Flow data were obtained 

from USGS (http://waterdata.usgs.gov/wa/nwis) or gauged in the field (Spring Creek). In 

general, concentrations increased in the early part of the irrigation season, followed by a 

decrease into fall and winter. Sulphur Creek Wasteway showed a second period of elevated 

concentrations during winter that corresponded to increases in TSS and turbidity. 

In Moxee Drain and Spring Creek, water quality criteria violations for DDT compounds and 

dieldrin were primarily limited to the irrigation season. Granger Drain and Sulphur Creek 

Wasteway had exceedances throughout the year. 
Yakima Pesticides/PCBs TMDL: Vol 1, WQ Study Findings 

Page 79 

Figure 30. DDT Compounds and Dieldrin in Moxee Drain during 2007-08. 

0

20

40

60

80

100

120

140

0

0.2

0.4

0.6

0.8

1

1.2

1.4

1.6

1.8

2

ng/L

CFS

Moxee

DDE

Flow

human health criterion

0

20

40

60

80

100

120

140

0

0.5

1

1.5

2

2.5

3

ng/L

CFS

Moxee

T-DDT

Flow

aquatic life criterion

0

20

40

60

80

100

120

140

0

0.02

0.04

0.06

0.08

0.1

0.12

0.14

0.16

ng/L

CFS

Moxee

Dieldrin

Flow

human health          criterion
Yakima Pesticides/PCBs TMDL: Vol 1, WQ Study Findings 

Page 80 

Figure 31. DDT Compounds and Dieldrin in Granger Drain during 2007-08.

0

10

20

30

40

50

60

0

1

2

3

4

5

6

ng/L

CFS

Granger

DDE

Flow

human health criterion

0

10

20

30

40

50

60

0

2

4

6

8

10

12

ng/L

CFS

Granger

T-DDT

Flow

(50 ng/L)

aquatic life criterion

0

10

20

30

40

50

60

0

0.1

0.2

0.3

0.4

0.5

0.6

0.7

ng/L

CFS

Granger

Dieldrin

human health criterion Flow
Yakima Pesticides/PCBs TMDL: Vol 1, WQ Study Findings 

Page 81 

Figure 32. DDT Compounds and Dieldrin in Sulphur Creek Wasteway during 2007-08. 

0

100

200

300

400

500

600

700

0

0.5

1

1.5

2

2.5

3

ng/L

CFS

Sulphur

DDE

Flow

human health criterion

0

100

200

300

400

500

600

700

0

0.5

1

1.5

2

2.5

3

3.5

ng/L

CFS

Sulphur

T-DDT

Flow aquatic life criterion

0

100

200

300

400

500

600

700

0

0.1

0.2

0.3

0.4

0.5

0.6

0.7

0.8

0.9

1

ng/L

CFS

Sulphur

Dieldrin

Flow

human health criterion
Yakima Pesticides/PCBs TMDL: Vol 1, WQ Study Findings 

Page 82 

Figure 33. DDT Compounds and Dieldrin in Spring Creek during 2007-08. 

 

0

20

40

60

80

100

120

0

0.5

1

1.5

2

2.5

ng/L

CFS

Spring

DDE

human health criterion Flow

0

20

40

60

80

100

120

0

1

2

3

4

5

6

ng/L

CFS

Spring

T-DDT

Flow

aquatic life criterion

0

20

40

60

80

100

120

0

0.05

0.1

0.15

0.2

0.25

0.3

0.35

ng/L

CFS

Spring

Dieldrin

Flow

human health

criterion
Yakima Pesticides/PCBs TMDL: Vol 1, WQ Study Findings 

Page 83 

Endosulfan exhibited the same peaks seen in the mainstem, demonstrating that the returns were 

contributing sources (Figure 34). No mainstem samples were collected that corresponded to 

the late March 2008 peak seen in all four returns (3/28/08). The maximum endosulfan 

concentrations observed in the returns were always well within water quality criteria. 

Figure 34. Endosulfan and Chlorpyrifos in Four Major Irrigation Returns to the Yakima River 

during 2007-08. 

 

0

2

4

6

8

10

12

14

16

ng/L

Endosulfan

MOXEE

GRANGER

SULFUR

SPRING

[water quality criteria not exceeded]

0

50

100

150

200

250

ng/L

Chlorpyrifos

MOXEE

GRANGER

SULFUR

SPRING

chronic aquatic life criterion

acute aquatic life criterion
Yakima Pesticides/PCBs TMDL: Vol 1, WQ Study Findings 

Page 84 

The returns and the mainstem showed corresponding chlorpyrifos peaks in April. The mainstem 

peaks of August and October, however, were not seen in any of the returns, indicating there were 

other sources. The highest chlorpyrifos levels were recorded at the start of irrigation in both 

2007 and 2008, at which time the acute aquatic life criterion was exceeded in Spring Creek and, 

marginally, in Moxee Drain. 

Endosulfan and chlorpyrifos are applied during certain windows over the growing season. 

Again, peak concentrations were potentially missed with a twice-a month sampling regime. 

Ecology conducted more intensive pesticides monitoring in Sulphur Creek Wasteway and Spring 

Creek during 2007 as part of the Surface Water Monitoring Program for Pesticides in SalmonidBearing Streams (SWMP; Dugger et al., 2008). Samples were collected weekly from February 

through October. Current-use pesticides are the focus of this ongoing effort. 

 

SWMP’s chlorpyrifos data are compared to results from twice-a-month sampling in Figure 35. 

Although the present study detected the approximate timing of the chlorpyrifos peaks, it did not 

record the highest concentrations, which substantially exceeded criteria. During the remainder of 

the year, concentrations were below the SWMP reporting limit of 33 ng/L and thus not 

comparable to the present study (0.06 ng/L reporting limit). 

SWMP also monitored Sulphur Creek Wasteway and Spring Creek in previous years. Although 

chlorpyrifos levels appeared to be lower, acute or chronic aquatic life criteria were still exceeded 

during peak usage periods (Table 24). 

SWMP’s reporting limit for endosulfan is 50 ng/L. Endosulfan has not been detected at or above 

this level in either of these returns. Reporting limits for DDT compounds, dieldrin, and other 

303(d) listed pesticides analyzed by SWMP are not low enough to compare to water quality 

criteria. 

 
Yakima Pesticides/PCBs TMDL: Vol 1, WQ Study Findings 

Page 85 

Figure 35. Chlorpyrifos Concentrations in Sulphur Creek Wasteway and Spring Creek 

Compared to Results from the SWMP (Dugger et al., 2008; non-detects plotted at the reporting 

limit). 

 

0

50

100

150

200

250

300

ng/L

Chlorpyrifos in Spring Creek

SWMP

Present Study acute aquatic life criterion

chronic aquatic life criterion

0

20

40

60

80

100

120

140

160

180

ng/L

Chlorpyrifos in Sulphur Creek

SWMP

Present Study

acute aquatic life criterion

chronic aquatic life criterion
Yakima Pesticides/PCBs TMDL: Vol 1, WQ Study Findings 

Page 86 

Table 24. Summary of Chlorpyrifos Data Reported for Sulphur Creek Wasteway and Spring 

Creek by SWMP (ng/L; parts per trillion).

Year: 2007 2006 2005 2004 2003 

Monitoring Period: Feb.-Sept. March-Oct. March-Oct. April-Oct. April-Dec. 

Sulphur Creek Wasteway 

 No. of Samples 31 24 29 31 18 

 Detection Frequency 13% 29% 21% 19% 19% 

 Median Concentration 100 13 19 11 8 

 Maximum Concentration 170 100 37 47 13 

Spring Creek 

 No. of Samples 31 36 29 31 18 

 Detection Frequency 19% 31% 24% 19% 24% 

 Median Concentration 30 15 28 11 4 

 Maximum Concentration 270 60 89 77 9 

Source: Burke et al. (2006); Dugger et al. (2008). 

Pesticide Loads 

The routine monitoring data were used to calculate average loads of total DDT, dieldrin, 

endosulfan, and chlorpyrifos in the Yakima River, Naches River, and major returns during the 

2007 irrigation season (Table 25). A concentration equal to half the reporting limit was assumed 

where a pesticide was not detected. 

Table 25. Average Loads of Selected 303(d) Pesticides during the 2007 Irrigation Season 

(grams per day).

Location Mean Flow 

(cfs) Total DDT Dieldrin Endosulfan Chlorpyrifos 

Yakima River at Harrison 1,646 ~0.1 ~0.2 ~0.4 ~0.9 

Naches River at mouth 1,843 0.8 ~0.1 1.0 ~4.0 

Yakima River at Parker 2,081 0.7 ~0.2 2.2 6.4 

Yakima River at Euclid 2,657 3.2 0.6 5.2 27 

Yakima River at Kiona 3,227 3.6 0.6 4.3 36 

Moxee Drain 62 0.3 0.01 0.2 1.3 

Granger Drain 37 0.3 0.03 0.1 0.2 

Sulfur Creek Wasteway 293 1.3 0.3 1.2 2.3 

Spring Creek 46 0.2 0.02 0.1 1.0 

Note: Half the reporting limit used for non-detects. 

"~" indicates >50% of samples were below reporting limit. 

 
Yakima Pesticides/PCBs TMDL: Vol 1, WQ Study Findings 

Page 87 

Figure 36 shows the loads in downstream order. A substantial increase in loading is evident 

between Harrison Bridge and Euclid for all four pesticides, with most of the increase occurring 

between Parker and Euclid. Total DDT, dieldrin, and endosulfan loads remained about the same 

between Euclid and Kiona indicating an absence of large sources in this reach. There was 

increased chlorpyrifos loading downstream of Euclid. 

Figure 36. Average Loads of Selected 303(d) Pesticides during the 2007 Irrigation Season 

(grams per day).

0.1

0.7

3.2

3.6

0.8

0.3 0.3

1.3

0.2

0.0

0.5

1.0

1.5

2.0

2.5

3.0

3.5

4.0

grams per day

Total DDT

Mainstem

Tributaries/Returns
Yakima Pesticides/PCBs TMDL: Vol 1, WQ Study Findings 

Page 88 

Figure 36. Average Loads of Selected 303(d) Pesticides (continued). 

0.2 0.2

0.6

0.6

0.1

0.01 0.03

0.3

0.02

0.0

0.1

0.2

0.3

0.4

0.5

0.6

0.7

grams per day

Dieldrin

Mainstem

Tributaries/Returns

0.4

2.2

5.2

4.3

1.0

0.2 0.1

1.2

0.1

0.0

1.0

2.0

3.0

4.0

5.0

6.0

grams per day

Endosulfan

Mainstem

Tributaries/Returns

0.9

6.4

27

36

4.0

1.3 0.2 2.3 1.0

0

5

10

15

20

25

30

35

40

grams per day

Chlorpryrifos

Mainstem

Tributaries/Returns
Yakima Pesticides/PCBs TMDL: Vol 1, WQ Study Findings 

Page 89 

Figure 37 illustrates the relative importance of the four returns as pesticide sources during and 

after the irrigation season. On average, the combined loading of total DDT, dieldrin, and 

endosulfan potentially accounted for half to a third of the load at Kiona during irrigation. 

The returns appeared to be minor sources of chlorpyrifos, on average. The endosulfan and 

chlorpyrifos loads could be biased low due to sampling frequency, as previously described. The 

potential for the returns to affect pesticide levels in the Yakima River was much reduced after the 

end of the irrigation season. 

Figure 37. Average Combined Pesticide Loading from Moxee Drain, Granger Drain, Sulphur 

Creek Wasteway, and Spring Creek as a Percentage of the Average Load in the Yakima 

River @ Kiona during 2007-08. 

0%

10%

20%

30%

40%

50%

60%

70%

Total DDT Dieldrin Endosulfan Chlorpyrifos

Percent of Kiona Load

Irrigation Season

Non-irrigation Season
Yakima Pesticides/PCBs TMDL: Vol 1, WQ Study Findings 

Page 90 

Other Lower River Tributaries and Returns 

Twenty-three additional tributaries and irrigation returns to the lower Yakima River were 

screened for pesticides, suspended sediment, and turbidity during 2007-08. Most of these 

discharges had either never been sampled for pesticides or the samples had not been analyzed 

down to human health criteria levels. Quarterly monitoring provided results for 85 samples. 

The sampling locations were previously shown in Figure 8. 

A summary of the data for 303(d) listed pesticides is provided in Table 26. Reporting limits 

were the same as for the routine monitoring stations (0.061-0.067 ng/L, 3 ng/L for toxaphene). 

Once again, pesticides not on the 303(d) list were infrequently detected or present at low levels. 

The complete results from the screening survey are in Appendix K. 

Table 26. Summary of Results from Screening for 303(d) Listed Pesticides in 23 Tributaries and 

Irrigation Returns to the Lower Yakima River during 2007-08 (concentrations in ng/L, parts per 

trillion). 

 DDT DDE DDD Dieldrin 

No. of Samples 85 85 85 84 

Detection Frequency (%) 44% 93% 65% 46% 

Median Concentration 0.066 U 0.56 0.11 U 0.11 U 

Mean Concentration 0.24 1.0 0.21 0.25 

90th Percentile Concentration 0.63 2.8 0.48 0.55 

Maximum Concentration 1.3 6.1 1.3 1.9 

Endosulfan Chlorpyrifos Chlordane Alpha-BHC 

No. of Samples 84 84 85 85 

Detection Frequency (%) 79% 83% 7% 2% 

Median Concentration 0.33 0.65 0.063 U 0.063 U 

Mean Concentration 0.66 2.2 0.064 U 0.064 U 

90th Percentile Concentration 1.3 7.3 0.065 U 0.065 U 

Maximum Concentration 12 21 0.14 0.14 

U = not detected at or above reported value. 

Pesticide detection frequencies and concentration levels were generally similar to findings for 

Moxee Drain, Granger Drain, Sulphur Creek Wasteway, and Spring Creek. DDT and dieldrin, 

however, tended to be detected less frequently. 

DDE, total DDT, and dieldrin exceeded water quality criteria in a number of the screening 

survey discharges. Endosulfan, chlorpyrifos, chlordane, and alpha-BHC were always meeting 

criteria. Toxaphene was not detected at or above 3 ng/L. 

Figure 38 plots the DDE, total DDT, and dieldrin concentrations as a ratio of the applicable 

water quality criterion (concentration divided by criterion). Values greater than 1.0 exceed the 

criterion. The results are arranged in downstream order, starting with Selah Creek above the city 

of Yakima (r.m. 123.7) and ending with Amon Wasteway near Richland (r.m. 2.1). 
Yakima Pesticides/PCBs TMDL: Vol 1, WQ Study Findings 

Page 91 

Figure 38. Concentration:Criteria Ratios for DDT compounds and Dieldrin in 23 Tributaries and 

Irrigation Returns to the Lower Yakima River (ratios >1 exceed criterion). 

 

SELAH CK

WENAS

SELAH DCH

TAYLOR D

COWICHEE

WIDE HOL

AHTANUM

ZILLAH

EAST TOP

SUB 35

MARION

TOPP CK

COULEE

SATUS CK

SOUTH DR

DID 7

SATUS 302SATUS 303

DRAIN 31

GRANDVIEW

WAUNA

CORRAL

AMON

0

2

4

6

8

10

12

D

D

E

H: H C

rite

rio

n

DDE

SELAH CK

WENAS

SELAH DCH

TAYLOR D

COWICHEE

WIDE HOL

AHTANUM

ZILLAH

EAST TOP

SUB 35

MARION

TOPP CK

COULEE

SATUS CK

SOUTH DR

DID 7

SATUS 302SATUS 303

DRAIN 31

GRANDVIEW

WAUNA

CORRAL

AMON

0

5

10

15

Dield

rin

H: H C

rite

rio

n

Dieldrin

SELAH CK

WENAS

SELAH DCH

TAYLOR D

COWICHEE

WIDE HOL

AHTANUM

ZILLAH

EAST TOP

SUB 35

MARION

TOPP CK

COULEE

SATUS CK

SOUTH DR

DID 7

SATUS 302SATUS 303

DRAIN 31

GRANDVIEW

WAUNA

CORRAL

AMON

0

1

2

3

4

5

6

7

8

T

D- D

T

A: q

u

atic Life C

rit.

T-DDT
Yakima Pesticides/PCBs TMDL: Vol 1, WQ Study Findings 

Page 92 

Table 27 highlights those discharges where human health or chronic aquatic life criteria were 

exceeded by a factor of 2 or more in at least half of the quarterly screening samples. Ten 

discharges fall into this category. All are irrigation return or have a significant agricultural return 

flow component (Wide Hollow Creek). Because sample size for the screening survey was small, 

these results may over or underestimate the true extent of water quality criteria violations in 

individual discharges. 

Table 27. Lower Yakima River Irrigation Returns that Substantially Exceeded Human Health or 

Chronic Aquatic Life Criteria in Screening Samples Collected during 2007-08. (N=4) 

Irrigation Return 

Human Health Criteria 

Exceeded 

Chronic 

Aquatic Life Criteria 

Exceeded 

DDE Dieldrin Total DDT 

Grandview Drain   

Satus Drain #302   

Drain #31  

Selah Ditch  

Zillah Drain  

Satus Drain #303 

South Drain  

Subdrain 35  

Wide Hollow Creek 

East Toppenish Drain  

There was evidence of substantial amounts of un-degraded DDT in several of these returns 

(Table 28). As discussed elsewhere in this report, the source is assumed to be disturbance of 

subsurface soils rather than recent use. All other tributaries and drains in the screening survey 

consistently had 35% or less DDT. 

Table 28. Instances Where a High Proportion of Un-degraded DDT was Found in 2007-08 

Screening Survey Samples (DDT as percent of total DDT). 

Irrigation Return Collection Period 

May-07 Aug-07 Nov-07 Feb-08 

Satus 302 65% 65% ---- not flowing ---- 

South Drain 63% 40% 3% 3% 

Subdrain 35 60% 29% 3% 14% 

Grandview Drain 24% 32% 15% 55% 

 
Yakima Pesticides/PCBs TMDL: Vol 1, WQ Study Findings 

Page 93 

Overall, the screening survey showed water quality criteria for DDE and total DDT were 

exceeded more frequently during the irrigation season (Figure 39). Dieldrin exceeded at a 

similar rate both during and after irrigation. 

Figure 39. Percent of Samples Exceeding Human Health or Chronic Aquatic Life Criteria 

(T-DDT) in 23 Tributaries and Irrigation Returns to the Lower Yakima River during 

(May/August) and after (November/February) the 2007 Season (quarterly samples). 

 

0%

10%

20%

30%

40%

50%

60%

DDE DDT DDD Dieldrin T-DDT

Percent of Samples Exceeding Criterion

May/Aug

Nov/Feb
Yakima Pesticides/PCBs TMDL: Vol 1, WQ Study Findings 

Page 94 

Ecology’s SWMP has done intensive pesticide monitoring in Marion Drain, located on the 

Yakama Reservation (Dugger et al., 2008). The results for 2007 show two large chlorpyrifos 

peaks that were missed in the quarterly screening survey samples (Figure 40). The acute aquatic 

life criterion was exceeded on both occasions. Endosulfan was not detected in these samples at 

or above 50 ng/L. SWMP reporting limits for other 303(d) listed pesticides were not low enough 

to compare to water quality criteria. 

Figure 40. Chlorpyrifos Concentrations Measured in Marion Drain Compared to Results from 

the SWMP (Dugger et al., 2008; non-detects plotted at the reporting limit). 

In a 2005-06 study, Ecology conducted twice-a-month monitoring for dieldrin and endosulfan in 

Wide Hollow Creek which flows through Union Gap (Johnson and Burke, 2006). As in 2007-

08, Wide Hollow consistently exceeded the human health criterion for dieldrin (Figure 41). The 

chronic aquatic life criterion was also exceeded on two occasions. Peak dieldrin concentrations 

occurred after the irrigation season and showed an inverse relationship with flow and positive 

correlation with conductivity. This was attributed to subsurface drainage in the watershed. 

Endosulfan showed a spring peak in Wide Hollow associated with the treatment window in local 

orchards. Water quality criteria were not exceeded, which is consistent with the quarterly 

samples collected in 2007-08. 

0

50

100

150

200

250

300

ng/L

Chlorpyrifos in Marion Drain

SWMP

acute aquatic life criterion Present Study

chronic aquatic life criterion
Yakima Pesticides/PCBs TMDL: Vol 1, WQ Study Findings 

Page 95 

Figure 41. Results from Monitoring Dieldrin and Endosulfan in Wide Hollow Creek in 2005-06 

(Johnson and Burke, 2006). 

 

0.0

5.0

10.0

15.0

20.0

25.0

30.0

35.0

40.0

0

0.5

1

1.5

2

2.5

ng/L

CFS

Dieldrin

Flow

human health criterion

chronic aquatic life criterion

0.0

5.0

10.0

15.0

20.0

25.0

30.0

35.0

40.0

0

5

10

15

20

25

30

35

ng/L

CFS

Endosulfan

Flow

[water quality criteria not exceeded]
Yakima Pesticides/PCBs TMDL: Vol 1, WQ Study Findings 

Page 96 

The screening survey data from May and August were used to provide a rough estimate of the 

average combined loads of total DDT, dieldrin, endosulfan, and chlorpyrifos during the 2007 

irrigation season (Table 29). The loads are compared to the loads measured through more 

intensive monitoring of the four major returns. The screening survey results, although limited, 

suggest these discharges may have a comparable impact on the river. 

Table 29. Pesticide Loads from 23 Screening Survey Tributaries and Irrigation Returns 

Compared to Loads from the Four Major Returns: Moxee Drain, Granger Drain, Sulfur Creek 

Wasteway, and Spring Creek (average combined load during the 2007 irrigation season (grams 

per day).) 

Source Total DDT Dieldrin Endosulfan Chlorpyrifos 

Screening Survey 

Tributaries & Returns* 2.1 0.30 1.1 8.7 

Major Returns† 2.1 0.33 1.5 4.8 

*May and August samples. 

†April through October samples. 

 Comparison with Historical Pesticide Data 

Surface Water 

Pesticide levels in the lower Yakima River before and after the Suspended Sediment and DDT 

TMDL have been documented for 1988-89 (Rinella et al., 1993, 1999), 1992-96 (Davis, 1993; 

Davis and Johnson, 1994; Davis, 1996; Davis et al., 1998a; Joy and Patterson, 1997; Johnson and 

Burke, 2006), and 1999-2000 (Ebbert and Embrey, 2002). The analytical methods employed in 

these studies have been adequate to consistently quantify concentrations of DDT compounds, 

dieldrin, and endosulfan at a number of locations. Chlorpyrifos has been analyzed, but 

detections were sporadic. Chlordane and alpha-BHC are rarely seen in the historical water 

quality data. 

Figure 42 shows the total DDT, dieldrin, and endosulfan concentrations recorded between 1988 

and 2008 for Moxee Drain, Granger Drain, Sulphur Creek Wasteway, Wide Hollow Creek, and 

the Yakima River at Euclid and Kiona. These sites are where the most significant contamination 

has been documented. Historical detections of dieldrin and endosulfan have primarily been 

confined to irrigation returns. 

As first reported for total DDT by Fuhrer et al. (2004), there has been a significant drop in 

pesticide levels in Yakima surface water over the past 10 years. Since the TMDL effort was 

initiated, concentrations of DDT compounds, dieldrin, and endosulfan have decreased by 

one-to-two orders of magnitude (factors of 10). This can be attributed to the combined effects of 

reduced soil erosion, pesticide degradation, and, in the case of endosulfan, improved application 

practices. 
Yakima Pesticides/PCBs TMDL: Vol 1, WQ Study Findings 

Page 97 

Figure 42. Pesticide Levels in the Lower Yakima River Drainage, 1988-2008 (nondetects 

plotted as unfilled symbols). 

0

10

20

30

40

50

60

70

80

Total DDT (ng/L)

Moxee Drain

1988-89

1992-93

1999-2000

2007-08

0

20

40

60

80

100

120

140

160

180

200

Total DDT (ng/L)

Granger Drain

1988-89

1995

1999-2000

2007-08

(357 ng/L)

0

10

20

30

40

50

60

Total DDT (ng/L)

Sulphur Creek

1988-89

1995

2007-08
Yakima Pesticides/PCBs TMDL: Vol 1, WQ Study Findings 

Page 98 

Figure 42. Historical Pesticide Data (continued). 

0

1

2

3

4

5

6

7

8

9

Total DDT (ng/L)

Yakima River @ Euclid

1988

1995

2007-08

0

1

2

3

4

5

6

Total DDT (ng/L)

Yakima River @ Kiona

1988-89

1999-2000

2007-08

0

2

4

6

8

10

12

Dieldrin (ng/L)

Granger Drain

1988-89

1999-2000

2007-08

(24 ng/L)
Yakima Pesticides/PCBs TMDL: Vol 1, WQ Study Findings 

Page 99 

Figure 42. Historical Pesticide Data (continued). 

0

2

4

6

8

10

12

14

16

Dieldrin (ng/L)

Sulphur Creek

1988-89

2007-08

0

10

20

30

40

50

60

70

80

90

100

Endosulfan (ng/L)

Wide Hollow Creek

1988-89

2005-06

2007-08

0

10

20

30

40

50

60

Endosulfan (ng/L)

Moxee Drain

1988-89

2007-08

(141 ng/L)
Yakima Pesticides/PCBs TMDL: Vol 1, WQ Study Findings 

Page 100 

DDT compounds break down extremely slowly. DDT’s half-life in soil has been reported to 

reach 15-30 years (Makay et al., 1997; Edwards, 1973). Investigations in California have led to 

the conclusion that DDT is “preserved” in agricultural soils statewide (Agee, 1986; Mischke 

et al., 1985). Once discharged to surface water, the DDE breakdown product is essentially stable 

(Callahan et al., 1979). Thus, water quality improvements for DDT in the Yakima River can 

largely be attributed to soil conservation efforts initiated as a result of the TMDLs. This 

conclusion is bolstered by the accompanying decreases seen in TSS and turbidity, described later 

in this report. 

Fish Tissue 

Legacy chlorinated pesticide residues have also decreased in Yakima River fish in recent years. 

The trends, however, are not as clear-cut as in water samples. This is because of differences 

between studies in analytical methods; when and where fish were collected; the age, sex, tissues, 

and species analyzed; and fish movements within the river and its tributaries. 

Yakima River fish have been analyzed for pesticide residues by the U.S. Fish and Wildlife 

Service, USGS, EPA, and Ecology; the data are tabulated in Johnson et al. (2007). Results on 

edible tissue samples collected from the lower river since 1995 were examined for comparable 

data with respect to species, sampling location, and tissues analyzed. 

Data comparable to results from Ecology’s 2006 survey are limited to two studies which 

analyzed fillets in four species from the Toppenish-Prosser reach and one species in the 

Kiona-Horn Rapids reach (Davis et al., 1998b; EPA, 2002a). One or two composite samples 

were analyzed for each species, with five or more individual fish per composite. These data 

show a large decrease in DDE and dieldrin residues in lower Yakima River fish between 1995 

and 2006 (Figure 43). 

Fish Consumption Advisories 

In 1993, the Washington State Department of Health (WDOH) issued an advisory that 

recommended limiting consumption of bottom fish from the lower Yakima River due to the high 

levels of DDT compounds. 

WDOH evaluated Ecology’s 2006 fish tissue data and observed that DDT levels had dropped 

substantially. They determined that “the fish advisories based on DDT levels were no longer 

needed.” A news release was issued on April 30, 2009 lifting the fish consumption advisory due 

to the lower DDT levels 

In the same news release, WDOH concluded that PCB levels in carp from the lower Yakima 

River were above background levels for Washington State freshwater fish, indicating the need 

for consumers to reduce their exposure. WDOH advised that people limit consumption of 

common carp in the lower section of the river to one meal per week. The advisory applies to 

carp taken from the city of Prosser to the Yakima River mouth near Richland. 

The full text of WDOH’s news release is in Appendix L. 
Yakima Pesticides/PCBs TMDL: Vol 1, WQ Study Findings 

Page 101 

Figure 43. DDE and Dieldrin in Fillets from Lower Yakima River Fish: 1995, 1998, and 2006 

(ug/Kg = parts per billion; error bars are minimum and maximum values). 

Data from the present study on PCBs in surface water and permitted discharges in the Yakima 

basin is discussed in sections of this report that follow. 

0

200

400

600

800

1000

1200

1400

1995 2006 1998 2006 1998 2006 1995 2006 1998 2006

DDE (ug/Kg, wet)

Toppenish - Prosser Reach

Kiona - HornRapids Reach

Carp Whitefish

Sucker

Bass

Bass

0

2

4

6

8

10

12

14

16

18

20

1995 2006 1998 2006 1998 2006 1995 2006 1998 2006

Dieldrin (ug/Kg, wet)

Toppenish-Prosser Reach Kiona - Horn 

Rapids Reach

Carp

Whitefish

Sucker Bass

Bass
Yakima Pesticides/PCBs TMDL: Vol 1, WQ Study Findings 

Page 102 

PCBs and Toxaphene 

Unlike other samples collected for this study, the surface water data on PCBs and toxaphene 

were obtained by a passive sampling technique using a semipermeable membrane device 

(SPMD). This was done due to the expense and difficulty of analyzing these compounds directly 

in whole water samples. Whole surface water samples were screened for toxaphene, but at high 

detection limits. 

Although chemical concentrations derived from SPMDs usually agree closely with other types 

of more complex low-level sampling techniques, the results are calculated values based on 

experimental uptake rates and partitioning theory and should therefore be considered estimates. 

The calculation procedures are outlined in Appendix H. 

The SPMDs were deployed for approximately 30 days each during the irrigation season 

(May-June) and after the end of irrigation (October-November) at six sites on the mainstem and 

in six major tributaries and irrigation returns. In view of the 303(d) listings for PCBs in fish 

from Keechelus Lake and the Yakima Canyon, the sampling effort was extended into the upper 

Yakima River, with SPMDs placed in the mainstem at Easton, above Ellensburg, and in 

Wilson Creek. The deployment sites were previously shown in Figures 10 and 11. 

Concentrations 

The concentration estimates obtained for total PCBsg

 and toxaphene are shown in Table 30. 

The results are the total concentrations (dissolved + particulate fractions) and represent a 30-day, 

time-weighted average. Figure 44 plots the data in downstream order to illustrate spatial and 

temporal patterns; non-detects were plotted at zero. The residue and dissolved concentration 

data on which the totals are based are in Appendix M. 

During the irrigation season, PCB concentrations were two-to-four times higher in the mainstem 

lower Yakima River compared to the upper mainstem. The lower river approached the human 

health criterion (0.14 vs. 0.17 ng/L). 

The Naches River had elevated PCB levels compared to the upper Yakima River at Roza Dam, 

but during the irrigation season only. Granger Drain and Sulphur Creek Wasteway both 

appeared to be significant PCB sources, substantially exceeding the human health criterion 

during the irrigation season. The Naches River was at the human health criterion in the spring. 

Lower PCB concentrations were observed in most areas after the end of irrigation. The chronic 

aquatic life criterion for PCBs (14 ng/L) was never approached in any of these samples. 

PCBs are associated with urban/industrial applications more so than agriculture. They were used 

in closed applications (e.g., capacitor, transformers, heat transfer and hydraulic fluids) and, to a 

lesser extent, open-end applications (e.g., flame retardants, inks, adhesives, carbonless paper, 

paints, pesticide extenders, and plasticizers) (ATSDR, 2000). 

 

g

 Total PCBs is the sum of detected concentrations of the 209 individual PCB compounds analyzed. 
Yakima Pesticides/PCBs TMDL: Vol 1, WQ Study Findings 

Page 103 

In contrast to other chemicals in this study, toxaphene’s chronic aquatic life criterion is more 

restrictive than its human health criterion (0.2 ng/L vs. 0.73-0.75 ng/L). The acute aquatic life 

criterion for toxaphene, however, is relatively high at 730 ng/L. 

Table 30. Estimated PCB and Toxaphene Concentrations in the Yakima River, Tributaries, 

and Irrigation Returns during Spring and Fall 2007 (ng/L, parts per trillion). 

Location Total PCBs Toxaphene 

May-June Oct.-Nov. May-June Oct.-Nov. 

Mainstem

 Easton Dam 0.12 UJ 0.034 J 0.08 UJ 0.08 UJ

Ellensburg Water 

Co. Diversion 0.026 J 0.057 J 0.10 UJ 0.08 UJ

 Roza Dam 0.050 J 0.019 J 0.19 J 0.08 UJ

 Sunnyside Dam 0.057 J 0.011 J 0.23 J 0.10 J 

 Prosser Dam 0.14 J 0.070 J 0.31 J 0.13 J 

 Horn Rapids Dam 0.14 J 0.020 J 0.37 J 0.10 J 

Tributaries/Returns

 Wilson Creek* 0.041 J 0.039 J 0.52 J 0.13 J 

 Naches River 0.18 J 0.016 J 0.12 J 0.09 UJ

 Moxee Drain 0.078 J 0.080 J 0.73 J 0.15 J 

 Granger Drain 0.49 J 0.27 J 0.87 J 0.30 J 

 Sulphur Creek 0.80 J 0.12 J 2.9 J 0.70 J 

 Spring Creek 0.11 J 0.086 J 0.43 J 0.19 J 

*Wilson Creek PCB data for May-June are from a sample collected during same time frame in 2008. 

U = not detected at or above reported value. 

J = estimated value. 

 
Yakima Pesticides/PCBs TMDL: Vol 1, WQ Study Findings 

Page 104 

Figure 44. Estimated PCB and Toxaphene Concentrations in the Mainstem Yakima River, 

Tributaries, and Irrigation Returns during and after the 2007 Irrigation Season (non-detects 

plotted at zero). 

 

0.0

0.1

0.2

0.3

0.4

0.5

0.6

0.7

0.8

0.9

ng/L (parts per trillion)

May-June Oct.-Nov. Total PCBs 

Human Health Criterion

Upper Yakima River Lower Yakima River

0

0.5

1

1.5

2

2.5

3

3.5

ng/L (parts per trillion)

May-June Oct.-Nov. Toxaphene 

Human Health Criterion

Aquatic Life Criterion

Upper Yakima River Lower Yakima River
Yakima Pesticides/PCBs TMDL: Vol 1, WQ Study Findings 

Page 105 

Toxaphene levels gradually increased in the mainstem Yakima River moving downstream from 

Easton to Horn Rapids Dam below Kiona. During the irrigation season, toxaphene was below 

detection limits down to at least Ellensburg (Ellensburg Water Co. Diversion). Wilson Creek, 

which enters the Yakima at Ellensburg, had an elevated toxaphene concentration of 0.52 ng/L. 

Further downstream, levels rose to 0.19 ng/L at Roza Dam, and 0.23 ng/L by Sunnyside Dam 

just below the city of Yakima, slightly exceeding the chronic aquatic life criterion. Between 

Sunnyside Dam and Horn Rapids, toxaphene nearly doubled to 0.37 ng/L. After the end of the 

irrigation season, toxaphene continued to exhibit increased concentrations in the lower river, but 

remained within criteria. 

Toxaphene substantially exceeded the chronic aquatic life criterion in Wilson Creek, Moxee 

Drain, Granger Drain, and especially Sulphur Creek Wasteway. This occurred primarily during 

the irrigation season, at which time the 0.2 ng/L criterion was exceeded by a factor of 2-4 in 

Wilson Creek, Moxee Drain, and Granger Drain, and by more than a factor of 10 in Sulphur 

Creek Wasteway (2.9 ng/L). Concentrations decreased markedly in all the four drains after the 

end of irrigation, but remained elevated in Sulphur Creek, exceeding the criterion by a factor of 

3. Toxaphene was at or above the human health criterion in three of these returns. 

As previously noted, toxaphene was also detected in whole water samples from Moxee Drain 

and Sulphur Creek Wasteway during routine monitoring water quality monitoring. The Moxee 

Drain detections were estimated at 3.5 and 7.0 ng/L on 5/2/07 and 5/23/07, respectively. The 

Sulphur Creek Wasteway detections were estimated at 4.3 and 4.1 ng/L on 5/24/07 and 7/24/07, 

respectively. These concentrations are much higher than the average values seen in the SPMDs. 

All other whole water samples from these drains were below the reporting limit of 3 ng/L. 

Toxaphene is primarily an agricultural chemical, once used on cotton, fruit, vegetables, small 

grains, and livestock (ATSDR, 1996). 80-85% of the toxaphene produced in the U.S. was used 

on cotton or soybeans in the southeast U.S. Its secondary major use for parasite control on 

livestock may be noteworthy in connection with the high toxaphene levels in Sulphur Creek 

Wasteway. The Sulfur Creek drainage has a particularly high concentration of dairies and 

feedlots, with approximately 150 confined animal feeding operations (Carmack, 2008). Many 

of these were in existence prior to the ban on toxaphene in 1990. 

No low-level data were obtained on PCB or toxaphene levels in the Yakima basin surface water 

from December through April. Results from stormwater sampling, described later in this report, 

suggest there is potential for elevated concentrations during this period. Due to the expense and 

difficulty of analyzing these chemicals, there are no useful data on historical levels of PCBs or 

toxaphene in Yakima surface water. 

The PCB and toxaphene concentrations measured in the Yakima mainstem were lower than 

would be predicted from the fish samples Ecology collected the previous year. Total PCBs 

exceeded the human health criterion in most of the fish species analyzed in 2006. Toxaphene 

exceeded the human health criterion in some lower river species. In the two sets of SPMD 

samples analyzed in 2007, several tributaries exceeded human health criteria for PCBs and 

toxaphene, but the mainstem did not exceed for human health. 
Yakima Pesticides/PCBs TMDL: Vol 1, WQ Study Findings 

Page 106 

Several factors contribute to this apparent discrepancy. First, 2007 was preceded by several 

years of lower than average streamflows which affords less dilution for PCBs and toxaphene 

discharges. Second, the 2007 results do not include the winter or early spring when there is 

potential for elevated PCB and toxaphene levels. Third, the EPA bioconcentration factors 

(BCFs) used to calculate the human heath criteria are based on fish uptake from water only. 

Food is known to be an especially important pathway for PCBs (Mackay and Fraser, 2000). 

Finally, the EPA BCFs are national averages that do not necessarily correspond closely to the 

BCF for every fish species and location. 

Loads 

Table 31 has estimates of PCB and toxaphene loads in the Yakima River during the first part of 

the irrigation season (May-June SPMD data). The calculations are based on the average flow 

during the deployment period. Flow data were obtained from the USBR Yakima Hydromet 

website (www.usbr.gov/pn/hydromet/yakima/yakwebarcread.html), USGS website 

(http://waterdata.usgs.gov/wa/nwis), or gauged in the field (Spring Creek). Half the reporting 

limit was used where a chemical was not detected. Figure 45 shows the loads plotted in 

downstream order from Easton to Horn Rapids. 

Table 31. Estimates of PCB and Toxaphene Loads during May-June 2007 (grams per day). 

Location Average Flow Total 

PCBs Toxaphene (cfs) 

Mainstem 

 Easton Dam 936 ~0.14† ~0.09†

 Ellensburg Water Co. Diversion 4,290 0.28 ~0.50†

 Roza Dam 2,676 0.33 1.2 

 Sunnyside Dam 5,143 0.72 2.9 

 Prosser Dam 4,465 1.5 3.4 

 Horn Rapids Dam 5,519 1.9 5.0 

Tributaries/Returns 

 Wilson Creek 545/556* 0.06 0.70 

 Naches River 3,590 1.6 1.1 

 Moxee Drain 76 0.01 0.14 

 Granger Drain 26 0.03 0.06 

 Sulphur Cr. Wasteway 247 0.48 1.8 

 Spring Creek 56 0.02 0.05 

*In Wilson Creek, PCB data are for 2008 (556 cfs); toxaphene data are for 2007 (545 cfs). 

†Not detected; load calculated at half the reporting limit. 
Yakima Pesticides/PCBs TMDL: Vol 1, WQ Study Findings 

Page 107 

Figure 45. Estimates of PCB and Toxaphene Loads in the Yakima River during May-June, 2007 

(nondetects plotted at half the detection limit, see Table 31). 

Mainstem loads of PCBs and toxaphene increased substantially in the lower river. The PCB 

loads from the Naches River and Sulphur Creek Wasteway stand out among lower river sources. 

Sulphur Creek also carried a large toxaphene load compared to the mainstem. The toxaphene 

load in the Naches River was comparable to the load from the upper Yakima River. The 

relatively high PCB and toxaphene loads in the Naches are more by virtue of flow than 

concentration. 

0.14 0.28 0.33

0.72

1.5

1.9

0.06

1.6

0.01 0.03

0.48

0.02

0.0

0.4

0.8

1.2

1.6

2.0

grams per day

Mainstem Tributaries/Returns

Total PCBs

0.09 0.50

1.2

2.9

3.4

5.0

0.70 1.1

0.14 0.06

1.8

0.05

0.0

1.0

2.0

3.0

4.0

5.0

6.0

grams per day

Mainstem Tributaries/Returns

Toxaphene
Yakima Pesticides/PCBs TMDL: Vol 1, WQ Study Findings 

Page 108 

Suspended Sediment 

Concentrations 

This study analyzed suspended sediment as TSS. Routine monitoring results for TSS in surface 

water are summarized in Table 32 for the 2007 irrigation season, which was the focus of 

sampling effort. The complete data are in Appendix J. 

Table 32. Summary of Results from Monitoring Suspended Sediment (TSS) in the Lower 

Yakima River during the 2007 Irrigation Season (mg/L, parts per million; N=13). 

Location Median Mean 90th 

Percentile Maximum

Mainstem 

 Yakima River at Harrison 10 11 17 24 

 Yakima River at Parker 10 12 16 27 

 Yakima River at Euclid 14 23 54 67 

 Yakima River at Kiona 11 19 42 76 

Tributaries 

 Naches River 7 9 14 29 

 Moxee Drain 61 73 124 139 

 Granger Drain 27 67 163 180 

 Sulphur Creek Wasteway 26 35 73 80 

 Spring Creek 14 37 85 218 

Figure 46 plots the individual TSS results for the lower Yakima mainstem for April 2007 

through March 2008. TSS varied directly with flow. Except for the December storm event, the 

highest concentrations occurred during the first half of the irrigation season. Numerous other 

studies have shown that suspended sediment in the Yakima River is linked to the irrigation cycle. 

After irrigation, TSS levels were generally low in the mainstem, except for the December storm 

when a concentration of 342 mg/L was recorded at Euclid. The storm samples were taken over a 

two-day period (12/4-5/08) and not timed to make the results directly comparable among sites. 

The Harrison TSS sample (6 mg/L) was collected before the storm began to affect the river. 
Yakima Pesticides/PCBs TMDL: Vol 1, WQ Study Findings 

Page 109 

Figure 46. Total Suspended Solids Concentrations in the Mainstem Lower Yakima River during 

2007-08, Showing the Flow at Kiona. 

0

1000

2000

3000

4000

5000

6000

7000

8000

9000

10000

0

50

100

150

200

250

300

350

400

Flow (cfs)

TSS (mg/L)

Parker

Euclid

Kiona

Harrison

Kiona Flow

Irrigation Season (see detail below)

0

1000

2000

3000

4000

5000

6000

7000

8000

9000

10000

0

10

20

30

40

50

60

70

80

Flow (cfs)

TSS (mg/L)

Parker

Euclid

Kiona

Harrison

Kiona Flow

Irrigation Season
Yakima Pesticides/PCBs TMDL: Vol 1, WQ Study Findings 

Page 110 

Figure 47 illustrates the average TSS concentrations during the 2007 irrigation season. TSS 

levels at Harrison and the Naches River were generally similar and increased only slightly by 

Parker. As with other water quality parameters, the major TSS impacts to the river occurred 

between Parker and Euclid. On average, TSS concentrations in the Yakima River at Euclid 

(23 mg/L) and at Kiona (19 mg/L) were higher than Harrison (11 mg/L) by about a factor of 2. 

Maximum TSS levels were recorded on June 6-7, at which time the downstream increase in TSS 

was by about a factor of 3 (from 24 mg/L to 76 mg/L) (Figure 48 ). 

Figure 47. Average Total Suspended Solids Concentrations in the Lower Yakima River during 

the 2007 Irrigation Season (mg/L = parts per million; concentrations proportional to circle 

area). 
Yakima Pesticides/PCBs TMDL: Vol 1, WQ Study Findings 

Page 111 

Figure 48. Average Total Suspended Solids Concentrations in the Lower Yakima River on June 

6-7, 2007 (mg/L = parts per million; concentrations proportional to circle area). 

The TSS concentrations measured in the four major returns during 2007-08 are plotted in 

Figure 49. The highest levels, approaching or exceeding 100 mg/L, occurred when water was 

being applied to fields early in the irrigation season. Concentrations decreased substantially as 

the growing season progressed, often dropping to levels at or below those seen during the winter. 

TSS was elevated in Granger Drain and Sulphur Creek Wasteway on several occasions during 

the winter, even though flows were low. Weather records and field notes indicate snow or rain 

around the time these samples were collected. 
Yakima Pesticides/PCBs TMDL: Vol 1, WQ Study Findings 

Page 112 

Figure 49. Total Suspended Solids and Flow in Major Lower Yakima River Irrigation Returns 

during 2007-08. 

0

20

40

60

80

100

120

140

0

20

40

60

80

100

120

140

160

Flow (cfs)

TSS (mg/L)

TSS

Flow

Moxee

0

10

20

30

40

50

60

0

50

100

150

200

Flow (cfs)

TSS (mg/L)

TSS

Flow

Granger

0

100

200

300

400

500

600

700

0

10

20

30

40

50

60

70

80

90

Flow (cfs)

TSS (mg/L)

TSS

Flow

Sulphur

0

20

40

60

80

100

120

0

50

100

150

200

250

Flow (cfs)

TSS (mg/L)

TSS

Flow

Spring
Yakima Pesticides/PCBs TMDL: Vol 1, WQ Study Findings 

Page 113 

Loads 

Beales ratio estimator (Dolan et al., 1981) was used to calculate suspended sediment loads for 

the 2007 irrigation season (Table 33, Figure 50). The Beales method uses the ratio of the load to 

the flow on sampled days, adjusted by the mean flow for that time period (from continuous flow 

data) to estimate the mean load over the period of interest. This weighting approach avoids 

missing major components of the load during times when TSS was not measured. Flow data for 

the calculations were obtained from the USBR (www.usbr.gov/pn/hydromet/) and USGS 

(http://waterdata.usgs.gov/wa/nwis/sw) websites. 

The Beales method was used in the two previous Yakima River suspended sediment and 

pesticide TMDLs. Beales estimator is not appropriate for the pesticide data because it was not 

always closely correlated with flow. 

Suspended sediment data were not obtained on the Roza Power Return (from the diversion at 

Roza Dam above Harrison), the Wapato Canal Diversion, or the Sunnyside Canal Diversion, 

all of which are located between the Naches River and Parker. A significant portion of the 

mainstem flow is diverted into the Wapato and Sunnyside canals (up to 1,000 to 2,000 cfs, 

respectively). Therefore the suspended sediment load calculated for Parker cannot be directly 

compared to the combined load from the Yakima River at Harrison and the Naches River. 

Previous studies concluded the load from the Roza Return was a third to half the load in the 

Naches River (Joy and Patterson, 1997; Morace et al., 1999). 

Table 33. Estimates of Suspended Sediment Loads in the Mainstem Yakima River, Naches 

River, and Major Irrigation Returns during the 2007 Irrigation Season. 

Location Average Flow 

(cfs) 

Tons 

per Day 

Tons 

per Season 

Yakima River at Harrison 1,566 58 12,320 

Naches River at mouth 1,818 66 14,072 

Yakima River at Parker 1,945 89 18,886 

Yakima River at Euclid 2,603 263 55,718 

Yakima River at Kiona 2,906 236 49,974 

Moxee Drain 63 13 2,810 

Granger Drain 37 5 1,149 

Sulphur Creek Wasteway 306 30 6,449 

Spring Creek 46 5 1,161 
Yakima Pesticides/PCBs TMDL: Vol 1, WQ Study Findings 

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Figure 50. Estimates of Suspended Sediment Loads in the Lower Yakima River during the 2007 

Irrigation Season. 

The suspended sediment load in Moxee Drain (13 tons per day) was 15% of the Parker load 

(89 tons per day). Loading between Parker and Euclid increased three-fold, from 89 tons per day 

to 263 tons per day (18, 886 vs. 55,718 tons over the entire irrigation season). The combined 

loading from Granger Drain (5 tons per day) and Sulphur Creek Wasteway (30 tons per day) 

accounted for 35 tons per day to this reach (7,598 tons for the season). Therefore, roughly 20% 

of the increased loading can be attributed to Granger Drain and Sulphur Creek Wasteway. The 

remaining 80% was from other sources. USGS attributed a large portion of the suspended 

sediment load to right-bank tributaries and returns that flow through the Yakama Reservation 

(Morace et al., 1999). 

There was a net suspended sediment loss of approximately 10% between Euclid and Kiona 

(27 tons per day; 5,700 tons per season). Earlier studies estimated losses of 50-150 tons per day 

to this reach (Joy and Patterson, 1997; Morace, 1999) and attributed it to sedimentation brought 

about by the reduced channel velocities between Sunnyside and Prosser. A small portion of the 

loss can also be attributed to the Kennewick Irrigation District and Kiona Canal diversions 

(<300 cfs) above Kiona. 

The Yakima River at Kiona was transporting approximately 240 tons of suspended sediment per 

day or about 50,000 tons over the 2007 irrigation season. Under similar conditions of water 

supply during the 1995 irrigation season, the suspended sediment load at Kiona was estimated to 

have been more than twice that at 574 tons per day (Joy and Patterson, 1997). 

Only two sets of samples (May and August) were collected from other lower Yakima River 

tributaries and returns during the 2007 irrigation season (Appendix K). Based on these limited 

data, the average combined TSS load was 48 pounds per day, which is comparable to the 

combined load of 53 pounds per day from Moxee Drain, Granger Drain, Sulphur Creek 

58

89

263

236

66

13 5

30

5

0

50

100

150

200

250

300

Tons per Day

Mainstem Tributaries/Returns
Yakima Pesticides/PCBs TMDL: Vol 1, WQ Study Findings 

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Wasteway, and Spring Creek. Thus, these other discharges appear to contribute a significant 

share of the sediment load. 

These results give an incomplete picture of suspended sediment sources and transport in the 

lower Yakima River drainage. Detailed mass balances for sediment can be found in the above 

referenced reports and in Ebbert et al. (2002). 

Volatile Suspended Solids 

Improved water clarity in the lower Yakima River has led to increased growth of algae and 

aquatic plants in recent years. Algae and plant fragments form part of the TSS load. A large 

contribution could potentially lead to the wrong conclusion about suspended sediment sources 

and reasons for noncompliance with turbidity criteria and TMDL targets. 

An analysis for total non-volatile suspended solids (TNVSS) was therefore included in the 2007-

08 water quality study to assess the relative importance of plant-derived material in the lower 

mainstem. Volatile solids (TSS minus TNVSS) were assumed to represent algae and plant 

fragments. The results are summarized as percent volatile solids in Table 34. 

Table 34. Volatile Solids as Percent of Total Suspended Solids in the Yakima River, Naches 

River, and Four Major Irrigation Returns, 2007-08. 

Location N= Mean 

Yakima River at Harrison 18 25% 

Naches River 18 21% 

Yakima River at Parker 18 18% 

Yakima River at Euclid 18 16% 

Yakima River at Kiona 18 16% 

Granger Drain 19 11% 

Moxee Drain 19 17% 

Sulfur Creek Wasteway 19 12% 

Spring Creek 19 18% 

On average, there was a decrease in relative amounts of volatile solids moving downstream from 

Harrison Bridge to Kiona, suggesting that algae and plant fragments were a progressively less 

important part of the suspended sediment load. The volatile solids fraction in the four major 

irrigation returns was similar to or slightly less than the mainstem at Parker, Euclid, and Kiona. 

There were no significant differences among sites (Kruskal-Wallis test). Thus, aquatic growths 

did not appear to be an important factor to take into account in assessing suspended sediment 

sources and impacts to the Yakima River. 
Yakima Pesticides/PCBs TMDL: Vol 1, WQ Study Findings 

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Turbidity 

Turbidity was analyzed in conjunction with TSS. The turbidity results for the 2007 irrigation 

season are summarized in Table 35. As with TSS, turbidity levels were generally low after the 

end of irrigation. The individual turbidity data are in Appendix J and K. 

Table 35. Summary of Results from Monitoring Turbidity in the Lower Yakima River during 

the 2007 Irrigation Season (NTU, nephelometric turbidity units; N=13). 

Location Median Mean 90th 

Percentile Maximum 

Mainstem 

 Yakima River at Harrison 4.2 5.1 7.6 12 

 Yakima River at Parker 5.3 6.6 11 17 

 Yakima River at Euclid 7.4 10 22 27 

 Yakima River at Kiona 4.2 8.7 19 32 

Tributaries/Returns 

 Naches River 6.6 7.6 12 17 

 Moxee Drain 16 17 22 33 

 Granger Drain 12 22 41 60 

 Sulphur Creek Wasteway 9.4 12 18 25 

 Spring Creek 5.4 12 31 50 

Turbidity Criteria and TMDL Targets 

The adverse effects of suspended sediment on fish and wildlife, water supplies, and aesthetic 

enjoyment are addressed through Washington State’s turbidity criteria. Turbidity is caused by 

the presence of suspended matter such as clay, silt, finely divided organic and inorganic matter, 

and microscopic organisms. 

As previously described, the Lower Yakima River Suspended Sediment and DDT TMDL set a 

schedule for meeting numeric turbidity targets in the mainstem, tributaries, and irrigation returns. 

Milestones to be achieved by 2007 include the following: 

 By 2002: “The Yakima River mainstem will comply with the turbidity target of not more 

than a 5 NTU increase between the confluence of the Yakima and Naches Rivers and the 

Van Giesan Road bridge at West Richland (RM 8.4).” 

 By 2007: “The mouths of all tributaries and drains, and all points within all basin tributaries 

and drains, will comply with the 90th percentile turbidity target of 25 NTU.” 

The mainstem turbidity target was based on the criteria in the state standards. The criteria state 

that turbidity shall not exceed 5 NTU over background when turbidities are 50 NTU or less. 

When background turbidity is more the 50 NTU, no more than a 10% increase is allowed. 

The 25 NTU target for tributaries and drains was intended to protect fish and other aquatic 

organisms, and to assist in compliance with the turbidity target for the mainstem. 25 NTU was 
Yakima Pesticides/PCBs TMDL: Vol 1, WQ Study Findings 

Page 117 

derived from a review of EPA guidance, recommendations by the National Academy of 

Sciences, Idaho’s turbidity criteria, and the scientific literature. The 90th percentile is the 

concentration exceeded by no more than 10% of samples. The 25 NTU target was to be applied 

to the irrigation season. 

Joy and Patterson (1997) assessed the turbidity background in the lower Yakima River during the 

1994 and 1995 irrigation seasons by calculating the 90th percentile below the confluence of the 

Yakima and Naches Rivers. The 90th percentile allows for seasonal variability, supports full 

beneficial use protection under EPA policy (EPA, 1995), and is adequate for background 

definition under Ecology policy (Ecology, 1996). Background turbidity was calculated in the 

same way for the 2007-08 water quality study. Coffin et al. (2006) reported background 

turbidity during TMDL effectiveness monitoring over the 2003 irrigation season, but based it on 

samples collected at Terrace Heights Bridge below the Naches River confluence. These four 

separate determinations of the turbidity background for the lower Yakima River are compared in 

Table 36. 

Table 36. Background Turbidity (90th percentile) in the Lower Yakima River: Previous TMDL, 

Effectiveness Monitoring, and Present Study. 

Year Background 

Turbidity 

Background 

+5 NTU Data Source

1994 irrigation season* 5 NTU 10 NTU Joy & Patterson (1997) 

1995 irrigation season* 9 NTU 14 NTU Joy & Patterson (1997) 

2003 irrigation season† 10 NTU 15 NTU Coffin et al. (2006) 

2007 irrigation season** 10 NTU 15 NTU present study 

*June-October samples. †

4/16/03 - 10/15/03 samples. 

**4/4/07 - 10/3/07 samples. 

During the irrigation season, background turbidity in the lower Yakima River was 5 NTU in 

1994, 9 NTU in 1995, and 10 NTU in 2003 and 2007. Less turbidity was experienced in 1994 

because river flows were down due to low water supply. Turbidity was essentially the same 

(9 -10 NTU) during the 1995, 2003, and 2007 irrigation seasons, when flows were comparable 

and closer to normal. The 1994 and 1995 results might have been higher if the turbidity 

measurements had included April and May, as in 2003 and 2007. 

Figure 51 shows the individual turbidity measurements in the lower Yakima River at Parker, 

Euclid, and Kiona during 2007-08. The results are compared to the 5 NTU increase over 

background allowed in the turbidity criteria and set as the TMDL target. Because background 

turbidity exceeded 50 NTU during the December storm event, the criterion for those results was 

set for a 10% increase above background. 
Yakima Pesticides/PCBs TMDL: Vol 1, WQ Study Findings 

Page 118 

Figure 51. Turbidity in the Lower Yakima River during 2007-08 Compared to the State 

Turbidity Criteria and 2002 TMDL Target.

Failure to meet the turbidity target in 2007-08 was primarily confined to the first half of the 

irrigation season and limited to the Yakima River at Euclid and Kiona. The Yakima was always 

meeting the target at Parker. As with suspended sediment, the area where most of the turbidity 

increase occurred was between Parker and Euclid. Table 37 summarizes how often turbidity 

exceeded the TMDL target in the lower Yakima River during 2007-08. 

 

0

20

40

60

80

100

120

140

160

180

NTU

TMDL Target

Euclid

Kiona

Parker

Irrigation Season (see detailbelow)

0

5

10

15

20

25

30

35

NTU

TMDL Target

Euclid

Kiona

Parker

Irrigation Season
Yakima Pesticides/PCBs TMDL: Vol 1, WQ Study Findings 

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Table 37. Percent of Samples Exceeding the Existing TMDL Turbidity Target in the Mainstem 

Lower Yakima River during 2007-08. 

Time Period 

Percent of Samples 

Exceeding 

Parker Euclid Kiona 

2007 Irrigation Season (n=13) 0% 23% 23% 

November 07-March 08 (n=5) 0% 40% 20% 

2007-08 overall (n=18) 0% 28% 22% 

The 40% exceedance of the turbidity target at Euclid during the winter may overstate the extent 

of the problem. The two samples in question were only marginally above the target (7.7 vs. 

6.0 NTU in February and 11 vs. 9.0 NTU in March). Note, however, that sample size during the 

winter months was small (N=5) and turbidity events may have been missed. 

Compliance of the four major returns with the TMDL 90th percentile 25 NTU target for lower 

Yakima River tributaries and drains is illustrated in Figure 52. During the 2007 irrigation 

season, the 90th percentile turbidities in Moxee Drain and Sulphur Creek Wasteway were well 

within the target (22 and 18 NTU, respectively). Granger Drain and, to a lesser extent, 

Spring Creek exceeded the target (41 and 31 NTU, respectively). Additional turbidity data on 

these returns for 2007 is discussed starting on page 121. 

Figure 52. Compliance with the 90th Percentile 25 NTU Turbidity Target in Four Major 

Irrigation Returns to the Lower Yakima River during the 2007 Irrigation Season. (N=13)

The March 2008 results are not included in Figure 52. A turbidity reading of 90 NTU was 

recorded in Granger Drain on March 28 at the start of the 2008 irrigation season, substantially 

exceeding the 25 NTU TMDL target. Turbidity in the three other returns ranged from 

13-28 NTU on that date. 

0

5

10

15

20

25

30

35

40

45

Moxee 

Drain

Granger 

Drain

Sulphur 

Creek 

Spring 

Creek

Turbidity (NTU)

Median

90th Percentile

2007 TMDL Target

2007 Irrigation Season

(4/4-10/4 samples)
Yakima Pesticides/PCBs TMDL: Vol 1, WQ Study Findings 

Page 120 

One significant difference between Sulphur Creek Wasteway and Granger Drain is that 

Sulphur Creek receives major operational spills from both the Roza and Sunnyside canals, while 

Granger receives only minor spills from laterals and individual deliveries (Zuroske, 2004). 

Spill water is unused canal water, typically low in suspended sediment. Spring Creek also 

receives occasional operational spills (Joy and Patterson, 1997). 

Figure 53 shows how turbidity levels fluctuated in the four returns over the course of the 2007 

irrigation season into March 2008. Exceedances of 25 NTU were associated with periods of 

increasing flow, most notably during the early irrigation season. The results for Granger Drain 

suggest the 25 NTU target was chronically exceeded from April through June, whereas the 

exceedances appeared to be more sporadic in the other returns. 

 

Figure 53. Turbidity and Flow in Four Major Lower Yakima River Irrigation Returns during 

2007-08.

0

20

40

60

80

100

120

140

0

5

10

15

20

25

30

35

Flow (cfs)

Turbidity (NTU)

Turbidity

Flow

Moxee

2007 Turbidity Target

0

10

20

30

40

50

60

0

10

20

30

40

50

60

70

80

90

100

Flow (cfs)

Turbidity (NTU)

Turbidity

Flow

Granger

2007 Turbidity 

Target
Yakima Pesticides/PCBs TMDL: Vol 1, WQ Study Findings 

Page 121 

Figure 53. (continued). 

Consistent with TSS, turbidity was elevated in Sulphur Creek Wasteway on several occasions 

during the winter, even though flows were low. A similar but more modest turbidity increase 

was also seen in Granger Drain. As previously noted, there was snow or rain around the time 

these samples were collected. 

The Roza-Sunnyside Board of Joint Control (RSBOJC) also monitored turbidity in Granger 

Drain, Sulphur Creek Wasteway, Spring Creek, and Snipes Creek (a Spring Creek tributary) 

during 2007-08. The RSBOJC Water Quality Laboratory has been collecting samples at these 

locations since 1997, twice a month during the irrigation season and monthly during the 

non-irrigation season. 

 

0

100

200

300

400

500

600

700

0

5

10

15

20

25

30

Flow (cfs)

Turbidity (NTU)

Turbidity

Flow

Sulphur 2007 Turbidity Target

0

20

40

60

80

100

120

0

10

20

30

40

50

60

Flow (cfs)

Turbidity (NTU)

Turbidity

Flow

Spring

Turbidity Target for 2007
Yakima Pesticides/PCBs TMDL: Vol 1, WQ Study Findings 

Page 122 

The RSBOJC turbidity data that correspond to the monitoring Ecology did in Granger Drain and 

Sulphur Creek Wasteway during the 2007-08 water quality study are plotted in Figure 54. The 

data on all five returns for the 2007 irrigation season are compared in Table 38. 

Figure 54. Comparison of Turbidity Data Collected by Ecology and the Roza-Sunnyside Board 

of Joint Control during 2007-08 (unpublished RSBOJC data provided by Elaine Brouillard).

0

10

20

30

40

50

60

70

Turbidity (NTU)

Ecology RSBOJC

Granger Drain

0

5

10

15

20

25

30

35

40

Turbidity (NTU)

Ecology RSBOJC

Sulphur Creek Wasteway
Yakima Pesticides/PCBs TMDL: Vol 1, WQ Study Findings 

Page 123 

Table 38. Comparison of Turbidity Data Collected by Ecology and the Roza-Sunnyside 

Board of Joint Control during the 2007 Irrigation Season (NTU). 

Granger Drain Sulphur Cr. 

Wasteway

Spring Cr. 

at mouth 

Spring Cr. 

ab. Snipes Snipes Cr.

Ecology RSBOJC Ecology RSBOJC Ecology RSBOJC RSBOJC 

N = 14 14 14 13 14 14 14 

Minimum 5.2 6.8 3.9 6.1 2.9 2.9 1.5 

Median 12 15 9.4 11 5.4 6.8 4.4 

Mean 22 25 12 12 12 8.9 9.6 

90th 41 48 18 20 31 15 21 

Maximum 60 56 25 25 50 21 58 

(Unpublished RSBOJC data provided by Elaine Brouillard.) 

Except for a few instances when peak turbidity levels occurred on different days, the results for 

Granger Drain and Sulphur Creek Wasteway are in good agreement and not significantly 

different (K-S two sample test, p>0.3). For the 2007 irrigation season, both data sets concur in 

finding that Granger Drain exceeded the 90th percentile TMDL turbidity target of 25 NTU and 

that Sulphur Creek Wasteway was meeting the target. 

Ecology’s monitoring site for Spring Creek was near its point of discharge to the Yakima River 

and below its confluence with Snipes Creek. RSBOJC monitors Spring and Snipes Creeks 

separately. Ecology recorded two elevated turbidity readings (50 and 33 NTU) for lower Spring 

Creek in late May (5/24) and early June (6/7) of 2007. These two values were sufficiently high 

to raise the 90th percentile in Ecology’s data set to 31 NTU, which exceeds the 25 NTU target. 

RSBOJC sampled Spring and Snipes Creeks two days earlier (5/22 and 6/05). Turbidity was low 

in Spring Creek on both days, but high in Snipes Creek on 6/05 (58 NTU). The 90th percentile 

turbidities in RSBOJC’s data for the 2007 irrigation season were 15 and 21 NTU, respectively, 

for Spring and Snipes Creeks. Thus, based on RSBOJC’s results both returns were meeting the 

TMDL turbidity target. Taken in their entirety, the combined Ecology and RSBOJC data 

indicate the Spring Creek discharge to the Yakima River was meeting the 25 NTU turbidity 

target during the 2007 irrigation season. 

Table 39 summarizes Ecology’s turbidity findings and TMDL target compliance for 2007-08 for 

the lower Yakima River, incorporating RSBOJC’s findings for Spring and Snipes Creeks in the 

conclusions. 

The turbidity data for the 23 other lower river tributaries and returns from Ecology’s 2007-08 

screening survey are plotted in Figure 55. Only one set of samples was collected during the 

spring when turbidity is typically the highest. Satus 302 (42 and 80 NTU), South Drain (39 

NTU), and DID #7 (35 NTU) exceeded the 25 NTU target during the irrigation season. Elevated 

turbidity was also recorded in the winter in Selah Creek and, marginally, in Selah Ditch. Selah 

Creek is an intermittent stream. The single sample collected here was taken during a period of 

snowmelt. 
Yakima Pesticides/PCBs TMDL: Vol 1, WQ Study Findings 

Page 124 

Table 39. Compliance with Turbidity Criteria and TMDL Targets in the Lower Yakima River 

Drainage during 2007-08. 

Waterbody Meeting 

Criteria/Target? 

Yakima at Parker Yes 

Yakima at Euclid No 

Yakima at Kiona No 

Naches River Yes 

Moxee Drain Yes 

Granger Drain No 

Sulphur Creek Wasteway Yes 

Spring Creek Yes 

Figure 55. Turbidity in Screening Survey Samples from 23 Other Tributaries and Irrigation 

Returns to the Lower Yakima River during 2007-08. 

Additional turbidity data for a number of the tributaries and returns from the screening survey 

have been collected by the Yakama Nation, Conservation Districts, Yakima Area Creeks 

Bacteria TMDL, and USGS. These data were not reviewed for the present report. 

0

10

20

30

40

50

60

70

80

90

T

urbidity (

N

T

U)

0.0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1.0

Percent of Samples (n=85)

Satus 302 5/17/07

Satus 302 8/15/07

South Dr. 5/17/07 Selah Cr. 2/11/08 

DID 7 5/16/07

2007 TMDL Target Selah Ditch 11/26/07

Fraction of Samples (n=85)
Yakima Pesticides/PCBs TMDL: Vol 1, WQ Study Findings 

Page 125 

Comparison with Historical Turbidity Data 

Many farmers along the Yakima River have adopted contemporary soil erosion Best 

Management Practices (BMPs) to meet the 5- and 10-year targets in the Lower Yakima River 

Suspended Sediment and DDT TMDL. The effectiveness of these measures in reducing turbidity 

was assessed by Coffin et al. (2006) for the period between 1995 and 2003 and has been widely 

reported. While it is beyond the scope of the present report to do a comparable assessment, two 

examples illustrate the magnitude of the water quality improvements that have been realized. A 

detailed TMDL effectiveness monitoring report drawing on the 2007-08 data will be prepared 

separately by Ecology. 

1. Figure 56 shows the 90th percentile turbidity in the four major irrigation returns to the lower 

Yakima River during the 1995, 2003, and 2007 irrigation seasons, based on Ecology’s 

monitoring programs. 

Substantial turbidity reductions occurred in all of these returns between 1995 and 2003. By 

2003, Moxee Drain, Sulphur Creek Wasteway, and Spring Creek were meeting the 25 NTU 

target at least 90% of the time. Although falling short of the target, the largest improvement 

was seen in Granger Drain. Data showing declining turbidity and TSS levels in lower 

Yakima River irrigation returns are also reported by Ebbert et al. (2002), Zuroske (2004), 

and Fuhrer et al. (2004). 

Figure 56. 90th Percentile Turbidity in Four Major Returns to the Lower Yakima River during 

the 1995, 2003, and 2007 Irrigation Seasons.

0

20

40

60

80

100

120

140

Moxee Granger Sulphur Spring

Turbidity (NTU)

1995

2003

2007

(335 NTU)

TMDL Target
Yakima Pesticides/PCBs TMDL: Vol 1, WQ Study Findings 

Page 126 

2. The Ecology Freshwater Monitoring Unit (FMU) examined trends in the 1995-2008 turbidity 

data for their ambient monitoring station on the Yakima River at Kiona, using a Seasonal 

Kendall test (Hallock, 2007). The analysis focused on the irrigation season and only 

included data from April through October. These data can be found at 

www.ecy.wa.gov/programs/eap/fw_riv/rv_main.html. 

FMU concluded that: 

 For the whole period there is a strong (p<0.01)h decreasing trend in turbidity (Figure 57). 

This trend is a result of a strong decline in turbidity from the beginning of the period through 

August 2005. 

 Visually, there was a moderate decrease prior to 2000 and a strong decrease in 2000-2005. 

 The higher turbidities have been back up since August 2005. In months when turbidity is 

down, it is still fairly low compared to pre-2001. 

 Peak turbidities are highest in April and May and lowest in August through October. 

 There is a decreasing trend in flow for the whole period (p=0.02). 

 Adjusted for flow, there is still a downward trend in turbidity for the full period (p=0.06). 

 There is significant seasonality in the trend. After adjusting for flow, there is a significant 

increasing trend in April (p=0.01). Flow-adjusted turbidity declined in all other months, 

though the decline was not always significant. 

 

h

 The p-value is the probability that the observed relationship among samples occurred by pure chance. For 

example, a p-value of .05 (i.e., 1 in 20) indicates there is a 5% probability that the relation is by chance alone. 
Yakima Pesticides/PCBs TMDL: Vol 1, WQ Study Findings 

Page 127 

Figure 57. Trend Analysis of Ecology’s Ambient Monitoring Data on Turbidity in the Yakima 

River at Kiona (Dave Hallock, Ecology FMU). 
Yakima Pesticides/PCBs TMDL: Vol 1, WQ Study Findings 

Page 128 

Permitted Discharges 

Municipal Wastewater Treatment Plants 

Eighteen municipal wastewater treatment plants (WWTPs) that discharge to surface waters in the 

Yakima River basin were monitored quarterly for pesticides, PCBs, TSS, and turbidity between 

June 2007 and March 2008. Seventy-two sets of samples were analyzed in all. Facility locations 

were previously shown in Figure 13. 

The three Yakama Reservation WWTPs – Wapato, Harrah, and Toppenish – were not sampled 

as these are under EPA jurisdiction. Ecology lacks regulatory authority to impose wasteload 

allocations and NPDES discharge limitations on Yakama Nation lands. Pesticides were not 

analyzed for the three upper river facilities – Cle Elum, Ellensburg, and Kittitas – due to the 

existing TMDL for these compounds. 

Monitoring results for WWTP effluent are summarized in Table 40. The complete data are in 

Appendix N. 

WWTP effluent contains numerous substances that interfere with a pesticide analysis, making it 

difficult to achieve low detection limits. As a result, pesticide reporting limits in the effluent 

samples were typically in the range of 2.0 – 5.5 ng/L vs. less than 0.1 ng/L in surface water. The 

reporting limit for toxaphene in WWTP effluent was 25 – 27 ng/L compared to 3 ng/L for whole 

surface water samples and about 0.1 ng/L in SPMDs. 

The only 303(d) listed pesticides detected in WWTP effluent were the current-use insecticides 

chlorpyrifos and endosulfan, 33% and 12% of samples, respectively. Toxaphene was also not 

detected. 

Chlorpyrifos was most frequently reported in effluent from the Cowiche, Yakima, Sunnyside, 

and Mabton WWTPs (75% of samples). Cowiche and Yakima were also the only facilities 

where endosulfan was detected (100% and 50% of samples, respectively). These details can be 

seen in Appendix N. 

The maximum concentrations recorded were 11 ng/L for chlorpyrifos and 46 ng/L for 

endosulfan. These concentrations are within human health and aquatic life criteria. 

The analytical method employed for PCBs has greater specificity and is less subject to 

interferences. PCBs were detected in almost every effluent sample (96%). The overall median 

and average total PCB concentrations were 0.37 and 0.58 ng/L, respectively. 

Figure 58 plots the PCB data and compares the data with the human health criterion of 0.17 ng/L. 

Because the Yakima River approaches or exceeds human health criteria for PCBs it has no excess 

loading capacity. Therefore the effluent data are compared directly to the criterion, rather than 

allowing for dilution in the receiving waters. 

 
Yakima Pesticides/PCBs TMDL: Vol 1, WQ Study Findings 

Page 129 

Table 40. Summary of Results from Monitoring 303(d) Listed Pesticides, PCBs, TSS, and 

Turbidity in Final Effluents from Wastewater Treatment Plants in the Yakima Basin during 

2007-08 (quarterly samples from 18 facilities). 

DDT DDE DDD Dieldrin 

 (ng/L) (ng/L) (ng/L) (ng/L) 

No. of Samples 60 60 60 60 

Detection Frequency (%) 0% 0% 0% 0% 

Median Concentration 2.6 U 2.6 U 2.6 U 2.6 U 

Mean Concentration 3.1 U 3.1 U 3.1 U 3.1 U 

90th Percentile Concentration 5.1 U 5.1 U 5.1 U 5.1 U 

Maximum Concentration 5.5 U 5.5 U 5.5 U 5.5 U 

Chlorpyrifos Endosulfan Chlordane Alpha-BHC 

(ng/L) (ng/L) (ng/L) (ng/L) 

No. of Samples 60 60 60 60 

Detection Frequency (%) 33% 12% 0% 0% 

Median Concentration 3.2 U 2.6 U 2.6 U 2.6 U 

Mean Concentration 3.9 U 5.6 U 3.1 U 3.1 U 

90th Percentile Concentration 5.7 J 5.4 J 5.1 U 5.1 U 

Maximum Concentration 11 J 46 J 5.5 U 5.5 U 

Total PCBs* Toxaphene TSS Turbidity 

(ng/L) (ng/L) (mg/L) (NTU) 

No. of Samples 72 60 72 72 

Detection Frequency (%) 96% 0% 96% 100% 

Median Concentration 0.37 J 26 U 4 2.2

Mean Concentration 0.58 J 26 U 20 6.0 

90th Percentile Concentration 0.96 J 27 U 25 6.0 

Maximum Concentration 7.4 J 27 U 555 190 

*Total PCBs is the sum of detected concentrations of the 209 PCB compounds analyzed. 

U = not detected at or above reported value. 

J = estimated. 

 
Yakima Pesticides/PCBs TMDL: Vol 1, WQ Study Findings 

Page 130 

Figure 58. PCB Concentrations in Final Effluents from WWTPs in the Yakima Basin during 

2007-08 Compared to Human Health Criterion (quarterly samples from 18 facilities, 

ng/L = parts per trillion).

Eighty-two percent of the effluent samples (59 out of 72) exceeded the PCB human health 

criterion. Approximately half (52%) exceeded by more than a factor of 2. Substantially elevated 

concentrations greater than 1.0 ng/L (1.1-7.4 ng/L) were observed sporadically. Except for the 

occasional spike in concentration, most facilities were discharging a similar level of PCBs 

(Figure 59)i. 

The June 2007 sample from the Selah WWTP had an unusually high concentration of total PCBs 

at 7.4 ng/L. PCB levels in subsequent samples were similar to WWTPs in other parts of the 

basin. 

Aquatic life criteria for PCBs are relatively high: 14 ng/L for chronic exposure and 2,000 ng/L 

for acute exposure. These levels were not approached in any of the WWTP effluents. 

 

i

 In box and whisker plots of this type, 50% of the results fall within the box, the horizontal line representing the 

median. The whiskers show the range of values that are within a factor of 1.5 of the spread of the box. Asterisks 

and empty circles (next figure) are outside and far outside values, respectively. 
Yakima Pesticides/PCBs TMDL: Vol 1, WQ Study Findings 

Page 131 

Figure 59. Total PCB Concentrations in Final Effluents from Yakima Basin WWTPs during 

2007-08 (ng/L = parts per trillion).

The effluents tended to have higher PCB concentrations during the winter compared to the 

irrigation season (Figure 60). Total PCBs gradually increased from early summer to late winter, 

with median concentrations going from 0.20 to 0.26 to 0.34 to 0.70 ng/L between June and 

March. The differences between sampling periods were statistically significant (p<0.05, 

Kruskal-Wallis test). Higher winter concentrations could be due to more surface runoff entering 

the collection systems. Stormwater samples for the present study showed that urban runoff has 

elevated PCBs levels (see Urban Stormwater Runoff). Dilution by infiltration of irrigation water 

during the growing season could be an equally important factor. 

Figure 60. PCB Concentrations in Yakima Basin WWTP Effluents by Month of Sample 

Collection, 2007-08 (one outlier excluded: Selah WWTP 7,360 pg/L in June).

 

CLE ELUM

ELENSBURG

KITTITAS

SELAH

NACHES

COWICHE

YAKIMA

MOXEE

BUENA

ZILLAH

GRANGER

SUNNYSIDE

SS PORT

MABTON

GRANDVIEW

PROSSER

BENTON CITY

W RICHLAND

0

1

2

3

4

5

6

7

8

T

otal P

C

B

s (

n

g

L

/ )

June September December March

0

1

2

3

T

o

at l P

C

B

s (n

g

L

/ )
Yakima Pesticides/PCBs TMDL: Vol 1, WQ Study Findings 

Page 132 

Table 41 summarizes the PCBs, DDT, and dieldrin data that have been reported for WWTP 

effluents in other parts of Eastern Washington. These results indicate that the PCB 

concentrations measured at Yakima basin facilities are typical of WWTP effluent. The pesticide 

data are more limited, but suggest DDT compounds and dieldrin are characteristically low in 

WWTP effluent, including facilities located in agricultural areas such as the Palouse, Okanogan, 

and Walla Walla. 

Table 41. Summary of Low-Level PCB, DDT, and Dieldrin Data for Eastern Washington 

WWTP Effluents (ng/L; parts per trillion; mean values). 

Receiving Water/ Year N= Total PCBs Total DDT Dieldrin Reference 

WWTP 

Palouse River 

Lubliner (2009) Pullman 2007-08 3 1.4 NA 0.27 

 Colfax 2007-08 3 0.33 NA 0.20 

 Albion 2007-08 1 1.5 NA <0.03 

Okanogan River 

Serdar (2006) Oroville 2001-02 2-3 <.65 0.9 NA 

 Omak 2001-02 2-3 <.65 <1.6 NA 

 Okanogan 2001-02 2-3 <.65 1.6 NA 

Walla Walla River 

Johnson et al. (2004) 

Lubliner (2007) 

 Walla Walla 2002-03 4 0.79 0.23 <0.25 

2006-07 3 0.38 NA NA 

 College Place 2002-03 4 1.3 0.08 <0.21 

2006-07 3 0.30 NA NA 

Spokane River 

 Spokane 2001 2 1.8 NA NA Golding (2002) 

 Liberty Lake 2001 2 1.7 NA NA 

Yakima River present study 18 facility mean 2007-08 72 0.58 <2 <2 

NA = not analyzed. 

 
Yakima Pesticides/PCBs TMDL: Vol 1, WQ Study Findings 

Page 133 

Estimates of PCB loading from Yakima basin WWTPs are shown in Table 42. Because 

pesticides were either not detected or were meeting water quality criteria, loads were not 

calculated. 

Table 42. Summary of Total PCB Loads Measured in Final Effluents from Yakima Basin 

WWTPs during 2007-08. 

Jun-07 Sep-07 Dec-07 Mar-08 Overall 

Mean 

Per WWTP 

Mean Flow (mgd) 1.3 1.3 1.1 1.1 1.2 

Mean PCB Concentration (ng/L) 0.67 0.31 0.52 0.81 0.58 

Mean PCB Load (mg/day) 4.2 3.0 4.0 3.8 3.7 

WWTPs Combined 

Total Flow (mgd) 24 24 20 19 22 

Total PCB Load (mg/day) 76 54 71 68 67 

mgd = million gallons per day. 

The flow reported by each facility was used to calculate the total PCB load for each of the 

quarterly sampling events. The average facility was discharging approximately 0.6 ng/L total 

PCBs at a loading rate to the receiving waters of about 4 mg/day. The combined loading from 

all facilities averaged 67 mg/day. 

The loading rates measured during the four monitoring periods were similar. Decreasing effluent 

flow rates from June through March acted to maintain a similar level of PCB loading even 

though concentrations were on the increase. 

TSS and turbidity levels in Yakima basin WWTP effluents were almost always low, indicating 

the treatment systems were operating properly. Overall median concentrations were 4 mg/L TSS 

and 2.2 NTU turbidity at the times these samples were collected (Table 40). Although PCBs 

have an affinity for particulate matter, there was no evidence of a correlation between total PCBs 

and TSS (R2

=0.19)j. 

In most instances, TSS concentrations were in compliance with the weekly average limit set by 

the NPDES permit (typically 45 mg/L). Three of the four effluent samples from the Port of 

Sunnyside WWTP represent upset conditions with elevated TSS (Appendix N), but the facility 

was not discharging to surface water at those times. NPDES permits for Yakima basin WWTPs 

do not contain discharge limits for pesticides or PCBs. 

 

 

j

 R2 indicates the percent of the PCB data that is explained by TSS (coefficient of determination). 
Yakima Pesticides/PCBs TMDL: Vol 1, WQ Study Findings 

Page 134 

Figure 61 compares the average effluent flow rate on days of sample collection at each WWTP 

with the design flow. The NPDES permits state that design flows are not to be exceeded. Most 

facilities were operating at lower than design flow and thus may have additional treatment 

capacity. Cases where the sampled flow was at or above design flow were primarily limited to 

Moxee WWTP (wastewater now goes to Yakima WWTP) and the Port of Sunnyside WWTP 

(discharge was going to a sprayfield). The larger facilities were always operating well below 

design flow (10-70% of design). 

Figure 61. WWTP Effluent Flow during Monitoring Periods in 2007-08 vs. Design Flow 

(million gallons per day).

0.0

0.5

1.0

1.5

0.0 0.5 1.0

Sampled Flow (mgd)

Design Flow (mgd)

Sampled Flow =Design Flow

<1 MGD

Facilities

0

5

10

15

20

25

0 5 10 15 20 25

Sampled Flow (mgd)

Design Flow (mgd)

Sampled Flow =Design Flow

>1 MGD

Facilities
Yakima Pesticides/PCBs TMDL: Vol 1, WQ Study Findings 

Page 135 

Fruit Packers and Vegetable Processors 

Quarterly monitoring was also conducted at the six fruit packers and vegetable processors that 

discharge to surface water in the lower Yakima basin. Facility locations were previously shown 

in Figure 14. 

Final effluents were analyzed for pesticides, TSS, and turbidity. Table 43 summarizes the results 

for 303(d) listed pesticides. Other pesticides were infrequently detected and concentrations were 

low (Appendix O). PCBs were not analyzed because these types of facilities are not known to be 

sources of PCBs. 

Table 43. Summary of Results from Monitoring 303(d) Listed Pesticides and Toxaphene in 

Effluents from Six Fruit and Vegetable Processors in the Lower Yakima Basin during 2007-08 

(quarterly samples; concentrations in ng/L, parts per trillion). 

 DDT DDE DDD 

No. of Samples 24 24 24

Detection Frequency (%) 46% 67% 67%

Median Concentration 0.064 U 0.37 J 0.18 J 

Mean Concentration 0.51 J 1.0 J 0.40 J 

90th Percentile Conc. 1.6 J 2.9 J 1.0 J 

Maximum Concentration 4.6 J 6.8 1.7

Dieldrin Endosulfan Chlorpyrifos

No. of Samples 24 24 24

Detection Frequency (%) 50% 96% 58%

Median Concentration 0.57 J 2.9 J 1.5 J 

Mean Concentration 0.73 J 11 J 2.7 J 

90th Percentile Conc. 1.7 J 18 J 5.7 J 

Maximum Concentration 2.6 J 93 J 19 J 

Chlordane Alpha-BHC Toxaphene 

No. of Samples 24 24 24

Detection Frequency (%) 13% 25% 0%

Median Concentration 0.063 U 0.063 U 3.1 U 

Mean Concentration 0.14 J 0.10 J 6.4 U 

90th Percentile Conc. 0.2 J 0.18 16 U 

Maximum Concentration 1.3 J 0.35 30 U 

U = not detected at or above reported value. 

J = estimated concentration. 

Because of the likelihood that pesticides were present in these effluents, the samples were 

analyzed using low-level detection (0.061 – 1.2 ng/L, to 3.1 ng/L for toxaphene). DDT 

compounds, dieldrin, endosulfan, and chlorpyrifos were routinely detected at most of the 

facilities (46-96% of samples). Chlordane and alpha-BHC were only occasionally reported 

(13-25% of samples). 
Yakima Pesticides/PCBs TMDL: Vol 1, WQ Study Findings 

Page 136 

Toxaphene was not detected at reporting limits ranging from 3.1 to 30 ng/L. The higher 

reporting limits for toxaphene were due to heavy interferences encountered in certain samples. 

At the time these samples were collected, the plants were primarily processing apples, potatoes, 

or their products. Nectarines, peaches, and pears were being processed in a few instances. There 

was no obvious relationship between what was being processed and pesticide concentrations. 

The percentage of effluent samples that exceeded water quality criteria is shown in Table 44 and 

Figure 62. The results are compared directly to criteria given the exceedances observed in the 

receiving waters. 

Fruit packer and vegetable processor effluent exceeded human health water quality criteria for 

DDT compounds and dieldrin in 17% and 38% of the samples, respectively. Human health 

criteria for endosulfan, chlordane, and alpha-BHC were never exceeded. 

The chronic aquatic life criterion for total DDT was exceeded in 29% of the effluent samples. 

Other pesticides were consistently meeting chronic criteria. Acute aquatic life criteria were 

never exceeded. 

Table 44. Percent of Fruit Packer and Vegetable Processor Effluent Samples Exceeding Water 

Quality Criteria for 303(d) Listed Pesticides during 2007-08. (N=24) 

 DDT DDE DDD Dieldrin 

Human Health Criteria (ng/L) 0.59 0.59 0.83 0.14 

Percent of Samples Exceeding 17% 38% 13% 38% 

Endosulfan Chlorpyrifos Chlordane Alpha BHC 

Human Health Criteria (ng/L) 930 NA 0.57 3.9 

Percent of Samples Exceeding 0% - - 0% 0% 

Total DDT* Dieldrin Endosulfan 

Chronic Aquatic Life Criteria (ng/L) 1.0 1.9 220 

Percent of Samples Exceeding 29% 0% 0% 

Chlorpyrifos Chlordane Alpha BHC 

Chronic Aquatic Life Criteria (ng/L) 41 4.3 NA 

Percent of Samples Exceeding 0% 0% 0% 

* DDT+DDE+DDD. 

NA = not applicable (human health criteria have not been adopted for chlorpyrifos). 
Yakima Pesticides/PCBs TMDL: Vol 1, WQ Study Findings 

Page 137 

Figure 62. Percent of Fruit Packer and Vegetable Processor Effluent Samples Exceeding Human 

Health Criteria (DDT compounds and dieldrin) or Chronic Aquatic Life Criteria (total DDT) 

(quarterly samples, N=24).

Effluent flow rates for most of these facilities are less than 0.3 mgd. The combined flow from all 

six plants ranged from 0.6 – 1.5 mgd (0.9-2.3 cfs) during the four monitoring periods. As a 

result, pesticide loading to surface water was relatively low, as summarized in Table 45. One 

of the six facilities, Gilbert Orchards, discharges to ground and was not included in the load 

calculation. A second, Andrus & Roberts, only discharges to surface water during the winter 

when the ground is frozen. As noted previously, the Prosser ConAgra plant is scheduled to close 

in May 2010. 

Table 45. Summary of Pesticide Loads Measured in Combined Final Effluents from 

Fruit Packers and Vegetable Processors that Discharge to Surface Water in the Lower Yakima 

River Drainage during 2007-08 (half the detection limit used for non-detects; Gilbert Orchards 

excluded). 

 T-DDT Dieldrin Endosulfan Chlorpyrifos 

Mean Load 

(mg/day, facilities combined) 1.1 1.3 9.0 5.2 

The TSS and turbidity data obtained on the effluents are summarized in Table 46. 

0.38 0.38

0.29

0.17

0.13

0%

5%

10%

15%

20%

25%

30%

35%

40%

Percent of Samples

[WQ criteria not exceeded]
Yakima Pesticides/PCBs TMDL: Vol 1, WQ Study Findings 

Page 138 

Table 46. Summary of Results from Monitoring TSS and Turbidity in Effluents from Six Fruit 

Packers and Vegetable Processors in the Lower Yakima Basin during 2007-08 (quarterly 

samples).

Parameter N= Median Mean 90th

Percentile Maximum 

Total Suspended Solids 

(mg/L) 24 7.5 26 63 242 

Turbidity 

(NTU) 24 11 20 32 110 

The NPDES permits that apply to these facilities stipulate a maximum daily TSS discharge of 

30 mg/L (General Permit for the Fresh Fruit Packing Industry) to 180 mg/L (Snokist Growers, 

Terrace Heights). The effluents were meeting this requirement in most cases. 

Two facilities exceeded TSS permit limits: Andrus & Roberts (242 and 86 mg/L on 7/26/07 and 

10/10/07) and Gilbert Orchards (51 and 68 mg/L on 9/5/07 and 12/18/07). Visual observations 

recorded during sample collection indicated effluent turbidity was highly variable at these plants, 

ranging from cloudy to clear. Andrus & Roberts was discharging to their sprayfield; Gilbert 

Orchards was discharging to ground. 

Where DDT compounds were detectable in fruit processor and vegetable packer effluents, there 

was a positive relationship between total DDT and TSS (R2

= 0.54, Figure 63). This suggests that 

the levels of DDT compounds in these effluents could be lowered by reducing TSS. 

Figure 63. Correlation between Total DDT and Total Suspended Solids in Fruit Packer and 

Vegetable Processor Effluents. 

y = 0.1779x0.6449

R2 = 0.54

0.01

0.1

1

10

1 10 100 1000

Total DDT (ng/L)

TSS (mg/L)
Yakima Pesticides/PCBs TMDL: Vol 1, WQ Study Findings 

Page 139 

Urban Stormwater Runoff 

Within the Yakima basin, stormwater discharges from the cities of Ellensburg, Selah, Yakima, 

Union Gap, Sunnyside, West Richland, and Richland come under NPDES requirements of the 

Phase II Municipal Stormwater Permit for Eastern Washington. Runoff samples were obtained 

during six rain storms in Yakima and Union Gap, and four storms in Ellensburg, during the 

winter of 2007-08. For each storm, between two to five storm drains were sampled in each of 

these two areas (see Figures 15 and 16). Twenty-three samples were analyzed overall, 13 from 

Yakima/Union Gap and 10 from Ellensburg. As previously noted, similar sampling was not 

attempted for the other Phase II cities due to infrequent rainfall. West Richland’s stormwater 

goes to the Columbia River. 

The stormwater samples were either single grabs or composites of two grabs collected early in 

the storm once turbid water began to flow in the drains. The Yakima/Union Gap samples were 

analyzed for pesticides, PCBs, TSS, and turbidity. The same analyses were conducted for 

Ellensburg except pesticides were not analyzed due to the existing TMDL. 

The average annual precipitation in Yakima and Ellensburg is 8 and 10 inches, respectively, with 

slightly more than half of it falling between November and February. Samples for the water 

quality study were collected between October and June when 90% of the precipitation occurs. 

Precipitation in Yakima during the water quality study is shown in Figure 64, indicating which 

rain events were sampled. The amount of rainfall preceding sample collection in Yakima is 

shown in Table 47. 

Figure 64. Precipitation in Yakima during the 2007-08 Water Quality Study, Showing When 

Stormwater Samples Were Collected (Yakima airport). 

(www-k12.atmos.washington.edu/k12/grayskies/nw_weather.html)

 

0.00000

0.05000

0.10000

0.15000

0.20000

0.25000

0.30000

0.35000

0.40000

0.45000

0.50000

4/1/07 5/1/07 6/1/07 7/1/07 8/1/07 9/1/07 10/1/07 11/1/07 12/1/07 1/1/08 2/1/08 3/1/08 4/1/08 5/1/08 6/1/08

Precipitation (inches)

10/18 11/17

12/2

3/13 3/28 6/3
Yakima Pesticides/PCBs TMDL: Vol 1, WQ Study Findings 

Page 140 

Table 47. Rainfall Prior To and During Stormwater Sampling in Yakima/Union Gap 

during 2007-08 (inches). 

Sampling 

Date 

Rainfall During 

Previous 24 hours 

Rainfall During 

Previous Week 

Total Rainfall 

For Storm Event 

Sampled 

10/18/2007 0.03 0.16 0.39 

11/17/2007 0 0.02 0.25 

12/2/2007 0 0.49 0.57 

3/13/2008 0 0.010 0.10 

3/28/2008 0 0 0.13 

6/3/2008 0 0.01 0.27 

Concentrations 

Results for 303(d) listed pesticides in Yakima/Union Gap stormwater runoff are summarized in 

Table 48. Most of the results are qualified as estimates due to interferences. 

Table 48. Summary of Results from Analyzing 303(d) Listed Pesticides and Toxaphene in 

Yakima/Union Gap Stormwater during 2007-08 (ng/L, parts per trillion).

 DDT DDE DDD 

No. of Samples 13 13 13

Detection Frequency (%) 77% 92% 38%

Median Concentration 9.9 J 13 J 2.5 U 

Mean Concentration 13 J 17 J 2.8 J 

90th Percentile Concentration 28 J 45 J 3.6 J 

Maximum Concentration 33 J 54 J 4.1 J 

Dieldrin Endosulfan Chlorpyrifos

No. of Samples 13 13 13

Detection Frequency (%) 38% 85% 62%

Median Concentration 2.8 J 17 4.1 J 

Mean Concentration 3.7 J 32 33 J 

90th Percentile Concentration 6.2 J 87 129 J 

Maximum Concentration 7.4 J 107 222 J 

Chlordane Alpha-BHC Toxaphene 

No. of Samples 13 13 13

Detection Frequency (%) 23% 0% 8%

Median Concentration 2.5 UJ 2.5 UJ 25 UJ

Mean Concentration 3.4 UJ 3 UJ 26 UJ

90th Percentile Concentration 3.5 J 3 UJ 27 UJ

Maximum Concentration 13 J 3.6 UJ 30 J 

U = not detected at or above reported value. 

J = estimated. 
Yakima Pesticides/PCBs TMDL: Vol 1, WQ Study Findings 

Page 141 

DDT compounds, dieldrin, endosulfan, and chlorpyrifos were routinely detected (38-92% of 

samples). Chlordane and toxaphene were infrequently detected. Alpha-BHC was not detected. 

For detected compounds, the concentrations found were far above those recorded in water 

samples from other NPDES discharges or in surface water samples, by one-to-two orders of 

magnitude in most cases. Several additional pesticides or breakdown products were also 

detected in stormwater. These included endosulfan sulfate, aldrin, heptachlor epoxide, and 

hexachlorobenzene (Appendix P). 

Table 49 has a summary of the PCB data for Yakima/Union Gap and Ellensburg. PCBs were 

detected in all samples. The levels were generally similar between the two urban areas. As with 

pesticides, PCB concentrations were high compared to other types of samples collected for the 

water quality study. The pesticide and PCB concentrations measured in stormwater are 

compared to other sources later in this report. 

Table 49. Summary of Results from Analyzing PCBs in Yakima/Union Gap and Ellensburg 

Stormwater during 2007-08 (ng/L, parts per trillion). 

 

Total 

PCBs 

Yakima/Union Gap 

 No. of Samples 12

 Detection Frequency (%) 100%

 Median Concentration 9.9 J

 Mean Concentration 9.8 J

 90th Percentile Concentration 19 J

 Maximum Concentration 28 J

Ellensburg 

 No. of Samples 10

 Detection Frequency (%) 100%

 Median Concentration 2.1 J

 Mean Concentration 6.4 J

 90th Percentile Concentration 13 J

 Maximum Concentration 33 J

J = estimated. 

 
Yakima Pesticides/PCBs TMDL: Vol 1, WQ Study Findings 

Page 142 

Figure 65 shows the percentage of Yakima/Union Gap stormwater samples that exceeded human 

health criteria for the primary compounds of concern in this study. Because most of these 

chemicals bioaccumulate, even short-term discharge during storms has the potential to contribute 

to fish consumption concerns. It should be noted that many of these storm drains flow yearround, although at reduced rates. 

Figure 65. Percent of Yakima/Union Gap Stormwater Samples Exceeding Human Health 

Criteria for 303(d) Listed Pesticides and PCBs during 2007-08. (N=13)

Stormwater exceeded human health criteria for DDE and PCBs in almost all samples and for 

DDT, DDD, and dieldrin in slightly less than half the samples. The chlordane and toxaphene 

criteria were also occasionally exceeded. The exceedances were routinely by one-to-two orders 

of magnitude. 

Being short-term phenomena, stormwater discharges are more appropriately compared to acute 

rather than chronic aquatic life criteria. The acute criteria apply to either an instantaneous or 

1-hour average concentrations, while the chronic criteria are for 24-hour or 4-day average 

concentrations. The stormwater samples did not exceed acute criteria for pesticides or PCBs. 

Chlorpyrifos was recorded at the acute criterion of 220 ng/L in one instance (Appendix P). 

Toxaphene was detected at a very high concentration in one of the Yakima area storm drain 

samples (29 and 32 ng/L in replicate samples; Appendix P). This concentration substantially 

exceeds the human health criterion (0.73 ng/L), but not the acute aquatic life criterion (730 

ng/L). The detection limit in the other stormwater samples (25-27 ng/L) was too high to assess 

compliance with water quality criteria. 

 

92%

38% 38% 38%

23%

8%

0% 0%

100%

0%

20%

40%

60%

80%

100%
Yakima Pesticides/PCBs TMDL: Vol 1, WQ Study Findings 

Page 143 

Several other pesticides or breakdown products also exceeded human health criteria in 

stormwater but not aquatic life criteria. These included heptachlor epoxide (5 of 13 samples), 

aldrin (1 of 13 samples), and hexachlorobenzene (1 of 13 samples). These data are also in 

Appendix P. 

A summary of the TSS and turbidity data obtained on stormwater is provided in Table 50. As 

with other parameters, TSS and turbidity levels were high. 

Table 50. Summary of Results from Analyzing TSS and Turbidity in Yakima/Union Gap and 

Ellensburg Stormwater during 2007-08.

TSS Turbidity 

 (mg/L) (NTU) 

Yakima/Union Gap 

 No. of Samples 15 15

 Detection Frequency (%) 93% 100%

 Median Concentration 111 230 J

 Mean Concentration 225 223 J

 90th Percentile Concentration 547 420 J

 Maximum Concentration 654 475

Ellensburg 

 No. of Samples 13 13

 Detection Frequency (%) 100% 100%

 Median Concentration 64 120

 Mean Concentration 85 132

 90th Percentile Concentration 151 230

 Maximum Concentration 206 280 

mg/L = parts per million. 

NTU = nephelometric turbidity units. 
Yakima Pesticides/PCBs TMDL: Vol 1, WQ Study Findings 

Page 144 

Comparison with Other Data 

Several other studies have analyzed pesticides and PCBs in stormwater samples from Eastern 

Washington cities, all in connection with TMDLs. As in the present study, these efforts relied on 

simple grabs or composite samples from a few grabs. The data are summarized as median values 

in Table 51. 

Table 51. Comparison of 303(d) Pesticide, PCB, and TSS Levels Measured in Urban 

Stormwater Samples in Eastern Washington (median values).

City: Pullman Yakima/ 

Union Gap Ellensburg Spokane 

Sampling Period: 2005-06 2007-08 2007-08 2007 2005 

Reference: Lubliner et al. 

(2006) 

present 

study 

present 

study 

Parsons 

(2007) 

Serdar et al. 

(2006) 

Number of Storms 3 6 4 3 1 

Number of Drains 3 up to 5 up to 5 14 4 

Number of Samples 9 12 10 37-39 4 

Total DDT (ng/L) 3.0 23 na na na 

Dieldrin (ng/L) 0.53 2.8 na na na 

Endosulfan (ng/L) 0.74 17 na na na 

Chlorpyrifos (ng/L) na 4.1 na na na 

Chlordane (ng/L) 2.1 U 2.5 UJ na na na 

Alpha-BHC (ng/L) 0.20 2.5 UJ na na na 

Total PCBs (ng/L) 17 9.9 2.1 6.3 41 

TSS (mg/L) 60 111 64 30 75 

na = not analyzed. 

U = not detected. 

J = estimated. 

Pesticide data were only available for Pullman. That study found much lower concentrations of 

total DDT and endosulfan than present study results for Yakima/Union Gap stormwater. Results 

for other 303(d) listed pesticides were similar between these two areas. 

PCBs have been analyzed in both Pullman and Spokane runoff. The PCB levels measured for 

Yakima/Union Gap and Ellensburg are at the lower end of the concentrations reported for these 

two cities. 

Yakima/Union Gap stormwater samples had much higher TSS levels than Ellensburg, Pullman, 

or Spokane. 

 
Yakima Pesticides/PCBs TMDL: Vol 1, WQ Study Findings 

Page 145 

Loads 

The Simple Method (Schueler, 1987) was used to estimate the pollutant loads carried by 

Yakima/Union Gap and Ellensburg stormwater. This unit area model estimates loads of 

chemical constituents as a product of annual runoff volume and pollutant concentration, 

according to the formula:

L = 0.226 * R * C * A 

Where: 

L = Annual load (lbs) 

R = Annual runoff (inches) 

C = Pollutant concentration (mg/L) 

A = Area (acres) 

0.226 = Unit conversion factor 

Annual runoff (R) is estimated as the product of rainfall, fraction of events that yield runoff, and 

a runoff coefficient: 

R = P * Pj * Rv 

Where: 

R = Annual runoff (inches) 

P = Annual rainfall (inches) 

Pj = Fraction of annual rainfall events that produce runoff (usually 0.9) 

Rv = Runoff coefficient 

Rv = 0.05+(0.91*Impervious Fraction) 

 
Yakima Pesticides/PCBs TMDL: Vol 1, WQ Study Findings 

Page 146 

The values used for Yakima/Union Gap and Ellensburg in the above equations are given in 

Table 52. Appendix Q has values for the same parameters for Sunnyside and for that portion of 

Richland that discharges stormwater to the Yakima River. 

Table 52. Values Used to Calculate Stormwater Loads from Yakima/Union Gap and Ellensburg. 

Yakima/Union Gap 

Yakima City Limit (acres) 17,486 

Union Gap City Limit (acres) 3,224 

Selah City Limit (acres) 2,858 

Moxee City Limit (acres) 1,020 

All City Limit Areas (acres) 24,587 

Annual Rainfall (inches) 8.0 

Fraction of Runoff 0.90 

Impervious Fraction 0.22 

Runoff coefficient 0.25 

Annual Runoff (inches) 1.79 

Ellensburg 

City Limit (acres) 4,279 

Annual Rainfall (inches) 10.0 

Fraction of Runoff 0.90 

Impervious Fraction 0.22 

Runoff coefficient 0.25 

Annual Runoff (inches) 1.79 

The urban areas shown above were the city limits, obtained through Phase I-II stormwater permit 

area maps www.ecy.wa.gov/programs/wq/stormwater/municipal/maps.html. The area applied to 

the Yakima/Union Gap stormwater data included Union Gap, Selah, and Moxee. 

Annual runoff was based on Figure 4.3.1 in the Stormwater Management Manual for Eastern 

Washington (Ecology, 2004). The average annual precipitation is 10 inches in Ellensburg and 

8 inches in Yakima (1961-1990 data). 

In the absence of other information, the fraction of annual rainfall events that produce runoff (Pj) 

is usually assumed to be 0.9. This value has a strong effect on the results and is a potential 

source of bias in the load estimates. 

The equation for Rv is the best fit line for the relationship between the storm runoff coefficient 

and watershed imperviousness (Schueler, 1987). An impervious fraction of 22% was used to 

calculate Rv. This value was taken from similar stormwater studies that evaluated land use in 

the cities of Spokane (Rv=22%) and Pullman (Rv=25%) (Serdar et al., 2006; Lubliner et al., 

2006). 
Yakima Pesticides/PCBs TMDL: Vol 1, WQ Study Findings 

Page 147 

Results of the stormwater load calculations are summarized in Tables 53 and 54 for the primary 

contaminants of concern. Pollutant loads were based on the median concentration among the 

samples collected. The median was used rather than the mean due to variability in the data. 

Table 53. Estimated Loading of 303(d) Listed Pesticides and PCBs in Stormwater Runoff from 

Yakima/Union Gap and Ellensburg. 

Location/ 

Pollutant 

Median 

Concentration 

(ng/L) 

Daily Load 

(grams/day) 

Yakima/Union Gap 

DDT 9.9 J 0.12 

DDD 2.5 U <0.03 

DDE 13 J 0.16 

Total DDT 23 J 0.28 

Dieldrin 2.8 J 0.03 

Chlorpyrifos 4.1 J 0.05 

Endosulfan 17 J 0.21 

Total PCBs 9.9 J 0.12 

Ellensburg 

Total PCBs 2.1 J 0.01 

U = not detected at or above reported value 

J = estimated value 

Table 54. Estimated TSS Loading in Stormwater from Yakima/Union Gap and Ellensburg.

Location 

Median 

Concentration 

(mg/L) 

Daily Load 

(tons/day) 

Annual Load 

(tons) 

Yakima/Union Gap 111 1.5 550 

Ellensburg 64 0.19 69 

The advantage of using the Simple Method is that it requires a modest amount of information 

and is considered to provide reasonable estimates of pollutant export from urban areas 

(www.stormwatercenter.net). It is important, however, not to over emphasize the precision of 

the results obtained. In addition, the Simple Method only estimates pollutant loads generated 

during storm events. It does not consider pollutants associated with baseflow volume. 

The present study is one of the larger efforts to characterize toxics in stormwater from urban 

areas in Washington. However, urban stormwater runoff is inherently variable in both quality 

and quantity. Although a consistently elevated level of contamination was observed in 

Yakima/Union Gap and Ellensburg stormwater, it should be recognized that spatial and temporal 

variability in these discharges is still poorly known. 
Yakima Pesticides/PCBs TMDL: Vol 1, WQ Study Findings 

Page 148 

Point and Nonpoint Sources Compared 

The results from analyzing 303(d) pesticides, PCBs, TSS, and turbidity in the lower Yakima 

River basin during 2007-08 are compared as medians in Figure 66. Note that the concentrations 

are on a log scale (factors of 10). 

The following sources stand out in terms of concentrations: 

 303(d) pesticides, PCBs, TSS, and turbidity were higher in Yakima/Union Gap stormwater 

runoff than in other sources, typically by an order of magnitude or more. Similar levels of 

PCBs, TSS, and turbidity were found in Ellensburg stormwater. 

 Sources that ranked second behind stormwater included irrigation returns (DDT compounds 

and TSS), fruit packer and vegetable processor effluents (dieldrin, chlorpyrifos, and 

endosulfan), and WWTP effluents (PCBs). 

 Comparable data were not obtained on toxaphene. Results point to at least some irrigation 

returns as having elevated concentrations. A high toxaphene concentration was recorded in 

one instance in a Yakima area stormwater sample. Reporting limits were not low enough to 

rule out the presence of significant concentrations in other stormwater samples. 

The impacts of these sources on the Yakima River are a function of pollutant concentration and 

flow (loads), as well as dilution at the point of discharge. The amount of available dilution 

varies with location and season. However, a general sense of the relative importance of sources 

can be gained by a simple comparison of loads. 

The load estimates for point and nonpoint sources, calculated earlier in this report, are compared 

in Figure 67. The loads in the lower Yakima River at Kiona and Horn Rapids provide a point of 

reference. 

Reporting limits were high for most pesticides in WWTP effluent and for toxaphene in NPDES 

discharges in general. To avoid the perception that concentrations were zero, half the reporting 

limit was used to calculate a load for these chemicals in Figure 67. The true loads are unknown. 

In all cases, the largest loads are from the irrigation returns and tributaries, followed by 

stormwater. When averaged over the entire year, the stormwater loads are only about 1/10 of 

those calculated for the returns. While the other sources evaluated in this study are continuous 

discharges, stormwater is released in a series of relatively brief, concentrated pulses. For this 

reason, stormwater has a greater potential for adverse water quality impacts than the load 

estimates might suggest. Pollutant concentrations in the storm drains during baseflow conditions 

are unknown. 
Yakima Pesticides/PCBs TMDL: Vol 1, WQ Study Findings 

Page 149 

Figure 66. Median Concentrations of Selected Pollutants in the Lower Yakima River Drainage 

during 2007-08 (log scale). 

0.01

0.1

1

10

100

Total DDT Dieldrin Chlorpyrifos Endosulfan

ng/L (parts per trillion)

Selected 303(d) Pesticides

Mainstem & Naches R.

Major Returns

Screening Survey Tribs.

Fruit & Vegetable

Stormwater

0.01

0.1

1

10

Mainstem &

Naches R.

Major Returns Screening

Survey Tribs.

WWTPs Fruit &

Vegetable

Stormwater

ng/L (parts per trillion)

Total PCBs

NA NA

0

50

100

150

200

250

1

10

100

1000

Turbidity (NTU)

TSS (mg/L)

TSS

Turbidity
Yakima Pesticides/PCBs TMDL: Vol 1, WQ Study Findings 

Page 150 

 

 

Figure 67. Loading Comparison for Selected Pollutants Analyzed in 2007-08 (unfilled bars are 

estimated loads based on half the reporting limit). 

<0.10

0.001

~0.10

0.28

0.80

2.1

2.1

3.6

0.0 1.0 2.0 3.0 4.0

WWTP

Fruit & Vegetable

Upper Yakima (@ Harrison)

Yakima Stormwater

Naches River

Other Tribs & Returns

Major Returns

Yakima @ Kiona

Total DDT (grams per day)

sum=5.5

<0.10

0.001

0.03

~0.10

~0.20

0.30

0.36

0.60

0.0 0.1 0.2 0.3 0.4 0.5 0.6 0.7

WWTP

Fruit & Vegetable

Yakima Stormwater

Naches River

Upper Yakima (@ Harrison)

Other Tribs & Returns

Major Returns

Yakima @ Kiona

Dieldrin (grams per day)

sum=1.1
Yakima Pesticides/PCBs TMDL: Vol 1, WQ Study Findings 

Page 151 

Figure 67. Loading Comparison (continued). 

0.23

0.005

0.41

~0.90

~4.0

4.8

8.7

36

0 10 20 30 40

WWTP

Fruit & Vegetable

Yakima Stormwater

Upper Yakima (@ Harrison)

Naches River

Major Returns

Other Tribs & Returns

Yakima @ Kiona

Chlorpyrifos (grams per day)

sum=19

NA

NA

0.01

0.06

0.07

0.12

1.6

1.9

1.6

1.9

0.0 0.5 1.0 1.5 2.0 2.5

Other Tribs & Returns

Fruit & Vegetable

Ellensburg Stormwater

Wilson Creek

WWTP

Yakima Stormwater

Upper Yakima (@ Roza)

Major Returns

Naches River

Yakima @ Horn Rapids

grams per day

Total PCBs (grams per day)

sum=2.7
Yakima Pesticides/PCBs TMDL: Vol 1, WQ Study Findings 

Page 152 

Figure 67. Load Comparison (continued). 

Comparing the summed loads in Figure 67 with the downstream loads in the Yakima River at 

Kiona and Horn Rapids provides a means of gauging how well the water quality study accounted 

for pollutant loads to the Yakima River. 

It was impractical to obtain synoptic data on all these discharges. It is therefore not surprising 

that the estimates of the incoming and outgoing loads are not always in close correspondence. 

Overall however, the water quality study does appear to have accounted for the major sources of 

total DDT, dieldrin, PCBs, toxaphene, and TSS. 

The study accounted for only about half of the chlorpyrifos loading to the river. This can 

probably be attributed to the difficulty of defining the short-term spikes in concentrations that 

occur during application periods. 

<0.001

<0.6

<0.8 <4.9

0.7

1.1

1.2

2.1

5.0

0123456

Fruit & Vegetable

Yakima Stormwater

WWTP

Other Tribs & Returns

Wilson Creek

Naches River

Upper Yakima (@ Roza)

Major Returns

Yakima @ Horn Rapids

Toxaphene (grams per day)

sum=5.1

sum=11

0.01

0.19

0.80

1.5

48

53

58

66

236

0 50 100 150 200 250

Fruit & Vegetable

Ellensburg Stormwater

WWTP

Yakima Stormwater

Other Tribs & Returns

Major Returns

Upper Yakima (@ Harrison)

Naches River

Yakima @ Kiona

TSS (tons per day)

sum=228
Yakima Pesticides/PCBs TMDL: Vol 1, WQ Study Findings 

Page 153 

Table 55 shows the relative importance of the point and nonpoint sources assessed in the water 

quality study, in terms of percent of the summed load (from Figure 67). Chlordane was detected 

too infrequently to compare source loadings. 

Table 55. Relative Importance of Point and Nonpoint Loads to Lower Yakima River (based on 

loads shown in Figure 67). 

Source Total DDT Dieldrin Chlorpyrifos Total PCBs Toxaphene TSS 

(g/day) (g/day) (g/day) (g/day) (g/day) (tons/day) 

Total Point/ 

Nonpoint Load 5.5 1.1 19 2.7 5.1 - 11 228 

Upper Yakima and 

Naches Rivers ~17% ~30% 26% 73% 20-45% 54% 

Tributaries and 

Returns 78% 66% 71% 20%* 55-67% 44% 

Yakima Area 

Stormwater 5% 3% 2% 5% <5% - <12% 1% 

Ellensburg 

Stormwater NA NA NA <1% NA <1% 

WWTPs <2% <9% 1% 3%† <7% - <16% <1% 

Fruit & Vegetable <1% <1% <1% NA NA <1% 

NA = not analyzed. 

*Wilson Creek, Moxee Drain, Granger Drain, Sulphur Creek Wasteway, and Spring Creek only. 

†includes Ellensburg, Cle Elum, and Kittitas WWTPs. 

 
Yakima Pesticides/PCBs TMDL: Vol 1, WQ Study Findings 

Page 154 

Status of 303(d) Listed Chemicals and 

Toxaphene in the Yakima River 

The water quality status of the Yakima River basin with respect to 303(d) listed chemicals and 

toxaphene is summarized in Tables 56 (reservoirs and mainstem) and 57 (tributaries and returns), 

based on results from Ecology’s 2007-08 water quality study and 2006 fish tissue survey. The 

determination as to whether a particular waterbody segment did or did not exceed criteria 

generally follows Ecology’s sample size requirements for 303(d) listing (Ecology, 2006): 

Water column data: A segment will be placed in Category 5 (i.e., the 303(d) list) due to a toxic 

pollutant in the water column when two or more samples within a three-year period exceed the 

applicable criteria. 

Tissue data: A segment will be placed in Category 5 if either the mean of three single-fish 

samples with the highest concentration of a given pollutant or one composite sample made up of 

at least five fish exceed the applicable criteria. 

In some instances, PCBs and toxaphene are highlighted as exceeding water quality criteria based 

on results from one or two SPMD passive samples (from the data in Table 30). It should be 

noted that Ecology policy does not address using SPMD data for 303(d) listing purposes. Also, 

a single sample does not strictly meet the two-sample-per-segment minimum for listing under 

Category 5. However, as previously discussed, chemical concentrations derived from SPMDs 

are comparable to other types of low-level water samples. And, because SPMDs measure the 

long-term average concentration of a chemical, the results should be considered to carry at least 

as much weight as two separate grab samples. 

 
Yakima Pesticides/PCBs TMDL: Vol 1, WQ Study Findings 

Page 155 

Table 56. Summary of Water Quality Exceedances in Yakima River Storage Reservoirs, 

Mainstem Yakima River and Naches River for 303(d) Listed Chemicals and Toxaphene during 

Ecology’s 2006-08 Fish Tissue and Water Quality Studies. 

( = Criteria were exceeded in at least one composite edible fish tissue sample, two whole 

water samples, or one SPMD passive sample at one or more sampling sites per waterbody. 

 = Criteria were not exceeded.)

Waterbody/ 

Chemical 

Human Health 

Criterion 

Chronic 

Aquatic Life 

Criterion 

Acute 

Aquatic Life 

Criterion 

Fish Tissue Water Column Water Column 

Keechelus Lake (WRIA 39) 

PCBs  NA NA NA

Kachess Lake (WRIA 39) 

PCBs  NA NA NA 

Upper Mainstem (WRIA 39) 

PCBs    

Dioxin  NA NA/** NA/** 

Naches River (WRIA 38)   

PCBs NA 

Lower Mainstem (WRIA 37) 

DDT    

DDE   **  **

DDD    

Total DDT **  **  

Dieldrin    

Chlorpyrifos    

Chlordane    

PCBs    

Toxaphene    

Dioxin  NA NA/**  NA/** 

NA = not analyzed. 

** Human health criteria have not been established for total DDT or chlorpyrifos; aquatic life criteria for DDT 

compounds apply to total DDT only; aquatic life criteria have not been established for dioxin. 

 
Yakima Pesticides/PCBs TMDL: Vol 1, WQ Study Findings 

Page 156 

Table 57. Summary of Water Quality Exceedances in Tributaries and Irrigation Returns of the 

Yakima and Naches Rivers for 303(d) Listed Chemicals and Toxaphene. 

( = Criteria were exceeded in at least two whole water samples or one SPMD passive sampler 

during Ecology’s 2007-08 water quality studies.  = Criteria were not exceeded. Endosulfan, 

chlordane, and alpha BHC did not exceed (not shown in table). Dioxin was not analyzed in 

water samples. Fish samples were not analyzed from these waterbodies.) 

Waterbody/ 

WRIA 

Tributary/ 

Irrigation 

Return 

Human Health Criteria Aquatic Life Criteria

Chronic Acute

DDT DDE 

DDD 

Dieldrin 

PCBs 

Toxaphene 

Total DDT 

Chlorpyrifos 

Toxaphene 

Chlorpyrifos 

Upper 

Yakima/39 Wilson Creek - - - - - - - -   - - - -  - - 

Naches/38 Cowiche Creek     NA† *   * 

Lower 

Yakima/37

Sulphur Cr. WW          

Granger Drain          

Moxee Drain          

Spring Creek          

Grandview Drain     NA *   * 

Satus Drain #302     NA *   * 

Drain #31     NA *   * 

Wide Hollow Cr.     NA *   * 

E. Toppenish Dr.     NA *   * 

Satus Drain #303     NA *   * 

Selah Ditch     NA *   * 

Zillah Drain     NA *   * 

South Drain     NA *   * 

Subdrain 35     NA *   * 

DID #7     NA *   * 

Marion Drain     NA *   * 

- - = to be reported separately (TMDL Effectiveness Monitoring). 

NA = not analyzed. 

* = high reporting limits. 

†Currently 303(d) listed based on historical fish tissue data. 
Yakima Pesticides/PCBs TMDL: Vol 1, WQ Study Findings 

Page 157 

Pollutants for which a TMDL or 

Other Control Plan is Needed 

The Clean Water Act requires that a TMDL or other pollution control plan be developed for each 

303(d) listed pollutant in a waterbody. Findings from Ecology’s 2006-08 studies show 303(d) 

listings are appropriate for the locations and pollutants shown in Table 58, either due to 

previously listed chemicals continuing to exceed criteria or new findings. The toxaphene TMDL 

recommendation for the Lower Yakima River and the PCB recommendation for the Naches 

River (except for the Cowiche Creek fish tissue listing, Appendix A) are based on SPMD passive 

samplers, and thus do not strictly meet listing requirements for 303(d). 

Table 58. Yakima Basin WRIAs Where a TMDL or Other Pollution Control Plan is Needed. 

Keechelus Lake 

Kachess Lake 

(WRIA 39) 

Upper 

Yakima River 

(WRIA 39) 

Lower 

Yakima River 

(WRIA 37) 

Naches River 

(WRIA 38) 

PCBshh PCBshh 

Toxapheneaq* 

(Wilson Creek)

Dioxinhh

PCBshh 

Toxaphenehh,aq*

DDEhh 

Total DDT aq 

Chlordanehh 

Dieldrinhh 

Chlorpyrifosaq 

(returns/tributaries) 

Dioxinhh

PCBshh

DDEhh 

(Cowiche Creek) 

Total DDTaq* 

(Cowiche Creek) 

Number of 2008 303(d) Listings Addressed 

1 2 78 2 

hh = human health criteria at issue. 

aq = aquatic life criteria at issue. 

*not currently listed. 

 

Previously unlisted impairments identified within these WRIAs are itemized below in Table 59. 

 
Yakima Pesticides/PCBs TMDL: Vol 1, WQ Study Findings 

Page 158 

Table 59. Potential Unlisted Waterbody Impairments in the Yakima River Drainage 

WRIA Water Body Name Parameter Medium 

37 

Lower Yakima 

DID 7 DDE Water 

Drain #31 

DDE Water 

Dieldrin Water 

T-DDT Water 

East Toppenish Drain 

DDE Water 

Dieldrin Water 

T-DDT Water 

Grandview Drain 

DDE Water 

T-DDT Water 

Dieldrin Water 

Granger Drain PCBs Water* 

Toxaphene Water* 

Moxee Drain Toxaphene Water* 

Satus Drain #302 

DDE Water 

T-DDT Water 

Dieldrin Water 

Satus Drain #303 

DDE Water 

T-DDT Water 

Dieldrin Water 

South Drain DDE Water 

T-DDT Water 

Spring Creek Dieldrin Water 

Toxaphene Water* 

Sub Drain #35 DDE Water 

T-DDT Water 

Sulphur Creek Wasteway PCBs Water* 

Toxaphene Water* 

Yakima River @ 

Sunnyside Dam Toxaphene Water* 

Yakima River nr. Prosser Toxaphene Water* & 

Fish Tissue 

Yakima River nr. 

Horn Rapids Toxaphene Water* & Fish Tissue 

Zillah Drain DDE Water 

T-DDT Water 

38 

Naches 

Naches River PCBs Water* 

Cowiche Creek T-DDT Water 

39 

Upper Yakima 

Kachess Lake PCBs Water 

Selah Ditch DDE Fish Tissue 

T-DDT Water 

Wilson Creek Toxaphene Water* 

*based on SPMD samples. 
Yakima Pesticides/PCBs TMDL: Vol 1, WQ Study Findings 

Page 159 

PCBs, Dioxin, Chlorpyrifos, and Chlordane 

Some additional discussion on the occurrence and significance of PCBs, dioxin, chlorpyrifos, 

and chlordane in the Yakima River follows: 

PCBs 

Currently, there are 92 individual 303(d) listings in Washington State for PCBs exceeding human 

health criteria in surface waters. Many of these listings are from lakes and rivers with no 

obvious local sources of these compounds, Keechelus Lake and Kachess Lake being examples 

in the Yakima basin. 

The PCB analyses in the present water quality study are an integral part of Ecology’ plans to 

address 303(d) water quality concerns in the Yakima River. The PCB assessment identified 

several opportunities to approach water quality improvements through a direct implementation 

approach for a contaminant that may not be addressed effectively through a traditional TMDL 

track. The assessment provides opportunities for direct implementation while working through 

statewide issues associated with the widespread presence of PCBs in Washington’s waterways. 

Additionally, an updated and thorough assessment of PCBs provides a current benchmark for 

long-term assessment of implementation actions, even for those not directly targeted at PCB 

levels, such as efforts to reduce TSS levels in runoff to the Yakima River. 

Sulphur Creek Wasteway, Granger Drain, and Yakima area stormwater are examples of elevated 

PCB contamination where potential sources should be considered and opportunities for targeted 

cleanups may exist (e.g., transformer storage yards, natural gas drilling, old landfills, or illegal 

dumpsites existing in the area). 

Dioxin 

In view of the low dioxin concentrations in Yakima River fish and due to budget constraints, 

dioxin was not analyzed in the 2007-08 water quality study. Although only a few fish samples 

from the 2006 survey exceeded human health criteria, 303(d) policy requires listing in instances 

where even a single composite sample is above criteria. 

(www.ecy.wa.gov/programs/wq/303d/wqp01-11-ch1Final2006.pdf). 

Dioxin is an unintentional byproduct of combustion and certain industrial processes. It has been 

the subject of source controls locally and nationally, including a TMDL for the Columbia River 

basin (EPA, 1991a). Dioxin levels are expected to decrease in the Yakima River in the future. 

Dioxin will remain on the 303(d) list of contaminants to be addressed in the Yakima basin. 

Additional water quality work on Yakima River dioxins will be prioritized along with other 

water quality concerns in the Central Region through Ecology’s annual watershed scoping 

process. Ecology is currently evaluating low-level dioxin contamination through a statewide 

 
Yakima Pesticides/PCBs TMDL: Vol 1, WQ Study Findings 

Page 160 

study on the dioxin and PCB background in fish from Washington rivers and lakes (Johnson et 

al., 2010). Findings from this study are likely to have implications for addressing 303(d) listings 

for dioxins and PCBs in the Yakima River. 

Ecology plans to address dioxins on a larger scale (possibly region- or state-wide) in the future. 

Additionally, because dioxins are often carried via air and can pollute sizeable areas not 

necessarily limited to watersheds, a larger TMDL footprint will likely be more effective and 

efficient. 

Chlorpyrifos 

Unlike legacy pesticides, chlorpyrifos is a water quality concern in the Yakima drainage only 

during the growing season, in and around the times it is applied. Chlorpyrifos and other 

organophosphorus insecticides have faster breakdown rates, lower affinity for sorption and 

bioaccumulation, and greater solubility. Aquatic life criteria are the primary concern with 

chlorpyrifos, rather than human health concerns prominently associated with legacy pollutants. 

The Federal Insecticide, Fungicide, and Rodenticide Act (FIFRA) governs the sale and use of 

chlorpyrifos by directing EPA to regulate pesticides through a registration process. A pesticide 

may not be sold or used in the U.S. unless it is registered by EPA and has an approved label 

authorizing a given use. Additionally, FIFRA requires product labels to specify where and how 

pesticide products may be used and applied. EPA must periodically review the registration to 

ensure compliance with FIFRA and other federal laws. The Washington State Department of 

Agriculture (WSDA) has legal authority to impose any of these restrictions. 

The National Oceanic and Atmospheric Administration (NOAA, 2008) recently issued findings 

that chlorpyrifos jeopardizes the survival of Pacific salmon listed as threatened or endangered in 

the West. A recent decision in a lawsuit brought by environmental and commercial fishing 

groups expanded buffers to 1,000 feet from streams for aerial spraying, 500 feet for ground 

spraying, plus a 20-foot strip of grass or brush. Chlorpyrifos cannot be sprayed when the wind is 

blowing or when a major storm might wash it into rivers and streams. The old buffers were 

300 feet for aerial spraying and 60 feet for ground spraying, with no vegetation strip required. 

EPA has one year to implement these findings. When put into effect, the new requirements will 

be considered an implementation activity for chlorpyrifos under the TMDL statute. Inclusion of 

chlorpyrifos in the TMDL will provide assurance that that they will be implemented and their 

effectiveness monitored. 

Chlorpyrifos should remain part of this TMDL. Actions by other Federal and State agencies may 

create the implementation requirements to bring about water quality compliance, but could be 

aimed at some other regulatory criteria. Inclusion in the TMDL provides the ability to track the 

implementation of the developing rules and the application and compliance with those rules to 

determine if they succeed in achieving and assuring compliance with water quality standards. 

 
Yakima Pesticides/PCBs TMDL: Vol 1, WQ Study Findings 

Page 161 

Ecology has an ongoing monitoring program for current-use pesticides in the lower Yakima 

basin that includes chlorpyrifos (the previously mentioned Surface Water Monitoring Program 

for Pesticides in Salmonid-Bearing Streams 

www.ecy.wa.gov/programs/eap/toxics/pesticides.htm). WSDA and Ecology are engaging 

growers in the watershed for help in determining less toxic and less mobile pesticides through a 

series of presentations. Application methods, integrated pest management, and meteorological 

planning are included to help prevent off-site transport. 

Chlordane 

Ecology’s 2006 fish tissue study showed human health criteria exceedances for chlordane were 

limited to carp analyzed in the vicinity of Prosser and that the exceedances were marginal. This 

is the same general location for the existing 303(d) listing on edible fish tissue (whitefish 

samples from 1998, reported in EPA (2002a)). 

Extensive water sampling in 2007-08 failed to identify a single instance of chlordane exceeding 

either human health or aquatic life criteria in the Yakima mainstem, tributaries, or irrigation 

returns. One of the Yakima/Union Gap stormwater samples did however substantially exceed 

human health criteria for chlordane. 

The evidence suggests chlordane has been reduced to low levels in the Yakima system and is 

now an insignificant concern for human health and aquatic life in almost all areas. 
Yakima Pesticides/PCBs TMDL: Vol 1, WQ Study Findings 

Page 162 

Pollutants Not Exceeding Standards 

If it is determined that water quality standards are being met for a particular pollutant throughout 

the year, taking into account seasonal variations and critical conditions, and are not expected to 

be exceeded by the next 303(d) listing cycle, then a TMDL is not required. The Yakima River 

was listed for alpha-BHC, endosulfan, chlordane, and dioxin based on older data. The 2006-08 

studies show that alpha-BHC and endosulfan are now meeting water quality criteria. Chlordane 

is meeting criteria in all but one area. Dioxin is now meeting criteria in Keechelus Lake. 

Chlordane and alpha-BHC are no longer used, having been banned by EPA in the 1970s and 80s. 

Extensive monitoring of endosulfan in the lower Yakima River drainage has failed to detect a 

single recent violation of water quality criteria. The use of endosulfan is governed by FIFRA, 

EPA, and the WSDA. Chlordane, alpha-BHC, and endosulfan levels are not expected to exceed 

standards in the Yakima River in the future. A similar conclusion applies to dioxin, as 

previously discussed. For these reasons, TMDLs are no longer required for these chemicals for 

the WRIAs shown in Table 60. 

Table 60. Locations and Pollutants Where a TMDL is No Longer Required. 

Keechelus 

Lake 

(WRIA 39 

Upper 

Yakima River 

(WRIA 39) 

Lower 

Yakima River 

(WRIA 37) 

Dioxin Chlordane Endosulfan 

Alpha-BHC 

Number of 2008 303(d) Listings Removed 

1 1 8 
Yakima Pesticides/PCBs TMDL: Vol 1, WQ Study Findings 

Page 163 

Numeric TMDL Targets 

Numeric water quality targets must be identified in a TMDL. The targets identify the specific 

instream goals or criteria for the TMDL, which equate to attainment of water quality standards. 

In most cases targets are set equal to the water quality criteria. 

Pesticide and PCB Targets 

Applicable water quality criteria for all 303(d) listed chemicals in the Yakima basin were 

previously listed in Table 3. Compliance with a subset of these criteria has been identified as a 

major water quality issue. These criteria provide numeric targets for the Pesticides and PCBs 

TMDL (Table 61). 

Table 61. Numeric TMDL Targets (Water Quality Criteria) for Pesticides and PCBs That 

Currently Exceed Standards in the Yakima River, Tributaries, or Irrigation Returns 

(ng/L = parts per trillion). 

Pollutant Numeric Target 

(ng/L) Protective of: 

DDT 0.59 Human health for the average fish consumer 

DDE 0.59 Human health for the average fish consumer 

DDD 0.83 Human health for the average fish consumer 

Total DDT 1.0 Aquatic life for chronic exposure 

Dieldrin 0.14 Human health for the average fish consumer 

Chlordane 0.57 Human health for the average fish consumer 

Chlorpyrifos 

41 Aquatic life for chronic exposure 

83 Aquatic life for acute exposure 

Total PCBs 0.17 Human health for the average fish consumer 

Toxaphene 

0.20 Aquatic life for chronic exposure 

0.73 Human health for the average fish consumer 

Suspended Sediment and Turbidity Targets 

Numeric targets for turbidity and TSS have been set by the existing Yakima River suspended 

sediment and pesticide TMDLs (Table 62). 

The 7 mg/L TSS target for the lower Yakima River was intended to meet the 1 ng/L chronic 

aquatic life criterion for total DDT. Seven mg/L was derived by correlating total DDT 

concentrations with the corresponding TSS concentrations, using data collected during the 
Yakima Pesticides/PCBs TMDL: Vol 1, WQ Study Findings 

Page 164 

irrigation season from 1988-1995. Recognizing that the relationship between DDT and TSS was 

likely to change as soil erosion was brought under control, the TMDL stipulated the target should 

be re-evaluated in 2007. A TSS target of 7 mg/L equates to less than 4 NTU, which is below 

background for the lower Yakima River. 

Table 62. Existing TMDL Targets for Turbidity and Total Suspended Solids in the Yakima 

River.

Pollutant Numeric Target Applies To: Intent 

Upper Yakima River

Turbidity 

< 10 NTU 

over background 

Mainstem and selected 

tributaries (2006 target) Compliance with 

<5 NTU state turbidity standards 

over background 

Mainstem and selected 

tributaries (2011 target) 

Lower Yakima River

Turbidity 

<5 NTU 

over background 

Mainstem (2002 target; 

extended to 2003) 

Compliance with 

state turbidity standards 

25 NTU 

(90th percentile) 

All points within 

all tributaries and drains 

(2007 target) 

Protect fish and other aquatic 

organisms; assist with turbidity 

compliance in mainstem 

Total 

Suspended Solids 

7 mg/L 

(1 ng/L total DDT) 

Mainstem, tributaries, 

and drains (2012 target; 

re-evaluate in 2007) 

Achieve total DDT 

chronic aquatic life criterion 

A USGS study in 1999-2000 found the amount of total DDT associated with suspended sediment 

had indeed decreased in the lower Yakima River compared to the pre-TMDL period (Fuhrer et 

al., 2004). Fuhrer suggests several possible reasons for the decline: (1) degradation of total DDT 

in soils and bed sediments; (2) dilution of suspended sediment with uncontaminated eroded soils; 

or (3) use of PAM (polyacrylamide) in the flocculation and sedimentation of fine-grained, 

organically enriched soil particles that tend to sorb total DDT. The report concluded that 

“...the total DDT criterion could be met when concentrations of suspended sediment are well 

above 7 mg/L”. 

The total DDT:TSS correlation observed in 1988-1995 is shown in Figure 68 and compared to 

similar data from the 2007 irrigation season. The original correlation was based on pooled data 

for the mainstem, tributaries, and irrigation returns (N= 71). The same or similar locations were 

used to assess the correlation for 2007 (N= 95). 

As shown in this figure, total DDT and TSS concentrations had shifted downward by an order of 

magnitude in 2007 compared to 1988-1995. Total DDT had commonly been seen in the range of 

10-100 ng/L, but now rarely exceeds 5 ng/L. Whereas TSS once approached 1,000 mg/L, 

current levels are below 200 mg/L. Total DDT and suspended sediment concentrations have 

obviously decreased to a substantial extent. 
Yakima Pesticides/PCBs TMDL: Vol 1, WQ Study Findings 

Page 165 

Figure 68. Total DDT:TSS Correlation in the Lower Yakima River Drainage: 1988-1995 vs. 

2007 Irrigation Seasons.

The R2 values in these relationships indicate the percent of the DDT data that is explained by 

TSS (coefficient of determination). The correlation was not as strong in 2007 because the data 

now cover a much narrower range of concentrations, with many of the results being close to the 

detection limit and thus more scatter in the data. 

A stronger correlation (R2 = 0.50) results when the 2007 and 2008 data are pooled (Figure 69, 

N= 144). The mainstem data for the December 2007 storm were excluded here because the TSS 

concentrations were extreme outliers that had an undue influence on the correlation. Yakima at 

Harrison Bridge data were not used because DDT compounds were never detected. 

Solving this regression equation for 1 ng/L total DDT gives 32 mg/L TSS, a value four times 

higher than the original 7 mg/L target. While there is more uncertainty associated with this new 

value, the 2007-08 data represent an improvement over what was available in 1988-95 with 

respect to sample size and equitable distribution across the study area. 

Based on the TSS and turbidity data collected in 2007-08, 32 mg/L equates to 13 NTU (Figure 

70). The existing TMDL target for meeting the state turbidity criteria in the lower Yakima 

mainstem is background + 5 NTU. Background is typically at or below 10 NTU (see Table 36). 

Thus, the target would normally be 15 NTU or less. Therefore, the existing TMDL turbidity 

target of background + 5 NTU should be effective for the mainstem in both meeting a total DDTbased TSS target of 32 mg/L and in achieving compliance with the turbidity criteria. 

y = 0.1513x0.953

R2 = 0.75

y = 0.0598x0.7868

R2 = 0.43

0.01

0.1

1

10

100

1000

1 10 100 1000

Total DDT (ng/L)

TSS (mg/L)

1988‐1995

2007
Yakima Pesticides/PCBs TMDL: Vol 1, WQ Study Findings 

Page 166 

Figure 69. Total DDT:TSS Correlation in the Lower Yakima River Drainage, April 2007-March 

2008.

Figure 70. Relationship between Turbidity and Total Suspended Solids in the Lower Yakima 

River Drainage during 2007-08 (pooled results from monthly monitoring of the Yakima 

mainstem, Naches River, and the four major irrigation returns, N = 167).

y = 0.0617x0.7997

R2 = 0.50

0.01

0.1

1

10

100

0.1 1 10 100 1000

Total DDT (ng/L)

TSS (mg/L)

y = 0.8375x0.7933

R2 = 0.89

0.1

1

10

100

1000

1 10 100 1000

Turbidity (NTU)

TSS (mg/L)
Yakima Pesticides/PCBs TMDL: Vol 1, WQ Study Findings 

Page 167 

A 32 mg/L target would be under-protective for irrigation returns since these sometimes exceed 

the total DDT criterion at lower TSS levels. There was a good correlation between total DDT 

and TSS in Moxee Drain (R2

=0.76) and in Spring Creek (R2= 0.59) during 2007-08 (Figure 71). 

The data indicate that TSS concentrations of 29 and 19 mg/L, respectively, correspond to the 

1 ng/L total DDT criterion. These concentrations equate to turbidities of 11 and 8 NTU, 

respectively. Thus, a turbidity target of 10 NTU appears to be appropriate for these discharges. 

Figure 71. Total DDT:TSS Correlation in Moxee Drain and Spring Creek during April 2007-

March 2008. 

 

y = 0.1406x0.5815

R2 = 0.76

0.01

0.1

1

10

1 10 100 1000

Total DDT (ng/L)

TSS (mg/L)

Moxee Drain

Aquatic Life Criterion

y = 0.2959x0.4135

R2 = 0.59

0.1

1

10

0.1 1 10 100 1000

Total DDT (ng/L)

TSS (mg/L)

Spring Creek

Aquatic Life Criterion
Yakima Pesticides/PCBs TMDL: Vol 1, WQ Study Findings 

Page 168 

Total DDT also increased with TSS in Sulphur Creek Wasteway, although concentrations varied 

widely at higher TSS levels, reducing the strength of the correlation (Figure 72). Under 

conditions of 10 NTU (~25 mg/L TSS) total DDT concentrations were always less than 2 ng/L. 

Therefore, a 10 NTU target for Sulphur Creek also looks reasonable at the present time. 

Figure 72. Total DDT:TSS Correlation in Sulphur Creek Wasteway during April 2007-March 

2008.

Granger Drain consistently exceeded the 1 ng/L criterion by factors of 2 to 4 or more, and there 

was no clear relationship between total DDT and TSS (Figure 73). The absence of even a 

modest correlation suggests that source areas within the drainage have substantially different 

total DDT:TSS signatures and that these areas are active at different times of the year. 

It is uncertain what reductions in TSS would be required to meet the total DDT criterion in 

Granger Drain. Turbidity exceeded 10 NTU most of the time during 2007-08 (74% of samples). 

Therefore, a 10 NTU target for Granger Drain would be a useful interim goal for improving 

water quality and bringing this discharge closer into compliance with the total DDT criterion. 

The DDE human health criterion is 40% lower than the total DDT aquatic life criterion (0.59 vs. 

1.0 ng/L). There was a consistent relationship between DDE and total DDT across the study area 

(Figure 74). This correlation indicates that when the total DDT concentration is 1 ng/L, DDE 

should be in the neighborhood of 0.7 ng/L. In other words, when the aquatic life criterion is 

being achieved (< 1 ng/L), the human health criterion should be achieved or close to being 

achieved as well (<0.7 ng/L vs. 0.59 ng/L). Therefore the turbidity targets proposed here should 

be adequate to gauge progress toward meeting both criteria. A similar conclusion applies to the 

human health criterion specific to DDT since it is the same as the DDE criterion and ambient 

concentrations of DDT are lower than DDE. 

y = 0.8138x0.237

R2 = 0.34

1

10

1 10 100

Total DDT (ng/L)

TSS (mg/L)

Sulphur Creek

Aquatic Life Criterion
Yakima Pesticides/PCBs TMDL: Vol 1, WQ Study Findings 

Page 169 

Figure 73. Total DDT:TSS Correlation in Granger Drain during April 2007-March 2008.

Figure 74. Relationship Between DDE and Total DDT in the Yakima River, Tributaries, and 

Irrigation Returns during 2007-08 [excluded data: Yakima River at Harrison Bridge and high 

DDT outliers for Granger Drain (1/10/08) and Spring Creek (4/5/07)].

 

y = 1.9772x0.1492

R2 = 0.04

1

10

100

1 10 100 1000

Total DDT (ng/L)

TSS (mg/L)

Granger Drain

Aquatic Life Criterion

y = 0.7354x + 0.0191

R2 = 0.98

0

0.5

1

1.5

2

2.5

3

3.5

4

4.5

0123456

DDE (ng/L)

Total DDT (ng/L)
Yakima Pesticides/PCBs TMDL: Vol 1, WQ Study Findings 

Page 170 

Not enough samples were collected from other lower Yakima River tributaries and irrigation 

returns to have confidence in determining appropriate turbidity targets to meet water quality 

criteria for DDT compounds. The amount of total DDT associated with suspended matter is 

relatively high in some of these discharges. Figure 75 shows how total DDT compares to a 

turbidity target of 10 NTU at the 12 screening survey sites where the 1 ng/L was exceeded on at 

least one occasion. Approximately 30% of the samples exceeded 1 ng/L at 10 NTU or less. 

Under current conditions, turbidities less than 5 NTU might be required to meet the criterion. 

For sake of consistency, an interim TMDL target of 10 NTU is proposed for irrigation returns 

basin-wide, recognizing that the total DDT:TSS ratio will decrease over time as erosion is 

brought under further control. 

Figure 75. Total DDT vs. Turbidity in Selected Tributaries and Irrigation Returns from the 

2007-08 Screening Survey, Highlighting Low Turbidity Samples that Exceeded the 1 ng/L Total 

DDT Criterion.

Based on the preceding analysis, a revised set of TMDL targets is proposed for turbidity in the 

lower Yakima River (Table 63). They include a significant easing of restrictions put in place by 

the previous TMDL. 

In keeping with the previous TMDL, the turbidity targets for tributaries and irrigation returns 

would be applied to the 90th percentile. In this way, only 10% of the turbidities should exceed 

the target, and the average turbidity should be below the target. Compliance could be assessed 

separately for the irrigation season and non-irrigation season. 

 

0.1

1

10

0.1 1 10 100

Total DDT (ng/L)

Turbidity (NTU)

Other Tributaries and Returns

> 1 ng/L @ <10 NTU
Yakima Pesticides/PCBs TMDL: Vol 1, WQ Study Findings 

Page 171 

Table 63. Revised TMDL Targets Proposed for Turbidity in the Lower Yakima River. 

Existing Target Revised Target Applies To: Intent 

<5 NTU over 

background 

(no change) 

Mainstem Compliance with state turbidity 

standards 

25 NTU 

(90th percentile) 

All points within 

all tributaries 

and drains 

Protect fish and other aquatic 

organisms; assist with turbidity 

compliance in mainstem 

7 mg/L TSS 

(~4 NTU) 

Increase to 

<5 NTU over 

background 

Mainstem 

Compliance with total DDT chronic 

aquatic life criterion and DDT/DDE 

Increase to human health criteria 

10 NTU 

(90th percentile) 

Mouths of 

all tributaries 

and drains 

Similar targets could not be derived or are not appropriate for the other 303(d) listed chemicals 

or for toxaphene. Except for Spring Creek (R2

 = 0.58), dieldrin was weakly correlated or 

inversely correlated with TSS and appears to occur primarily in dissolved form. The previous 

TMDL concluded that establishing TSS or turbidity goals for dieldrin would not be suitable 

(Joy and Patterson, 1997). 

Endosulfan and chlorpyrifos concentrations are a function of how and when they are used. The 

levels encountered in surface water are unrelated to TSS. 

The PCB and toxaphene data obtained on surface water were limited to measuring long-term 

average concentrations which cannot be correlated with TSS. PCBs, however, have an affinity 

for suspended matter that is equal to or greater than DDT compounds. Thus, achieving the 

turbidity targets could also be an effective control measure for PCBs. 

Toxaphene does not sorb as strongly to suspended matter. The toxaphene problem in the lower 

Yakima River drainage could be the result of localized contamination rather than wide-spread 

soil contamination as with DDT and dieldrin. Thus, source investigation is indicated as a first 

step toward reducing toxaphene levels. 

 
Yakima Pesticides/PCBs TMDL: Vol 1, WQ Study Findings 

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Yakima Pesticides/PCBs TMDL: Vol 1, WQ Study Findings 

Page 173 

Loading Capacity 

Determining a waterbody’s loading capacity for a pollutant is the basis for developing a TMDL. 

Loading capacity is the maximum amount of a pollutant that can be delivered to a waterbody and 

still achieve water quality standards. 

The portion of a receiving water’s loading capacity assigned to a particular source is a load 

(nonpoint sources) or wasteload (point sources) allocation. By definition, a TMDL is the sum 

of the allocations, which must not exceed the loading capacity. Load and wasteload allocations 

for the chemicals of concern in this TMDL will be addressed in a separate Water Quality 

Improvement Report to EPA, to be prepared by the Ecology Water Quality Program at a later 

date. 

Loading capacity can be calculated by multiplying streamflow by the pollutant’s water quality 

criterion. For carcinogens, EPA recommends using the long-term harmonic mean flow, since the 

adverse impacts to fish consumers are realized over a lifetime of exposure (EPA, 1991). 

Harmonic mean is the appropriate measure of central tendency when dealing with rates, in this 

case rates of flow. The harmonic mean is less than the arithmetic mean and is expressed as Qhm

= n/∑(1/Qi), where n is the number of recorded flows and ∑(1/Qi) is the sum of the reciprocals of 

the flows. 

As noted by EPA (1991a), the harmonic mean “provides a more reasonable estimate than the 

arithmetic mean to represent long-term average river flow. Flood periods in rivers bias the 

arithmetic mean above the flows typically measured. This overstates available dilution. The 

calculation of the harmonic mean, however, dampens the effect of peak flows. As a result, bias 

is reduced. The harmonic mean is also an appropriate conservative estimate of long-term 

average flow in highly regulated river basins, such as the Columbia. In a regulated river basin, 

the harmonic mean and the arithmetic average are often much closer numerically.” 

Loading capacities to meet human health criteria in the mainstem Yakima River are calculated 

for DDE, dieldrin, chlordane toxaphene, and total PCBs in Table 64. The formula is: loading 

capacity (grams per day) = harmonic mean flow (cfs) x concentration (ng/L) x .00245. The 

human health criteria apply individually to DDT, DDE, and DDD (there is no human health 

criterion for total DDT). Among these, DDE is the primary concern for fish consumption. 

Loading capacity was assessed for four points in the system: Keechelus Lake, Kachess Lake, the 

upper Yakima River near Umtanum (Yakima Canyon above the city of Yakima), and the lower 

Yakima River at Kiona. Keechelus Lake has a separate 303(d) listing for PCBs. Kachess Lake 

qualifies for a PCB listing based on results of Ecology’s 2006 fish tissue survey. Umtanum 

represents the loading capacity of the Yakima River as it enters the lower Yakima basin. Kiona 

is the mainstem site with a long-term record of flow that is furthest downstream from the major 

pesticide and PCB inputs to the lower river. 

 
Yakima Pesticides/PCBs TMDL: Vol 1, WQ Study Findings 

Page 174 

Table 64. Loading Capacity Estimates for Meeting Human Health Criteria for DDT 

Compounds, Dieldrin, Chlordane, Toxaphene, and PCBs in the Yakima River. 

Waterbody 

and Location 

Mean 

Flow 

(cfs) 

Loading Capacity (grams per day) 

Pollutant: DDE Dieldrin Chlordane Toxaphene Total 

PCBs 

Criterion 

(ng/L): 0.59 0.14 0.57 0.73 0.17 

Keechelus Lake 338† * * * * 0.14 

Kachess Lake 292† * * * * 0.12 

Yakima River 

near Umtanum 

(r.m. 140.5) 

1,548†† 2.2 0.53 2.2 2.8 0.64 

Yakima River 

at Kiona 

(r.m. 29.9) 

2,279†† 3.3 0.78 3.2 4.2 0.95 

*Human health criterion not exceeded in Keechelus or Kachess Lakes. †

Arithmetic mean (Yakima River at Martin, 1994-2007 and Kachess Lake Reservoir). 

††Harmonic mean (1994-2007).

Loading capacity was not calculated for DDT compounds, dieldrin, or toxaphene in Keechelus or 

Kachess Lakes because water quality criteria are currently being met. The previous TMDLs 

calculated loading capacities for TSS in the upper and lower Yakima River. 

Flow data were obtained from the USBR Yakima Project Hydromet website 

(www.usbr.gov/pn/hydromet/yakima.html). 1994-2007 was selected as the period of interest. 

Instream flow limits for the lower Yakima River were established in 1994. Complete flow data 

were available through 2007, as of this writing. 

The loading capacity for PCBs in Keechelus Lake and Kachess Lake was based on the flow at 

the outlet (Yakima River at Martin and Kachess Lake Reservoir). Outflow was assumed equal 

to inflow. This ignores loss of PCBs due to evaporation and sedimentation, resulting in a 

conservative estimate of loading capacity. The arithmetic rather than harmonic mean was used 

here because mixing of inflows within a lake is an averaging process. 

The loading capacity of the Yakima River for DDE and dieldrin is estimated at 2.2 and 0.53 

grams per day, respectively, at Umtanum, increasing to 3.3 and 0.78 grams per day by Kiona. 

For chlordane, loading capacities at these points are 2.2 and 3.2 grams per day. The estimates 

for total PCBs range from 0.12 grams per day in Kachess Lake to 0.95 grams per day at Kiona. 

Loading capacities of 2.8 – 4.2 grams per day were estimated for toxaphene. 

Loading capacity for meeting the chronic aquatic life criteria for total DDT and toxaphene was 

calculated in a similar fashion (Table 65). While minimums are often used as the design flow for 

aquatic life criteria, low flow is not the critical period for these chemicals. During 2007-08, the 

lower river approached or exceeded the total DDT criterion only when flows and TSS were up, 
Yakima Pesticides/PCBs TMDL: Vol 1, WQ Study Findings 

Page 175 

either in the first part of the irrigation season or during the winter. Higher toxaphene 

concentrations were recorded early in the irrigation season than after the end of irrigation. 

Therefore, loading capacities for compliance with the chronic aquatic life criteria for total DDT 

and toxaphene were based on the long-term harmonic mean flow, for additional reasons 

explained above. 

Table 65. Loading Capacity Estimates for Meeting Chronic Aquatic Life Criteria for Total DDT 

and Toxaphene in the Yakima River. 

Waterbody 

and Location 

Mean 

Flow 

 (cfs) 

Loading Capacity (grams per day) 

Pollutant: Total DDT Toxaphene 

Criterion 

(ng/L): 1.0 0.2 

Yakima River 

near Umtanum 

(r.m. 140.5) 

1,548† 3.8 0.76 

Yakima River 

at Kiona 

(r.m. 29.9) 

2,279†

 5.6 1.1 

†

Harmonic mean (1994-2007). 

Because of its lower persistence and minimal bioaccumulation potential, chlorpyrifos is a water 

quality concern only during the growing season, in and around the times it is applied. In contrast 

to total DDT and toxaphene, the Yakima River is most vulnerable to the adverse impacts of 

chlorpyrifos during the minimum flows of late summer and fall. For toxic wasteload allocation 

studies in which the hydrologically-based method is used, EPA recommends 7Q10 (seven-day, 

10-year, low flow) as the design flow for the chronic criteria and the 1Q10 (one-day, 10-year, 

low flow) as the design flow for the acute criteria (EPA, 1991b). 

Therefore, loading capacities for chlorpyrifos were based on the 7Q10 and 1Q10. Flow statistics 

were calculated using EPA’s DFLO 3.1 tool http://epa.gov/waterscience/models/dflow/. 

Flow data for 1994-2007 were downloaded from the USGS website 

http://waterdata.usgs.gov/wa/nwis/sw . Results are shown in Tables 66 and 67. Loading 

capacity estimates for chlorpyrifos range from 54 – 112 grams per day. 

 
Yakima Pesticides/PCBs TMDL: Vol 1, WQ Study Findings 

Page 176 

Table 66. Loading Capacity Estimates for Meeting Chronic Aquatic Life Criterion for 

Chlorpyrifos in the Yakima River. 

Waterbody 

and Location 

7Q10 

Flow* 

 (cfs) 

Loading Capacity 

(grams per day) 

Pollutant: Chlorpyrifos 

Criterion 

(ng/L): 41 

Yakima River 

near Umtanum 

(r.m. 140.5) 

538 54 

Yakima River 

at Kiona 

(r.m. 29.9) 

636 64 

*Seven-day, 10-year low flow, 1994-2007. 

Table 67. Loading Capacity Estimates for Meeting Acute Aquatic Life Criterion for 

Chlorpyrifos in the Yakima River. 

Waterbody 

and Location 

1Q10 

Flow* 

 (cfs) 

Loading Capacity 

(grams per day) 

Pollutant: Chlorpyrifos 

Criterion 

(ng/L): 83 

Yakima River 

near Umtanum 

(r.m. 140.5) 

514 105 

Yakima River 

at Kiona 

(r.m. 29.9) 

551 112 

*One-day, 10-year low flow, 1994-2007. 

The loading capacity for chemicals of concern in the Naches River, lower Yakima River, and 

their tributaries and irrigation returns will be determined in the Water Quality Improvement 

Report scheduled to be completed by the Ecology Water Quality Program at a later date.
Yakima Pesticides/PCBs TMDL: Vol 1, WQ Study Findings 

Page 177 

Pollutant Reductions Needed 

Reductions in pollutant levels will be needed to meet water quality standards and TMDL targets 

for turbidity, pesticides, and PCBs in the Yakima River. Estimates of the percent reductions 

needed for the mainstem are provided below. The reductions required for point and nonpoint 

discharges to the Yakima River will be addressed in the TMDL Water Quality Improvement 

Report to EPA. 

Turbidity 

The turbidity reductions needed in the lower Yakima River mainstem to meet the target set by 

the existing TMDL are shown in Table 68. During the first part of the 2007 irrigation season, 

the higher turbidities recorded for the Yakima River at Euclid and at Kiona exceeded the TMDL 

target by 4-12 NTU. These turbidity levels would need to be reduced by 26-39% to meet the 

target. The river was consistently meeting the turbidity target further upstream at Parker. 

Table 68. Percent Reductions Needed to Meet the Existing TMDL Turbidity Target in the 

Lower Yakima River Mainstem during the 2007 Irrigation Season. 

Location/ 

Waterbody 

Existing 

TMDL 

Target 

Range of Values 

Exceeding Target During 

2007 Irrigation Season 

Percent 

Reduction 

Needed 

Yakima R. 

at Euclid Background 

+ 5 NTU 

15-27 NTU 26-39% 

Yakima R. 

at Kiona 16-32 NTU 26-37% 

Pesticides and PCBs 

Because of variability in the water quality data, the pesticide and PCB reductions needed for the 

lower mainstem (Table 68) were based on water column concentrations estimated from the 2006 

fish tissue survey and EPA bioconcentration factors. Fish integrate pollutant levels in the water 

over time and, thus, can provide a more representative estimate of ambient concentrations. 

Median concentrations for the edible fish tissue samples collected from Toppenish to Horn 

Rapids were used in the estimates (N=29, see Table 7). The reduction for chlordane is for 

Prosser carp, the only location and species that exceeded criteria. 

Reductions needed to meet human health criteria in lower Yakima River fish are estimated to 

be in the range of 31-68% for DDE, dieldrin, and total PCBs. 10% and 19% reductions are 

indicated for toxaphene and chlordane, respectively. Greater or lesser reductions than those 

indicated in Table 69 would be required depending on species and location. Year-to-year 

differences in water supply, which affects dilution, will also influence pesticide and PCB 

residues in Yakima River fish. 
Yakima Pesticides/PCBs TMDL: Vol 1, WQ Study Findings 

Page 178 

Table 69. Estimates of Loading Reductions Needed in the Mainstem Lower Yakima River to 

Meet Human Health Criteria of DDE, Dieldrin, Chlordane, Toxaphene, and Total PCBs 

[Based on edible fish tissue data in Johnson et al. (2007).] 

Pollutant 

Median 

Fish 

Tissue 

Concentration 

(ug/Kg) 

EPA 

Bioconcentration 

Factor 

(L/Kg) 

Estimated 

Water 

Column 

Concentration 

(ng/L) 

Estimated 

Load 

@ Kiona* 

(grams/day) 

Loading 

Capacity 

(grams/day) 

Difference 

(grams/day) 

Percent 

Reduction 

Needed 

DDE 91 53,600 1.7 9.5 3.3 6.2 65% 

Dieldrin 1.0 4,670 0.21 1.2 0.78 0.4 33% 

Chlordane 10 14,100 0.71 4.0 3.2 0.8 19% 

Toxaphene 11 13,100 0.84 4.7 4.2 0.5 10% 

Total PCBs 17 31,200 0.54 3.0 0.95 2.1 69% 

*at 2,279 cfs (1994-2007 harmonic mean flow). 

PCBs also exceed human health criteria in the mainstem upper Yakima River, as well as the 

Keechelus and Kachess reservoirs. By the same calculation as above, a 60% reduction in the 

load appears to be needed for PCBs in the upper mainstem. A similar reduction (59%) applies to 

PCB levels in fish in the storage reservoirs. DDE, dieldrin, chlordane, and toxaphene were either 

meeting or close to meeting water quality criteria in both the upper river and storage reservoirs 

(Table 7). 

Chlorpyrifos is not a human health concern in Yakima River fish tissue. Although substantial 

increases in chlorpyrifos concentrations were observed in water samples from the mainstem 

lower Yakima River during the 2007 irrigation season, exceedances of aquatic life criteria were 

only observed in irrigation returns. Reductions needed for chlorpyrifos will be addressed in the 

TMDL Water Quality Improvement Report. 
Yakima Pesticides/PCBs TMDL: Vol 1, WQ Study Findings 

Page 179 

Conclusions 

Results of this 2007-08 study support the following conclusions: 

 Despite significant reductions in soil erosion, irrigation returns continue to discharge elevated 

levels of suspended sediment that contribute to exceedances of Washington State turbidity 

and pesticide criteria in the lower Yakima River. 

 A first-time effort to characterize chemical contaminants in urban stormwater discharges to 

the Yakima River found high levels of pesticides, PCBs, TSS, and turbidity in runoff from 

the cities of Yakima, Union Gap, and Ellensburg (pesticides not analyzed). 

 The lower Yakima River and some of its tributaries and irrigation returns fail to meet 

(exceed) Washington State human health criteria for fish consumption for DDE, dieldrin, 

toxaphene, PCBs, and, marginally, chlordane. 

 Toxaphene sometimes exceeds aquatic life criteria in the lower Yakima River and certain of 

its tributaries, and irrigation returns. 

 Peak chlorpyrifos concentrations in some of the same returns exceed aquatic life criteria 

during the spring and fall when this insecticide is being applied. 

Irrigation returns are the predominant cause of degraded water quality in the Yakima River. 

These are the most important sources to control for reducing the adverse effects of elevated 

turbidity, pesticides, and PCBs. Urban stormwater runoff also appears to be a significant source 

of these same pollutants and follows in the priority of sources that need to be reduced. 

This study found that reductions are also needed for PCBs in wastewater treatment plant 

(WWTP) effluent and several pesticides in fruit packer and vegetable processor effluent, if these 

facilities are to meet water quality criteria at the point of discharge. However, these are 

relatively low volume discharges. Except for the current use insecticides chlorpyrifos and 

endosulfan, pesticides were not analyzed to a low enough level in WWTP effluent to rule out 

exceedances of water quality criteria. Thus, some further reductions could ultimately be needed. 

 
Yakima Pesticides/PCBs TMDL: Vol 1, WQ Study Findings 

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Yakima Pesticides/PCBs TMDL: Vol 1, WQ Study Findings 

Page 181 

Recommendations 

303(d) Listings/TMDL 

1. The current (2008) Water Quality Assessment 303(d) listings are appropriate for total DDT, 

DDE, dieldrin, chlordane, chlorpyrifos, PCBs, and dioxin for those areas indicated in 

Table 58. 

2. DDT compounds, dieldrin, chlordane chlorpyrifos, toxaphene, and PCBs should be addressed 

in the TMDL Water Quality Improvement Report to EPA. 

3. Following approval of the TMDL, toxaphene should be added to the Category 4A (has an 

approved TMDL) listings for the Yakima River watershed. 

4. The next water quality assessment process should remove endosulfan and alpha-BHC from 

the 303(d) list for the lower Yakima River (WRIA 37) and placed them in Category 1 

(Meets Standards). 

5. The 303(d) listing for chlordane in the upper Yakima River (WRIA 39) should be removed 

and placed in Category 1. 

6. The 303(d) listing for dioxin in Keechelus Lake (WRIA 39) should be removed and placed in 

Category 1. 

Source Tracing 

7. Work with city and county officials to identify sources of pesticides, PCBs, suspended 

sediment, and turbidity in stormwater from Yakima, Union Gap, Selah, and Ellensburg 

(PCBs only). Improving current understanding of spatial and temporal variability should be 

among the first steps in this effort. 

8. Identify sources of toxaphene to Wilson Creek, Moxee Drain, Granger Drain, and, especially, 

Sulphur Creek Wasteway. Screen other tributaries and irrigation returns for the presence of 

toxaphene. 

9. Identify PCB sources to Sulphur Creek Wasteway and Granger Drain. 

Monitoring 

10. Characterize dry weather discharge (winter and irrigation season) of pesticides, PCBs, 

suspended sediment, and turbidity from Yakima area storm drains. 
Yakima Pesticides/PCBs TMDL: Vol 1, WQ Study Findings 

Page 182 

11. Work with the U.S. Bureau of Reclamation, the Yakama Nation, irrigation districts, 

conservation districts, and other interested parties to continue and, where appropriate, 

expand turbidity monitoring of priority irrigation returns identified through the present study. 

12. Explore the possibility of installing a continuous turbidity monitor in the Yakima River at 

Kiona. 

13. Continue chlorpyrifos monitoring in Sulphur Creek Wasteway, Spring Creek, and Marion 

Drain through Ecology’s Surface Water Monitoring Program for Pesticides in SalmonidBearing Streams. 

14. Periodically monitor lower Yakima River fish for DDE, dieldrin, chlordane, toxaphene, 

PCBs, and dioxin to assess progress toward meeting human health criteria and the need to 

continue the fish consumption advisory for PCBs. 
Yakima Pesticides/PCBs TMDL: Vol 1, WQ Study Findings 

Page 183 

References 

Agee, B. 1985. Toxics Substances Monitoring Program. California Water Resources Control 

Board, Water Quality Monitoring Report No. 85-1-WQ, Sacramento, CA. 

Anderson, R. 2008. Evaluation of the Effectiveness of Establishing Total Maximum Daily Load 

Targets on the Reduction in the Levels of Suspended Sediment and Turbidity in the Upper 

Yakima River. M.S. Thesis, Washington State University, Pullman, WA. 

ATSDR. 1996. Toxicological Profile for Toxaphene. Agency for Toxic Substances & Disease 

Registry, Department of Human and Health Services, Atlanta, Georgia. 

www.atsdr.cdc.gov/toxprofiles/tp94.html. 

ATSDR. 2000. Toxicological Profile for Polychlorinated Biphenyls (PCBs). Agency for Toxic 

Substances & Disease Registry, Department of Human and Health Services, Atlanta, Georgia. 

www.atsdr.cdc.gov/toxprofiles/tp17.html. 

Boucher, P.R. 1975. Sediment Transport by Irrigation Return Flows in Four Small Drains within 

the DID-18 Drainage of the Sulphur Creek Basin, Yakima County, Washington, April 1979 to 

October 1981. Water Resources Investigations Report 83-4167, U.S. Geological Survey, 

Tacoma, WA. 149 pp. 

Boucher, P.R. and M.O. Fretwell. 1982. Irrigation-water Quality in the Sulphur Creek Basin, 

Yakima and Benton Counties, Washington, April 1976 through March 1977. Open File Report 

81-1008. U.S. Geological Survey, Tacoma, WA. 68 pp. 

Burke, C., P. Anderson, D. Dugger, and J. Cowles. 2006. Surface Water Monitoring Program 

for Pesticides in Salmonid-Bearing Streams, 2003-2005. Washington State Department of 

Ecology and Washington State Department of Agriculture, Olympia, WA. Ecology 

Publication No. 06-03-036. www.ecy.wa.gov/biblio/0603036.html. 

Callahan, M.A. et al. 1979. Water-related Environmental Fate of 129 Priority Pollutants. 

EPA-440/4-79-029a. 

Carmack, K. 2008. Personal communication. Washington State Department of Ecology, 

Central Regional Office, Yakima, WA. 

CH2M Hill. 1975. Characterization of Present Water-quality Conditions in the Yakima Basin. 

Report to the Washington State Department of Ecology, Olympia, WA. Technical Bulletin 10. 

47 pp. 

Coffin, C. 2008. Personal communication, 9/05/08 email. Washington State Department of 

Ecology, Central Regional Office, Yakima, WA. 

Coffin, C. and A. Johnson. 2007 Draft. Quality Assurance Project Plan: TMDL Effectiveness 

Monitoring for the Upper Yakima River Suspended Sediment and Organochlorine Pesticide 

TMDL - An Addendum to the Yakima River Chlorinated Pesticide and PCB QAPP. 

Washington State Department of Ecology, Olympia, WA. 
Yakima Pesticides/PCBs TMDL: Vol 1, WQ Study Findings 

Page 184 

Coffin, C., R. Plotnikoff, and R. Anderson. 2006. Lower Yakima River Suspended Sediment 

Total Maximum Daily Load Study Water Quality Effectiveness Monitoring Report. 

Washington State Department of Ecology, Yakima, WA. Publication No. 06-03-014. 

www.ecy.wa.gov/biblio/0603014.html. 

Corps of Engineers. 1978. Yakima Valley Regional Water Management Study Volumes 1-4. 

U.S. Army Corps of Engineers, Seattle District, Seattle, WA. 

Creech, J. and J. Joy. 2002. Upper Yakima River Basin Suspended Sediment, Turbidity, and 

Organochlorine Pesticide Total Maximum Daily Load: Submittal Report. Washington State 

Department of Ecology, Olympia, WA. Publication No. 02-10-047-WQ. 

www.ecy.wa.gov/biblio/0210047.html. 

CRITFC. 1994. A Fish Consumption Survey of the Umatilla, Nez Perce, Yakama, and Warm 

Springs Tribes of the Columbia River Basin. Tech. Rept. 94-3. Columbia River Inter-Tribal Fish 

Commission, Portland, OR. 

Davis, D. 1993. Washington State Pesticide Monitoring Program – Reconnaissance Sampling 

of Surface Waters (1992). Washington State Department of Ecology, Olympia, WA. 

Publication No. 93-e09. www.ecy.wa.gov/biblio/93e09.html. 

Davis, D. 1996. Washington State Pesticide Monitoring Program – 1994 Surface Water 

Sampling Report. Washington State Department of Ecology, Olympia, WA. Publication No. 

96-305. www.ecy.wa.gov/biblio/96305.html. 

Davis, D. and A. Johnson. 1994. Washington State Pesticide Monitoring Program – 1993 

Surface Water Sampling Report. Washington State Department of Ecology, Olympia, WA. 

Publication No. 94-164. www.ecy.wa.gov/biblio/94164.html. 

Davis, D., A. Johnson, and D. Serdar. 1998a. Washington State Pesticide Monitoring Program – 

1995 Surface Water Sampling Report. Washington State Department of Ecology, Olympia, WA. 

Publication No. 98-300. www.ecy.wa.gov/biblio/98300.html. 

Davis, D., D. Serdar, and A. Johnson. 1998b. Washington State Pesticide Monitoring Program – 

1995 Fish Tissue Sampling Report. Washington State Department of Ecology, Olympia, WA. 

Publication No. 98-312. www.ecy.wa.gov/biblio/98312.html. 

Dolan, D.M., A.K. Yui, and R.D. Geist. 1981. Evaluation of River Load Estimation Methods 

for Total Phosphorus. J. Great Lakes Research 7(3):207-214. 

Dugger, D., C. Burke, J. Jorden, P. Anderson, D. Norton, and J. Cowles. 2008. Pesticides in 

Salmonid-Bearing Streams: Intensive Sampling in an Agricultural Drain, A Cooperative Study 

by the Washington State Department of Ecology and the Washington State Department of 

Agriculture. Ecology Publication No. 08-03-020. www.ecy.wa.gov/biblio/0803020.html. 

Ebbert, J.C. and S.S. Embrey. 2002. Pesticides in Surface Water of the Yakima River Basin, 

Washington, 1999–2000—Their Occurrence and an Assessment of Factors Affecting 

Concentrations and Loads. U.S. Geological Survey Water-Resources Investigations Report 

01–4211. http://or.water.usgs.gov/pubs/WRIR01-4211/index.html
Yakima Pesticides/PCBs TMDL: Vol 1, WQ Study Findings 

Page 185 

Ebbert, J.C., S.S. Embrey, and J.A. Kelley. 2002b. Concentrations and Loads of Suspended 

Sediment and Nutrients in Surface Water of the Yakima River Basin, Washington, 1999-2000 – 

With an Analysis of Trends in Concentrations. U.S. Geological Survey Water-Resources 

Investigations Report 03–4026. http://pubs.usgs.gov/wri/wri034026/

Edwards, C.A. 1973. Persistent Pesticides in the Environment. CRC Press, Cleveland, OH. 

Ecology. 1979. Irrigated Agriculture Water Quality Management Plan Section 208, 

P.L. 95-217. Washington State Department of Ecology, Water Quality Program, 

Olympia, WA. Report 79-5b. 55 pp. 

Ecology. 1996. Total Maximum Daily Load Guidelines. Washington State Department of 

Ecology, Olympia, WA. Publication No. 97-315. www.ecy.wa.gov/biblio/97315.html. 

Ecology, 2004. Stormwater Management Manual for Eastern Washington. Washington State 

Department of Ecology, Water Quality Program, Olympia, WA. Publication No. 04-10-076. 

www.ecy.wa.gov/biblio/0410076.html. 

Ecology. 2006. Assessment of Water Quality for the Clean Water Act Sections 303(d) and 

305(b) Integrated Report. WQP Policy 1-11, Revised: September, 2006. Water Quality 

Program, Washington State Department of Ecology. 

Ellis, G.S., J.N. Huckins, C.E. Rostad, C.J. Schmitt, J.D. Petty, and P. MacCarthy. 1995. 

Evaluation of Lipid-Containing Semipermeable Membrane Devices (SPMDs) for Monitoring 

Organochlorine Contaminants in the Upper Mississippi River. Environmental Toxicology 

Chemistry 14:1875-1884. 

EPA. 1990. Specifications and Guidance for Obtaining Contaminant-Free Sample Containers. 

U.S. Environmental Protection Agency. OSWER Directive #93240.0-05. 

EPA. 1991a. Total Maximum Daily Loading (TMDL) to Limit Discharges of 2,3,7,8-TCDD 

(Dioxin) to the Columbia River Basin. U.S. Environmental Protection Agency, Region 10, 

Seattle, WA. 

EPA. 1991b. Technical Support Document for Water Quality-based Toxics Control. 

U.S. Environmental Protection Agency. EPA/505/2-90-001. 

EPA. 1995. Guidelines for Preparation of the 1996 State Water Quality Assessment (305(b) 

reports). U.S. Environmental Protection Agency. EPA-841B-95-001. 

EPA. 2002a. Columbia River Basin Fish Contaminant Survey, 1996-1998. U.S. Environmental 

Protection Agency, Region 10, Seattle, WA. EPA-910/R-02-006. 

EPA. 2002b. Estimated Per Capita Fish Consumption in the United States. U.S. Environmental 

Protection Agency. EPA-821-R-00-025. 

Fuhrer, G., J. Morace, H.M. Johnson, J.F. Rinella, J.C. Ebbert, S.S. Embrey, I.R. Waite, 

K.D. Carpenter, D.R. Wise, and C.A. Hughes. 2004. Water Quality in the Yakima River Basin, 

Washington 1999-2000. U.S. Geological Survey Circular 1237, 34 p. 

http://pubs.usgs.gov/circ/2004/1237/pdf/circular1237.pdf
Yakima Pesticides/PCBs TMDL: Vol 1, WQ Study Findings 

Page 186 

Gary Struthers Associates, Inc. 2005. Okanogan Sewer Investigation Report: Lower Okanogan 

Sewer Investigation for PCBs and DDT. Prepared for Washington State Department of Ecology. 

Golding, S. 2002. Spokane Area Point Source PCB Survey, May 2001. Washington State 

Department of Ecology, Olympia, WA. Publication No. 02-03-009. 

www.ecy.wa.gov/biblio/0203009.html

Hallock, D. 2005. A Comparison of Water Quality Data Collected from Two Washington Rivers 

by the Department of Ecology and the U.S. Geological Survey. Washington State Department of 

Ecology, Olympia, WA. Publication No. 05-03-009. www.ecy.wa.gov/biblio/0503009.html

Hallock, D. 2007. Personal communication, 11/6/2008 email. Freshwater Monitoring Unit, 

Washington State Department of Ecology, Olympia, WA. 

Huckins, J.N., J.D. Petty, and K. Booij. 2006. Monitors of Organic Chemicals in the 

Environment: Semipermeable Membrane Devices. Springer Science and Business Media, 

New York, NY. 223 pp. 

Huckins, J.N., J.D. Petty, H.F. Prest, R.C. Clark, D.A. Alvarez, C.E. Orazio, J.A. Lebo, 

W.L. Cranor, and B.T. Johnson. 2000. A Guide to the Use of Semipermeable Membrane 

Devices (SPMDs) as Samplers of Waterborne Hydrophobic Organic Contaminants. 

U.S. Geological Survey, Columbia Environmental Research Center, Columbia MO. 

Hyne, R., F. Pablo, M. Aistrope, A.W. Leonard, and N. Ahmad. 2004. Comparison of TimeIntegrated Pesticide Concentrations Determined from Field-Deployed Passive Samplers with 

Daily River-Water Extractions. Environmental Toxicology Chemistry. 23(9):2090-2098. 

Johnson, A. 2007a. Quality Assurance Project Plan: Yakima River Chlorinated Pesticides, 

PCBs, Suspended Sediment, and Turbidity Total Maximum Daily Load Study. Washington 

State Department of Ecology, Olympia, Washington. Publication No. 07-03-107. 

www.ecy.wa.gov/biblio/0703107.html. 

Johnson, A. 2007b. Standard Operating Procedure for Using Semipermeable Membrane Devices 

to Monitor Hydrophobic Organic Compounds in Surface Water. Washington State Department 

of Ecology, Olympia, WA. 

Johnson, A., K. Seiders, and D. Norton. 2010. An Assessment of the PCB and Dioxin 

Background in Washington Freshwater Fish, with Recommendations for Prioritizing 303(d) 

Listings. Washington State Department of Ecology, Publication No. 10-03-007. 

www.ecy.wa.gov/biblio/0803102.html

Johnson, A, B. Era-Miller, and R. Coots. 2007. Chlorinated Pesticides, PCBs, and Dioxins in 

Yakima River Fish in 2006: Data Summary and Comparison to Human Health Criteria. 

Washington State Department of Ecology, Olympia, WA. Publication No. 07-03-036. 

www.ecy.wa.gov/biblio/0703036.html

 
Yakima Pesticides/PCBs TMDL: Vol 1, WQ Study Findings 

Page 187 

Johnson, A., B. Era-Miller, R. Coots, and S. Golding. 2004. A Total Maximum Daily Load 

Evaluation for Chlorinated Pesticides and PCBs in the Walla Walla River. Washington State 

Department of Ecology, Olympia, WA. Publication No. 04-03-032. 

www.ecy.wa.gov/biblio/0403032.html

Johnson, A. and C. Burke. 2006. Results from Monitoring Endosulfan and Dieldrin in Wide 

Hollow Creek. Washington State Department of Ecology, Olympia, WA. 

Publication No. 06-03-038. www.ecy.wa.gov/biblio/0603038.html

Johnson, A., D. Norton, and B. Yake. 1986. Occurrence and Significance of DDT Compounds 

and Other Contaminants in Fish, Water, and Sediment from the Yakima River Basin. 

Washington State Department of Ecology, Olympia, WA. Publication No. 86-5. 

www.ecy.wa.gov/biblio/865.html

Johnson, A., D. Norton, and B. Yake. 1988. Persistence of DDT in the Yakima River Drainage. 

Archives Environmental Contamination and Toxicology, 17(289-297). 

Joy, J. 2002. Upper Yakima River Basin Suspended Sediment and Organochlorine Pesticide 

Total Maximum Daily Load. Washington State Department of Ecology, Olympia, WA. 

Publication No. 02-03-012. www.ecy.wa.gov/biblio/0203012.html

Joy, J. 2005. Quality Assurance Project Plan: Yakima Area Creeks Fecal Coliform Total 

Maximum Daily Load Study. Washington State Department of Ecology, Olympia, WA. 

Publication No. 05-03-101. www.ecy.wa.gov/biblio/0503101.html

Joy, J. and B. Patterson. 1997. A Suspended Sediment and DDT Total Maximum Daily Load 

Evaluation Report for the Yakima River. Washington State Department of Ecology, Olympia, 

WA. Publication No. 97-321. www.ecy.wa.gov/biblio/97321.html 

Karickhoff, S.W. 1981. Semi-empirical Estimation of Sorption of Hydrophobic Pollutants on 

Natural Sediments and Soils. Chemosphere 10(8):833-846. 

Levigne, R. 1997. Waters of the U.S. Memorandum to Carl Nuechterlein from Ronald L. 

Levigne, Assistant Attorney General, Ecology Division, February 6, 1007. 

Lombard, S. and C. Kirchmer. 2004. Guidelines for Preparing Quality Assurance Project Plans 

for Environmental Studies. Washington State Department of Ecology, Olympia, WA. 

Publication No. 04-03-030. www.ecy.wa.gov/biblio/0403030.html. 

Lubliner, B., J. Ross, and J. Ryf. 2006. Pullman Stormwater Pilot Study for Pesticides, PCBs, 

and Fecal Coliform Bacteria, 2005-2006. Washington State Department of Ecology, Olympia, 

WA. Publication No. 06-03-034. www.ecy.wa.gov/biblio/0603034.html

Lubliner, B. 2007. PCB Monitoring at Walla Walla and College Place W, 2007-07. Washington 

State Department of Ecology, Olympia, WA. Publication No. 07-03-046. 

www.ecy.wa.gov/biblio/0703046.html

Lubliner, B. 2009. PCB and Dieldrin Monitoring in the Palouse River Watershed, 2007-008: 

Wastewater Treatment Plants and Abandoned Landfills. Washington State Department of 

Ecology, Olympia, WA. Publication No. 09-03-004. www.ecy.wa.gov/biblio/0903004.html. 
Yakima Pesticides/PCBs TMDL: Vol 1, WQ Study Findings 

Page 188 

Mackay, D. and A. Fraser. 2000. Bioaccumulation of Persistent Organic Chemicals: 

Mechanisms and Models. Environmental Pollution 110:375-391. 

Mackay, D., W-Y Shiu, and K-C Ma. 1997. Illustrated Handbook of Physical-Chemical 

Properties and Environmental Fate of Organic Compounds, Volume V: Pesticide Chemicals. 

Lewis Publishers, Boca Raton, NY. 

McKenzie, S. and D. Curtiss. 1989. Surface-water-quality Assessment of the Yakima River 

basin, Washington: A Pilot Study. U.S. Geological Survey Open-File Report 89-60. 

Meadows, J.C., K.R. Echols, J.N. Huckins, F.A. Borsuk, R.F. Carline, and D.E. Tillitt. 1998. 

Estimation of Uptake Rates for PCB Congeners Accumulated by Semipermeable Membrane 

Devices and Brown Trout (Salmo trutta). Environ. Sci. Tech. 32:1847-1852. 

Mischke, T., K. Brunetti, V. Acosta, D. Weater, and M. Brown. 1985. Agricultural Sources of 

DDT Residues in California’s Environment. California Department of Food and Agriculture, 

Sacramento, CA. 

Molenaar, D. 1985. Water in the Lower Yakima River Basin, Washington. Water Supply 

Bulletin 53. Washington State Department of Ecology and U.S. Geological Survey, 

Olympia, WA. 159 pp. 

Morace, J.L., Fuhrer, G.J., Rinella, J.F., S.W. McKenzie, and others. 1999. Surface-waterquality Assessment of the Yakima River Basin in Washington: An Overview of Major Findings, 

1987091. U.S. Geological Survey Water-Resources Investigations Report 98-4113. 

Nelson, L.M. 1979. Sediment Transport by Irrigation Return Flows in the Lower Yakima River 

Basin, Washington, 1975 and 1976 Irrigation Seasons. Open File Report 78-946. U.S. Geological 

Survey, Tacoma, WA. 76 pp. 

NOAA. 2008. Endangered Species Act Section 7 Consultation: Final Biological Opinion, 

Environmental Protection Agency Registration of Pesticides Containing Chlorpyrifos, Diazinon, 

and Malathion. National Oceanic and Atmospheric Administration, National Marine Fisheries 

Service, Silver Springs, MD. 

Parsons, Inc, 2007. Spokane River PCB TMDL Stormwater Loading Analysis Final Technical 

Report. Prepared by Parsons for U.S. Environmental Protection Agency Region 10 and 

Washington State Department of Ecology, Olympia, WA. www.ecy.wa.gov/biblio/0703055.html

Rantalainen, A.L., M.G. Ikonomou, and I.H. Rogers. 1998. Lipid-Containing Semipermeable 

Membrane Devices (SPMDs) as Concentrators of Toxic Chemicals in the Lower Fraser River, 

British Columbia. Chemosphere 37:1119-1138. 

Rinella, J.F., S.W. McKenzie, J.K. Crawford, W.T. Foreman, G.J. Fuhrer, and J.L. Morace. 

1999. Surface-Water-Quality Assessment of the Yakima River Basin, Washington: Distribution 

of Pesticides and Other Organic Compounds in Water, Sediment, and Aquatic Biota, 1987–91: 

U.S. Geological Survey Water-Supply Paper 2354–B, 180 p. 

 
Yakima Pesticides/PCBs TMDL: Vol 1, WQ Study Findings 

Page 189 

Rinella, Joseph F., P.A. Hamilton, and S.W. McKenzie. 1993. Persistence of the DDT Pesticide 

in the Yakima River Basin. U.S. Geological Survey Circular 1090. 

Risebrough, R.W., W.M. Jarman, and W. Walker. 1984. Evidence for Recent Mobilization of 

DDT in California. A report to the State Water Resources Control Board, Sacramento, CA. 

39 pp. 

Ryan, J.W. 1997. Irrigation Water is “Water of the U.S.” Memorandum to Ronald L. Levigne 

from Joseph W. Ryan, Assistant Regional Counsel, U.S. Environmental Protection Agency, 

Seattle, WA. 

Schmitt, C.J., J.L. Zajicek, and P.H. Peterman. 1990. National Contaminant Monitoring 

Program: Residues of Organochlorine Chemicals in U.S. Freshwater Fish, 1976 - 84. Arch. 

Environ. Contam. Toxicol. 19:748-781. 

Serdar, D. 2003. TMDL Technical Assessment of DDT and PCBs in the Lower Okanogan River 

Basin Washington State Department of Ecology, Olympia, WA. Publication No. 03-03-013. 

www.ecy.wa.gov/biblio/0303013.html

Serdar, D., K. Kinney, and P. Hallinan. 2006 (draft). Spokane River PCBs Total Maximum 

Daily Load Water Quality Improvement Report. Washington State Department of Ecology, 

Olympia, Washington. Publication No. 06-03-024. www.ecy.wa.gov/biblio/0603024.html

Shueler, T.R., 1987. Controlling Urban Runoff: A Practical Manual for Planning and Designing 

Urban BMPs. Metropolitan Washington Council of Governments, Washington, DC. Publication 

No. 87703. 

Soil Conservation Service. 1978. Yakima Co-operative River Basin Study, Draft December 

1978. U.S. Department of Agriculture, Soil Conservation Service, and Forest Service, Spokane, 

WA. 

WDOH. 1993. DDT in Bottom Fish from the Yakima River. Washington State Department of 

Health, Office of Toxic Substances, Olympia, WA. 

Zuroske, M. 2004. Conservation Practices and Water Quality Trends in Sulphur Creek 

Wasteway and Granger Drain Watersheds, 1997-2002. South Yakima Conservation District and 

Roza-Sunnyside Board of Joint Control. 

Zuroske, M. 2008. Lower Yakima River Eutrophication Study: Preliminary Highlights. April 

30, 2008 presentation at the Washington State Department of Ecology, Central Regional Office, 

Yakima, WA. 

 
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Appendices 
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Appendix A. Yakima Basin 303(d) Listings Based on Edible 

Fish Tissue Samples (2008 list) 

Water Body Approximate 

Location 

Listing 

ID Parameter 

Upper Yakima River (WRIA* 39)

Keechelus Lake Near inlet 43146 Total PCBs 

Keechelus Lake Near inlet 43128 Dioxin 

Yakima River Umtanum 20182 Chlordane 

Yakima River Umtanum 20219 Total PCBs 

Yakima River Umtanum 34889 Dioxin 

Naches River (WRIA 38)

Cowiche Creek 

Cowiche Creek 

Near mouth 

Near mouth 

17214

52833

4,4'-DDE 

Total PCBs 

Lower Yakima River (WRIA 37)

Yakima River Union Gap 14253 4,4'-DDT 

Yakima River Union Gap 14257 4,4'-DDE 

Yakima River Union Gap 14255 4,4'-DDD 

Yakima River Union Gap 14259 Alpha-BHC 

Yakima River Union Gap 14261 Total PCBs 

Yakima River Zillah 7351 4,4'-DDT 

Yakima River Zillah 8874 4,4'-DDE 

Yakima River Zillah 8875 Dieldrin 

Yakima River Granger 19595 4,4'-DDE 

Yakima River Granger 19597 4,4'-DDE 

Yakima River Granger 19616 4,4'-DDT 

Yakima River Granger 19618 4,4'-DDT 

Yakima River Granger 20047 Total PCBs 

Yakima River 

Yakima River 

Yakima River 

Granger 

Granger 

Granger 

20045

34905 

34913

Total PCBs 

Dioxin 

Dioxin 

Yakima River Grandview 16430 4,4'-DDD 

Yakima River Prosser 19598 4,4'-DDE 

Yakima River Prosser 19619 4,4'-DDT 

Yakima River Prosser 19705 Chlordane 

Yakima River Prosser 34887 Dioxin 

Yakima River Benton City 8897 4,4'-DDT 

Yakima River Benton City 14252 4,4'-DDT 

Yakima River Benton City 19602 4,4'-DDE 

Yakima River Benton City 14256 4,4'-DDE 

Yakima River Benton City 8893 4,4'-DDE 
Yakima Pesticides/PCBs TMDL: Vol 1, WQ Study Findings 

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Water Body Approximate 

Location 

Listing 

ID Parameter 

Yakima River Benton City 14254 4,4'-DDD 

Yakima River Benton City 14258 Alpha-BHC 

Yakima River Benton City 7350 Total PCBs 

Yakima River Horn Rapids 19622 4,4'-DDT 

Yakima River Horn Rapids 19601 4,4'-DDE 

Yakima River Horn Rapids 8861 4,4'-DDE 

Yakima River Horn Rapids 8902 Dieldrin 

Yakima River Horn Rapids 8864 Total PCBs 

Yakima River Horn Rapids 8863 Total PCBs 

Yakima River Near mouth 19614 4,4'-DDT 

Yakima River Near mouth 19592 4,4'-DDE 

*Water Resource Inventory Area. 
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Appendix B. Yakima Basin 303(d) Listings Based on Water 

Samples (2008 list) 

Waterbody Listing 

ID Parameter 

Lower Yakima River (WRIA* 37) 

 Yakima River @ Union Gap 8876 DDT 

 Yakima River @ Union Gap 8877 4,4'-DDE 

 Yakima River, Blue Slough 

 Yakima River, Blue Slough 

 Yakima River, Blue Slough 

 Yakima River, Blue Slough 

 Yakima River, Blue Slough 

7377 

7376 

7378 

7380 

7383 

4,4'-DDD 

4,4’-DDE 

Chlorpyrifos 

DDT 

Endosulfan 

 Yakima River bw. Granger 8854 Dieldrin 

 Yakima River bw. Granger 8873 DDT 

 Yakima River nr. Grandview 8889 4,4'-DDD 

 Yakima River nr. Grandview 8891 4,4'-DDE 

 Yakima River bw. Spring Cr. 8896 DDT 

 Yakima River @ Kiona 8860 DDT 

 Yakima River @ Kiona 8862 4,4'-DDD 

 Yakima River @ Kiona 8865 Endosulfan 

 Yakima River @ Kiona 8871 Dieldrin 

 Yakima River @ Kiona 8890 4,4'-DDE 

 Yakima River bw. Kiona 12868 4,4’-DDE 

 Wide Hollow Creek 8849 4,4'-DDD 

 Wide Hollow Creek 8848 4,4'-DDE 

 Wide Hollow Creek 8855 DDT 

 Wide Hollow Creek 8856 Dieldrin 

 Wide Hollow Creek 8857 Endosulfan 

 Marion Drain 52838 Chlorpyrifos 

 Moxee (Birchfield) Drain 7373 DDT 

 Moxee (Birchfield) Drain 7374 Dieldrin 

 Moxee (Birchfield) Drain 7375 Endosulfan 

 Granger Drain 7362 4,4'-DDD 

 Granger Drain 7361 4,4'-DDE 

 Granger Drain 7360 DDT 

 Granger Drain 7363 Dieldrin 

 Granger Drain 7364 Endosulfan 

 Sulphur Creek Wasteway 8906 4,4'-DDD 

 Sulphur Creek Wasteway 7385 4,4'-DDE 

 Sulphur Creek Wasteway 8909 DDT 
Yakima Pesticides/PCBs TMDL: Vol 1, WQ Study Findings 

Page 196 

Waterbody Listing 

ID Parameter 

 Sulphur Creek Wasteway 7384 DDT 

 Sulphur Creek Wasteway 8911 Dieldrin 

 Sulphur Creek Wasteway 

 Sulphur Creek Wasteway 

8908

52842

Endosulfan 

Chlorpyrifos 

 Snipes Creek 7369 4,4'-DDD 

 Snipes Creek 7367 4,4'-DDD 

 Snipes Creek 7370 4,4'-DDE 

 Snipes Creek 7366 4,4'-DDE 

 Snipes Creek 7365 DDT 

 Spring Creek 7355 4,4'-DDD 

 Spring Creek 7357 4,4'-DDD 

 Spring Creek 7354 4,4'-DDE 

 Spring Creek 7358 4,4'-DDE 

 Spring Creek 

 Spring Creek 

7353

52841

DDT 

Chlorpyrifos 

*Water Resource Inventory Area. 
Yakima Pesticides/PCBs TMDL: Vol 1, WQ Study Findings 

Page 197 

Appendix C. Use Designations for WRIA 37- Lower Yakima 

River, WRIA 38-Naches River, and WRIA 39-Upper Yakima 

River 

(www.ecy.wa.gov/programs/wq/swqs/reference_files/table-602.pdf.)

 
Yakima Pesticides/PCBs TMDL: Vol 1, WQ Study Findings 

Page 198 

This page is purposely left blank 

 
 TABLE 602 Aquatic Life Uses Recreation Uses Water Sup

Uses 

 Use Designations for Fresh Waters by Water Resource Inventory Area (WRIA) 

Char Spawning /Rearing 

Core Summer Habitat 

Spawning/Rearing 

Rearing/Migration Only 

Redband Trout 

Industrial Water 

Agricultural Water 

Warm Water Species 

Ex Primary Cont 

Secondary Cont 

Domestic Water 

Primary Cont 

 1. Temperature shall not exceed a 1-DMax of 20.0°C due to human activities. When natural conditions exceed a 1-DMax of 20.0increase will be allowed which will raise the receiving water temperature by greater than 0.3°C; nor shall such temperature increases= 34/(T + 9).  2. The following two notes apply:  (a) Below Clearwater River (river mile 139.3). Temperature shall not exceed a 1-DMax of 20.0°C due to human activities. When exceed a 1-DMax of 20.0°C, no temperature increase will be allowed which will raise the receiving water temperature by greater tha

temperature increases, at any time, exceed t = 34/(T + 9). Special condition - special fish passage exemption as described in WAC 1

 (b) Above Clearwater River (river mile 139.3). Temperature shall not exceed a 1-DMax of 20.0°C due to human activities. When 

exceed a 1-DMax of 20.0°C, no temperature increases will be allowed which will raise the receiving water temperature by greater thsuch temperature increases, at any time, exceed 0.3°C due to any single source or 1.1°C due to all such activities combined. 

WRIA 36 Esquatzel Coulee There are no specific waterbody entries for this WRIA WRIA 37 Lower Yakima Ahtanum Creek North Fork's unnamed tributaries at latitude 46.5465 longitude -120.8857 

3 3 3 3 3 

Ahtanum Creek North Fork's unnamed tributaries at latitude 46.5395 longitude -120.9851 

3 3 3 3 3 

Ahtanum Creek, between junction with South Fork and junction of North and Middle Forks (including tributaries) except where designated Char. 

3 3 3 3 3 

Ahtanum Creek, North Fork, and Middle Fork Ahtanum Creek: All waters (including tributaries) above the junction. 

3 3 3 3 3 

Ahtanum Creek, South Fork, and all tributaries 3 3 3 3 3 Carpenter Gulch and all tributaries 3 3 3 3 3 

Page 199 
 TABLE 602 Aquatic Life Uses Recreation Uses Water Sup

Uses 

 Use Designations for Fresh Waters by Water Resource Inventory Area (WRIA) 

Char Spawning /Rearing 

Core Summer Habitat 

Spawning/Rearing 

Rearing/Migration Only 

Redband Trout 

Warm Water Species 

Ex Primary Cont 

Secondary Cont 

Domestic Water 

Primary Cont 

Industrial Water 

Agricultural Water 

Foundation Creek and all tributaries 3 3 3 3 3 Nasty Creek and all tributaries 3 3 3 3 3 Sulphur Creek 3 3 3 3 Yakima River from mouth to Cle Elum River (river mile 185.6) except where specifically designated otherwise in Table 602.1 3 3 3 3 3 Notes for WRIA 37:  1. Temperature shall not exceed a 1-DMax of 21.0°C due to human activities. When natural conditions exceed a 1-DMax of 21.0increase will be allowed which will raise the receiving water temperature by greater than 0.3°C; nor shall such temperature increases= 34/(T + 9). WRIA 38 Naches American River and all tributaries 3 3 3 3 3 Barton Creek and all tributaries 3 3 3 3 3 Bumping Lake's unnamed tributaries at latitude 46.8850 longitude -121.2779 3 3 3 3 3 Bumping River's unnamed tributaries at latitude 46.9317 longitude -121.2067(outlet of Flat Iron Lake). 

3 3 3 3 3 

Bumping River and tributaries downstream of the upper end of Bumping Lake (except where designated Char) 

3 3 3 3 3 

Bumping River (and tributaries) upstream of Bumping Lake. 3 3 3 3 3 Cedar Creek and all tributaries 3 3 3 3 3 Clear Creek and tributaries (including Clear Lake) 3 3 3 3 3 Crow Creek and all tributaries 3 3 3 3 3 Deep Creek and all tributaries 3 3 3 3 3 

Page 200
 TABLE 602 Aquatic Life Uses Recreation Uses Water Sup

Uses 

 Use Designations for Fresh Waters by Water Resource Inventory Area (WRIA) 

Char Spawning /Rearing 

Core Summer Habitat 

Spawning/Rearing 

Rearing/Migration Only 

Redband Trout 

Warm Water Species 

Ex Primary Cont 

Primary Cont 

Secondary Cont 

Domestic Water 

Industrial Water 

Agricultural Water 

Goat Creek and all tributaries 3 3 3 3 3 Granite Creek and all tributaries 3 3 3 3 3 Indian Creek and all tributaries 3 3 3 3 3 Little Naches River and Bear Creek: All waters (including tributaries) above the junction 

3 3 3 3 3 

Little Naches River, South Fork and all tributaries 3 3 3 3 3 Naches River and tributaries from latitude 46.7640 longitude -120.8286 (just upstream of Cougar Canyon) to Snoqualmie National Forest boundary (river mile 35.7) (except where designated Char). 

3 3 3 3 3 

Naches River from Snoqualmie National Forest boundary (river mile 35.7) to headwaters (except where designated Char). 

3 3 3 3 3 

Pileup Creek and all tributaries 3 3 3 3 3 Quartz Creek and all tributaries 3 3 3 3 3 Rattlesnake Creek: All waters above the junction with North Fork Rattlesnake Creek 

3 3 3 3 3 

Rattlesnake Creek, North Fork, all waters above latitude 46.8107 longitude 121.0694 (from and including the unnamed tributary just above junction with mainstem). 

3 3 3 3 3 

Sand Creek and all tributaries 3 3 3 3 3 Sunrise Creek (latitude 46.9042 longitude -121.2431) and all tributaries. 3 3 3 3 3 Tieton River and tributaries (except where otherwise designated). 3 3 3 3 3 Tieton River, North Fork (including tributaries) above the junction at Clear Lake 3 3 3 3 3 

Page 201
 TABLE 602 Aquatic Life Uses Recreation Uses Water Sup

Uses 

 Use Designations for Fresh Waters by Water Resource Inventory Area (WRIA) 

Char Spawning /Rearing 

Core Summer Habitat 

Spawning/Rearing 

Rearing/Migration Only 

Redband Trout 

Warm Water Species 

Ex Primary Cont 

Primary Cont 

Secondary Cont 

Domestic Water 

Industrial Water 

Agricultural Water 

Tieton River, South Fork, and all tributaries 3 3 3 3 3 WRIA 39 Upper Yakima Cle Elum River from mouth to latitude 47.3805 longitude -121.0983 (above Little Salmon la Sac Creek) 

3 3 3 3 3 

Cle Elum River and all tributaries from junction with unnamed tributary at and latitude 47.3805 longitude -121.0983 to headwaters. 

3 3 3 3 3 

Indian Creek and tributaries downstream of Wenatchee National Forest boundary below 

3 3 3 3 3 

Indian Creek and tributaries in or above national forest boundary 3 3 3 3 3 Jack Creek and tributaries downstream of Wenatchee National Forest boundary below 

3 3 3 3 3 

Jack Creek and tributaries in or above national forest boundary 3 3 3 3 3 Little Kachess Lake (narrowest point dividing Kachess Lake from Little Kachess Lake) and all tributaries 

3 3 3 3 3 

Manastash Creek: All waters above the Junction of the North and South Forks that are downstream of the Wenatchee National Forest boundary. 

3 3 3 3 3 

Manastash Creek: All waters above the Junction of the North and South Forks that are in or above the Wenatchee National Forest. 

3 3 3 3 3 

Manastash Creek mainstem from mouth to junction of North and South Forks 3 3 3 3 3 Manastash Creek, tributaries to mainstem, between the mouth and the junction of North and South Forks 

3 3 3 3 3 

Swauk Creek mainstem from mouth to junction with First Creek 3 3 3 3 3 

Page 202
 TABLE 602 Aquatic Life Uses Recreation Uses Water Sup

Uses 

 Use Designations for Fresh Waters by Water Resource Inventory Area (WRIA) 

Char Spawning /Rearing 

Core Summer Habitat 

Spawning/Rearing 

Rearing/Migration Only 

Redband Trout 

Warm Water Species 

Ex Primary Cont 

Primary Cont 

Secondary Cont 

Domestic Water 

Industrial Water 

Agricultural Water 

Swauk Creek from junction with First Creek to Wenatchee National Forest (including tributaries) 

3 3 3 3 3 

Taneum Creek, tributaries to mainstem, from mouth to Wenatchee National Forest boundary 

3 3 3 3 3 

Taneum Creek mainstem from mouth to Wenatchee National Forest boundary 3 3 3 3 3 Teanaway River mainstem from mouth to West Fork Teanaway River 3 3 3 3 3 Teanaway River, tributaries to mainstem, from mouth to West Fork Teanaway River 

3 3 3 3 3 

Teanaway River, West Fork, and tributaries downstream of the Wenatchee National Forest 

3 3 3 3 3 

Teanaway River, West Fork, and tributaries upstream of the Wenatchee National Forest 

3 3 3 3 3 

Teanaway River, North Fork, and tributaries from junction with West Fork to Jungle Creek that are downstream of the Wenatchee National Forest boundary (except where designated otherwise). 

3 3 3 3 3 

Teanaway River, North Fork, and tributaries from junction with West Fork to Jungle Creek that are in or above the Wenatchee National Forest boundary (except where designated otherwise). 

3 3 3 3 3 

Teanaway River, North Fork, and all tributaries above and including Jungle Creek 3 3 3 3 3 Yakima River mainstem from mouth to Cle Elum River (river mile 185.6) except where specifically designated otherwise in Table 602.1 3 3 3 3 3 Yakima River and tributaries from Cle Elum River (river mile 185.6) to headwaters (except where designated otherwise). 

3 3 3 3 3 

Page 203
 TABLE 602 Aquatic Life Uses Recreation Uses Water Sup

Uses 

 Use Designations for Fresh Waters by Water Resource Inventory Area (WRIA) 

Char Spawning /Rearing 

Core Summer Habitat 

Spawning/Rearing 

Rearing/Migration Only 

Redband Trout 

Warm Water Species 

Ex Primary Cont 

Primary Cont 

Secondary Cont 

Domestic Water 

Industrial Water 

Agricultural Water 

Yakima River and tributaries above the unnamed tributary (latitude 47.2927 longitude -121.2971) entering the Yakima River in Sect.25 T21NR12E. 

3 3 3 3 3 

Notes for WRIA 39:  1. Temperature shall not exceed a 1-DMax of 21.0°C due to human activities. When natural conditions exceed a 1-DMax of 21.0increase will be allowed which will raise the receiving water temperature by greater than 0.3°C; nor shall such temperature increases= 34/(T + 9). WRIA 40 Alkaki-Squilchuck There are no specific waterbody entries for this WRIA WRIA 41 Lower Crab Crab Creek and tributaries 3 3 3 3 WRIA 42 Grand Coulee Crab Creek and tributaries 3 3 3 3 WRIA 43 Upper Crab-Wilson Crab Creek and tributaries 3 3 3 3 WRIA 44 Moses Coulee There are no specific waterbody entries for this WRIA WRIA 45 Wenatchee Chiwaukum Creek from junction with Skinney Creek to headwaters (including tributaries) 

3 3 3 3 3 

Chiwawa River from mouth to Chickamin Creek (including tributaries) 3 3 3 3 3 Chiwawa River (and all tributaries) above and including Chickamin Creek 3 3 3 3 3 

Page 204
Yakima Pesticides/PCBs TMDL: Vol 1, WQ Study Findings 

Page 205 

Appendix D. 2006 Fish Tissue Data 
Yakima Pesticides/PCBs TMDL: Vol 1, WQ Study Findings 

Page 206 

Table D-1. Chlorinated Pesticide Concentrations in Yakima River Fish Fillet Samples, 2006 (ug/Kg, wet weight; parts per 

Reach Sample No. Species

Lipids (%)

Keechelus Lake 6394088 LSS 2.08 0.37 U 2.8 0.5 3.3 0.37 U 0.83 UJ 0.37 U 0.37 U 0.37 U 0.37 U 0.37 UJ 0.37 U 0.37 U 0.37 UJ 

Keechelus Lake 6394089 LSS 1.56 0.38 U 2.4 0.4 2.8 0.38 U 0.74 UJ 0.38 U 0.38 U 0.38 U 0.38 U 0.38 UJ 0.38 U 0.38 U 0.38 UJ 

Keechelus Lake 6394090 LSS 1.6 0.38 U 1.3 0.38 U 1.3 0.38 U 0.38 U 0.38 U 0.38 U 0.38 U 0.38 U 0.38 UJ 0.38 U 0.38 U 0.38 UJ 

Keechelus Lake 6394092 NPM 1.13 0.4 U 1.8 0.4 U 1.8 0.4 U 0.88 UJ 0.4 U 0.4 U 0.4 U 0.4 U 0.4 UJ 0.4 U 0.4 U 0.4 UJ 

Keechelus Lake 6394093 NPM 1.09 0.37 U 3.3 0.37 U 3.3 0.37 U 1.1 UJ 0.37 U 0.37 U 0.37 U 0.37 U 0.37 UJ 0.37 U 0.37 U 0.37 UJ 

Keechelus Lake 6394095 KOK 2.54 0.41 2.4 0.83 3.6 0.37 U 0.49 UJ 0.37 U 0.37 U 0.72 0.72 0.37 UJ 0.37 U 0.37 U 0.37 UJ 

Keechelus Lake 6394096 KOK 2.78 0.4 U 2 0.79 2.8 0.4 U 0.42 UJ 0.4 U 0.4 U 0.6 0.6 0.4 UJ 0.4 U 0.4 U 0.4 UJ 

Keechelus Lake 6394097 KOK 3.33 0.47 2.1 0.87 3.4 0.39 U 0.5 UJ 0.39 U 0.39 U 0.78 0.78 0.39 UJ 0.39 U 0.39 U 0.39 UJ 

Keechelus Lake 6394099 CTT 1.86 0.39 U 0.77 0.28 J 1.1 J 0.39 U 0.23 J 0.39 U 0.39 U 0.39 U 0.23 J 0.39 U 0.39 U 0.39 U 0.39 UJ Keechelus Lake 6394100 CTT 1.36 0.39 U 0.61 0.39 U 0.6 0.39 U 0.39 U 0.39 U 0.39 U 0.39 U 0.39 U 0.39 U 0.39 U 0.39 U 0.39 UJ Keechelus Lake 6394101 CTT 1.09 0.39 U 0.44 0.39 U 0.4 0.39 U 0.39 U 0.39 U 0.39 U 0.39 U 0.39 U 0.39 U 0.39 U 0.39 U 0.39 UJ Keechelus Lake 6394103 MWF 2.55 0.39 U 0.59 0.39 U 0.6 0.39 U 0.39 U 0.39 U 0.39 U 0.39 U 0.39 U 0.39 UJ 0.39 U 0.39 U 0.39 UJ Keechelus Lake 6394104 MWF 2.96 0.39 U 0.87 0.39 U 0.9 0.39 U 0.39 U 0.39 U 0.39 U 0.39 U 0.39 U 0.39 UJ 0.39 U 0.39 U 0.39 UJ Kachess Lake 6394080 LSS 0.69 0.4 U 0.76 0.4 U 0.76 0.4 U 0.4 U 0.4 U 0.4 U 0.4 U 0.4 U 0.4 U 0.4 U 0.4 U 0.4 UJ Kachess Lake 6394081 LSS 0.48 0.4 U 0.87 0.4 U 0.87 0.4 U 0.4 U 0.4 U 0.4 U 0.4 U 0.4 U 0.4 U 0.4 U 0.4 U 0.4 UJ Kachess Lake 6394082 LSS 0.55 0.39 U 0.86 0.39

U 0.86 0.39 U 0.39 U 0.39 U 0.39 U 0.39 U 0.39 U 0.39 UJ 0.39 U 0.39 U 0.39 UJ 

Kachess Lake 6394084 NPM 0.58 0.4 U 2.7 0.4 U 2.7 0.4 U 0.57 UJ 0.4 U 0.4 U 0.4 U 0.4 U 0.4 U 0.4 U 0.4 U 0.4 UJ 

Kachess Lake 6394085 NPM 0.86 0.37 U 4.2 0.37 U 4.2 0.37 U 0.92 UJ 0.37 U 0.37 U 0.63 0.63 0.37 U 0.37 U 0.37 U 0.37 UJ 

Kachess Lake 6394086 NPM 0.6 0.39 U 4.2 0.39 U 4.2 0.39 U 0.98 UJ 0.39 U 0.39 U 0.39 U 0.39 U 0.39 U 0.39 U 0.39 U 0.39 UJ 

Cle Elum 6414068 MWF 4.24 0.27 J 6.6 0.8 8 J 0.39 U 0.56 0.39 U 0.39 U 0.37 J 0.93 J 0.39 UJ 0.39 U 0.39 U 0.39 UJ 

Cle Elum 6414069 MWF 5.09 0.54 5.7 3.1 9 0.32 J 0.96 0.21 J 0.39 U 1.6 3.09 J 0.39 UJ 0.39 U 0.39 U 0.39 UJ Cle Elum 6414070 MWF 4.42 0.49 18 2 20 0.21 J 0.74 0.4 U 0.4 U 1.1 2.05 J 0.4 UJ 0.4 U 0.4 U 0.4 UJ 

Cle Elum 6414072 BLS 4.03 0.45 9.1 1.4 11 0.38 U 0.38 0.38 U 0.38 U 0.28 0.66 0.38 UJ 0.38 U 0.38 U 0.38 UJ 

Cle Elum 6414073 BLS 2.8 0.3 J 5.1 0.77 6 J 0.39 U 0.28 J 0.39 U 0.39 U 0.29 J 0.57 J 0.39 U 0.39 U 0.39 U 0.39 UJ 

Cle Elum 6414074 BLS 2.51 0.81 9.4 1.2 11 0.4 U 0.4 U 0.4 U 0.4 U 0.4 U 0.4 U 0.4 UJ 0.4 U 0.4 U 0.4 U 

Cle Elum 6414076 NPM 1.98 0.71 12 0.39 U 13 0.39 U 0.41 UJ 0.39 U 0.39 U 0.57 0.57 0.39 UJ 0.39 U 0.39 U 0.39 U 

Cle Elum 6414077 NPM 1.73 0.43 12 0.38 U 12 0.38 U 0.38 U 0.38 U 0.38 U 0.53 0.53 0.38 UJ 0.38 U 0.38 U 0.38 U 

Cle Elum 6414078 NPM 1.27 0.62 8.8 0.39 U 9 0.39 U 0.39 U 0.39 U 0.39 U 0.61 0.61 0.39 UJ 0.39 U 0.39 U 0.39 U 

Yakima Canyon 6414050 MWF 4.51 1.2 41 3.9 46 0.4 0.95 0.4 U 0.4 U 1.5 2.85 0.4 UJ 0.4 U 0.4 U 0.4 UJ Yakima Canyon 6414051 MWF 5.43 0.7 23 2 26 0.39 U 0.84 0.39 U 0.39 U 0.87 1.71 0.39 UJ 0.39 U 0.39 U 0.39 UJ 

Yakima Canyon 6414052 MWF 4.67 1.1 40 3.7 45 0.53 1.1 0.22 J 0.21 J 2.1 4.16 0.4 J 0.4 U 0.4 U 0.4 UJ Yakima Canyon 6414057 NPM 2.87 1.4 45 1.4 48 0.27 J 1.5 0.4 U 0.4 U 1.7 3.47 J 0.4 U 0.4 U 0.4 U 0.4 UJ Yakima Canyon 6414058 NPM 2.04 1.1 34 0.36 J 35 J 0.21 J 0.79 0.38 U 0.38 U 1.4 2.4 J 0.38 U 0.38 U 0.38 U 0.38 UJ 

Yakima Canyon 6414059 NPM 1.76 0.56 15 0.2 J 16 J 0.39 U 0.53 0.39 U 0.39 U 0.9 1.43 0.39 U 0.39 U 0.39 U 0.39 UJ 

Yakima Canyon 6414061 BLS 4.72 1.3 26 3.9 31 0.58 0.77 0.21 J 0.2 J 1.3 3.06 0.38 U 0.38 U 0.38 U 0.38 UJ 

Yakima Canyon 6414062 BLS 2.16 0.52 5.1 0.97 7 0.37 U 0.37 U 0.37 U 0.37 U 0.37 U 0.37 U 0.37 U 0.37 U 0.37 U 0.37 UJ 

Yakima Canyon 6414063 BLS 2.93 0.34 J 5.1 0.84 6 J 0.4 U 0.4 U 0.4 U 0.4 U 0.34 J 0.34 J 0.4 U 0.4 U 0.4 U 0.4 UJ 

Wapato-Toppenish 6484230 LSS 3.33 3.8 55 4.9 64 0.39 U 0.43 UJ 0.39 U 0.39 U 0.53 0.53 1.6 U 0.39 U 0.39 U 0.39 U 

Wapato-Toppenish 6484231 LSS 2.92 5.1 61 4 70 0.39 U 0.49 UJ 0.39 U 0.39 U 0.66 0.66 0.77 UJ 0.39 U 0.39 U 0.39 U 

Wapato-Toppenish 6484232 LSS 3.25 8.2 71 4.9 84 0.4 U 0.51 UJ 0.4 U 0.4 U 0.61 0.61 1.6 U 0.4 U 0.4 U 0.4 U 

Wapato-Toppenish 6484234 NPM 1.06 3 53 0.4 U 56 0.4 U 0.63 UJ 0.4 U 0.4 U 0.61 0.61 0.4 U 0.4 U 0.4 U 0.4 U 

Wapato-Toppenish 6484235 NPM 1.1 4.2 130 0.48 135 0.4 U 0.4 U 0.4 U 0.4 U 0.42 0.42 0.4 U 0.4 U 0.4 U 0.4 U 

Wapato-Toppenish 6484236 NPM 1.35 8.2 160 0.4 U 168 0.4 U 1.7 UJ 0.4 U 0.4 U 1.2 1.2 0.4 U 0.4 U 0.4 U 0.4 U 

Wapato-Toppenish 6484238 MWF 3.15 8.5 110 7.9 126 0.71 1 UJ 0.39 U 0.39 U 1.9 2.61 1.6 U 0.39 U 0.39 U 0.39 U 

Wapato-Toppenish 6484239 MWF 2.9 7.4 110 7.1 125 0.59 1.1 UJ 0.38 U 0.38 U 1.7 2.29 0.77 UJ 0.38 U 0.38 U 0.38 U 

Wapato-Toppenish 6484240 MWF 3.02 5.6 80 6 92 0.4 U 0.79 UJ 0.4 U 0.4 U 1 1 1.6 U 0.4 U 0.4 U 0.4 U 

4,4'-DDD

4,4'-DDE

4,4'-DDT

Total DDT

Cis-Chlordane

Cis-Nonachlor

Oxychlordane

TransChlordane

TransNonachlor

Total 

Chlordane

Methoxychlor

Alpha-BHC

Beta-BHC

Delta-BHC
Yakima Pesticides/PCBs TMDL: Vol 1, WQ Study Findings 

Page 207 

Table D-1 continued. 

Reach Sample No. Species

Lipids (%)

Prosser 6454105 CRP 4.31 25 380 3.4 408 1 4.1 0.27 J 0.4 2.7 8.47 J 0.39 UJ 0.39 U 0.39 U 0.39 U Prosser 6454106 CRP 7.14 38 750 7 795 1.7 7.8 0.55 0.75 5 15.8 0.39 UJ 0.39 U 0.39 U 0.39 U 

Prosser 6454107 CRP 3.71 21 360 2.6 384 1.2 6 0.31 J 0.58 3.7 11.8 J 0.39 UJ 0.39 U 0.39 U 0.39 U 

Prosser 6444234 SMB 0.62 2.5 32 0.93 35 0.39 U 0.39 U 0.39 U 0.39 U 0.39 U 0.39 U 0.39 U 0.39 U 0.39 U 0.39 U 

Prosser 6444235 SMB 0.66 3.3 43 2.3 49 0.38 U 0.38 U 0.38 U 0.38 U 0.38 U 0.38 U 0.38 U 0.38 U 0.38 U 0.38 U 

Prosser 6444236 SMB 0.3 3 17 0.46 20 0.4 U 0.4 U 0.4 U 0.4 U 0.4 U 0.4 U 0.4 U 0.4 U 0.4 U 0.4 U 

Prosser 6444238 LSS 1.77 11 99 4.8 115 0.39 U 0.77 UJ 0.39 U 0.39 U 0.73 0.73 0.39 UJ 0.39 U 0.39 U 0.39 U 

Prosser 6444239 LSS 2.01 10 100 3.7 114 0.39 U 0.73 UJ 0.39 U 0.39 U 0.71 0.71 0.39 UJ 0.39 U 0.39 U 0.39 U 

Prosser 6444240 LSS 2.41 21 100 4.3 125 0.39 U 1.4 UJ 0.39 U 0.39 U 0.61 0.61 0.39 UJ 0.39 U 0.39 U 0.39 U 

Horn Rapids 6444230 CRP 7.94 41 990 7 1038 1.6 11 UJ 0.64 0.4 U 5.8 8.04 1.6 UJ 0.4 U 0.4 U 0.4 U 

Horn Rapids 6444231 CRP 9.17 25 500 4.3 529 1.1 7.2 UJ 0.57 0.39 U 3.9 5.57 1.6 UJ 0.39 U 0.39 U 0.39 U 

Horn Rapids 6444232 CRP 5.83 17 380 4.2 J 401 J 0.39 U 3.9 UJ 0.39 U 0.39 U 1.9 1.9 0.79 UJ 0.39 U 0.39 U 0.39 U Horn Rapids 6444242 NPM 1.08 5.2 65 0.38 U 70 0.38 U 0.96 UJ 0.38 U 0.38 U 0.73 0.73 0.38 UJ 0.38 U 0.38 U 0.38 U 

Horn Rapids 6444243 NPM 1.41 4.8 60 0.39 U 65 0.39 U 0.89 UJ 0.39 U 0.39 U 0.51 0.51 0.39 UJ 0.39 U 0.39 U 0.39 U 

Horn Rapids 6444244 NPM 1.3 6.7 110 0.41 117 0.4 U 0.58 UJ 0.4 U 0.4 U 0.45 0.45 0.4 UJ 0.4 U 0.4 U 0.4 U 

Horn Rapids 6454108 SMB 1.37 3.8 78 1.3 83 0.39 U 0.66 0.39

U 0.39 U 0.46 1.12 0.39 UJ 0.39 U 0.39 U 0.54 

Horn Rapids 6454109 SMB 1.01 3.3 59 0.89 63 0.38 U 0.57 0.38 U 0.38 U 0.62 1.19 0.38 UJ 0.38 U 0.38 U 0.38 

Horn Rapids 6454110 SMB 0.95 1.9 37 1.1 40 0.39 U 0.36 J 0.39 U 0.39 U 0.31 J 0.67 J 0.39 UJ 0.39 U 0.39 U 0.48 

Horn Rapids 6454111 LSS 2.79 5.3 57 2.4 65 0.22 J 0.62 0.4 U 0.4 U 0.54 1.38 J 0.4 UJ 0.4 U 0.4 U 0.4 U 

Horn Rapids 6454112 LSS 4.65 6.2 79 3.1 88 0.3 J 0.87 0.2 J 0.4 U 0.76 2.13 J 0.4 UJ 0.4 U 0.4 U 0.4 J 

Horn Rapids 6454113 LSS 3.56 7.7 110 5.8 124 0.39 U 1.2 0.39 U 0.39 U 0.8 2 0.39 UJ 0.39 U 0.39 U 0.53 

(--) Not analyzed forU = The analyte was not detected at or above the reported result.J = The analyte was positively identified. The associated numerical result is an estimate.UJ = The analyte was not detected at or above the reported estimated result.NJ = There is evidence that the analyte is present. The associated numerical result is an estimate.BLS = bridgelip sucker LSS = largescale suckerCRP = common carp MWF = mountain whitefishCTT = cutthroat trout NPM = northern pikeminnowKOK = kokanee SMB = smallmouth bass

4,4'-DDD

4,4'-DDE

4,4'-DDT

Total DDT

Cis-Chlordane

Cis-Nonachlor

Oxychlordane

TransChlordane

TransNonachlor

Total 

Chlordane

Methoxychlor

Alpha-BHC

Beta-BHC

Delta-BHC
Yakima Pesticides/PCBs TMDL: Vol 1, WQ Study Findings 

Page 208 

Table D-1 continued. 

Reach Sample No. Species

Keechelus Lake 6394088 LSS 0.37 U 0.37 U 0.37 U 0.37 U 0.37 U 0.37 U 0.37 U 0.37 UJ --

Keechelus Lake 6394089 LSS 0.38 U 0.38 U 0.38 U 0.38 U 0.38 U 0.38 U 0.38 U 0.38 UJ --

Keechelus Lake 6394090 LSS 0.38 U 0.38 U 0.38 U 0.38 U 0.38 U 0.38 U 0.38 U 0.38 UJ --

Keechelus Lake 6394092 NPM 0.4 U 0.4 U 0.4 U 0.4 U 0.4 U 0.4 U 0.4 U 0.4 UJ --

Keechelus Lake 6394093 NPM 0.37 U 0.37 U 0.37 U 0.37 U 0.37 U 0.37 U 0.37 U 0.37 UJ --

Keechelus Lake 6394095 KOK 0.37 U 0.37 U 0.37 U 0.37 U 0.55 0.37 U 0.37 U 0.37 UJ --

Keechelus Lake 6394096 KOK 0.4 UJ 0.4 UJ 0.4 U 0.4 UJ 0.5 0.4 UJ 0.4 UJ 0.4 UJ --

Keechelus Lake 6394097 KOK 0.39 U 0.39 U 0.39 U 0.39 U 0.59 0.39 U 0.39 U 0.39 UJ --

Keechelus Lake 6394099 CTT 0.39 U 0.39 U 0.39 U 0.39 U 0.39 U 0.39 U 0.39 U 0.39 U 2 U

Keechelus Lake 6394100 CTT 0.39 U 0.39 U 0.39 U 0.39 U 0.39 U 0.39 U 0.39 U 0.39 U 2 U

Keechelus Lake 6394101 CTT 0.39 U 0.39 U 0.39 U 0.39 U 0.39 U 0.39 U 0.39 U 0.39 U 2 U

Keechelus Lake 6394103 MWF 0.39 U 0.39 U 0.39 U 0.39 U 0.39 U 0.39 U 0.39 U 0.39 UJ --

Keechelus Lake 6394104 MWF 0.39 U 0.39 U 0.39 U 0.39 U 0.39 U 0.39 U 0.39 U 0.39 UJ --

Kachess Lake 6394080 LSS 0.4 U 0.4 U 0.4 U 0.4 U 0.4 U 0.4 U 0.4 U 0.4 UJ --

Kachess Lake 6394081 LSS 0.4 U 0.4 U 0.4 U 0.4 U 0.4 U 0.4 U 0.4 U 0.4 UJ --

Kachess Lake 6394082 LSS 0.39 UJ 0.39 U 0.39 U 0.39 U 0.39 U 0.39 UJ 0.39 UJ 0.39 UJ --

Kachess Lake 6394084 NPM 0.4 U 0.4 U 0.4 U 0.4 U 0.4 U 0.4 U 0.4 U 0.4 UJ --

Kachess Lake 6394085 NPM 0.37 U 0.37 U 0.37 U 0.37 U 0.37 U 0.37 U 0.37 U 0.37 UJ --

Kachess Lake 6394086 NPM 0.39 U 0.39 U 0.39 U 0.39 U 0.39 U 0.39 U 0.39 U 0.39 UJ --

Cle Elum 6414068 MWF 0.39 UJ 0.39 UJ 0.39 U 0.39 UJ 0.25 J 0.39 UJ 0.39 UJ 0.39 UJ 1.9 U

Cle Elum 6414069 MWF 0.39 UJ 0.39 UJ 0.39 U 0.39 UJ 0.51 0.39 UJ 0.39 UJ 0.39 UJ 1.9 U

Cle Elum 6414070 MWF 0.4 UJ 0.4 UJ 0.4 U 0.4 UJ 0.45 0.4 UJ 0.4 UJ 0.4 UJ 2 U

Cle Elum 6414072 BLS 0.38 UJ 0.38 UJ 0.38 U 0.38 UJ 0.24 J 0.38 UJ 0.38 UJ 0.38 UJ 1.9 UJ

Cle Elum 6414073 BLS 0.39 U 0.39 U 0.39 U 0.39 U 0.24 J 0.39 U 0.39 U 0.39 U 2 U

Cle Elum 6414074 BLS 0.4 UJ 0.4 UJ 0.4 U 0.4 UJ 0.4 U 0.4 UJ 0.4 UJ 0.4 UJ 4.9 U

Cle Elum 6414076 NPM 0.39 UJ 0.39 UJ 0.39 U 0.39 UJ 0.39 U 0.39 UJ 0.39 UJ 0.39 UJ 4.9 U

Cle Elum 6414077 NPM 0.38 UJ 0.38 UJ 0.38 U 0.38 UJ 0.38 U 0.38 UJ 0.38 UJ 0.38 UJ 0.38 U

Cle Elum 6414078 NPM 0.39 UJ 0.39 UJ 0.39 U 0.39 UJ 0.39 U 0.39 UJ 0.39 UJ 0.39 UJ 4.9 U

Yakima Canyon 6414050 MWF 0.4 UJ 0.4 UJ 0.4 U 0.4 UJ 0.26 J 0.4 UJ 0.4 UJ 0.4 UJ 2 U

Yakima Canyon 6414051 MWF 0.39 UJ 0.39 UJ 0.39 U 0.39 UJ 0.46 0.39 UJ 0.39 UJ 0.39 UJ 2 U

Yakima Canyon 6414052 MWF 0.4 UJ 0.4 UJ 0.4 U 0.4 U 0.53 0.4 U 0.4 U 0.4 U 2 U

Yakima Canyon 6414057 NPM 0.4 UJ 0.4 U 0.4 U 0.4 U 0.28 J 0.4 U 0.4 U 0.4 U 2 U

Yakima Canyon 6414058 NPM 0.38 UJ 0.38 U 0.38 U 0.38 U 0.23 J 0.38 U 0.38 U 0.38 U 1.9 U

Yakima Canyon 6414059 NPM 0.39 U 0.39 U 0.39 U 0.39 U 0.39 U 0.39 U 0.39 U 0.39 U 6.5 NJ

Yakima Canyon 6414061 BLS 0.38 U 0.38 U 0.38 U 0.38 U 0.47 0.38 U 0.38 U 0.38 U 50 NJ

Yakima Canyon 6414062 BLS 0.37 U 0.37 U 0.37 U 0.37 U 0.37 U 0.37 U 0.37 U 0.37 U 1.9 U

Yakima Canyon 6414063 BLS 0.4 U 0.4 U 0.4 U 0.4 U 0.21 J 0.4 U 0.4 U 0.4 U 2 U

Wapato-Toppenish 6484230 LSS 1.6 U 1.6 U 0.39 U 1.6 U 0.39 U 1.6 U 1.6 U 1.6 U 4.8 U

Wapato-Toppenish 6484231 LSS 0.77 UJ 0.77 UJ 0.39 U 0.77 U 0.39 U 0.77 U 0.77 U 0.77 UJ 0.39 U

Wapato-Toppenish 6484232 LSS 1.6 U 1.6 U 0.4 U 1.6 U 0.4 U 1.6 U 1.6 U 1.6 U 5 U

Wapato-Toppenish 6484234 NPM 0.4 U 0.4 U 0.4 U 0.4 U 0.4 U 0.4 U 0.4 U 0.4 U 5 U

Wapato-Toppenish 6484235 NPM 0.4 U 0.4 U 0.4 U 0.4 U 0.4 U 0.4 U 0.4 U 0.4 U 4.9 U

Wapato-Toppenish 6484236 NPM 0.4 U 0.4 U 0.4 U 0.4 U 0.4 U 0.4 U 0.4 U 0.4 U 10 J

Wapato-Toppenish 6484238 MWF 1.6 U 1.6 U 0.39 U 1.6 U 0.57 UJ 1.6 U 1.6 U 1.6 U 11 J

Wapato-Toppenish 6484239 MWF 0.77 UJ 0.77 UJ 0.38 U 0.77 U 0.57 UJ 1.6 0.77 U 0.77 UJ 10 J

Wapato-Toppenish 6484240 MWF 1.6 UJ 1.6 U 0.4 U 1.6 U 0.4 U 1.6 U 1.6 UJ 1.6 UJ 11 J Endrin Aldehyde Endrin Ketone Heptachlor Heptachlor Epoxide Hexachloro- benzene Endosulfan I Endosulfan II Endosulfan Sulfate Toxaphene
Yakima Pesticides/PCBs TMDL: Vol 1, WQ Study Findings 

Page 209 

Table D-1 continued. 

Reach Sample No. Species

Prosser 6454105 CRP 0.46 J 0.39 UJ 0.39 U 0.39 UJ 0.52 0.39 UJ 0.21 J 0.39 UJ 55 J

Prosser 6454106 CRP 0.35 J 0.39 UJ 0.39 U 0.39 UJ 1.3 0.39 UJ 0.22 J 0.53 J 63 J

Prosser 6454107 CRP 0.35 J 0.39 UJ 0.39 U 0.39 UJ 0.39 U 0.39 UJ 0.3 J 0.82 J 49 J

Prosser 6444234 SMB 0.39 U 0.39 U 0.39 U 0.39 U 0.39 U 0.39 U 0.39 U 0.39 U 4.9 U

Prosser 6444235 SMB 0.38 U 0.38 U 0.38 U 0.38 U 0.38 U 0.38 U 0.38 U 0.38 U 4.7 U

Prosser 6444236 SMB 0.4 U 0.4 U 0.4 U 0.4 U 0.4 U 0.4 U 0.4 U 0.4 U 4.9 U

Prosser 6444238 LSS 0.39 UJ 0.39 UJ 0.39 U 0.39 U 0.39 U 0.39 U 0.39 UJ 0.39 UJ 10 J

Prosser 6444239 LSS 0.39 UJ 0.39 UJ 0.39 U 0.39 U 0.39 U 0.39 U 0.39 UJ 0.39 UJ 4.9 U

Prosser 6444240 LSS 0.39 UJ 0.39 UJ 0.39 U 0.39 U 0.39 U 0.39 U 0.39 UJ 0.39 UJ 11 J

Horn Rapids 6444230 CRP 1.6 UJ 1.6 UJ 0.4 U 1.6 UJ 0.79 1.6 UJ 1.6 UJ 1.7 J 59 J

Horn Rapids 6444231 CRP 1.6 UJ 1.6 UJ 0.39 U 1.6 UJ 0.91 1.6 UJ 1.6 UJ 2.1 J 25 J

Horn Rapids 6444232 CRP 0.79 UJ 0.79 UJ 0.39 U 0.79 UJ 0.56 0.79 UJ 0.79 UJ 0.93 J 43 J

Horn Rapids 6444242 NPM 0.38 UJ 0.38 UJ 0.38 U 0.38 U 0.38 U 0.38 U 0.38 UJ 0.38 UJ 10 J

Horn Rapids 6444243 NPM 0.39 UJ 0.39 UJ 0.39 U 0.39 U 0.39 U 0.39 U 0.39 UJ 0.39 UJ 4.8 U

Horn Rapids 6444244 NPM 0.4 UJ 0.4 UJ 0.4 U 0.4 U 0.4 U 0.4 U 0.4 UJ 0.4 UJ 14 J

Horn Rapids 6454108 SMB 0.21 J 0.39 UJ 0.39 U 0.39 UJ 0.39 U 0.28 J 0.39 UJ 0.2 J 1.9 U

Horn Rapids 6454109 SMB 0.37 J 0.38 UJ 0.38 U 0.38 UJ 0.38 U 0.38 UJ 0.38 UJ 0.38 UJ 1.9 U

Horn Rapids 6454110 SMB 0.25 J 0.39 UJ 0.39 U 0.39 UJ 0.39 U 0.39 UJ 0.39 UJ 0.39 UJ 1.9 U

Horn Rapids 6454111 LSS 0.33 J 0.4 UJ 0.4 U 0.4 UJ 0.23 J 0.4 UJ 0.4 UJ 0.4 UJ 9.1 J

Horn Rapids 6454112 LSS 0.28 J 0.4 UJ 0.4 U 0.4 UJ 0.31 J 0.4 UJ 0.4 UJ 0.4 UJ 10 J

Horn Rapids 6454113 LSS 0.3 J 0.39 UJ 0.39 U 0.39 UJ 0.24 J 0.33 J 0.39 UJ 0.39 UJ 12 J

(--) Not analyzed for

U = The analyte was not detected at or above the reported result.

J = The analyte was positively identified. The associated numerical result is an estimate.

UJ = The analyte was not detected at or above the reported estimated result.

NJ = There is evidence that the analyte is present. The associated numerical result is an estimate.

BLS = bridgelip sucker LSS = largescale sucker

CRP = common carp MWF = mountain whitefish

CTT = cutthroat trout NPM = northern pikeminnow

KOK = kokanee SMB = smallmouth bass Endrin Aldehyde

Endrin KetoneHeptachlorHeptachlor EpoxideHexachlorobenzeneEndosulfan IEndosulfan IIEndosulfan SulfateToxaphene
Yakima Pesticides/PCBs TMDL: Vol 1, WQ Study Findings 

Page 210 

Table D-2. PCBs Concentrations in Yakima River Fish Fillet Samples, 2006 

(ug/Kg, wet weight, parts per billion). 

Reach Sample No. Species

Lipids (%)

Keechelus Lake 6394088 LSS 2.08 1.9 U 1.9 U 1.9 U 1.9 U 1.9 U 7.4 J 9 J 7.5 UJ 1.9 U 16 J

Keechelus Lake 6394089 LSS 1.56 1.9 U 1.9 U 1.9 U 1.9 U 1.9 U 8.1 J 7.8 J 6.6 UJ 1.9 U 16 J

Keechelus Lake 6394090 LSS 1.6 1.9 U 1.9 U 1.9 U 1.9 U 1.9 U 3.6 J 4.4 J 3.8 UJ 1.9 U 8 J

Keechelus Lake 6394092 NPM 1.13 2 U 2 U 2 U 2 U 2 U 6 J 8.9 J 7.9 UJ 2 U 15 J

Keechelus Lake 6394093 NPM 1.09 1.9 U 1.9 U 1.9 U 1.9 U 1.9 U 8 J 11 J 9.3 UJ 1.9 U 19 J

Keechelus Lake 6394095 KOK 2.54 1.9 U 1.9 U 1.9 U 1.9 U 1.9 U 11 J 4.6 J 5.6 UJ 1.9 U 16 J

Keechelus Lake 6394096 KOK 2.78 2 U 2 U 2 U 2 U 2 U 9.2 J 3.7 J 4 UJ 2 U 13 J

Keechelus Lake 6394097 KOK 3.33 2 U 2 U 2 U 2 U 4.9 UJ 12 J 5.8 J 3.9 UJ 2 U 18 J

Keechelus Lake 6394099 CTT 1.86 2 U 2 U 2 U 2 U 2 U 5.8 2.3 -- 2 U 8

Keechelus Lake 6394100 CTT 1.36 2 U 2 U 2 U 2 U 2 U 3.8 1.4 J -- 2 U 5 J

Keechelus Lake 6394101 CTT 1.09 2 U 2 U 2 U 2 U 2 U 2.5 0.48 J -- 2 U 3 J

Keechelus Lake 6394103 MWF 2.55 2 U 2 U 2 U 2 U 2 U 2 U 2 U 2.6 UJ 2 U 2 U

Keechelus Lake 6394104 MWF 2.96 2 U 2 U 2 U 2 U 2 U 6.3 J 3.3 J 3.9 UJ 2 U 10 J

Kachess Lake 6394080 LSS 0.69 2 U 2 U 2 U 2 U 2 U 2 U 2 U 2 U 2 U 2 U

Kachess Lake 6394081 LSS 0.48 2 U 2 U 2 U 2 U 2 U 2 U 2 U 2 U 2 U 2 U

Kachess Lake 6394082 LSS 0.55 2 U 2 U 2 U 2 U 2 U 2 U 2 U 2 U 2 U 2 U

Kachess Lake 6394084 NPM 0.58 2 U 2 U 2 U 2 U 5 UJ 13 J 4.5 J 5 UJ 2 U 18 J

Kachess Lake 6394085 NPM 0.86 1.8 U 1.8 U 1.8 U 1.8 U 4.6 UJ 19 J 6.6 J 5.5 UJ 1.8 U 26 J

Kachess Lake 6394086 NPM 0.6 2 U 2 U 2 U 2 U 4.9 UJ 15 J 7.2 J 5.9 UJ 2 U 22 J

Cle Elum 6414068 MWF 4.24 1.9 U 1.9 U 1.9 U 1.9 U 1.9 U 12 1.9 U -- 1.9 U 12

Cle Elum 6414069 MWF 5.09 1.9 U 1.9 U 1.9 U 1.9 U 1.9 U 19 7.8 -- 1.9 U 27

Cle Elum 6414070 MWF 4.42 2 U 2 U 2 U 2 U 2 U 14 5.7 -- 2 U 20

Cle Elum 6414072 BLS 4.03 1.9 U 1.9 U 1.9 U 1.9 U 1.9 U 7.6 3.6 -- 1.9 U 11

Cle Elum 6414073 BLS 2.8 2 U 2 U 2 U 2 U 2 U 6.3 1.5 J -- 2 U 8 J

Cle Elum 6414074 BLS 2.51 2 U 2 U 2 U 2 U 2 U 2 U 2 U 2 U 2 U 2 U

Cle Elum 6414076 NPM 1.98 2 U 2 U 2 U 2 U 2 U 4.8 J 2U 2U 2U 5 J

Cle Elum 6414077 NPM 1.73 1.9 U 1.9 U 1.9 U 1.9 U 1.9 U 4.6 J 1.9 U 1.9 U 1.9 U 5 J

Cle Elum 6414078 NPM 1.27 2 U 2 U 2 U 2 U 2 U 3.2 J 2.3 2U 2U 6 J

Yakima Canyon 6414050 MWF 4.51 2 U 2 U 2 U 2 U 2 U 17 7.1 -- 2 U 24

Yakima Canyon 6414051 MWF 5.43 2 U 2 U 2 U 2 U 2 U 15 6 -- 2 U 21

Yakima Canyon 6414052 MWF 4.67 2 U 2 U 2 U 2 U 2 U 20 8.7 -- 2 U 29

Yakima Canyon 6414057 NPM 2.87 2 U 2 U 2 U 2 U 2 U 21 13 -- 2 U 34

Yakima Canyon 6414058 NPM 2.04 1.9 U 1.9 U 1.9 U 1.9 U 1.9 U 16 7.1 -- 1.9 U 23

Yakima Canyon 6414059 NPM 1.76 1.9 U 1.9 U 1.9 U 1.9 U 1.9 U 10 4.3 -- 1.2 J 16 J

Yakima Canyon 6414061 BLS 4.72 1.9 U 1.9 U 1.9 U 1.9 U 1.9 U 15.0 7.0 -- 1.9 U 22

Yakima Canyon 6414062 BLS 2.16 1.9 U 1.9 U 1.9 U 1.9 U 1.9 U 2.4 1.9 U -- 1.9 U 2

Yakima Canyon 6414063 BLS 2.93 2 U 2 U 2 U 2 U 2 U 3.8 2 U -- 2 U 4

Wapato-Toppenish 6484230 LSS 3.33 1.9 U 1.9 U 1.9 U 1.9 U 3.9 J 7 3.1 4.8 UJ 1.9 U 14 J

Wapato-Toppenish 6484231 LSS 2.92 1.9 U 1.9 U 1.9 U 1.9 U 3.9 J 7.9 4.1 4.8 UJ 1.9 U 16 J

Wapato-Toppenish 6484232 LSS 3.25 2 U 2 U 2 U 2 U 4.6 J 8 3.4 5 UJ 2 U 16 J

Wapato-Toppenish 6484234 NPM 1.06 2 U 2 U 2 U 2 U 2 U 6.9 5 5 UJ 2 U 12 J

Wapato-Toppenish 6484235 NPM 1.1 2 U 2 U 2 U 2 U 4.9 UJ 5.6 4.1 J 4.9 UJ 2 U 10 J

Wapato-Toppenish 6484236 NPM 1.35 2 U 2 U 2 U 2 U 3.6 J 12 J 12 J 5 UJ 2 U 28 J

Wapato-Toppenish 6484238 MWF 3.15 2 U 2 U 2 U 2 U 6.2 J 17 J 7.3 9.9 UJ 2 U 31 J Aroclor 1016 Aroclor 1221 Aroclor 1232 Aroclor 1242 Aroclor 1248 Aroclor 1254 Aroclor 1260 Aroclor 1262 Aroclor 1268 Total PCB Aroclors
Yakima Pesticides/PCBs TMDL: Vol 1, WQ Study Findings 

Page 211 

Table D-2 continued. 

Reach Sample No. Species

Lipids (%)

Aroclor 1016Aroclor 1221Aroclor 1232Aroclor 1242Aroclor 1248Aroclor 1254Aroclor 1260Aroclor 1262Aroclor 1268

Total PCB 

Aroclors

Wapato-Toppenish 6484239 MWF 2.9 1.9 U 1.9 U 1.9 U 1.9 U 6.2 J 16 J 7.9 J 9.6 UJ 1.9 U 30 J

Wapato-Toppenish 6484240 MWF 3.02 2 U 2 U 2 U 2 U 5.3 J 11 J 5.2 J 5 UJ 2 U 22 J

Prosser 6454105 CRP 4.31 1.9 U 1.9 U 1.9 U 1.9 U 1.9 U 24 39 -- 1.9 U 63

Prosser 6454106 CRP 7.14 2 U 2 U 2 U 2 U 2 U 48 61 -- 2 U 109

Prosser 6454107 CRP 3.71 1.9 U 1.9 U 1.9 U 1.9 U 1.9 U 45 48 J -- 1.9 U 93 J

Prosser 6444234 SMB 0.62 2 U 2 U 2 U 2 U 2 U 3.6 J 2.6 2U 2U 6 J

Prosser 6444235 SMB 0.66 1.9 U 1.9 U 1.9 U 1.9 U 1.9 U 1.9 U 1.9 U 1.9 U 1.9 U 1.9 U

Prosser 6444236 SMB 0.3 2 U 2 U 2 U 2 U 2 U 2 U 2 U 2 U 2 U 2 U

Prosser 6444238 LSS 1.77 2 U 2 U 2 U 2 U 2 U 4.9 J 7.1 2U 2U 12 J

Prosser 6444239 LSS 2.01 2 U 2 U 2 U 2 U 2 U 11 J 7.2 9.8 UJ 2 U 18 J

Prosser 6444240 LSS 2.41 1.9 U 1.9 U 1.9 U 1.9 U 1.9 U 12 J 7.2 9.7 UJ 1.9 U 19 J

Horn Rapids 6444230 CRP 7.94 2 U 2 U 2 U 2 U 8.5 UJ 35 J 110 99 UJ 20 UJ 145 J

Horn Rapids 6444231 CRP 9.17 1.9 U 1.9 U 1.9 U 1.9 U 7.2 UJ 25 J 68 J 58 UJ 1.9 UJ 93

Horn Rapids 6444232 CRP 5.83 4.9 UJ 2 U 2 U 2 U 2 U 12 J 42 59 UJ 2 U 54 J

Horn Rapids 6444242 NPM 1.08 1.9 U 1.9 U 1.9 U 1.9 U 1.9 U 5.7 J 6.9 9.6 UJ 1.9 U 13 J

Horn Rapids 6444243 NPM 1.41 1.9 U 1.9 U 1.9 U 1.9 U 1.9 U 4.9 J 6 9.7 UJ 1.9 U 11 J

Horn Rapids 6444244 NPM 1.3 2 U 2 U 2 U 2 U 2 U 3.5 J 3.9 2 U 2 U 7 J

Horn Rapids 6454108 SMB 1.37 1.9 U 1.9 U 1.9 U 1.9 U 1.9 U 9.8 6.2 J -- 1.9 U 16 J

Horn Rapids 6454109 SMB 1.01 1.9 U 1.9 U 1.9 U 1.9 U 1.9 U 6.9 3.5 J -- 1.9 U 10 J

Horn Rapids 6454110 SMB 0.95 1.9 U 1.9 U 1.9 U 1.9 U 1.9 U 7.7 1.9 U -- 1.9 U 8

Horn Rapids 6454111 LSS 2.79 2 U 2 U 2 U 2 U 2 U 7.4 4 J -- 2 U 11 J

Horn Rapids 6454112 LSS 4.65 2 U 2 U 2 U 2 U 2 U 9.8 4.8 J -- 2 U 15 J

Horn Rapids 6454113 LSS 3.56 1.9 U 1.9 U 1.9 U 1.9 U 1.9 U 11 9.5 J -- 1.9 U 21 J

(--) Not analyzed for

U = The analyte was not detected at or above the reported result.

J = The analyte was positively identified. The associated numerical result is an estimate.

UJ = The analyte was not detected at or above the reported estimated result.

BLS = bridgelip sucker LSS = largescale sucker

CRP = common carp MWF = mountain whitefish

CTT = cutthroat trout NPM = northern pikeminnow

KOK = kokanee SMB = smallmouth bass
Yakima Pesticides/PCBs TMDL: Vol 1, WQ Study Findings 

Page 212 

Table D-3. Dioxin and Furan Concentrations in Yakima River Fish Fillet Samples, 2006 (ng/Kg, wet weight; p

Reach Sample No. Species

Lipids (%)

Keechelus Lake 394091 LSS 1.9 0.030 UJ 0.050 UJ 0.100 UJ 0.080 UJ 0.060 UJ 0.206 J 1.08 0.132 1.850 0.040 UJ 

Keechelus Lake 394094 NPM 1.7 0.030 UJ 0.050 UJ 0.100 UJ 0.080 UJ 0.060 UJ 0.125 J 0.230 UJ 0.120 1.80 0.040 UJ Keechelus Lake 394098 KOK 3.6 0.030 UJ 0.050 UJ 0.100 UJ 0.104 J 0.060 UJ 0.085 UJ 0.230 UJ 0.159 1.46 0.040 UJ 

Keechelus Lake 394102 CTT 2.2 0.030 UJ 0.080 UJ 0.100 UJ 0.080 J 0.060 UJ 0.085 UJ 0.230 UJ 0.105 0.507 0.040 UJ 

Keechelus Lake 394105 MWF 3.4 0.030 UJ 0.050 UJ 0.100 UJ 0.080 UJ 0.060 UJ 0.085 UJ 0.256 J 0.156 0.434 J 0.040 UJ 

Kachess Lake 394083 LSS 1.8 0.030 UJ 0.050 UJ 0.100 UJ 0.080 UJ 0.060 UJ 0.085 UJ 0.230 UJ 0.039 J 0.234 J 0.040 UJ Kachess Lake 394087 NPM 1.4 0.030 UJ 0.050 UJ 0.100 UJ 0.080 UJ 0.060 UJ 0.249 J 0.230 UJ 0.088 J 1.00 0.040 UJ 

Cle Elum 414071 MWF 5 0.030 UJ 0.050 UJ 0.100 UJ 0.124 J 0.060 UJ 0.197 J 0.230 UJ 0.329 0.682 0.040 UJ 

Cle Elum 414075 BLS 3.4 0.030 UJ 0.050 UJ 0.100 UJ 0.080 UJ 0.060 UJ 0.085 UJ 0.230 UJ 0.120 0.457 J 0.040 UJ 

Cle Elum 414079 NPM 2.9 0.030 UJ 0.050 UJ 0.100 UJ 0.080 UJ 0.060 UJ 0.189 J 0.290 J 0.144 0.509 0.040 UJ 

Canyon 414056 MWF 6.4 0.146 0.050 UJ 0.100 UJ 0.080 UJ 0.060 UJ 0.190 J 0.230 UJ 0.364 0.700 0.040 UJ Canyon 414060 NPM 2.8 0.030 UJ 0.050 UJ 0.100 UJ 0.080 UJ 0.060 UJ 0.085 UJ 0.230 UJ 0.156 0.787 0.040 UJ Canyon 414067 BLS 4.2 0.03 UJ 0.05 UJ 0.100 UJ 0.08 UJ 0.060 UJ 0.085 UJ 0.23 UJ 0.036 J 0.226 J 0.040 UJ Wapato-Toppenish 484233 LSS 4.7 0.03 UJ 0.05 UJ 0.10 UJ 0.08 UJ 0.06 UJ 0.085 UJ 0.23 UJ 0.27 0.05 UJ 0.042 UJ Wapato-Toppenish 484241 MWF 4.5 0.03 UJ 0.05 UJ 0.10 UJ 0.08 UJ 0.06 UJ 0.085 UJ 0.23 UJ 0.227 0.054 UJ 0.04 UJ 

Wapato-Toppenish 484237 NPM 1.7 0.242 J 0.267 J 0.10 UJ 0.08 UJ 0.06 UJ 0.085 UJ 0.969 0.998 0.066 UJ 0.075 UJ Prosser 454114 CRP 5.1 0.03 UJ 0.05 UJ 0.1 UJ 0.08 UJ 0.06 UJ 0.784 UJ 1.44 UJ 1.11 0.075 UJ 0.136 UJ Prosser 444241 LSS 3.1 0.031 J 0.05 UJ 0.1 UJ 0.08 UJ 0.06 UJ 0.142 J 0.728 0.625 0.05 UJ 0.04 UJ Prosser 444237 SMB 1.5 0.03 UJ 0.05 UJ 0.10 UJ 0.08 UJ 0.06 UJ 0.085 UJ 1.24 0.251 0.05 UJ 0.171 UJ 

Horn Rapids 444233 CRP 8.5 0.03 UJ 0.05 UJ 0.1 UJ 0.567 0.087 J 1.29 2.23 1.68 0.094 UJ 0.157 UJ Horn Rapids 454116 LSS 6.1 0.03 UJ 0.05 UJ 0.10 UJ 0.08 UJ 0.06 UJ 0.085 UJ 0.906 UJ 0.266 0.05 UJ 0.096 UJ Horn Rapids 444245 NPM 2.2 0.101 0.05 UJ 0.10 UJ 0.08 UJ 0.06 UJ 0.085 UJ 0.942 0.06 0.05 UJ 0.067 UJ Horn Rapids 454115 SMB 2.2 0.03 UJ 0.05 UJ 0.1 UJ 0.08 UJ 0.06 UJ 0.085 UJ 0.23 UJ 0.136 0.085 UJ 0.044 UJ 

U = The analyte was not detected at or above the reported result. BLS = bridgelip sucker LSS = largescale suckerJ = The analyte was positively identified. The associated numerical result is an estimate. CRP = common carp MWF = mountain whitefishUJ = The analyte was not detected at or above the reported estimated result. CTT = cutthroat trout NPM = northern pikeminnowTEQ = 2,3,7,8-TCDD toxicity equivalent based on toxicity KOK = kokanee SMB = smallmouth bassequivalency factors from Van den Berg et. al., 1998; Only detected chemicals were used in calculation.

2,3,7,8-TCDD

1,2,3,7,8-

PeCDD

1,2,3,4,7,8-

HxCDD

1,2,3,6,7,8-

HxCDD

1,2,3,7,8,9-

HxCDD

1,2,3,4,6,7,8-

HpCDD

OCDD

2,3,7,8-TCDF

1,2,3,7,8-

PeCDF

2,3,4,7,8-

PeCDF
Yakima Pesticides/PCBs TMDL: Vol 1, WQ Study Findings 

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Table D-3 continued. 

Reach Sample No. Species TEQ

Keechelus Lake 394091 LSS 0.060 UJ 0.070 UJ 0.085 UJ 0.309 J 0.358

Keechelus Lake 394094 NPM 0.060 UJ 0.070 UJ 0.085 UJ 0.200 UJ 0.205

Keechelus Lake 394098 KOK 0.060 UJ 0.070 UJ 0.085 UJ 0.200 UJ 0.194

Keechelus Lake 394102 CTT 0.060 UJ 0.070 UJ 0.085 UJ 0.200 UJ 0.069

Keechelus Lake 394105 MWF 0.060 UJ 0.070 UJ 0.085 UJ 0.200 UJ 0.083

Kachess Lake 394083 LSS 0.060 UJ 0.134 J 0.085 UJ 0.200 UJ 0.041

Kachess Lake 394087 NPM 0.060 UJ 0.070 UJ 0.085 UJ 0.200 UJ 0.158

Cle Elum 414071 MWF 0.060 UJ 0.070 UJ 0.085 UJ 0.200 UJ 0.133

Cle Elum 414075 BLS 0.060 UJ 0.070 UJ 0.085 UJ 0.200 UJ 0.058

Cle Elum 414079 NPM 0.060 UJ 0.070 UJ 0.085 UJ 0.200 UJ 0.113

Canyon 414056 MWF 0.060 UJ 0.070 UJ 0.085 UJ 0.200 UJ 0.140

Canyon 414060 NPM 0.060 UJ 0.070 UJ 0.085 UJ 0.200 UJ 0.095

Canyon 414067 BLS 0.060 UJ 0.070 UJ 0.085 UJ 0.200 UJ 0.026

Wapato-Toppenish 484233 LSS 0.06 UJ 0.07 UJ 0.085 UJ 0.20 UJ 0.091

Wapato-Toppenish 484241 MWF 0.06 UJ 0.07 UJ 0.085 UJ 0.20 UJ 0.049

Wapato-Toppenish 484237 NPM 0.06 UJ 0.158 J 0.085 UJ 0.20 UJ 0.309

Prosser 454114 CRP 0.06 UJ 0.19 J 0.085 UJ 0.971 0.319

Prosser 444241 LSS 0.06 UJ 0.07 UJ 0.085 UJ 0.2 UJ 0.167

Prosser 444237 SMB 0.06 UJ 0.279 0.085 UJ 0.20 UJ 0.246

Horn Rapids 444233 CRP 0.06 UJ 0.252 J 0.085 UJ 0.476 J 0.751

Horn Rapids 454116 LSS 0.06 UJ 0.07 UJ 0.085 UJ 0.581 0.121

Horn Rapids 444245 NPM 0.06 UJ 0.085 J 0.085 UJ 0.20 UJ 0.19

Horn Rapids 454115 SMB 0.06 UJ 0.07 UJ 0.085 UJ 0.2 UJ 0.056

U = The analyte was not detected at or above the reported result.

J = The analyte was positively identified. The associated numerical result is an estimate.

UJ = The analyte was not detected at or above the reported estimated result.

TEQ = 2,3,7,8-TCDD toxicity equivalent based on toxicity equivalency 

factors from Van den Berg et al., 1998; 

Only detected chemicals were used in calculation.

1,2,3,7,8,9-HxCDF1,2,3,4,6,7,8-HpCDF1,2,3,4,7,8,9-HpCDFOCDF
Yakima Pesticides/PCBs TMDL: Vol 1, WQ Study Findings 

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Table D-4. PBDE Concentrations in Yakima River Fish Fillets, 2006 (ug/Kg, wet weight, parts per billion). 

Reach Sample No. Species

Lipids (%)

Keechelus Lake 6394088 LSS 2.08 5 0.2 U 0.2 U 0.2 U 0.2 U 0.8 0.4 U 0.13 J 0.36 J 0.4 U 

Keechelus Lake 6394093 NPM 1.09 1 0.13 J 0.2 U 0.2 U 0.2 U 0.57 0.39 U 0.39 U 0.28 J 0.39 U 

Keechelus Lake 6394099 CTT 1.86 1 0.2 U 0.2 U 0.2 U 0.4 0.18 J 0.4 U 0.13 J 0.14 J 0.4 U 

Keechelus Lake 6394103 MWF 2.55 1 0.2 U 0.2 U 0.2 U 0.9 0.31 0.4 U 0.16 J 0.16 J 0.4 U 

Kachess Lake 6394080 LSS 0.69 5 0.19 U 0.19 U 0.19 U 0.19 U 0.19 U 0.39 U 0.39 U 0.19 U 0.39 U 

Kachess Lake 6394084 NPM 0.58 1 0.16 J 0.19 U 0.19 U 0.19 U 0.33 0.39 U 0.12 J 0.2 J 0.39 U Yakima Canyon 6414050 MWF 4.51 26 1.3 1 0.2 U 18 5.5 0.39 U 1.6 1.3 0.39 U 

Yakima Canyon 6414057 NPM 2.87 17 0.71 0.2 U 0.2 U 0.2 U 3.6 0.39 U 0.22 J 1.2 0.39 U 

Yakima Canyon 6414061 BLS 4.72 18 0.51 0.2 U 0.2 U 0.2 U 2.4 0.39 U 0.31 J 0.67 0.39 U 

Wapato-Toppenish 6484230 LSS 3.33 33 0.58 0.2 U 0.2 U 0.2 J 4.2 0.4 U 0.85 1 0.4 U 

Wapato-Toppenish 6484234 NPM 1.06 15 0.52 0.2 U 0.2 U 0.2 U 2.9 0.39 U 0.32 J 0.69 0.39 U 

Wapato-Toppenish 6484238 MWF 3.15 94 2.7 2.6 0.19 U 61.6 19.1 0.38 U 5.5 3.3 0.38 U Wapato-Toppenish 6484239 MWF 2.9 95 2.5 3 0.2 U 68.3 20.6 0.4 U 6.8 4.2 0.4 U U = The analyte was not detected at or above the reported result.J = The analyte was positively identified. The associated numerical result is an estimate.BLS = bridgelip suckerCTT = cutthroat troutLSS = largescale sucker

MWF = mountain whitefishNPM = northern pikeminnow

PBDE - 47

PBDE - 49

PBDE - 66

PBDE - 71

PBDE - 99

PBDE - 100

PBDE - 138

PBDE - 153

PBDE - 154

PBDE - 183
Yakima Pesticides/PCBs TMDL: Vol 1, WQ Study Findings 

Page 215 

Appendix E. Pesticides Analyzed in Surface Water and in 

Effluents from Fruit Packers and Vegetable Processors 

during the 2007-08 Yakima River Water Quality Study 

4,4'-DDE 

4,4'-DDD 

4,4'-DDT 

Dieldrin 

cis-Chlordane 

trans-Chlordane 

cis-Nonachlor 

trans-Nonachlor 

Oxychlordane 

alpha-BHC 

beta-BHC 

gamma-BHC (Lindane) 

delta-BHC 

Chlorpyrifos 

Endosulfan I 

Endosulfan II 

Endosulfan Sulfate 

Toxaphene 

Heptachlor 

Heptachlor epoxide 

Aldrin 

Endrin 

Endrin Ketone 

Endrin Aldehyde 

Methoxychlor 

Hexachlorobenzene 

 
Yakima Pesticides/PCBs TMDL: Vol 1, WQ Study Findings 

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This page is purposely left blank 
Yakima Pesticides/PCBs TMDL: Vol 1, WQ Study Findings 

Page 217 

Appendix F. Deployment Dates and PRC Recovery for 

SPMDs 

Table F-1. Deployment Dates and PRC Concentrations for May-June 2007 SPMDs. 

[Each sample consisted of five standard SPMD membranes. Each membrane was 4.50 

grams/0.00495 L.] 

 

Sample 

Number 

(723- ) 

Site Start End Deploy 

 Time 

Final PRC 

Concentrations 

(1,000 ng/sample 

starting ) 

Date Time Date Time (days) PCB-4 PCB-29 

4180 EASTON 5/8/07 8:00 6/5/07 8:00 28.0 228 496 

4182 TOWNE DIV 5/8/07 9:30 6/5/07 9:00 28.0 272 839 

4183 WILSON CR* 5/7/08 12:50 6/6/08 8:20 31.8 80 338 

4184 ROZA DAM 5/8/07 11:45 6/5/07 10:45 27.9 280 820 

4185 NACHES R 5/8/07 13:10 6/11/07 11:20 31.9 170 578 

4186 MOXEE 5/8/07 14:20 6/5/07 11:55 27.9 108 517 

4187 SUNNYSIDE 5/9/07 8:35 6/5/07 12:30 27.2 116 574 

4188 GRANGER 5/9/07 9:35 6/5/07 13:15 27.2 114 534 

4189 SULPHUR 5/9/07 10:45 6/5/07 13:50 27.1 149 608 

4190 SULPHUR REP 5/9/07 10:45 6/5/07 13:50 27.1 114 736 

4192 PROSSER 5/9/07 13:35 6/6/07 9:40 27.8 113 466 

4193 PROSSER REP 5/9/07 13:35 6/6/07 9:40 27.8 177 619 

4194 SPRING CR 5/9/07 12:10 6/5/07 15:25 27.1 161 584 

4195 HORN RAPIDS 5/8/07 16:55 6/5/07 16:00 28.3 101 488 

4181 FIELD BLNK (Easton) - - - - - - - - - - 

4191 FIELD BLNK (Sulphur) - - - - - - - - - - 

*Original sample from 2007 lost in laboratory accident; re-deployed in 2008. 
Yakima Pesticides/PCBs TMDL: Vol 1, WQ Study Findings 

Page 218 

Table F-2. Deployment Dates and PRC Concentrations for October-November 2007 SPMDs. 

[Each sample consisted of five standard SPMD membranes. Each membrane was 4.50 

grams/0.00495 L.]

 

Sample 

Number 

(748- ) 

Site Start End Deploy 

 Time 

Final PRC 

Concentrations 

(1,000 ng/sample 

starting ) 

Date Time Date Time (days) PCB-4 PCB-29 

4250 EASTON 10/30/07 7:55 11/26/07 8:15 27.0 355 603 

4252 TOWNE DIV 10/30/07 9:20 11/26/07 9:30 27.0 356 644 

4253 WILSON CR 10/30/07 10:30 11/26/07 10:30 27.0 277 560 

4254 ROZA DAM 10/30/07 11:45 11/26/07 11:20 26.0 264 627 

4255 NACHES R 10/30/07 13:15 11/26/07 12:25 26.0 328 665 

4256 MOXEE 10/30/07 14:45 11/26/07 13:25 26.9 252 648 

4257 SUNNYSIDE 10/30/07 14:00 11/26/07 14:10 27.0 198 518 

4258 GRANGER 10/30/07 15:35 11/26/07 15:00 26.0 187 560 

4259 SULPHUR 10/30/07 16:29 11/26/07 15:45 25.0 135 406 

4261 PROSSER 10/31/07 8:30 11/27/07 8:35 27.0 225 431 

4262 PROSSER REP 10/31/07 8:30 11/27/07 8:35 27.0 196 255 

4263 SPRING CR 10/31/07 11:10 11/26/07 9:15 25.9 381 673 

4264 HORN RAPIDS 10/31/07 10:00 11/27/07 10:25 27.0 193 443 

4251 FIELD BLNK (Easton) - - - - - - - - - - - - - - 

4260 FIELD BLNK (Sulphur) - - - - - - - - - - - - - - 
Yakima Pesticides/PCBs TMDL: Vol 1, WQ Study Findings 

Page 219 

Appendix G. Ancillary Water Quality Data for SPMD 

Deployments 
Yakima Pesticides/PCBs TMDL: Vol 1, WQ Study Findings 

Page 220 

Table G-1. Ancillary Water Quality Data for Spring 2007 SPMD Deployments 

Sample 

No. Field ID 

Collection 

Date Parameter Result Units 

7194080 EASTON 5/8/2007 Conductivity 49.3 umhos/cm 

7194080 EASTON 5/8/2007 Dissolved Organic Carbon 1 U mg/L 

7194080 EASTON 5/8/2007 Total Organic Carbon 1 U mg/L 

7194080 EASTON 5/8/2007 Total Suspended Solids 2 mg/L 

7194080 EASTON 5/8/2007 Turbidity 1.6 NTU 

7214095 EASTON 5/22/2007 Conductivity 46 umhos/cm 

7214095 EASTON 5/22/2007 Dissolved Organic Carbon 1 U mg/L 

7214095 EASTON 5/22/2007 Total Suspended Solids 1 mg/L 

7214095 EASTON 5/22/2007 Turbidity 1.3 NTU 

7234210 EASTON 6/5/2007 Conductivity 45 umhos/cm 

7234210 EASTON 6/5/2007 Dissolved Organic Carbon 1 U mg/L 

7234210 EASTON 6/5/2007 Total Non-Volatile Suspended Solids 1 U mg/L 

7234210 EASTON 6/5/2007 Total Organic Carbon 1 U mg/L 

7234210 EASTON 6/5/2007 Total Suspended Solids 1 U mg/L 

7234210 EASTON 6/5/2007 Turbidity 1.1 NTU 

7194081 TOWNE DIV 5/8/2007 Conductivity 80.4 umhos/cm 

7194081 TOWNE DIV 5/8/2007 Dissolved Organic Carbon 1.5 mg/L 

7194081 TOWNE DIV 5/8/2007 Total Organic Carbon 1.1 mg/L 

7194081 TOWNE DIV 5/8/2007 Total Suspended Solids 10 mg/L 

7194081 TOWNE DIV 5/8/2007 Turbidity 4.1 NTU 

7234211 TOWNE DIV 6/5/2007 Conductivity 58 umhos/cm 

7234211 TOWNE DIV 6/5/2007 Dissolved Organic Carbon 1 U mg/L 

7234211 TOWNE DIV 6/5/2007 Total Non-Volatile Suspended Solids 23 mg/L 

7234211 TOWNE DIV 6/5/2007 Total Organic Carbon 1.2 mg/L 

7234211 TOWNE DIV 6/5/2007 Total Suspended Solids 27 mg/L 

7234211 TOWNE DIV 6/5/2007 Turbidity 12 NTU 

7194082 WILSON CR 5/8/2007 Conductivity 232 umhos/cm 

7194082 WILSON CR 5/8/2007 Dissolved Organic Carbon 3.8 mg/L 

7194082 WILSON CR 5/8/2007 Total Organic Carbon 4 mg/L 

7194082 WILSON CR 5/8/2007 Total Suspended Solids 50 mg/L 

7194082 WILSON CR 5/8/2007 Turbidity 20 NTU 

7234212 WILSON CR 6/5/2007 Conductivity 253 umhos/cm 

7234212 WILSON CR 6/5/2007 Dissolved Organic Carbon 3.8 mg/L 

7234212 WILSON CR 6/5/2007 Total Non-Volatile Suspended Solids 46 mg/L 

7234212 WILSON CR 6/5/2007 Total Organic Carbon 4.5 mg/L 

7234212 WILSON CR 6/5/2007 Total Suspended Solids 54 mg/L 

7234212 WILSON CR 6/5/2007 Turbidity 18 NTU 

7194083 ROZA DAM 5/8/2007 Conductivity 118 umhos/cm 

7194083 ROZA DAM 5/8/2007 Dissolved Organic Carbon 1.8 mg/L 

7194083 ROZA DAM 5/8/2007 Total Organic Carbon 1.9 mg/L 

7194083 ROZA DAM 5/8/2007 Total Suspended Solids 4 mg/L 

7194083 ROZA DAM 5/8/2007 Turbidity 3.4 NTU 

7214098 ROZA DAM 5/22/2007 Conductivity 97 umhos/cm 

7214098 ROZA DAM 5/22/2007 Dissolved Organic Carbon 1.6 mg/L 

7214098 ROZA DAM 5/22/2007 Total Organic Carbon 1.9 mg/L 

7214098 ROZA DAM 5/22/2007 Total Suspended Solids 13 mg/L 
Yakima Pesticides/PCBs TMDL: Vol 1, WQ Study Findings 

Page 221 

Sample 

No. Field ID 

Collection 

Date Parameter Result Units 

7214098 ROZA DAM 5/22/2007 Turbidity 6.6 NTU 

7234213 ROZA DAM 6/5/2007 Conductivity 78 umhos/cm 

7234213 ROZA DAM 6/5/2007 Dissolved Organic Carbon 1.2 mg/L 

7234213 ROZA DAM 6/5/2007 Total Non-Volatile Suspended Solids 20 mg/L 

7234213 ROZA DAM 6/5/2007 Total Organic Carbon 1.5 mg/L 

7234213 ROZA DAM 6/5/2007 Total Suspended Solids 23 mg/L 

7234213 ROZA DAM 6/5/2007 Turbidity 14 NTU 

7194084 NACHES R. 5/8/2007 Dissolved Organic Carbon 1.3 mg/L 

7194084 NACHES R. 5/8/2007 Total Organic Carbon 1.7 mg/L 

7234214 NACHES R. 6/5/2007 Dissolved Organic Carbon 1.2 mg/L 

7234214 NACHES R. 6/5/2007 Total Organic Carbon 2 mg/L 

7194085 MOXEE 5/8/2007 Dissolved Organic Carbon 2.4 mg/L 

7194085 MOXEE 5/8/2007 Total Organic Carbon 2.5 mg/L 

7234215 MOXEE 6/5/2007 Dissolved Organic Carbon 1.8 mg/L 

7234215 MOXEE 6/5/2007 Total Organic Carbon 2.1 mg/L 

7194086 SUNNYSIDE 5/9/2007 Dissolved Organic Carbon 1.6 mg/L 

7194086 SUNNYSIDE 5/9/2007 Total Organic Carbon 2.1 mg/L 

7214104 SUNNYSIDE 5/22/2007 Dissolved Organic Carbon 1.7 mg/L 

7214104 SUNNYSIDE 5/22/2007 Total Organic Carbon 1.8 mg/L 

7234216 SUNNYSIDE 6/5/2007 Dissolved Organic Carbon 1.2 mg/L 

7234216 SUNNYSIDE 6/5/2007 Total Organic Carbon 1.8 mg/L 

7194087 GRANGER 5/9/2007 Dissolved Organic Carbon 2.7 mg/L 

7194087 GRANGER 5/9/2007 Total Organic Carbon 3.5 mg/L 

7234217 GRANGER 6/5/2007 Dissolved Organic Carbon 4.2 mg/L 

7234217 GRANGER 6/5/2007 Total Organic Carbon 4.9 mg/L 

7194088 SULPHUR 5/9/2007 Dissolved Organic Carbon 2 mg/L 

7194088 SULPHUR 5/9/2007 Total Organic Carbon 2.9 mg/L 

7234218 SULPHUR 6/5/2007 Dissolved Organic Carbon 2.3 mg/L 

7234218 SULPHUR 6/5/2007 Total Organic Carbon 2.9 mg/L 

7194093 SULPHUR-REP 5/9/2007 Dissolved Organic Carbon 2.4 mg/L 

7194093 SULPHUR-REP 5/9/2007 Total Organic Carbon 2.5 mg/L 

7194089 PROSS DM 5/9/2007 Dissolved Organic Carbon 1.8 mg/L 

7194089 PROSS DM 5/9/2007 Total Organic Carbon 2.6 mg/L 

7194090 PROSSER-REP 5/9/2007 Total Organic Carbon 2.6 mg/L 

7224102 PROSS DM 5/30/2007 Dissolved Organic Carbon 1.4 mg/L 

7224102 PROSS DM 5/30/2007 Total Organic Carbon 1.6 mg/L 

7234219 PROSS DM 6/5/2007 Dissolved Organic Carbon 1.5 mg/L 

7234219 PROSS DM 6/5/2007 Total Organic Carbon 1.9 mg/L 

7194091 SPRING CR 5/9/2007 Dissolved Organic Carbon 2.8 mg/L 

7194091 SPRING CR 5/9/2007 Total Organic Carbon 3.3 mg/L 

7234220 SPRING CR 6/5/2007 Dissolved Organic Carbon 2.3 mg/L 

7234220 SPRING CR 6/5/2007 Total Organic Carbon 2.9 mg/L 

7194092 HORNRAPID 5/8/2007 Dissolved Organic Carbon 1.9 mg/L 

7194092 HORNRAPID 5/8/2007 Total Organic Carbon 2.4 mg/L 

7234221 HORNRAPID 6/5/2007 Dissolved Organic Carbon 1.5 mg/L 

7234221 HORNRAPID 6/5/2007 Total Organic Carbon 2.1 mg/L 

U = not detected 
Yakima Pesticides/PCBs TMDL: Vol 1, WQ Study Findings 

Page 222 

Table G-2. Ancillary Water Quality Data for Fall 2007 SPMD Deployments. 

Sample 

No. 

Field 

ID 

Collection 

Date 

Total 

Organic 

Carbon 

(mg/L) 

Dissolved 

Organic 

Carbon 

(mg/L) 

Total 

Suspended 

Solids 

(mg/L) 

Turbidity 

(NTU) 

Conductivity 

(umhos/cm) 

7444205 EASTON 10/30/2007 1.0 U 1.0 U 2.0 2.1 60.5 

7484230 EASTON 11/26/2007 1.0 U 1.0 U 2 1.3 59.4 

7444206 TOWNE DIV 10/30/2007 1.0 U 1.0 U 1 0.5 82 

7474205 TOWNE DIV 11/16/2007 1.0 U 1.0 U 1 U na na 

7484231 TOWNE DIV 11/26/2007 1.0 U 1.0 U 2 0.7 83.1 

7444207 WILSON CR 10/30/2007 2.1 1.8 21 3.4 369 

7474206 WILSON 11/16/2007 2.0 U 1.7 8 na na 

7484232 WILSON 11/26/2007 1.6 1.8 10 3.5 387 

7444208 ROZA DAM 10/30/2007 1.4 2.0 U 30 11 152 

7444209 ROZA-REP 10/30/2007 1.5 1.1 29 9.8 151 

7484233 ROZA DAM 11/26/2007 1.0 U 1.0 U 5 1.4 142 

7444210 NACHES R. 10/30/2007 1.5 1.0 U 

7474208 NACHES R. 11/16/2007 1.0 U 1.0 U 

7484235 NACHES R. 11/26/2007 1.0 U 1.0 U 

7444211 MOXEE 10/30/2007 2.8 2.4 

7474207 MOXEE 11/16/2007 2.6 J 2.4 

7484236 MOXEE 11/26/2007 2.8 2.5 

7444212 SUNNYSIDE 10/30/2007 1.5 1 

7474214 SUNNYSIDE 11/16/2007 1.1 1.1 

7484237 SUNNYSIDE 11/26/2007 1.1 1.0 U 

7444213 GRANGER 10/30/2007 3.1 2.5 

7474209 GRANGER 11/16/2007 2.1 1.9 

7484238 GRANGER 11/26/2007 2.8 2.5 

7444214 SULPHUR 10/31/2007 2.8 2.3 

7474211 SULPHUR 11/16/2007 2.4 J 2.2 

7484239 SULPHUR 11/26/2007 2.7 2.4 

7444215 PROSSER DM 10/31/2007 1.4 1.1 

7444216 PROSSER-REP 10/31/2007 1.4 1.1 

7474212 PROSSER DM 11/16/2007 1.3 1.1 

7484240 PROSSER DM 11/27/2007 1.3 1.2 

7484241 PROSSER-REP 11/27/2007 1.2 1.1 

7444217 SPRING CR. 10/31/2007 2.3 1.8 

7474210 SPRING CR. 11/16/2007 2.3 2.0 

7484242 SPRING CR. 11/27/2007 2.1 2.2 

7444218 HORN RAPIDS 10/31/2007 1.5 1.2 

7474213 HORN RAPIDS 11/16/2007 1.3 1.1 

7484243 HORN RAPIDS 11/26/2007 1.2 1.3 

 

U = not detected 

J = estimated 

na = not analyzed 
Yakima Pesticides/PCBs TMDL: Vol 1, WQ Study Findings 

Page 223 

Appendix H. SPMD Calculations 

The loss rates of Performance Reference Compounds (PRCs) are used to calibrate SPMDs for 

the effects of water velocity, temperature, and biofouling (Huckins et al., 2006). Each of the 

SPMD membranes used in the present study was spiked with the PRCs PCB-4 and PCB-29 prior 

to their being deployed in the field. PCB-4 and -29 are not present in significant amounts in the 

environment. Water column concentrations of PCBs and toxaphene were calculated from the 

residues accumulated in the SPMD and PRC loss rates using the SPMD Water Concentration 

Calculator Excel spreadsheet version 5-1 developed by USGS 

(http://137.227.231.90/Research/spmd.htm). The PRC recovery data are in Appendix F. 

SPMDs only take up the dissolved form of a chemical. Total PCB and toxaphene concentrations 

were estimated from the dissolved residues using the equation Cw-tot = Cw (1 + TOC (Koc/Mw)) 

where Cw is the dissolved concentration, Koc is the organic carbon-water equilibrium partition 

coefficient, and Mw is the mass of water (Meadows et al., 1998). Koc was calculated from the 

Kow values used to determine the dissolved concentrations in the SPMD Water Concentration 

Calculator spreadsheet and Karickhoff’s (1981) approximation Koc = 0.411Kow. 
Yakima Pesticides/PCBs TMDL: Vol 1, WQ Study Findings 

Page 224 

Appendix I. Pesticides Analyzed in Wastewater Treatment 

Plant Effluents and Urban Stormwater Runoff during the 

2007-08 Yakima River Water Quality Study 

Pesticides 

4,4'-DDE 

4,4'-DDD 

4,4'-DDT 

Dieldrin 

Chlordane (technical) 

alpha-BHC 

beta-BHC 

gamma-BHC (Lindane) 

delta-BHC 

Chlorpyrifos 

Endosulfan I 

Endosulfan II 

Endosulfan Sulfate 

Toxaphene 

Heptachlor 

Heptachlor epoxide 

Aldrin 

Endrin 

Endrin Ketone 

Endrin Aldehyde 

Methoxychlor 

Hexachlorobenzene 

Polychlorinated Biphenyls 

209 individual PCB congeners 

(see Method 1668A - http://synetics.net/resources) 
Yakima Pesticides/PCBs TMDL: Vol 1, WQ Study Findings 

Page 225 

Appendix J. Routine Monitoring Data for Surface Water, 

2007-08 

Collection Flow 

Sample No. Field ID Date (cfs) (ng/L) (ng/L) (ng/L)

7144080 CHERRY 4/4/2007 198 0.063 U 0.081 0.063 U

7144081 WIPPLE 4/4/2007 23 0.065 U 0.08 0.065 U

7144082 HARRISON 4/4/2007 2,074 0.066 U 0.066 U 0.066 U

7144085 PARKER 4/4/2007 5,368 0.065 U 0.15 0.065 U

7144088 EUCLID 4/5/2007 6,452 0.067 0.34 0.08

7144090 KIONA 4/5/2007 6,331 0.096 0.4 0.1

7144083 NACHES 4/4/2007 3,188 0.089 0.23 0.064 U

7144084 MOXEE 4/4/2007 69 0.43 0.79 0.46

7144086 GRANGER 4/5/2007 24 0.17 1.9 0.36

7144091 GRANGER REP 4/5/2007 - - 0.17 1.9 0.36

7144087 SULFUR 4/5/2007 182 0.15 1 0.23

7144089 SPRING 4/5/2007 54 2.9 2 0.73

7144092 TRNSFR BLNK 4/5/2007 - - 0.063 U 0.063 U 0.063 U

7164080 CHERRY 4/18/2007 156 0.1 0.13 0.062 U

7164081 WIPPLE 4/18/2007 45 0.077 0.32 0.066

7164082 HARRISON 4/18/2007 880 0.063 U 0.063 U 0.063 U

7164085 PARKER 4/18/2007 3,217 0.063 U 0.17 0.063 U

7164088 EUCLID 4/19/2007 4,044 0.063 U 0.2 0.063 U

7164090 KIONA 4/19/2007 4,257 0.064 U 0.26 0.074

7164083 NACHES 4/18/2007 2,868 0.12 0.28 0.063 U

7164084 MOXEE 4/18/2007 52 0.2 0.79 0.16

7164086 GRANGER 4/19/2007 25 0.25 2.1 0.35

7164087 SULFUR 4/19/2007 131 0.16 1.2 0.23

7164089 SPRING 4/19/2007 28 0.16 0.48 0.15

7184080 CHERRY 5/2/2007 459 0.59 J 0.62 J 0.066 J

7184081 WIPPLE 5/2/2007 104 0.2 0.64 0.063 U

7184082 HARRISON 5/2/2007 1,653 0.063 U 0.063 U 0.063 U

7184085 PARKER 5/2/2007 3,197 0.062 U 0.11 0.062 U

7184088 EUCLID 5/3/2007 3,999 0.062 U 0.25 0.074

7184090 KIONA 5/3/2007 4,017 0.063 U 0.23 0.064

7184083 NACHES 5/2/2007 2,571 0.063 U 0.16 0.063 U

7184084 MOXEE 5/2/2007 99 0.305 1.1 0.24

7184091 MOXEE REP 5/2/2007 - - 0.24 1.1 0.23

7184086 GRANGER 5/3/2007 28 0.21 1.8 0.32

7184087 SULFUR 5/3/2007 222 0.14 1.1 0.23

7184089 SPRING 5/3/2007 18 0.12 0.53 0.14

4,4'-DDT 4,4'-DDE 4,4'-DDD

U = not detected at or above reported value J = estimated na = not analyzed 
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Collection 

Field ID Date (ng/L) (ng/L) (ng/L) (ng/L) (ng/L)

CHERRY 4/4/2007 0.19 UJ 0.51 0.37 0.15 J 0.35

WIPPLE 4/4/2007 0.32 UJ 1.3 0.19 J 0.15 J 0.74

HARRISON 4/4/2007 0.12 UJ 0.89 0.43 0.24 0.45 J

PARKER 4/4/2007 0.067 UJ 4.1 1.1 0.35 0.44

EUCLID 4/5/2007 0.32 U 8.2 1.8 0.63 1.1

KIONA 4/5/2007 0.13 UJ 16 1.6 0.68 1.6 J

NACHES 4/4/2007 0.064 U 3.6 0.96 0.25 J 0.42 J

MOXEE 4/4/2007 0.1 UJ 88 1.7 0.78 1.9

GRANGER 4/5/2007 0.17 UJ 18 3.7 1.9 2.6

GRANGER REP 4/5/2007 0.16 UJ 18 3.7 1.8 2.5

SULFUR 4/5/2007 0.16 UJ 46 10 4.8 4.6

SPRING 4/5/2007 0.27 UJ 82 3.3 1.4 5.1

TRNSFR BLNK 4/5/2007 0.063 U 0.063 U 0.063 U 0.063 U 0.063 U

CHERRY 4/18/2007 0.28 J 0.12 J 0.062 UJ 0.062 UJ 0.09 J

WIPPLE 4/18/2007 0.21 0.33 0.064 0.062 U 0.15 UJ

HARRISON 4/18/2007 0.071 UJ 0.17 0.084 0.063 U 0.094 UJ

PARKER 4/18/2007 0.072 UJ 2.4 0.21 0.092 0.3 UJ

EUCLID 4/19/2007 0.063 UJ 4.4 1 J 0.33 J 0.52 UJ

KIONA 4/19/2007 0.085 J 3.3 0.33 J 0.14 J 0.46 J

NACHES 4/18/2007 0.063 U 2.7 0.17 J 0.063 J 0.33 UJ

MOXEE 4/18/2007 0.061 U 5.9 0.53 0.28 0.68

GRANGER 4/19/2007 0.1 3.7 0.82 0.45 1.2

SULFUR 4/19/2007 0.23 5.5 0.5 0.28 J 1.3

SPRING 4/19/2007 0.22 14 0.15 J 0.063 UJ 2.2 J

CHERRY 5/2/2007 1.6 4.4 0.24 0.11 0.27 J

WIPPLE 5/2/2007 0.62 UJ 0.31 0.17 UJ 0.11 0.27 J

HARRISON 5/2/2007 0.13 UJ 0.25 0.15 UJ 0.063 U 0.14 J

PARKER 5/2/2007 0.1 UJ 0.74 0.24 0.062 U 0.14 J

EUCLID 5/3/2007 0.078 UJ 1.3 0.38 0.089 J 0.48 J

KIONA 5/3/2007 0.067 UJ 1.5 0.27 0.15 0.54 J

NACHES 5/2/2007 0.063 U 0.61 0.22 UJ 0.13 J 0.21 J

MOXEE 5/2/2007 0.1265 U 2 J 2 1.05 1.5

MOXEE REP 5/2/2007 0.063 U 2.1 J 2 1.1 1.6

GRANGER 5/3/2007 0.13 UJ 1.5 0.31 0.19 0.69 J

SULFUR 5/3/2007 0.23 UJ 3.1 1.4 0.34 0.73

SPRING 5/3/2007 0.14 J 4.3 0.71 0.18 1.4

Dieldrin Chlorpyrifos

Endosulfan 

Sulfate

Endosulfan 

II

Endosulfan 

I

U = not detected at or above reported value J = estimated na = not analyzed 
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Collection 

Field ID Date (ng/L) (ng/L) (ng/L) (ng/L) (ng/L) (ng/L)

CHERRY 4/4/2007 3.2 U 0.063 U 0.063 U 0.063 U 0.063 U 0.063 U

WIPPLE 4/4/2007 3.2 U 0.065 U 0.065 U 0.065 U 0.065 U 0.065 UJ

HARRISON 4/4/2007 3.3 U 0.066 U 0.066 U 0.066 U 0.066 U 0.066 U

PARKER 4/4/2007 3.3 U 0.065 U 0.065 U 0.065 U 0.065 U 0.065 U

EUCLID 4/5/2007 3.2 U 0.064 U 0.064 U 0.064 U 0.064 U 0.064 U

KIONA 4/5/2007 3.1 U 0.063 U 0.063 U 0.063 U 0.063 U 0.063 U

NACHES 4/4/2007 3.2 U 0.064 U 0.064 U 0.064 U 0.064 U 0.064 U

MOXEE 4/4/2007 3.2 U 0.064 U 0.064 U 0.064 U 0.064 U 0.064 U

GRANGER 4/5/2007 3.2 U 0.064 U 0.064 U 0.064 U 0.064 U 0.064 U

GRANGER REP 4/5/2007 3.2 U 0.065 U 0.065 U 0.065 U 0.065 U 0.065 U

SULFUR 4/5/2007 3.3 U 0.065 U 0.065 U 0.068 UJ 0.065 U 0.065 U

SPRING 4/5/2007 3.2 U 0.065 U 0.065 U 0.065 U 0.065 U 0.065 U

TRNSFR BLNK 4/5/2007 3.1 U 0.063 U 0.063 U 0.063 U 0.063 U 0.063 U

CHERRY 4/18/2007 3.1 U 0.062 U 0.062 U 0.062 U 0.062 U 0.062 U

WIPPLE 4/18/2007 3.1 U 0.062 U 0.062 U 0.062 U 0.062 U 0.062 U

HARRISON 4/18/2007 3.1 U 0.063 U 0.063 U 0.063 U 0.063 U 0.063 U

PARKER 4/18/2007 3.2 U 0.063 U 0.063 U 0.063 U 0.063 U 0.063 U

EUCLID 4/19/2007 3.1 U 0.063 U 0.063 U 0.063 U 0.063 U 0.063 U

KIONA 4/19/2007 3.2 U 0.064 U 0.064 U 0.064 U 0.064 U 0.064 U

NACHES 4/18/2007 3.1 U 0.063 U 0.063 U 0.063 U 0.063 U 0.063 U

MOXEE 4/18/2007 3 U 0.061 U 0.061 U 0.061 U 0.061 U 0.061 U

GRANGER 4/19/2007 3.1 U 0.063 U 0.063 U 0.063 U 0.063 U 0.063 U

SULFUR 4/19/2007 3.1 U 0.063 U 0.063 U 0.063 U 0.063 U 0.063 U

SPRING 4/19/2007 3.1 U 0.063 U 0.063 U 0.063 U 0.063 U 0.063 U

CHERRY 5/2/2007 3.1 UJ 0.062 UJ 0.062 UJ 0.062 UJ 0.062 UJ 0.062 UJ

WIPPLE 5/2/2007 3.1 UJ 0.063 U 0.063 U 0.063 U 0.063 U 0.063 U

HARRISON 5/2/2007 3.1 UJ 0.063 U 0.063 U 0.063 U 0.063 U 0.063 U

PARKER 5/2/2007 3.1 UJ 0.062 U 0.062 U 0.062 U 0.062 U 0.062 U

EUCLID 5/3/2007 3.1 UJ 0.062 U 0.062 U 0.062 U 0.062 U 0.062 U

KIONA 5/3/2007 3.1 UJ 0.063 U 0.063 U 0.063 U 0.063 U 0.063 U

NACHES 5/2/2007 3.1 UJ 0.063 U 0.063 U 0.063 U 0.063 U 0.063 U

MOXEE 5/2/2007 11 J 0.0625 U 0.0765 U 0.0625 U 0.0625 U 0.0625 U

MOXEE REP 5/2/2007 3.1 UJ 0.063 U 0.063 U 0.063 U 0.063 U 0.063 U

GRANGER 5/3/2007 3.1 UJ 0.063 U 0.063 U 0.063 U 0.063 U 0.063 U

SULFUR 5/3/2007 3.1 UJ 0.061 U 0.061 U 0.061 U 0.061 U 0.061 U

SPRING 5/3/2007 3.2 UJ 0.063 U 0.063 U 0.063 U 0.063 U 0.063 U

Toxaphene

CisChlordane CisNonachlorTransChlordane TransNonachlorOxychlordane

 U = not detected at or above reported value J = estimated na = not analyzed 
Yakima Pesticides/PCBs TMDL: Vol 1, WQ Study Findings 

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Collection 

Field ID Date (ng/L) (ng/L) (ng/L) (ng/L) (ng/L) (ng/L)

CHERRY 4/4/2007 0.063 U 0.063 U 0.063 U 0.063 U 0.39 UJ 0.083 UJ

WIPPLE 4/4/2007 0.065 U 0.065 U 0.065 U 0.065 U 0.29 UJ 0.065 U

HARRISON 4/4/2007 0.066 U 0.066 U 0.066 U 0.066 U 0.12 UJ 0.066 U

PARKER 4/4/2007 0.065 U 0.065 U 0.065 U 0.065 U 0.074 UJ 0.065 U

EUCLID 4/5/2007 0.064 U 0.087 UJ 0.064 U 0.064 U 0.32 U 0.32 U

KIONA 4/5/2007 0.063 U 0.07 UJ 0.063 U 0.063 U 0.29 UJ 0.063 U

NACHES 4/4/2007 0.064 U 0.064 U 0.064 U 0.064 U 0.064 U 0.064 U

MOXEE 4/4/2007 0.064 U 0.085 U 0.064 U 0.064 U 0.18 UJ 0.064 U

GRANGER 4/5/2007 0.064 U 0.101 UJ 0.064 U 0.064 U 0.20 UJ 0.064 U

GRANGER REP 4/5/2007 0.065 U 0.11 UJ 0.065 U 0.065 U 0.17 UJ 0.065 U

SULFUR 4/5/2007 0.065 U 0.065 U 0.065 U 0.065 U 0.21 UJ 0.065 U

SPRING 4/5/2007 0.065 U 0.065 U 0.065 U 0.065 U 0.44 UJ 0.065 U

TRNSFR BLNK 4/5/2007 0.063 U 0.063 U 0.063 U 0.063 U 0.063 U 0.063 U

CHERRY 4/18/2007 0.062 U 0.062 U 0.062 U 0.062 U 0.062 UJ 0.062 UJ

WIPPLE 4/18/2007 0.062 U 0.062 U 0.062 U 0.062 U 0.062 U 0.062 U

HARRISON 4/18/2007 0.063 U 0.063 U 0.063 U 0.063 U 0.063 U 0.063 U

PARKER 4/18/2007 0.063 U 0.063 U 0.063 U 0.063 U 0.063 U 0.063 U

EUCLID 4/19/2007 0.063 U 0.063 U 0.063 U 0.063 U 0.063 UJ 0.063 UJ

KIONA 4/19/2007 0.064 U 0.064 U 0.064 U 0.064 U 0.064 UJ 0.064 UJ

NACHES 4/18/2007 0.063 U 0.063 U 0.063 U 0.063 U 0.063 U 0.063 U

MOXEE 4/18/2007 0.061 U 0.061 U 0.061 U 0.061 U 0.061 U 0.061 U

GRANGER 4/19/2007 0.063 U 0.063 U 0.063 U 0.063 U 0.063 U 0.063 U

SULFUR 4/19/2007 0.063 U 0.063 U 0.063 U 0.063 U 0.1 J 0.063 U

SPRING 4/19/2007 0.063 U 0.063 U 0.063 U 0.063 U 0.063 UJ 0.063 UJ

CHERRY 5/2/2007 0.062 UJ 0.062 UJ 0.062 UJ 0.062 UJ 0.2 UJ 0.13 UJ

WIPPLE 5/2/2007 0.063 U 0.063 U 0.063 U 0.063 U 0.063 UJ 0.063 U

HARRISON 5/2/2007 0.063 U 0.063 U 0.063 U 0.063 U 0.063 UJ 0.063 U

PARKER 5/2/2007 0.062 U 0.062 U 0.062 U 0.062 U 0.062 UJ 0.062 U

EUCLID 5/3/2007 0.062 U 0.062 U 0.062 U 0.062 U 0.062 UJ 0.062 U

KIONA 5/3/2007 0.063 U 0.063 U 0.063 U 0.063 U 0.063 UJ 0.063 U

NACHES 5/2/2007 0.063 U 0.063 U 0.063 U 0.063 U 0.063 U 0.063 U

MOXEE 5/2/2007 0.0625 U 0.063 U 0.0625 U 0.063 U 0.063 UJ 0.063 U

MOXEE REP 5/2/2007 0.063 U 0.063 U 0.063 U 0.063 U 0.063 UJ 0.063 U

GRANGER 5/3/2007 0.063 U 0.063 U 0.063 U 0.063 U 0.063 UJ 0.063 U

SULFUR 5/3/2007 0.061 U 0.061 U 0.061 U 0.061 U 0.061 UJ 0.061 U

SPRING 5/3/2007 0.063 U 0.063 U 0.063 U 0.063 U 0.063 UJ 0.063 U

AlphaBHC Lindane Aldrin Endrin Beta-BHC Delta-BHC

U = not detected at or above reported value J = estimated na = not analyzed 
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Collection 

Field ID Date (ng/L) (ng/L) (ng/L) (ng/L) (ng/L)

CHERRY 4/4/2007 0.37 UJ 0.096 UJ 0.063 U 0.063 U 0.063 U

WIPPLE 4/4/2007 1.6 UJ 0.14 UJ 0.065 U 0.065 U 0.065 U

HARRISON 4/4/2007 0.16 UJ 0.079 UJ 0.066 U 0.087 UJ 0.066 U

PARKER 4/4/2007 0.11 UJ 0.065 UJ 0.065 U 0.074 UJ 0.065 U

EUCLID 4/5/2007 0.32 U 0.32 U 0.064 U 0.32 U 0.064 U

KIONA 4/5/2007 0.34 UJ 0.063 UJ 0.063 U 0.16 U 0.063 U

NACHES 4/4/2007 0.42 UJ 0.12 UJ 0.064 U 0.064 U 0.064 U

MOXEE 4/4/2007 0.42 UJ 0.064 UJ 0.064 U 0.12 0.064 U

GRANGER 4/5/2007 0.23 UJ 0.064 UJ 0.064 U 0.075 UJ 0.064 U

GRANGER REP 4/5/2007 0.17 UJ 0.065 UJ 0.065 U 0.071 UJ 0.065 U

SULFUR 4/5/2007 0.23 UJ 0.065 UJ 0.065 U 0.13 UJ 0.065 U

SPRING 4/5/2007 0.1 UJ 0.065 UJ 0.065 U 0.18 UJ 0.065 U

TRNSFR BLNK 4/5/2007 0.063 U 0.063 U 0.063 U 0.063 U 0.063 U

CHERRY 4/18/2007 0.062 UJ 0.062 UJ 0.062 U 0.062 UJ 0.062 U

WIPPLE 4/18/2007 0.062 U 0.062 U 0.062 U 0.062 U 0.062 U

HARRISON 4/18/2007 0.063 U 0.063 U 0.063 U 0.065 0.063 U

PARKER 4/18/2007 0.063 U 0.063 U 0.063 U 0.063 U 0.063 U

EUCLID 4/19/2007 0.063 UJ 0.063 UJ 0.063 U 0.1 J 0.063 U

KIONA 4/19/2007 0.064 UJ 0.064 UJ 0.064 U 0.064 UJ 0.064 U

NACHES 4/18/2007 0.063 U 0.25 UJ 0.063 U 0.063 U 0.063 U

MOXEE 4/18/2007 0.061 U 0.061 U 0.061 U 0.061 U 0.061 U

GRANGER 4/19/2007 0.063 U 0.063 U 0.063 U 0.18 UJ 0.063 U

SULFUR 4/19/2007 0.089 UJ 0.063 U 0.063 U 0.14 0.063 U

SPRING 4/19/2007 0.15 UJ 0.063 UJ 0.063 U 0.15 UJ 0.063 U

CHERRY 5/2/2007 0.42 UJ 0.065 UJ 0.062 UJ 0.1 UJ 0.062 UJ

WIPPLE 5/2/2007 0.084 UJ 0.065 UJ 0.063 U 0.063 U 0.063 U

HARRISON 5/2/2007 0.063 U 0.063 UJ 0.063 U 0.13 UJ 0.063 U

PARKER 5/2/2007 0.062 U 0.062 U 0.062 U 0.062 U 0.062 U

EUCLID 5/3/2007 0.062 U 0.062 U 0.062 U 0.077 UJ 0.062 U

KIONA 5/3/2007 0.063 U 0.063 U 0.063 U 0.18 UJ 0.063 U

NACHES 5/2/2007 0.063 U 0.063 U 0.063 U 0.14 UJ 0.063 U

MOXEE 5/2/2007 0.265 UJ 0.0625 U 0.0625 U 0.125 0.0625 U

MOXEE REP 5/2/2007 0.17 UJ 0.063 U 0.063 U 0.13 0.063 U

GRANGER 5/3/2007 0.094 UJ 0.063 U 0.063 U 0.11 UJ 0.063 U

SULFUR 5/3/2007 0.081 UJ 0.061 U 0.061 U 0.11 UJ 0.061 U

SPRING 5/3/2007 0.082 UJ 0.063 U 0.063 U 0.084 UJ 0.063 U

Endrin 

Aldehyde

Endrin 

Ketone Heptachlor

Heptachlor 

Epoxide

Hexachlorobenzene

U = not detected at or above reported value J = estimated na = not analyzed 
Yakima Pesticides/PCBs TMDL: Vol 1, WQ Study Findings 

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Collection 

Field ID Date (ng/L) (mg/L) (mg/L) (NTU) (umhos/cm)

CHERRY 4/4/2007 0.13 UJ 18 na 7.8 249

WIPPLE 4/4/2007 1.2 UJ 5 na 2.1 490

HARRISON 4/4/2007 0.43 UJ 16 13 7.8 114

PARKER 4/4/2007 0.065 UJ 15 12 9.4 102

EUCLID 4/5/2007 0.32 UJ 58 53 24 133

KIONA 4/5/2007 0.4 UJ 36 33 20 142

NACHES 4/4/2007 0.52 UJ 12 10 11 74.4

MOXEE 4/4/2007 0.064 UJ 85 na 17 199

GRANGER 4/5/2007 0.064 UJ 109 na 28 453

GRANGER REP 4/5/2007 0.065 UJ 96 26 454

SULFUR 4/5/2007 0.065 UJ 73 na 17 244

SPRING 4/5/2007 0.065 UJ 40 na 22 206

TRNSFR BLNK 4/5/2007 0.063 UJ na na na na

CHERRY 4/18/2007 0.062 UJ 23 na 11 252

WIPPLE 4/18/2007 0.062 UJ 31 na 15 252

HARRISON 4/18/2007 0.24 UJ 5 3 3.6 120

PARKER 4/18/2007 0.14 UJ 9 7 6.5 102

EUCLID 4/19/2007 0.19 UJ 19 17 8.5 145

KIONA 4/19/2007 0.064 UJ 16 14 8.8 153

NACHES 4/18/2007 0.37 UJ 8 8 7.7 74.4

MOXEE 4/18/2007 0.13 UJ 122 na 19 169

GRANGER 4/19/2007 0.063 UJ 180 na 42 395

SULFUR 4/19/2007 0.22 UJ 39 na 13 355

SPRING 4/19/2007 0.063 UJ 13 na 5.4 254

CHERRY 5/2/2007 0.062 U 121 107 36 301

WIPPLE 5/2/2007 0.063 U 140 125 29 261

HARRISON 5/2/2007 0.063 U 12 J 8 3.7 120

PARKER 5/2/2007 0.062 U 13 10 3.7 J 107

EUCLID 5/3/2007 0.062 U 18 15 7.6 148

KIONA 5/3/2007 0.063 U 14 11 5.9 155

NACHES 5/2/2007 0.063 U 7 6 4.4 71.2

MOXEE 5/2/2007 0.106 UJ 108 99.5 18 193

MOXEE REP 5/2/2007 0.15 UJ 105 95 21 193

GRANGER 5/3/2007 0.063 U 170 160 37 397

SULFUR 5/3/2007 0.061 U 38 34 13 290

SPRING 5/3/2007 0.063 U 16 13 6.2 283

Methoxychlor TSS TNVSS Turbidity Conductivity

U = not detected at or above reported value J = estimated na = not analyzed 
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Collection Flow 

Sample No. Field ID Date (cfs) (ng/L) (ng/L) (ng/L)

7214080 CHERRY 5/23/2007 541 0.1 0.24 0.063 U

7214081 WIPPLE 5/23/2007 156 0.13 0.67 0.063 U

7214082 HARRISON 5/23/2007 2,771 0.063 U 0.063 U 0.063 U

7214085 PARKER 5/23/2007 4,566 0.063 U 0.14 0.063 U

7214088 EUCLID 5/24/2007 4,865 0.066 0.33 0.064 U

7214090 KIONA 5/24/2007 5,267 0.062 U 0.38 0.075

7214083 NACHES 5/23/2007 3,191 0.063 U 0.12 0.063 U

7214084 MOXEE 5/23/2007 69 0.39 1.8 0.32

7214086 GRANGER 5/23/2007 29 0.89 4.1 0.42

7214087 SULFUR 5/24/2007 297 0.25 1.9 0.22

7214089 SPRING 5/24/2007 35 0.12 J 1.5 J 0.28 J

7234080 CHERRY 6/6/2007 459 0.063 U 0.23 0.063 U

7234081 WIPPLE 6/6/2007 144 0.25 J 0.98 0.063 U

7234082 HARRISON 6/6/2007 2,942 0.063 U 0.063 U 0.063 U

7234085 PARKER 6/6/2007 6,950 0.061 U 0.15 0.061 U

7234088 EUCLID 6/7/2007 6,516 0.2 J 0.51 0.062 U

7234090 KIONA 6/7/2007 6,961 0.44 J 0.55 0.063 U

7234083 NACHES 6/6/2007 4,728 0.063 U 0.14 J 0.063 U

7234084 MOXEE 6/6/2007 82 0.53 J 1.8 0.21 J

7234086 GRANGER 6/7/2007 34 1.7 J 3 0.22 J

7234087 SULFUR 6/7/2007 492 0.3 J 1.9 J 0.14 J

7234089 SPRING 6/7/2007 114 0.52 J 1.9 J 0.23 J

7234091 SPRING REP 6/7/2007 - - 0.7 J 1.6 0.26 J

7264080 CHERRY 6/27/2007 411 0.063 U 0.21 0.063 U

7264081 WIPPLE 6/27/2007 183 0.12 0.33 0.063 U

7264082 HARRISON 6/27/2007 1,364 0.062 U 0.062 U 0.062 U

7264085 PARKER 6/27/2007 266 0.061 U 0.097 0.061 U

7264088 EUCLID 6/28/2007 939 0.064 0.35 0.079

7264090 KIONA 6/28/2007 929 0.063 U 0.16 0.063 U

7264083 NACHES 6/27/2007 744 0.065 U 0.13 0.065 U

7264084 MOXEE 6/27/2007 55 0.23 1.3 0.23

7264086 GRANGER 6/28/2007 50 0.88 3.4 0.25

7264087 SULFUR 6/28/2007 254 0.26 1.5 0.16

7264089 SPRING 6/28/2007 51 0.15 0.66 0.19

4,4'-DDT 4,4'-DDE 4,4'-DDD

U = not detected at or above reported value J = estimated na = not analyzed
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Collection 

Field ID Date (ng/L) (ng/L) (ng/L) (ng/L) (ng/L)

CHERRY 5/23/2007 0.54 0.42 0.063 U 0.063 U 0.23

WIPPLE 5/23/2007 0.91 0.15 0.063 U 0.063 U 0.31

HARRISON 5/23/2007 0.063 U 0.063 U 0.063 U 0.063 U 0.097 UJ

PARKER 5/23/2007 0.063 U 0.17 J 0.22 0.095 0.32 J

EUCLID 5/24/2007 0.073 UJ 1.3 0.15 0.13 0.76 J

KIONA 5/24/2007 0.092 UJ 1.4 0.2 0.11 0.63 J

NACHES 5/23/2007 0.063 U 0.063 U 0.063 U 0.063 U 0.22 J

MOXEE 5/23/2007 0.078 UJ 0.98 0.19 0.3 1

GRANGER 5/23/2007 0.28 1.1 J 1 0.63 1.8

SULFUR 5/24/2007 0.37 1.2 0.12 0.26 0.88

SPRING 5/24/2007 0.23 2.4 0.16 0.29 2.7

CHERRY 6/6/2007 0.87 0.19 0.063 U 0.063 U 0.18 J

WIPPLE 6/6/2007 0.66 J 0.063 U 0.063 U 0.063 U 0.22 J

HARRISON 6/6/2007 0.089 UJ 0.063 U 0.063 U 0.063 U 0.093 J

PARKER 6/6/2007 0.075 UJ 0.061 U 0.075 UJ 0.062 0.22 UJ

EUCLID 6/7/2007 0.082 UJ 0.062 U 0.085 UJ 0.062 U 0.19 J

KIONA 6/7/2007 0.1 UJ 0.42 0.15 UJ 0.082 J 0.45 J

NACHES 6/6/2007 0.063 U 0.063 U 0.063 U 0.063 U 0.14 J

MOXEE 6/6/2007 0.092 UJ 0.5 0.16 UJ 0.28 0.82 J

GRANGER 6/7/2007 0.38 3.9 0.063 U 0.11 0.45 J

SULFUR 6/7/2007 0.28 0.44 J 0.066 UJ 0.19 0.58 J

SPRING 6/7/2007 0.31 1.1 0.35 J 0.27 J 1.6 J

SPRING REP 6/7/2007 0.34 1.3 0.41 J 0.34 J 1.7 J

CHERRY 6/27/2007 0.31 J 13 0.063 U 0.063 U 0.15 UJ

WIPPLE 6/27/2007 0.3 J 0.12 J 0.063 U 0.063 U 0.17 UJ

HARRISON 6/27/2007 0.062 U 0.062 U 0.062 U 0.062 U 0.12 UJ

PARKER 6/27/2007 0.061 U 0.13 J 0.061 U 0.061 U 0.13 UJ

EUCLID 6/28/2007 0.19 UJ 0.63 0.062 U 0.062 U 0.39

KIONA 6/28/2007 0.14 UJ 0.43 J 0.063 U 0.078 0.44

NACHES 6/27/2007 0.065 U 0.065 U 0.065 U 0.065 U 0.084 UJ

MOXEE 6/27/2007 0.11 UJ 0.43 0.41 0.62 1.2

GRANGER 6/28/2007 0.47 J 0.27 J 0.11 J 0.065 UJ 0.065 UJ

SULFUR 6/28/2007 0.41 J 0.28 0.082 J 0.13 J 0.46

SPRING 6/28/2007 0.15 UJ 0.82 0.093 J 0.1 0.91

Dieldrin

Endosulfan 

I

Endosulfan 

II

Endosulfan 

Chlorpyrifos Sulfate

 U = 

U = not detected at or above reported value J = estimated na = not analyzed
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Collection 

Field ID Date (ng/L) (ng/L) (ng/L) (ng/L) (ng/L) (ng/L)

CHERRY 5/23/2007 3.1 U 0.063 U 0.063 U 0.063 U 0.063 U 0.063 U

WIPPLE 5/23/2007 3.1 U 0.063 U 0.063 U 0.063 U 0.063 U 0.063 U

HARRISON 5/23/2007 3.2 U 0.063 U 0.063 U 0.063 U 0.063 U 0.063 U

PARKER 5/23/2007 3.1 U 0.063 U 0.063 U 0.063 U 0.063 U 0.063 U

EUCLID 5/24/2007 3.2 U 0.064 U 0.064 U 0.064 U 0.064 U 0.064 U

KIONA 5/24/2007 3.1 U 0.062 U 0.062 U 0.062 U 0.062 U 0.062 U

NACHES 5/23/2007 3.2 U 0.063 U 0.063 U 0.063 U 0.063 U 0.063 U

MOXEE 5/23/2007 3.5 E 0.063 U 0.063 U 0.063 U 0.063 U 0.063 U

GRANGER 5/23/2007 3.2 U 0.063 U 0.063 U 0.063 U 0.063 U 0.066 UJ

SULFUR 5/24/2007 4.3 E 0.062 U 0.062 U 0.062 U 0.062 U 0.062 U

SPRING 5/24/2007 3.2 UJ 0.063 UJ 0.063 UJ 0.063 UJ 0.063 UJ 0.063 UJ

CHERRY 6/6/2007 3.1 U 0.063 U 0.063 U 0.063 U 0.063 U 0.063 U

WIPPLE 6/6/2007 3.2 U 0.063 U 0.063 U 0.063 U 0.084 0.063 U

HARRISON 6/6/2007 3.1 U 0.063 U 0.063 U 0.063 U 0.063 U 0.063 U

PARKER 6/6/2007 3 U 0.061 U 0.061 U 0.061 U 0.061 U 0.061 U

EUCLID 6/7/2007 3.1 U 0.062 U 0.062 U 0.062 U 0.062 U 0.062 U

KIONA 6/7/2007 3.2 U 0.063 U 0.063 U 0.063 U 0.063 U 0.063 U

NACHES 6/6/2007 3.1 U 0.063 U 0.063 U 0.063 U 0.063 U 0.063 U

MOXEE 6/6/2007 3.2 U 0.063 U 0.063 U 0.063 U 0.063 U 0.063 U

GRANGER 6/7/2007 3.1 U 0.063 U 0.063 U 0.063 U 0.063 U 0.063 U

SULFUR 6/7/2007 3.2 U 0.064 U 0.064 U 0.064 U 0.064 U 0.064 U

SPRING 6/7/2007 3.2 U 0.063 U 0.063 U 0.063 U 0.063 U 0.063 U

SPRING REP 6/7/2007 3.2 U 0.063 U 0.063 U 0.1 0.063 U 0.063 U

CHERRY 6/27/2007 3.2 U 0.063 U 0.063 U 0.063 U 0.063 U 0.063 U

WIPPLE 6/27/2007 3.2 U 0.063 U 0.063 U 0.063 U 0.063 U 0.063 U

HARRISON 6/27/2007 3.1 U 0.062 U 0.062 U 0.062 U 0.062 U 0.062 U

PARKER 6/27/2007 3.1 U 0.061 U 0.061 U 0.061 U 0.061 U 0.061 U

EUCLID 6/28/2007 3.1 U 0.062 U 0.062 U 0.062 U 0.062 U 0.062 U

KIONA 6/28/2007 3.1 U 0.063 U 0.063 U 0.063 U 0.063 U 0.063 U

NACHES 6/27/2007 3.3 U 0.065 U 0.065 U 0.065 U 0.065 U 0.065 U

MOXEE 6/27/2007 3.1 U 0.063 U 0.063 U 0.063 U 0.063 U 0.063 U

GRANGER 6/28/2007 3.3 U 0.065 U 0.065 U 0.065 U 0.065 U 0.065 U

SULFUR 6/28/2007 3.3 U 0.065 U 0.065 U 0.065 U 0.065 U 0.065 U

SPRING 6/28/2007 3.2 U 0.063 U 0.063 U 0.063 U 0.063 U 0.063 U

OxychlordaneTransNonachlorTransChlordane CisNonachlorCisToxaphene Chlordane 

U = not detected at or above reported value J = estimated na = not analyzed
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Collection 

Field ID Date (ng/L) (ng/L) (ng/L) (ng/L) (ng/L) (ng/L)

CHERRY 5/23/2007 0.063 U 0.063 U 0.063 U 0.063 U 0.088 UJ 0.063 U

WIPPLE 5/23/2007 0.063 U 0.063 U 0.063 U 0.11 UJ 0.063 U 0.063 U

HARRISON 5/23/2007 0.063 U 0.063 U 0.063 U 0.063 U 0.063 U 0.063 U

PARKER 5/23/2007 0.063 U 0.063 U 0.063 U 0.063 U 0.063 U 0.063 U

EUCLID 5/24/2007 0.064 U 0.064 U 0.064 U 0.064 U 0.064 U 0.064 U

KIONA 5/24/2007 0.062 U 0.062 U 0.062 U 0.062 U 0.062 U 0.062 U

NACHES 5/23/2007 0.063 U 0.063 U 0.063 U 0.063 U 0.063 U 0.063 U

MOXEE 5/23/2007 0.063 U 0.063 U 0.063 U 0.063 U 0.063 U 0.063 U

GRANGER 5/23/2007 0.063 U 0.063 U 0.063 U 0.063 U 0.063 U 0.063 U

SULFUR 5/24/2007 0.062 U 0.062 U 0.062 U 0.062 U 0.062 U 0.062 U

SPRING 5/24/2007 0.063 UJ 0.087 UJ 0.063 UJ 0.063 UJ 0.063 U 0.095 UJ

CHERRY 6/6/2007 0.063 U 0.063 U 0.063 U 0.063 UJ 0.063 U 0.063 U

WIPPLE 6/6/2007 0.063 U 0.063 U 0.063 U 0.063 UJ 0.063 U 0.063 U

HARRISON 6/6/2007 0.063 U 0.063 U 0.063 U 0.063 UJ 0.063 U 0.063 U

PARKER 6/6/2007 0.061 U 0.061 U 0.061 U 0.061 UJ 0.061 U 0.061 U

EUCLID 6/7/2007 0.062 U 0.062 U 0.062 U 0.062 UJ 0.062 U 0.062 U

KIONA 6/7/2007 0.063 U 0.063 U 0.063 U 0.063 UJ 0.063 U 0.063 U

NACHES 6/6/2007 0.063 U 0.063 U 0.063 U 0.063 UJ 0.063 U 0.063 U

MOXEE 6/6/2007 0.063 U 0.063 U 0.063 U 0.097 UJ 0.063 U 0.063 U

GRANGER 6/7/2007 0.063 U 0.063 U 0.063 U 0.063 UJ 0.063 U 0.063 U

SULFUR 6/7/2007 0.064 U 0.064 U 0.064 U 0.069 UJ 0.064 U 0.064 U

SPRING 6/7/2007 0.063 U 0.063 U 0.063 U 0.063 UJ 0.063 U 0.063 U

SPRING REP 6/7/2007 0.063 U 0.063 U 0.063 U 0.063 UJ 0.063 U 0.063 U

CHERRY 6/27/2007 0.063 U 0.11 UJ 0.063 U 0.063 U 0.063 U 0.063 U

WIPPLE 6/27/2007 0.063 U 0.14 UJ 0.063 U 0.063 U 0.063 U 0.063 U

HARRISON 6/27/2007 0.062 U 0.15 UJ 0.062 U 0.062 U 0.062 U 0.062 U

PARKER 6/27/2007 0.061 U 0.14 UJ 0.061 U 0.061 U 0.061 U 0.061 U

EUCLID 6/28/2007 0.062 U 0.062 U 0.062 U 0.062 U 0.062 U 0.062 U

KIONA 6/28/2007 0.063 U 0.11 UJ 0.063 U 0.063 U 0.063 U 0.063 U

NACHES 6/27/2007 0.065 U 0.1 UJ 0.065 U 0.065 U 0.065 UJ 0.065 U

MOXEE 6/27/2007 0.063 U 0.12 UJ 0.063 U 0.071 UJ 0.063 U 0.063 U

GRANGER 6/28/2007 0.065 U 0.065 U 0.065 U 0.065 U 0.065 UJ 0.065 UJ

SULFUR 6/28/2007 0.065 U 0.065 U 0.065 U 0.065 U 0.065 U 0.065 U

SPRING 6/28/2007 0.063 U 0.14 UJ 0.063 U 0.063 U 0.063 U 0.063 U

AlphaBHC Lindane Aldrin Endrin Beta-BHC Delta-BHC

U = not detected at or above reported value J = estimated na = not analyzed
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Collection 

Field ID Date (ng/L) (ng/L) (ng/L) (ng/L) (ng/L)

CHERRY 5/23/2007 0.063 U 0.063 U 0.063 U 0.063 U 0.063 U

WIPPLE 5/23/2007 0.067 UJ 0.063 U 0.063 U 0.063 U 0.063 U

HARRISON 5/23/2007 0.063 U 0.063 U 0.063 U 0.063 U 0.063 U

PARKER 5/23/2007 0.063 U 0.063 U 0.063 U 0.11 0.063 U

EUCLID 5/24/2007 0.16 UJ 0.19 UJ 0.064 U 0.072 UJ 0.064 U

KIONA 5/24/2007 0.062 U 0.062 U 0.062 U 0.062 U 0.062 U

NACHES 5/23/2007 0.063 U 0.063 U 0.063 U 0.12 0.063 U

MOXEE 5/23/2007 0.092 UJ 0.063 U 0.063 U 0.063 U 0.063 U

GRANGER 5/23/2007 0.063 U 0.063 U 0.063 U 0.077 UJ 0.063 U

SULFUR 5/24/2007 0.073 UJ 0.062 U 0.062 U 0.077 UJ 0.062 U

SPRING 5/24/2007 0.11 UJ 0.063 U 0.063 UJ 0.063 U 0.12 J

CHERRY 6/6/2007 0.12 UJ 0.063 U 0.063 U 0.063 U 0.063 U

WIPPLE 6/6/2007 0.076 UJ 0.063 U 0.063 U 0.066 0.063 U

HARRISON 6/6/2007 0.063 U 0.063 U 0.063 U 0.063 U 0.063 U

PARKER 6/6/2007 0.13 UJ 0.061 U 0.061 U 0.061 U 0.061 U

EUCLID 6/7/2007 0.062 UJ 0.062 U 0.062 U 0.062 U 0.062 U

KIONA 6/7/2007 0.063 U 0.063 U 0.063 U 0.11 UJ 0.063 U

NACHES 6/6/2007 0.13 UJ 0.063 U 0.063 U 0.063 U 0.063 U

MOXEE 6/6/2007 0.48 UJ 0.063 U 0.063 U 0.063 U 0.063 U

GRANGER 6/7/2007 0.1 UJ 0.063 U 0.063 U 0.17 0.063 U

SULFUR 6/7/2007 0.083 UJ 0.064 U 0.064 U 1.3 0.064 U

SPRING 6/7/2007 0.077 UJ 0.063 U 0.063 U 0.1 UJ 0.063 U

SPRING REP 6/7/2007 0.14 UJ 0.063 U 0.063 U 0.11 UJ 0.063 U

CHERRY 6/27/2007 0.063 U 0.063 U 0.063 U 0.063 U 0.072 UJ

WIPPLE 6/27/2007 0.063 U 0.063 U 0.063 U 0.063 U 0.063 U

HARRISON 6/27/2007 0.062 U 0.062 U 0.062 U 0.062 U 0.062 U

PARKER 6/27/2007 0.061 U 0.061 U 0.061 U 0.061 U 0.061 U

EUCLID 6/28/2007 0.062 U 0.062 U 0.062 U 0.062 U 0.062 U

KIONA 6/28/2007 0.063 U 0.063 U 0.063 U 0.063 U 0.063 U

NACHES 6/27/2007 0.065 U 0.065 U 0.065 U 0.065 U 0.065 UJ

MOXEE 6/27/2007 0.063 U 0.063 U 0.063 U 0.063 U 0.063 U

GRANGER 6/28/2007 0.065 UJ 0.065 UJ 0.065 U 0.12 J 0.065 U

SULFUR 6/28/2007 0.065 U 0.065 U 0.065 U 0.065 U 0.065 U

SPRING 6/28/2007 0.063 U 0.063 U 0.063 U 0.063 U 0.063 U

Endrin 

Aldehyde

Endrin 

Ketone Heptachlor

Heptachlor 

Epoxide

Hexachlorobenzene

U = not detected at or above reported value J = estimated na = not analyzed
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Collection Methoxychlor

Field ID Date (ng/L) (mg/L) (mg/L) (NTU) (umhos/cm)

CHERRY 5/23/2007 0.063 UJ 58 50 17 258

WIPPLE 5/23/2007 0.077 UJ 52 45 19 228

HARRISON 5/23/2007 0.16 UJ 16 13 5.5 98

PARKER 5/23/2007 0.063 UJ 16 14 5.7 90

EUCLID 5/24/2007 0.064 UJ 38 34 15 126

KIONA 5/24/2007 0.062 UJ 43 38 16 135

NACHES 5/23/2007 0.063 UJ 8 7 6.6 64

MOXEE 5/23/2007 0.18 UJ 125 117 23 221

GRANGER 5/23/2007 0.063 UJ 133 123 39 392

SULFUR 5/24/2007 0.062 UJ 73 66 18 241

SPRING 5/24/2007 0.063 UJ 218 195 50 299

CHERRY 6/6/2007 0.063 U 67 58 22 271

WIPPLE 6/6/2007 0.063 U 63 56 24 262

HARRISON 6/6/2007 0.084 UJ 24 20 12 87

PARKER 6/6/2007 0.061 U 27 23 17 77

EUCLID 6/7/2007 0.062 U 67 61 27 105

KIONA 6/7/2007 0.063 U 76 68 32 109

NACHES 6/6/2007 0.063 U 29 26 17 56

MOXEE 6/6/2007 0.19 UJ 139 129 33 177

GRANGER 6/7/2007 0.063 U 132 122 60 331

SULFUR 6/7/2007 0.064 U 80 74 25 181

SPRING 6/7/2007 0.063 U 92 83 34 153

SPRING REP 6/7/2007 0.063 U 100 90 32 153

CHERRY 6/27/2007 0.1 UJ 44 38 13 244

WIPPLE 6/27/2007 0.063 U 35 31 14 164

HARRISON 6/27/2007 0.062 U 9 7 4.2 90.2

PARKER 6/27/2007 0.061 U 7 6 2.9 94.9

EUCLID 6/28/2007 0.062 U 16 13 5.3 236

KIONA 6/28/2007 0.22 UJ 14 11 4.2 264

NACHES 6/27/2007 0.065 U 4 3 3.8 72.2

MOXEE 6/27/2007 0.063 U 61 57 16 212

GRANGER 6/28/2007 0.17 UJ 33 30 17 374

SULFUR 6/28/2007 0.065 U 26 24 9.4 287

SPRING 6/28/2007 0.063 U 22 20 6 230

TSS Turbidity TNVSS Conductivity

U = not detected at or above reported value J = estimated na = not analyzed
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Collection Flow 

Sample No. Field ID Date (cfs) (ng/L) (ng/L) (ng/L)

7284080 CHERRY 7/11/2007 142 0.3 0.33 0.063 U

7284081 WIPPLE 7/11/2007 61 0.27 0.5 0.061 U

7284082 HARRISON 7/11/2007 2,211 0.063 U 0.063 U 0.063 U

7284085 PARKER 7/11/2007 384 0.066 U 0.096 0.066 U

7284088 EUCLID 7/12/2007 875 0.19 UJ 0.4 0.11 UJ

7284091 EUCLID REP 7/12/2007 - - 0.14 UJ 0.46 0.11 UJ

7284090 KIONA 7/12/2007 846 0.063 U 0.16 0.067 UJ

7284083 NACHES 7/11/2007 364 0.061 UJ 0.14 0.063 UJ

7284084 MOXEE 7/11/2007 38 0.21 UJ 0.76 0.19

7284086 GRANGER 7/12/2007 42 0.98 J 2.7 J 0.22 J

7284087 SULFUR 7/12/2007 181 0.27 1.1 0.17

7284089 SPRING 7/12/2007 22 0.065 U 0.37 0.13 UJ

7284092 TRNSFR BLNK 7/11/2007 - - 0.061 U 0.061 U 0.061 U

7304082 HARRISON 7/24/2007 2,138 0.063 U 0.063 U 0.063 U

7304085 PARKER 7/24/2007 384 0.062 U 0.074 J 0.062 U

7304088 EUCLID 7/24/2007 978 0.095 0.35 0.093

7304090 KIONA 7/26/2007 1,101 0.063 U 0.14 0.063 U

7304083 NACHES 7/24/2007 299 0.063 U 0.17 0.063 U

7304084 MOXEE 7/24/2007 43 0.31 0.98 0.24

7304086 GRANGER 7/24/2007 40 0.69 2.2 0.23

7304087 SULFUR 7/24/2007 235 0.24 0.96 0.18

7304089 SPRING 7/24/2007 24 0.063 U 0.38 0.15

7324080 CHERRY 8/8/2007 249 0.44 0.26 0.061 U

7324081 WIPPLE 8/8/2007 98 0.099 0.54 0.062 U

7324082 HARRISON 8/8/2007 2,242 0.063 U 0.063 U 0.063 U

7324085 PARKER 8/9/2007 500 0.066 U 0.083 0.066 U

7324088 EUCLID 8/9/2007 1,007 0.11 0.44 0.11

7324090 KIONA 8/9/2007 1,681 0.062 U 0.14 0.062 U

7324083 NACHES 8/8/2007 334 0.07 0.18 0.068

7324084 MOXEE 8/8/2007 45 0.24 1 0.2

7324086 GRANGER 8/9/2007 49 0.66 2.4 0.27

7324091 SULFUR REP 8/9/2007 288 0.35 1.2 0.15

7324089 SPRING 8/9/2007 43 0.074 0.4 0.15

4,4'-DDT 4,4'-DDE 4,4'-DDD

U = not detected at or above reported value J = estimated na = not analyzed
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Collection Dieldrin

Field ID Date (ng/L) (ng/L) (ng/L) (ng/L) (ng/L)

CHERRY 7/11/2007 2.1 0.011 J 0.063 U 0.063 U 0.21

WIPPLE 7/11/2007 1.5 0.061 U 0.061 U 0.061 U 0.16

HARRISON 7/11/2007 0.067 UJ 0.063 U 0.063 U 0.063 U 0.11

PARKER 7/11/2007 0.087 UJ 0.089 J 0.066 U 0.066 U 0.19

EUCLID 7/12/2007 0.25 J 1.1 0.17 J 0.095 J 0.72

EUCLID REP 7/12/2007 0.25 J 1.4 0.21 J 0.14 0.68

KIONA 7/12/2007 0.15 J 0.49 0.074 J 0.063 U 0.61

NACHES 7/11/2007 0.061 U 0.074 J 0.061 U 0.061 U 0.11

MOXEE 7/11/2007 0.063 U 0.31 0.063 U 0.18 0.44

GRANGER 7/12/2007 0.65 J 0.22 J 0.3 J 0.19 J 0.49 J

SULFUR 7/12/2007 0.92 J 0.61 J 0.3 J 0.28 0.78

SPRING 7/12/2007 0.17 J 0.64 0.27 J 0.17 J 0.89

TRNSFR BLNK 7/11/2007 0.061 U 0.061 U 0.061 U 0.061 U 0.061 U

HARRISON 7/24/2007 0.063 U 0.063 U 0.063 U 0.063 U 0.28

PARKER 7/24/2007 0.062 U 0.11 J 0.062 U 0.062 U 0.2 J

EUCLID 7/24/2007 0.22 J 20 0.12 UJ 0.096 0.76

KIONA 7/26/2007 0.22 J 13 0.16 UJ 0.12 1.2

NACHES 7/24/2007 0.063 U 0.063 U 0.07 UJ 0.063 U 0.15 J

MOXEE 7/24/2007 0.067 UJ 0.24 0.093 UJ 0.1 J 0.58

GRANGER 7/24/2007 0.38 0.56 J 0.15 UJ 0.083 J 0.6

SULFUR 7/24/2007 0.59 0.6 J 0.31 UJ 0.14 0.78

SPRING 7/24/2007 0.19 J 0.79 J 0.33 UJ 0.26 J 2.8

CHERRY 8/8/2007 1 0.23 0.061 U 0.061 U 0.18

WIPPLE 8/8/2007 0.68 0.062 U 0.062 U 0.062 U 0.15 J

HARRISON 8/8/2007 0.063 U 0.063 U 0.08 0.063 U 0.13 J

PARKER 8/9/2007 0.066 U 0.066 U 0.2 0.073 0.29

EUCLID 8/9/2007 0.29 6.2 0.35 0.18 0.76

KIONA 8/9/2007 0.15 J 2.5 0.094 J 0.08 J 0.82

NACHES 8/8/2007 0.063 U 0.063 U 0.37 0.063 U 0.18 J

MOXEE 8/8/2007 0.068 J 0.063 U 0.21 J 0.15 J 0.66

GRANGER 8/9/2007 0.52 0.88 0.44 J 0.14 J 0.93

SULFUR REP 8/9/2007 0.6 1.2 0.65 0.29 0.95

SPRING 8/9/2007 0.17 J 3.5 0.33 0.25 J 2.7

Chlorpyrifos

Endosulfan 

I

Endosulfan 

II

Endosulfan 

Sulfate

U = not detected at or above reported value J = estimated na = not analyzed
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Collection 

Field ID Date (ng/L) (ng/L) (ng/L) (ng/L) (ng/L) (ng/L)

CHERRY 7/11/2007 3.2 U 0.063 U 0.063 U 0.063 U 0.063 U 0.063 U

WIPPLE 7/11/2007 3.1 U 0.061 U 0.061 U 0.061 U 0.061 U 0.11 UJ

HARRISON 7/11/2007 3.1 U 0.063 U 0.063 U 0.063 U 0.063 U 0.063 U

PARKER 7/11/2007 3.3 U 0.066 U 0.066 U 0.066 U 0.066 U 0.12 UJ

EUCLID 7/12/2007 3.1 U 0.063 U 0.063 U 0.085 UJ 0.063 U 0.16 UJ

EUCLID REP 7/12/2007 3.3 U 0.066 U 0.066 U 0.066 U 0.066 U 0.066 U

KIONA 7/12/2007 3.1 U 0.063 U 0.063 U 0.063 U 0.063 U 0.063 U

NACHES 7/11/2007 3.1 U 0.061 U 0.061 U 0.061 U 0.061 U 0.061 U

MOXEE 7/11/2007 3.2 U 0.063 U 0.063 U 0.063 UJ 0.063 U 0.063 U

GRANGER 7/12/2007 3 UJ 0.061 UJ 0.061 UJ 0.061 U 0.061 UJ 0.13 UJ

SULFUR 7/12/2007 3.2 U 0.064 U 0.064 U 0.064 U 0.064 U 0.094 UJ

SPRING 7/12/2007 3.2 U 0.065 U 0.065 U 0.065 U 0.065 U 0.11 UJ

TRNSFR BLNK 7/11/2007 0.061 U 0.061 U 0.061 U 0.061 U 0.065 U 0.061 U

HARRISON 7/24/2007 3.2 U 0.063 U 0.063 U 0.063 U 0.063 U 0.063 U

PARKER 7/24/2007 3.1 U 0.062 U 0.062 U 0.062 U 0.062 U 0.062 U

EUCLID 7/24/2007 3.3 U 0.065 U 0.065 U 0.065 U 0.065 U 0.065 U

KIONA 7/26/2007 3.1 U 0.063 U 0.063 U 0.063 U 0.063 U 0.063 U

NACHES 7/24/2007 3.2 U 0.063 U 0.063 U 0.063 U 0.063 U 0.063 U

MOXEE 7/24/2007 3.1 U 0.061 U 0.061 U 0.061 U 0.061 U 0.061 U

GRANGER 7/24/2007 3.2 U 0.063 U 0.063 U 0.063 U 0.063 U 0.063 U

SULFUR 7/24/2007 4.1 J 0.063 U 0.063 U 0.063 U 0.063 U 0.063 U

SPRING 7/24/2007 3.1 U 0.063 U 0.063 U 0.063 U 0.063 U 0.063 U

CHERRY 8/8/2007 3 U 0.061 U 0.061 U 0.061 U 0.061 U 0.061 U

WIPPLE 8/8/2007 3.1 U 0.062 U 0.062 U 0.062 U 0.062 U 0.062 U

HARRISON 8/8/2007 3.1 U 0.063 U 0.063 U 0.063 U 0.063 U 0.063 U

PARKER 8/9/2007 3.3 U 0.066 U 0.066 U 0.066 U 0.066 U 0.066 U

EUCLID 8/9/2007 3.1 U 0.062 U 0.062 U 0.062 U 0.062 U 0.062 U

KIONA 8/9/2007 3.1 U 0.062 U 0.062 U 0.062 U 0.062 U 0.062 U

NACHES 8/8/2007 3.1 U 0.063 U 0.063 U 0.063 U 0.063 U 0.063 U

MOXEE 8/8/2007 3.1 U 0.063 U 0.063 U 0.063 U 0.063 U 0.063 U

GRANGER 8/9/2007 3.3 U 0.066 U 0.066 U 0.066 U 0.066 U 0.066 U

SULFUR REP 8/9/2007 3.1 U 0.062 U 0.062 U 0.062 U 0.062 U 0.062 U

SPRING 8/9/2007 3.1 U 0.063 U 0.063 U 0.063 U 0.063 U 0.063 U

CisChlordane CisNonachlorTransChlordane TransNonachlorOxyToxaphene chlordane

 U = not detected at or above reported value J = estimated na = not analyzed 
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Collection 

Field ID Date (ng/L) (ng/L) (ng/L) (ng/L) (ng/L) (ng/L)

CHERRY 7/11/2007 0.063 U 0.063 U 0.063 U 0.063 U 0.063 U 0.063 U

WIPPLE 7/11/2007 0.061 U 0.061 U 0.061 U 0.092 UJ 0.061 U 0.061 U

HARRISON 7/11/2007 0.063 U 0.063 U 0.063 U 0.063 U 0.063 U 0.063 U

PARKER 7/11/2007 0.066 U 0.066 U 0.066 U 0.066 U 0.066 U 0.066 U

EUCLID 7/12/2007 0.063 U 0.063 U 0.063 U 0.063 U 0.063 U 0.19 UJ

EUCLID REP 7/12/2007 0.066 U 0.066 U 0.066 U 0.066 U 0.066 U 0.15 UJ

KIONA 7/12/2007 0.063 U 0.063 U 0.063 U 0.063 U 0.063 U 0.075 UJ

NACHES 7/11/2007 0.061 U 0.061 U 0.061 U 0.061 U 0.061 U 0.061 U

MOXEE 7/11/2007 0.063 U 0.063 U 0.063 U 0.075 UJ 0.063 U 0.063 U

GRANGER 7/12/2007 0.061 UJ 0.061 U 0.061 UJ 0.061 UJ 0.061 UJ 0.16 UJ

SULFUR 7/12/2007 0.064 U 0.064 U 0.064 U 0.064 U 0.064 U 0.22 UJ

SPRING 7/12/2007 0.065 U 0.12 UJ 0.065 U 0.065 U 0.065 U 0.065 U

TRNSFR BLNK 7/11/2007 0.061 U 0.061 U 0.061 U 0.061 U 0.061 U 0.061 U

HARRISON 7/24/2007 0.063 U 0.063 U 0.063 U 0.063 U 0.063 U 0.063 U

PARKER 7/24/2007 0.062 U 0.062 U 0.062 U 0.062 U 0.062 U 0.062 U

EUCLID 7/24/2007 0.065 U 0.065 U 0.065 U 0.065 U 0.085 UJ 0.065 U

KIONA 7/26/2007 0.063 U 0.063 U 0.063 U 0.063 U 0.065 UJ 0.11 UJ

NACHES 7/24/2007 0.063 U 0.063 U 0.063 U 0.063 U 0.063 U 0.063 U

MOXEE 7/24/2007 0.061 U 0.061 U 0.061 U 0.061 U 0.061 U 0.076 UJ

GRANGER 7/24/2007 0.063 U 0.063 U 0.063 U 0.063 U 0.063 U 0.063 U

SULFUR 7/24/2007 0.063 U 0.063 U 0.063 U 0.063 U 0.063 U 0.063 U

SPRING 7/24/2007 0.063 U 0.063 U 0.063 U 0.063 U 0.063 U 0.063 U

CHERRY 8/8/2007 0.069 0.061 U 0.061 U 0.061 U 0.061 U 0.061 U

WIPPLE 8/8/2007 0.062 U 0.062 U 0.062 U 0.062 U 0.062 U 0.062 U

HARRISON 8/8/2007 0.063 U 0.063 U 0.063 U 0.063 U 0.063 U 0.063 U

PARKER 8/9/2007 0.066 U 0.066 U 0.066 U 0.066 U 0.066 U 0.066 U

EUCLID 8/9/2007 0.062 U 0.062 U 0.062 U 0.062 U 0.062 U 0.062 U

KIONA 8/9/2007 0.062 U 0.062 U 0.062 U 0.062 U 0.062 U 0.12

NACHES 8/8/2007 0.063 U 0.063 U 0.063 U 0.063 U 0.063 U 0.063 U

MOXEE 8/8/2007 0.063 U 0.063 U 0.063 U 0.063 U 0.063 U 0.063 U

GRANGER 8/9/2007 0.066 U 0.066 U 0.066 U 0.066 U 0.066 U 0.066 U

SULFUR REP 8/9/2007 0.062 U 0.062 U 0.062 U 0.062 U 0.062 U 0.062 U

SPRING 8/9/2007 0.063 U 0.063 U 0.063 U 0.063 U 0.063 U 0.063 U

AlphaBHC Beta-BHCDeltaBHC Lindane Aldrin Endrin

U = not detected at or above reported value J = estimated na = not analyzed
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Collection 

Field ID Date (ng/L) (ng/L) (ng/L) (ng/L) (ng/L)

CHERRY 7/11/2007 0.063 U 0.063 U 0.063 U 0.064 UJ 0.063 U

WIPPLE 7/11/2007 0.061 U 0.061 U 0.061 U 0.061 U 0.061 U

HARRISON 7/11/2007 0.063 U 0.063 U 0.063 U 0.063 U 0.063 U

PARKER 7/11/2007 0.066 U 0.066 U 0.066 U 0.066 U 0.066 U

EUCLID 7/12/2007 0.063 U 0.063 U 0.063 U 0.063 U 0.063 U

EUCLID REP 7/12/2007 0.066 U 0.066 U 0.066 U 0.066 U 0.066 U

KIONA 7/12/2007 0.063 U 0.063 U 0.063 U 0.063 U 0.063 U

NACHES 7/11/2007 0.061 U 0.061 U 0.061 U 0.061 U 0.061 U

MOXEE 7/11/2007 0.063 U 0.063 U 0.063 U 0.063 U 0.063 U

GRANGER 7/12/2007 0.061 UJ 0.061 UJ 0.061 UJ 0.15 J 0.061 UJ

SULFUR 7/12/2007 0.064 U 0.064 U 0.064 U 0.16 J 0.064 U

SPRING 7/12/2007 0.065 U 0.065 U 0.065 U 0.065 U 0.065 U

TRNSFR BLNK 7/11/2007 0.061 U 0.061 U 0.061 U 0.061 U 0.061 U

HARRISON 7/24/2007 0.063 U 0.063 U 0.063 U 0.063 U 0.063 U

PARKER 7/24/2007 0.062 U 0.062 U 0.062 U 0.062 U 0.062 U

EUCLID 7/24/2007 0.065 U 0.065 U 0.065 U 0.065 U 0.065 U

KIONA 7/26/2007 0.063 U 0.23 UJ 0.063 U 0.063 U 0.063 U

NACHES 7/24/2007 0.063 U 0.063 U 0.063 U 0.07 UJ 0.063 U

MOXEE 7/24/2007 0.061 U 0.061 U 0.061 U 0.061 U 0.061 U

GRANGER 7/24/2007 0.063 U 0.063 U 0.063 U 0.14 UJ 0.063 U

SULFUR 7/24/2007 0.073 UJ 0.063 U 0.063 U 0.063 U 0.063 U

SPRING 7/24/2007 0.063 U 0.063 U 0.063 U 0.063 U 0.063 U

CHERRY 8/8/2007 0.061 U 0.061 U 0.061 U 0.061 U 0.061 U

WIPPLE 8/8/2007 0.062 U 0.062 U 0.062 U 0.062 U 0.062 U

HARRISON 8/8/2007 0.063 U 0.063 U 0.063 U 0.063 U 0.063 U

PARKER 8/9/2007 0.066 U 0.066 U 0.066 U 0.066 U 0.066 U

EUCLID 8/9/2007 0.069 UJ 0.062 U 0.062 U 0.062 U 0.062 U

KIONA 8/9/2007 0.062 U 0.062 U 0.062 U 0.062 U 0.062 U

NACHES 8/8/2007 0.063 U 0.063 U 0.063 U 0.063 U 0.063 U

MOXEE 8/8/2007 0.063 U 0.063 U 0.063 U 0.063 U 0.063 U

GRANGER 8/9/2007 0.066 U 0.066 U 0.066 U 0.12 0.066 U

SULFUR REP 8/9/2007 0.062 U 0.062 U 0.062 U 0.07 J 0.062 U

SPRING 8/9/2007 0.063 U 0.063 U 0.063 U 0.063 U 0.063 U

Endrin 

Aldehyde

Endrin 

Ketone Heptachlor

Heptachlor 

Epoxide

Hexachlorobenzene

U = not detected at or above reported value J = estimated na = not analyzed
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Collection 

Field ID Date (ng/L) (mg/L) (mg/L) (NTU) (umhos/cm)

CHERRY 7/11/2007 0.063 U 37 32 16 389

WIPPLE 7/11/2007 0.28 UJ 34 31 11 392

HARRISON 7/11/2007 0.063 U 17 14 6.7 77.4

PARKER 7/11/2007 0.066 U 12 10 5.2 88.7

EUCLID 7/12/2007 0.063 U 11 8 5.8 252

EUCLID REP 7/12/2007 0.066 U 14 12 6.9 252

KIONA 7/12/2007 0.61 UJ 7 6 4.1 273

NACHES 7/11/2007 0.061 U 4 3 3.8 82.5

MOXEE 7/11/2007 0.13 UJ 61 56 15 230

GRANGER 7/12/2007 0.061 U 20 18 12 372

SULFUR 7/12/2007 0.064 U 9 8 3.9 361

SPRING 7/12/2007 0.065 U 9 7 3.6 368

TRNSFR BLNK 7/11/2007 0.061 U 3.1 na na na

HARRISON 7/24/2007 0.063 U 13 11 6.5 87.3

PARKER 7/24/2007 0.062 U 10 8 4.7 98.3

EUCLID 7/24/2007 0.065 U 14 12 7.6 236

KIONA 7/26/2007 0.26 UJ 8 6 4.2 266

NACHES 7/24/2007 0.063 U 5 3 3.2 92

MOXEE 7/24/2007 0.079 UJ 44 40 13 230

GRANGER 7/24/2007 0.063 U 13 12 8.7 391

SULFUR 7/24/2007 0.063 U 9 J 7 4.3 321

SPRING 7/24/2007 0.063 U 8 6 3.3 331

CHERRY 8/8/2007 0.061 U 47 41 18 343

WIPPLE 8/8/2007 0.062 U 49 42 21 350

HARRISON 8/8/2007 0.063 U 10 8 4.1 83.7

PARKER 8/9/2007 0.066 U 10 8 5.6 97.3

EUCLID 8/9/2007 0.062 U 11 9 6.2 240

KIONA 8/9/2007 0.25 UJ 7 6 3.5 258

NACHES 8/8/2007 0.063 U 5 5 4.8 89.7

MOXEE 8/8/2007 0.063 U 34 30 11 232

GRANGER 8/9/2007 0.066 U 14 11 8.3 353

SULFUR REP 8/9/2007 0.062 U 14 12 7.1 299

SPRING 8/9/2007 0.063 U 14 11 6 265

Methoxychlor TSS Turbidity TNVSS Conductivity

 U = not detected at or above reported value J = estimated na = not analyzed
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Collection Flow 

Sample No. Field ID Date (cfs) (ng/L) (ng/L) (ng/L)

7344082 HARRISON 8/23/2007 1,653 0.064 U 0.064 U 0.064 U

7344085 PARKER 8/23/2007 578 0.063 U 0.11 0.063 U

7344088 EUCILID 8/23/2007 1,414 0.083 0.54 0.11

7344090 KIONA 8/23/2007 2,682 0.061 U 0.23 0.075

7344083 NACHES 8/22/2007 394 0.063 U 0.21 0.075

7344084 MOXEE 8/22/2007 78 0.23 1.3 0.25

7344086 GRANGER 8/22/2007 42 0.6 2.8 0.31

7344087 SULFUR 8/22/2007 401 0.58 2.4 0.19

7344089 SPRING 8/23/2007 36 0.065 U 0.46 0.14

7364080 CHERRY 9/5/2007 422 0.065 0.13 0.061 U

7364081 WIPPLE 9/5/2007 203 0.063 0.27 0.062 U

7364082 HARRISON 9/5/2007 462 0.061 U 0.061 U 0.061 U

7364085 PARKER 9/6/2007 452 0.067 U 0.12 0.067 U

7364088 EUCLID 9/6/2007 1,041 0.063 U 0.42 0.11

7364090 KIONA 9/6/2007 2,421 0.063 U 0.18 0.063 U

7364091 KIONA REP 9/6/2007 - - 0.065 U 0.17 0.065 U

7364083 NACHES 9/5/2007 1,720 0.061 U 0.16 0.061 U

7364084 MOXEE 9/5/2007 54 0.19 1.1 0.2

7364086 GRANGER 9/6/2007 40 0.28 2 0.29

7364087 SULFUR 9/6/2007 364 0.16 1.2 0.14

7364089 SPRING 9/6/2007 71 0.063 U 0.42 0.12

7384082 HARRISON 9/19/2007 520 0.063 U 0.063 U 0.063 U

7384085 PARKER 9/19/2007 473 0.063 U 0.15 0.063 U

7384088 EUCLID 9/20/2007 1,049 0.061 U 0.45 0.085

7384090 KIONA 9/20/2007 2,519 0.063 U 0.18 0.063 U

7384083 NACHES 9/19/2007 2,386 0.063 U 0.13 0.063 U

7384084 MOXEE 9/19/2007 61 0.23 1.2 0.22

7384086 GRANGER 9/20/2007 39 0.33 2 0.3

7384087 SULFUR 9/20/2007 346 0.093 0.87 0.14

7384089 SPRING 9/20/2007 28 0.063 U 0.4 0.13

7384092 TRNSFR BLNK 9/19/2007 - - 0.063 U 0.063 U 0.063 U

4,4'-DDT 4,4'-DDE 4,4'-DDD

U = not detected at or above reported value J = estimated na = not analyzed
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Collection 

Field ID Date (ng/L) (ng/L) (ng/L) (ng/L) (ng/L)

HARRISON 8/23/2007 0.064 U 0.064 U 0.064 U 0.064 U 0.083 J

PARKER 8/23/2007 0.076 J 0.063 U 0.063 U 0.063 U 0.25

EUCILID 8/23/2007 0.18 J 2 1 0.3 J 0.99

KIONA 8/23/2007 0.15 J 1.5 0.46 0.25 1.3

NACHES 8/22/2007 0.063 U 0.071 UJ 0.077 0.063 U 0.22

MOXEE 8/22/2007 0.062 U 0.22 J 0.19 0.35 0.9

GRANGER 8/22/2007 0.37 0.49 2.9 0.49 1.6

SULFUR 8/22/2007 0.65 0.85 4 1.6 2

SPRING 8/23/2007 0.15 J 0.38 J 1.1 0.93 9.3

CHERRY 9/5/2007 0.21 0.061 U 0.061 U 0.061 U 0.078

WIPPLE 9/5/2007 0.26 0.062 U 0.062 U 0.062 U 0.12

HARRISON 9/5/2007 0.061 U 0.061 U 0.061 U 0.061 U 0.066 J

PARKER 9/6/2007 0.067 U 0.067 U 0.1 J 0.12 0.14 J

EUCLID 9/6/2007 0.14 J 2.5 0.15 0.068 J 0.67

KIONA 9/6/2007 0.12 J 1 0.063 U 0.063 U 0.67

KIONA REP 9/6/2007 0.19 1.1 0.065 U 0.065 U 0.64

NACHES 9/5/2007 0.061 U 0.061 U 0.061 U 0.061 U 0.2 J

MOXEE 9/5/2007 0.062 U 0.062 U 0.55 0.35 0.92

GRANGER 9/6/2007 0.21 J 0.47 J 0.18 0.16 J 0.96

SULFUR 9/6/2007 0.31 J 0.52 J 0.24 0.31 J 0.78

SPRING 9/6/2007 0.17 J 0.21 J 0.13 0.23 J 2.4

HARRISON 9/19/2007 0.12 0.063 U 0.063 U 0.063 UJ 0.1 J

PARKER 9/19/2007 0.063 U 0.063 U 0.063 U 0.063 UJ 0.28 J

EUCLID 9/20/2007 0.11 J 5.1 0.087 U 0.061 UJ 0.46 J

KIONA 9/20/2007 0.1 J 2.2 0.068 UJ 0.063 UJ 0.48 J

NACHES 9/19/2007 0.063 U 0.063 U 0.063 U 0.063 UJ 0.22 J

MOXEE 9/19/2007 0.15 0.2 UJ 0.17 0.31 J 0.58 J

GRANGER 9/20/2007 0.12 J 0.08 J 0.086 UJ 0.084 J 0.47 J

SULFUR 9/20/2007 0.25 0.31 0.085 UJ 0.1 J 0.43 J

SPRING 9/20/2007 0.17 J 0.16 J 0.12 UJ 0.1 J 1.7 J

TRNSFR BLNK 9/19/2007 0.063 U 0.063 U 0.063 U 0.063 UJ 0.063 UJ

Dieldrin Chlorpyrifos

Endosulfan 

I Endosulfan II

Endosulfan 

Sulfate

U = not detected at or above reported value J = estimated na = not analyzed
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Collection 

Field ID Date (ng/L) (ng/L) (ng/L) (ng/L) (ng/L) (ng/L)

HARRISON 8/23/2007 3.2 U 0.064 U 0.064 U 0.064 U 0.064 U 0.064 U

PARKER 8/23/2007 3.2 U 0.063 U 0.063 U 0.063 U 0.063 U 0.063 U

EUCILID 8/23/2007 3.2 U 0.063 U 0.063 U 0.063 U 0.063 U 0.063 U

KIONA 8/23/2007 3.0 U 0.061 U 0.061 U 0.061 U 0.061 U 0.061 U

NACHES 8/22/2007 3.2 U 0.063 U 0.063 U 0.063 U 0.063 U 0.063 U

MOXEE 8/22/2007 3.1 U 0.062 U 0.062 U 0.062 U 0.062 U 0.062 U

GRANGER 8/22/2007 3.1 U 0.063 U 0.063 U 0.063 U 0.063 U 0.063 U

SULFUR 8/22/2007 3.2 U 0.063 U 0.063 U 0.063 U 0.063 U 0.063 U

SPRING 8/23/2007 3.2 U 0.065 U 0.065 U 0.065 U 0.065 U 0.065 U

CHERRY 9/5/2007 3.1 U 0.061 U 0.061 U 0.061 U 0.061 U 0.061 U

WIPPLE 9/5/2007 3.1 U 0.062 U 0.062 U 0.062 U 0.062 U 0.062 U

HARRISON 9/5/2007 3 U 0.061 U 0.061 U 0.061 U 0.061 U 0.061 U

PARKER 9/6/2007 3.3 U 0.067 U 0.067 U 0.067 U 0.067 U 0.067 U

EUCLID 9/6/2007 3.1 U 0.063 U 0.063 U 0.063 U 0.063 U 0.063 U

KIONA 9/6/2007 3.1 U 0.063 U 0.063 U 0.063 U 0.063 U 0.063 U

KIONA REP 9/6/2007 3.3 U 0.065 U 0.065 U 0.065 U 0.065 U 0.065 U

NACHES 9/5/2007 3 U 0.061 U 0.061 U 0.061 U 0.061 U 0.061 U

MOXEE 9/5/2007 3.1 U 0.062 U 0.062 U 0.062 U 0.062 U 0.062 U

GRANGER 9/6/2007 3.1 U 0.063 U 0.063 U 0.063 U 0.063 U 0.063 U

SULFUR 9/6/2007 3.1 U 0.063 U 0.063 U 0.063 U 0.063 U 0.063 U

SPRING 9/6/2007 3.2 U 0.063 U 0.063 U 0.063 U 0.063 U 0.063 U

HARRISON 9/19/2007 3.2 U 0.063 U 0.063 U 0.063 U 0.063 UJ 0.063 U

PARKER 9/19/2007 3.1 U 0.063 U 0.063 U 0.063 U 0.063 UJ 0.063 U

EUCLID 9/20/2007 3.1 U 0.061 U 0.061 U 0.061 U 0.061 UJ 0.061 U

KIONA 9/20/2007 3.2 U 0.063 U 0.063 U 0.063 U 0.063 UJ 0.063 U

NACHES 9/19/2007 3.1 U 0.063 U 0.063 U 0.063 U 0.063 UJ 0.063 U

MOXEE 9/19/2007 3.1 U 0.062 U 0.062 U 0.062 U 0.062 UJ 0.062 U

GRANGER 9/20/2007 3.1 U 0.062 U 0.062 U 0.062 U 0.062 UJ 0.062 U

SULFUR 9/20/2007 3.1 U 0.061 U 0.061 U 0.061 U 0.061 UJ 0.061 U

SPRING 9/20/2007 3.1 U 0.063 U 0.063 U 0.063 U 0.063 UJ 0.081

TRNSFR BLNK 9/19/2007 3.2 U 0.063 U 0.063 U 0.063 U 0.063 UJ 0.063 U

CisChlordane CisNonachlorTransChlordane TransToxaphene NonachlorOxychlordane

 U = not detected at or above reported value J = estimated na = not analyzed
Yakima Pesticides/PCBs TMDL: Vol 1, WQ Study Findings 

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Collection 

Field ID Date (ng/L) (ng/L) (ng/L) (ng/L) (ng/L) (ng/L)

HARRISON 8/23/2007 0.064 U 0.064 U 0.064 U 0.064 U 0.064 UJ 0.064 UJ

PARKER 8/23/2007 0.063 U 0.063 U 0.063 U 0.063 U 0.063 U 0.063 U

EUCILID 8/23/2007 0.063 U 0.063 U 0.063 U 0.063 U 0.063 U 0.22 J

KIONA 8/23/2007 0.061 U 0.061 U 0.061 U 0.061 U 0.061 U 0.26

NACHES 8/22/2007 0.063 U 0.063 U 0.063 U 0.063 U 0.063 UJ 0.063 UJ

MOXEE 8/22/2007 0.062 U 0.062 U 0.062 U 0.062 U 0.062 UJ 0.062 UJ

GRANGER 8/22/2007 0.063 U 0.063 U 0.063 U 0.063 U 0.063 U 0.21

SULFUR 8/22/2007 0.063 U 0.063 U 0.063 U 0.063 U 0.063 U 0.19 J

SPRING 8/23/2007 0.065 U 0.065 U 0.065 U 0.065 U 0.065 U 0.065 U

CHERRY 9/5/2007 0.061 U 0.061 U 0.061 U 0.061 U 0.061 U 0.061 U

WIPPLE 9/5/2007 0.062 U 0.062 U 0.062 U 0.062 U 0.062 U 0.062 U

HARRISON 9/5/2007 0.061 U 0.061 U 0.061 U 0.061 U 0.061 U 0.061 U

PARKER 9/6/2007 0.067 U 0.067 U 0.067 U 0.067 U 0.067 U 0.067 U

EUCLID 9/6/2007 0.063 U 0.063 U 0.063 U 0.063 U 0.063 U 0.14 UJ

KIONA 9/6/2007 0.063 U 0.063 U 0.063 U 0.063 U 0.063 U 0.095 UJ

KIONA REP 9/6/2007 0.065 U 0.065 U 0.065 U 0.065 U 0.065 U 0.076 UJ

NACHES 9/5/2007 0.061 U 0.061 U 0.061 U 0.061 U 0.061 U 0.061 U

MOXEE 9/5/2007 0.062 U 0.062 U 0.062 U 0.062 U 0.062 U 0.062 U

GRANGER 9/6/2007 0.063 U 0.063 U 0.063 U 0.063 U 0.063 U 0.063 U

SULFUR 9/6/2007 0.063 U 0.063 U 0.063 U 0.063 U 0.063 U 0.063 U

SPRING 9/6/2007 0.063 U 0.063 U 0.063 U 0.063 U 0.063 U 0.063 U

HARRISON 9/19/2007 0.063 U 0.063 U 0.063 U 0.063 U 0.063 U 0.063 UJ

PARKER 9/19/2007 0.063 U 0.063 U 0.063 U 0.063 U 0.063 U 0.063 UJ

EUCLID 9/20/2007 0.061 U 0.061 U 0.061 U 0.061 U 0.061 U 0.061 UJ

KIONA 9/20/2007 0.063 U 0.063 U 0.063 U 0.063 U 0.063 U 0.063 UJ

NACHES 9/19/2007 0.063 U 0.063 U 0.063 U 0.063 U 0.063 U 0.063 UJ

MOXEE 9/19/2007 0.062 U 0.062 U 0.062 U 0.062 U 0.062 U 0.062 UJ

GRANGER 9/20/2007 0.062 U 0.062 U 0.062 U 0.062 U 0.062 U 0.062 UJ

SULFUR 9/20/2007 0.061 U 0.061 U 0.061 U 0.061 U 0.061 U 0.061 UJ

SPRING 9/20/2007 0.063 U 0.063 U 0.063 U 0.063 U 0.063 U 0.063 UJ

TRNSFR BLNK 9/19/2007 0.063 U 0.063 U 0.063 U 0.063 U 0.063 U 0.063 UJ

Alpha-BHC

BetaBHCDeltaBHC Lindane Aldrin Endrin

U = not detected at or above reported value J = estimated na = not analyzed
Yakima Pesticides/PCBs TMDL: Vol 1, WQ Study Findings 

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Collection 

Field ID Date (ng/L) (ng/L) (ng/L) (ng/L) (ng/L)

HARRISON 8/23/2007 0.064 U 0.064 U 0.064 U 0.064 UJ 0.064 U

PARKER 8/23/2007 0.063 U 0.063 U 0.063 U 0.063 U 0.063 U

EUCILID 8/23/2007 0.063 U 0.063 U 0.063 U 0.063 U 0.063 U

KIONA 8/23/2007 0.061 U 0.091 UJ 0.061 U 0.061 U 0.061 U

NACHES 8/22/2007 0.063 U 0.063 U 0.063 U 0.12 UJ 0.063 U

MOXEE 8/22/2007 0.062 U 0.062 U 0.062 U 0.062 UJ 0.062 U

GRANGER 8/22/2007 0.063 U 0.063 U 0.063 U 0.095 0.063 U

SULFUR 8/22/2007 0.14 UJ 0.063 U 0.063 U 0.063 U 0.063 U

SPRING 8/23/2007 0.065 U 0.065 U 0.065 U 0.065 U 0.065 U

CHERRY 9/5/2007 0.061 U 0.061 U 0.061 U 0.061 U 0.061 U

WIPPLE 9/5/2007 0.062 U 0.062 U 0.062 U 0.062 U 0.062 U

HARRISON 9/5/2007 0.061 U 0.061 U 0.061 U 0.061 U 0.061 U

PARKER 9/6/2007 0.085 UJ 0.067 U 0.067 U 0.067 U 0.067 U

EUCLID 9/6/2007 0.063 U 0.063 U 0.063 U 0.063 U 0.063 U

KIONA 9/6/2007 0.063 U 0.091 UJ 0.063 U 0.063 U 0.063 U

KIONA REP 9/6/2007 0.22 UJ 0.31 UJ 0.065 U 0.065 U 0.065 U

NACHES 9/5/2007 0.061 U 0.061 U 0.061 U 0.061 U 0.061 U

MOXEE 9/5/2007 0.073 UJ 0.062 U 0.062 U 0.062 U 0.062 U

GRANGER 9/6/2007 0.063 U 0.063 U 0.063 U 0.063 U 0.063 U

SULFUR 9/6/2007 0.077 UJ 0.063 U 0.063 U 0.074 UJ 0.063 U

SPRING 9/6/2007 0.08 UJ 0.063 U 0.063 U 0.063 U 0.063 U

HARRISON 9/19/2007 0.063 U 0.063 U 0.063 U 0.063 U 0.063 U

PARKER 9/19/2007 0.063 U 0.063 U 0.063 U 0.063 U 0.063 U

EUCLID 9/20/2007 0.061 U 0.061 U 0.061 U 0.061 U 0.061 U

KIONA 9/20/2007 0.063 U 0.063 U 0.063 U 0.063 U 0.063 U

NACHES 9/19/2007 0.063 U 0.063 U 0.063 U 0.063 U 0.063 U

MOXEE 9/19/2007 0.31 UJ 0.062 U 0.062 U 0.062 U 0.062 U

GRANGER 9/20/2007 0.062 U 0.062 U 0.062 U 0.08 0.062 U

SULFUR 9/20/2007 0.061 U 0.061 U 0.061 U 0.061 U 0.061 U

SPRING 9/20/2007 0.063 U 0.063 U 0.063 U 0.063 U 0.063 U

TRNSFR BLNK 9/19/2007 0.063 U 0.063 U 0.063 U 0.063 U 0.063 U

Endrin 

Aldehyde

Endrin 

Ketone Heptachlor

Heptachlor 

Epoxide

Hexachlorobenzene

U = not detected at or above reported value J = estimated na = not analyzed
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Collection Conductivity

Field ID Date (ng/L) (mg/L) (mg/L) (NTU) (umhos/cm)

HARRISON 8/23/2007 0.18 UJ 8 6 4.4 95.3

PARKER 8/23/2007 0.063 U 8 6 4 107

EUCILID 8/23/2007 0.063 U 14 11 7.4 214

KIONA 8/23/2007 0.061 U 11 9 5 239

NACHES 8/22/2007 0.37 UJ 6 4 4.3 88.4

MOXEE 8/22/2007 0.062 UJ 56 51 16 217

GRANGER 8/22/2007 0.063 U 17 15 7.6 425

SULFUR 8/22/2007 0.063 U 38 35 16 270

SPRING 8/23/2007 0.28 UJ 10 8 5.2 309

CHERRY 9/5/2007 0.061 U 24 21 10 284

WIPPLE 9/5/2007 0.062 U 28 24 13 196

HARRISON 9/5/2007 0.061 U 2 1 1.7 115

PARKER 9/6/2007 0.46 UJ 10 8 5.1 111

EUCLID 9/6/2007 0.063 U 11 9 5 255

KIONA 9/6/2007 0.063 U 6 5 2.8 274

KIONA REP 9/6/2007 0.065 U 7 6 2.9 274

NACHES 9/5/2007 0.061 U 14 12 11 79.3

MOXEE 9/5/2007 0.2 UJ 36 33 11 265

GRANGER 9/6/2007 0.063 U 11 10 5.2 396

SULFUR 9/6/2007 0.12 UJ 17 15 7.7 316

SPRING 9/6/2007 0.063 U 14 12 3.8 288

HARRISON 9/19/2007 0.063 UJ 4 3 2.4 145

PARKER 9/19/2007 0.063 UJ 13 11 11 112

EUCLID 9/20/2007 0.061 UJ 10 8 6 252

KIONA 9/20/2007 0.19 UJ 5 4 2.8 278

NACHES 9/19/2007 0.063 UJ 14 12 12 79.6

MOXEE 9/19/2007 0.062 UJ 41 37 16 280

GRANGER 9/20/2007 0.062 UJ 20 18 11 374

SULFUR 9/20/2007 0.061 UJ 21 19 9.2 300

SPRING 9/20/2007 0.063 UJ 6 5 2.9 376

TRNSFR BLNK 9/19/2007 0.063 UJ na na na na

Methoxychlor TSS TNVSS Turbidity

 U = not detected at or above reported value J = estimated na = not analyzed
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Collection Flow 4,4'-DDT 4,4'-DDE 4,4'-DDD

Sample No. Field ID Date (cfs) (ng/L) (ng/L) (ng/L)

7404080 CHERRY 10/3/2007 516 0.064 U 0.36 J 0.064 U

7404081 WIPPLE 10/3/2007 204 0.093 J 0.55 J 0.063 U

7404082 HARRISON 10/3/2007 486 0.063 U 0.063 UJ 0.063 U

7404085 PARKER 10/3/2007 716 0.061 U 0.18 J 0.061 U

7404088 EUCLID 10/4/2007 1,359 0.065 U 0.77 J 0.12

7404090 KIONA 10/4/2007 2,943 0.061 U 0.39 J 0.092

7404083 NACHES 10/3/2007 1,172 0.069 UJ 0.31 J 0.078 UJ

7404084 MOXEE 10/3/2007 67 0.28 1.5 J 0.25

7404086 GRANGER 10/4/2007 42 0.23 3.2 J 0.38

7404091 GRANGER REP 10/4/2007 - - 0.29 3.6 J 0.46

7404087 SULFUR 10/4/2007 413 0.092 J 1.3 J 0.18

7404089 SPRING 10/4/2007 77 0.37 0.95 J 0.26

7454082 HARRISON 11/8/2007 848 0.063 U 0.063 U 0.063 U

7454085 PARKER 11/8/2007 1,373 0.063 U 0.068 0.063 U

7454091 PARKER REP 11/8/2007 - - 0.063 U 0.066 0.063 U

7454088 EUCLID 11/8/2007 1,430 0.063 U 0.19 0.063 U

7454090 KIONA 11/8/2007 2,702 0.067 U 0.18 0.067 U

7454083 NACHES 11/8/2007 456 0.064 U 0.081 0.064 U

7454084 MOXEE 11/8/2007 15 0.064 U 0.081 0.064 U

7454086 GRANGER 11/8/2007 22 0.12 J 1.9 0.31

7454087 SULFUR 11/8/2007 101 0.062 U 1.2 0.23

7454089 SPRING 11/8/2007 12 0.062 U 0.39 0.12

7494082 HARRISON 12/4/2007 794 0.065 U 0.065 U 0.065 U

7494091 HARRISON REP 12/4/2007 - - 0.065 U 0.065 U 0.065 U

7494085 PARKER 12/4/2007 5,500 0.1 0.32 0.083

7494088 EUCLID 12/5/2007 3,724 0.12 J 0.75 J 0.15 J

7494090 KIONA 12/5/2007 3,865 0.22 1.3 0.22

7494083 NACHES 12/4/2007 5,447 0.13 J 0.27 J 0.07 J

7494084 MOXEE 12/4/2007 16 0.078 0.43 0.12

7494086 GRANGER 12/5/2007 22 0.13 2.8 0.43

7494087 SULFUR 12/5/2007 70 0.074 1.8 0.36

7494089 SPRING 12/5/2007 8 0.065 U 0.3 0.11

U = not detected at or above reported value J = estimated na = not analyzed
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Collection Dieldrin

Field ID Date (ng/L) (ng/L) (ng/L) (ng/L) (ng/L)

CHERRY 10/3/2007 0.29 28 0.064 U 0.064 U 0.064 U

WIPPLE 10/3/2007 0.37 1.5 0.063 U 0.13 UJ 0.12

HARRISON 10/3/2007 0.11 4 0.063 U 0.063 U 0.12 J

PARKER 10/3/2007 0.061 U 1.3 J 0.061 U 0.061 U 0.21

EUCLID 10/4/2007 0.066 UJ 15 0.065 U 0.065 U 0.35

KIONA 10/4/2007 0.07 J 9.5 0.061 U 0.061 U 0.39

NACHES 10/3/2007 0.062 U 0.062 U 0.087 J 0.062 U 0.15

MOXEE 10/3/2007 0.061 J 1.5 0.14 0.83 0.52

GRANGER 10/4/2007 0.14 J 0.47 J 0.061 U 0.061 U 0.41

GRANGER REP 10/4/2007 0.14 J 0.45 J 0.063 U 0.063 U 0.41

SULFUR 10/4/2007 0.2 J 1.3 0.063 U 0.085 J 0.4

SPRING 10/4/2007 0.14 J 1.1 0.11 J 0.16 J 1

HARRISON 11/8/2007 0.063 U 0.063 U 0.063 U 0.063 U 0.089 J

PARKER 11/8/2007 0.063 U 0.11 UJ 0.063 U 0.1 0.16 J

PARKER REP 11/8/2007 0.063 U 0.12 UJ 0.063 U 0.11 J 0.15

EUCLID 11/8/2007 0.063 U 0.41 J 0.063 U 0.089 J 0.16

KIONA 11/8/2007 0.067 U 0.37 J 0.067 U 0.073 J 0.19

NACHES 11/8/2007 0.064 U 0.064 U 0.064 U 0.064 U 0.079

MOXEE 11/8/2007 0.064 U 0.064 U 0.064 U 0.064 U 0.079

GRANGER 11/8/2007 0.082 J 0.27 0.062 U 0.062 U 0.24

SULFUR 11/8/2007 0.32 J 0.062 U 0.11 0.094 J 0.6

SPRING 11/8/2007 0.19 0.062 U 0.062 U 0.062 U 0.64

HARRISON 12/4/2007 0.065 U 0.065 U 0.065 U 0.065 U 0.065 U

HARRISON REP 12/4/2007 0.065 U 0.065 U 0.065 U 0.065 U 0.089

PARKER 12/4/2007 0.063 U 0.063 U 0.063 U 0.08 0.36 J

EUCLID 12/5/2007 0.063 U 0.36 J 0.063 U 0.11 0.41

KIONA 12/5/2007 0.084 0.71 J 0.078 0.13 0.48

NACHES 12/4/2007 0.063 U 0.063 U 0.063 U 0.085 0.26 J

MOXEE 12/4/2007 0.064 0.32 0.15 0.43 0.94

GRANGER 12/5/2007 0.13 0.065 U 0.065 U 0.065 U 0.29

SULFUR 12/5/2007 0.37 0.07 0.063 U 0.14 0.44

SPRING 12/5/2007 0.16 0.065 U 0.065 U 0.065 U 0.9

Endosulfan 

I

Endosulfan 

II

Endosulfan 

Chlorpyrifos Sulfate

U = not detected at or above reported value. J = estimated. na = not analyzed. 
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Collection 

Field ID Date (ng/L) (ng/L) (ng/L) (ng/L) (ng/L) (ng/L)

CHERRY 10/3/2007 3.2 U 0.064 U 0.064 U 0.064 U 0.064 U 0.064 U

WIPPLE 10/3/2007 3.1 U 0.063 U 0.063 U 0.063 U 0.063 U 0.063 U

HARRISON 10/3/2007 3.2 U 0.063 U 0.063 U 0.063 U 0.063 U 0.063 U

PARKER 10/3/2007 3 U 0.061 U 0.061 U 0.061 U 0.061 U 0.061 U

EUCLID 10/4/2007 3.2 U 0.065 U 0.065 U 0.065 U 0.065 U 0.065 U

KIONA 10/4/2007 3 U 0.061 U 0.061 U 0.061 U 0.061 U 0.061 U

NACHES 10/3/2007 3.1 U 0.062 U 0.062 U 0.062 U 0.062 U 0.062 U

MOXEE 10/3/2007 3 U 0.061 U 0.061 U 0.061 U 0.061 U 0.061 U

GRANGER 10/4/2007 3 U 0.061 U 0.061 U 0.061 U 0.061 U 0.061 U

GRANGER REP 10/4/2007 3.1 U 0.063 U 0.063 U 0.063 U 0.063 U 0.063 U

SULFUR 10/4/2007 3.1 U 0.063 U 0.063 U 0.063 U 0.063 U 0.063 U

SPRING 10/4/2007 3.1 U 0.063 U 0.063 U 0.063 U 0.063 U 0.063 U

HARRISON 11/8/2007 3.2 U 0.063 U 0.063 U 0.063 U 0.063 U 0.063 U

PARKER 11/8/2007 3.1 U 0.063 U 0.063 U 0.063 U 0.063 U 0.063 U

PARKER REP 11/8/2007 3.1 U 0.063 U 0.063 U 0.063 U 0.063 U 0.063 U

EUCLID 11/8/2007 3.1 U 0.063 U 0.063 U 0.063 U 0.063 U 0.063 U

KIONA 11/8/2007 3.3 U 0.067 U 0.067 U 0.067 U 0.067 U 0.067 U

NACHES 11/8/2007 3.2 U 0.064 U 0.064 U 0.064 U 0.064 U 0.064 U

MOXEE 11/8/2007 3.2 U 0.064 U 0.064 U 0.064 U 0.064 U 0.064 U

GRANGER 11/8/2007 3.1 U 0.062 U 0.062 U 0.062 U 0.062 U 0.062 U

SULFUR 11/8/2007 3.1 U 0.062 U 0.062 U 0.062 U 0.062 U 0.062 U

SPRING 11/8/2007 3.1 U 0.062 U 0.062 U 0.062 U 0.062 U 0.062 U

HARRISON 12/4/2007 3.3 U 0.065 U 0.065 U 0.065 U 0.065 U 0.065 U

HARRISON REP 12/4/2007 3.3 U 0.065 U 0.065 U 0.065 U 0.065 U 0.065 U

PARKER 12/4/2007 3.1 U 0.063 U 0.063 U 0.063 U 0.063 U 0.063 U

EUCLID 12/5/2007 3.1 UJ 0.063 UJ 0.063 UJ 0.063 UJ 0.063 UJ 0.063 UJ

KIONA 12/5/2007 3.1 U 0.062 U 0.062 U 0.062 U 0.062 U 0.062 U

NACHES 12/4/2007 3.1 UJ 0.063 UJ 0.063 UJ 0.063 UJ 0.063 UJ 0.063 UJ

MOXEE 12/4/2007 3.1 U 0.062 U 0.062 U 0.062 U 0.062 U 0.062 U

GRANGER 12/5/2007 3.3 U 0.065 U 0.065 U 0.065 U 0.065 U 0.065 U

SULFUR 12/5/2007 3.1 U 0.063 U 0.063 U 0.063 U 0.063 U 0.063 U

SPRING 12/5/2007 3.2 U 0.065 U 0.065 U 0.065 U 0.065 U 0.065 U

Toxaphene

CisChlordane CisNonachlorTransChlordane TransNonachlorOxychlordane

 U = not detected at or above reported value. J = estimated. na = not analyzed. 
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Collection 

Field ID Date (ng/L) (ng/L) (ng/L) (ng/L) (ng/L) (ng/L)

CHERRY 10/3/2007 0.064 U 0.064 U 0.064 UJ 0.064 U 0.08 UJ 0.064 U

WIPPLE 10/3/2007 0.063 U 0.063 U 0.063 UJ 0.063 U 0.063 U 0.063 U

HARRISON 10/3/2007 0.063 U 0.063 U 0.063 UJ 0.063 U 0.063 U 0.063 U

PARKER 10/3/2007 0.061 U 0.061 U 0.061 UJ 0.061 U 0.061 U 0.061 U

EUCLID 10/4/2007 0.065 U 0.065 U 0.065 UJ 0.065 U 0.065 U 0.065 U

KIONA 10/4/2007 0.061 U 0.061 U 0.061 UJ 0.061 U 0.061 U 0.18 UJ

NACHES 10/3/2007 0.062 U 0.062 U 0.062 UJ 0.069 UJ 0.062 U 0.062 U

MOXEE 10/3/2007 0.061 U 0.061 U 0.061 UJ 0.061 U 0.061 U 0.061 U

GRANGER 10/4/2007 0.061 U 0.061 U 0.061 UJ 0.061 U 0.061 U 0.061 U

GRANGER REP 10/4/2007 0.063 U 0.063 U 0.063 UJ 0.063 U 0.063 U 0.063 U

SULFUR 10/4/2007 0.063 U 0.063 U 0.063 UJ 0.063 U 0.063 U 0.095 UJ

SPRING 10/4/2007 0.063 U 0.063 U 0.063 UJ 0.063 U 0.063 U 0.071 UJ

HARRISON 11/8/2007 0.063 U 0.063 U 0.063 UJ 0.063 U 0.063 U 0.063 U

PARKER 11/8/2007 0.063 U 0.063 U 0.063 UJ 0.063 U 0.063 U 0.063 U

PARKER REP 11/8/2007 0.063 U 0.53 UJ 0.063 UJ 0.063 U 0.063 U 0.063 U

EUCLID 11/8/2007 0.063 U 0.09 UJ 0.063 UJ 0.063 U 0.063 U 0.063 U

KIONA 11/8/2007 0.067 U 0.067 U 0.067 UJ 0.067 U 0.067 U 0.067 U

NACHES 11/8/2007 0.064 U 0.064 U 0.064 UJ 0.064 U 0.064 U 0.064 U

MOXEE 11/8/2007 0.064 U 0.064 U 0.064 UJ 0.064 U 0.064 U 0.064 U

GRANGER 11/8/2007 0.062 U 0.064 UJ 0.062 UJ 0.062 U 0.062 U 0.062 U

SULFUR 11/8/2007 0.062 U 0.062 U 0.062 UJ 0.062 U 0.062 U 0.062 U

SPRING 11/8/2007 0.062 U 0.062 U 0.062 UJ 0.062 U 0.062 U 0.062 U

HARRISON 12/4/2007 0.065 U 0.21 UJ 0.065 U 0.065 U 0.065 UJ 0.065 U

HARRISON REP 12/4/2007 0.065 U 0.15 UJ 0.065 U 0.065 U 0.065 UJ 0.065 U

PARKER 12/4/2007 0.063 U 0.063 U 0.063 U 0.063 U 0.063 UJ 0.063 U

EUCLID 12/5/2007 0.063 UJ 0.075 UJ 0.063 UJ 0.063 UJ 0.063 UJ 0.063 U

KIONA 12/5/2007 0.062 U 0.094 UJ 0.062 U 0.062 U 0.062 UJ 0.062 U

NACHES 12/4/2007 0.063 UJ 0.091 UJ 0.063 UJ 0.063 UJ 0.063 UJ 0.063 U

MOXEE 12/4/2007 0.062 U 0.11 UJ 0.062 U 0.062 U 0.062 UJ 0.067 UJ

GRANGER 12/5/2007 0.065 U 0.12 UJ 0.065 U 0.065 U 0.065 UJ 0.091 UJ

SULFUR 12/5/2007 0.063 U 0.09 UJ 0.063 U 0.063 U 0.063 UJ 0.083 UJ

SPRING 12/5/2007 0.065 U 0.065 U 0.065 U 0.065 U 0.065 UJ 0.065 U

Alpha-BHC Beta-BHC

DeltaBHC Lindane Aldrin Endrin

 U = not detected at or above reported value. J = estimated. na = not analyzed. 
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Collection 

Field ID Date (ng/L) (ng/L) (ng/L) (ng/L) (ng/L)

CHERRY 10/3/2007 0.11 UJ 0.064 U 0.064 U 0.064 U 0.064 U

WIPPLE 10/3/2007 0.063 U 0.063 U 0.063 U 0.063 U 0.063 U

HARRISON 10/3/2007 0.063 U 0.063 U 0.063 U 0.063 U 0.063 U

PARKER 10/3/2007 0.061 U 0.061 U 0.061 U 0.061 U 0.061 U

EUCLID 10/4/2007 0.065 U 0.065 U 0.065 U 0.065 U 0.065 U

KIONA 10/4/2007 0.061 U 0.061 U 0.061 U 0.061 U 0.061 U

NACHES 10/3/2007 0.062 U 0.062 U 0.062 U 0.062 U 0.062 U

MOXEE 10/3/2007 1.1 UJ 0.061 U 0.061 U 0.061 U 0.061 U

GRANGER 10/4/2007 0.061 U 0.061 U 0.061 U 0.061 U 0.061 U

GRANGER REP 10/4/2007 0.063 U 0.063 U 0.063 U 0.063 U 0.063 U

SULFUR 10/4/2007 0.063 U 0.063 U 0.063 U 0.063 U 0.063 U

SPRING 10/4/2007 0.063 U 0.063 U 0.063 U 0.063 U 0.063 U

HARRISON 11/8/2007 0.11 UJ 0.063 U 0.063 U 0.063 U 0.063 U

PARKER 11/8/2007 0.13 UJ 0.063 U 0.063 U 0.063 U 0.063 U

PARKER REP 11/8/2007 0.13 UJ 0.063 U 0.063 U 0.063 U 0.063 U

EUCLID 11/8/2007 0.07 UJ 0.063 U 0.063 U 0.063 U 0.063 U

KIONA 11/8/2007 0.15 UJ 0.067 U 0.067 U 0.067 U 0.067 U

NACHES 11/8/2007 0.074 UJ 0.064 U 0.064 U 0.064 U 0.064 U

MOXEE 11/8/2007 0.074 UJ 0.064 U 0.064 U 0.064 U 0.064 U

GRANGER 11/8/2007 0.064 UJ 0.062 U 0.062 U 0.062 U 0.062 U

SULFUR 11/8/2007 0.19 UJ 0.062 U 0.062 U 0.062 U 0.062 U

SPRING 11/8/2007 0.062 U 0.062 U 0.062 U 0.062 U 0.062 U

HARRISON 12/4/2007 0.065 UJ 0.065 U 0.065 U 0.065 U 0.16 U

HARRISON REP 12/4/2007 0.065 UJ 0.065 U 0.065 U 0.065 U 0.16 U

PARKER 12/4/2007 0.084 UJ 0.063 U 0.063 U 0.063 U 0.21 J

EUCLID 12/5/2007 0.063 UJ 0.063 U 0.063 UJ 0.063 U 0.16 UJ

KIONA 12/5/2007 0.062 UJ 0.062 U 0.062 U 0.062 U 0.16 U

NACHES 12/4/2007 0.15 UJ 0.077 UJ 0.063 UJ 0.063 U 0.16 UJ

MOXEE 12/4/2007 0.062 UJ 0.062 U 0.062 U 0.062 U 0.16 U

GRANGER 12/5/2007 0.065 UJ 0.065 U 0.065 U 0.065 U 0.16 U

SULFUR 12/5/2007 0.063 UJ 0.063 U 0.063 U 0.063 U 0.16 U

SPRING 12/5/2007 0.065 UJ 0.065 U 0.065 U 0.065 U 0.16 U

Endrin 

Aldehyde

Endrin 

Ketone Heptachlor

Heptachlor 

Epoxide

Hexachlorobenzene

U = not detected at or above reported value. J = estimated. na = not analyzed. 
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Collection Conductivity

Field ID Date (ng/L) (mg/L) (mg/L) (NTU) (umhos/cm)

CHERRY 10/3/2007 0.064 U 36 32 12 287

WIPPLE 10/3/2007 0.063 U 33 30 12 222

HARRISON 10/3/2007 0.063 U 5 4 3.8 156

PARKER 10/3/2007 0.061 U 8 7 5.3 140

EUCLID 10/4/2007 0.065 U 10 9 6.5 294

KIONA 10/4/2007 0.095 UJ 5 4 3.7 247

NACHES 10/3/2007 0.11 UJ 6 5 9.8 88.1

MOXEE 10/3/2007 0.36 UJ 34 31 12 304

GRANGER 10/4/2007 0.061 U 28 24 12 399

GRANGER REP 10/4/2007 0.063 U 26 23 12 403

SULFUR 10/4/2007 0.063 U 21 19 7.4 J 287

SPRING 10/4/2007 0.063 U 11 9 5 295

HARRISON 11/8/2007 0.063 U 8 6 3.3 152

PARKER 11/8/2007 0.063 U 4 3 1.6 157

PARKER REP 11/8/2007 0.063 U 3 2 1.7 157

EUCLID 11/8/2007 0.063 U 8 7 4.1 247

KIONA 11/8/2007 0.067 U 4 3 2.5 267

NACHES 11/8/2007 0.39 UJ 2 1 0.9 103

MOXEE 11/8/2007 0.39 UJ 2 1 0.9 103

GRANGER 11/8/2007 0.062 U 36 28 16 656

SULFUR 11/8/2007 0.062 U 12 9 7.2 750

SPRING 11/8/2007 0.062 U 5 4 2.4 598

HARRISON 12/4/2007 0.065 U 6 4 3.5 177

HARRISON REP 12/4/2007 0.42 UJ 6 5 3.6 178

PARKER 12/4/2007 0.063 U 164 143 120 101

EUCLID 12/5/2007 0.063 U 342 313 150 124

KIONA 12/5/2007 0.062 U 199 176 130 145

NACHES 12/4/2007 0.063 U 229 201 160 61.4

MOXEE 12/4/2007 0.062 U 4 2 6.6 758

GRANGER 12/5/2007 0.065 U 84 78 24 740

SULFUR 12/5/2007 0.063 U 40 33 19 750

SPRING 12/5/2007 0.065 U 3 2 1.3 665

Methoxychlor TSS TNVSS Turbidity

U = not detected at or above reported value. J = estimated. na = not analyzed. 
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Collection Flow 4,4'-DDT 4,4'-DDE 4,4'-DDD

Sample No. Field ID Date (cfs) (ng/L) (ng/L) (ng/L)

8024682 HARRISON 1/9/2008 433 0.063 U 0.063 U 0.063 U

8024683 NACHES 1/9/2008 883 0.062 U 0.062 U 0.062 U

8024691 NACHES REP 1/9/2008 - - 0.062 U 0.062 U 0.062 U

8024684 MOXEE 1/9/2008 13 0.072 0.39 0.12

8024685 PARKER 1/9/2008 1,536 0.064 U 0.064 U 0.064 U

8024686 GRANGER 1/10/2008 18 44 5.5 0.89

8024687 SULFUR 1/10/2008 64 0.11 2.5 0.45

8024688 EUCLID 1/10/2008 1,788 0.061 U 0.18 J 0.061 U

8024689 SPRING 1/10/2008 8 0.061 U 0.33 0.089

8024690 KIONA 1/10/2008 2,497 0.061 U 0.14 0.061 U

8024692 TRNSFR BLNK 1/9/2008 - - 0.062 U 0.062 U 0.062 U

8064082 HARRISON 2/5/2008 793 0.061 U 0.061 U 0.061 U

8064083 NACHES 2/5/2008 872 0.063 U 0.063 U 0.063 U

8064084 MOXEE 2/5/2008 13 0.061 UJ 0.27 J 0.2 J

8064091 MOXEE REP 2/5/2008 - - 0.061 U 0.28 0.15

8064085 PARKER 2/5/2008 1,472 0.063 UJ 0.073 J 0.063 UJ

8064086 GRANGER 2/6/2008 28 0.17 J 1 J 0.18 J

8064087 SULFUR 2/6/2008 73 0.33 J 1.8 J 0.42 J

8064088 EUCLID 2/6/2008 1,652 0.19 0.69 0.11

8064089 SPRING 2/6/2008 9 0.063 U 0.49 0.14

8064090 KIONA 2/6/2008 2,255 0.063 U 0.14 0.063 U

8104082 HARRISON 3/4/2008 679 0.061 U 0.061 U 0.061 U

8104083 NACHES 3/4/2008 1,113 0.061 U 0.064 0.061 U

8104084 MOXEE 3/4/2008 12 0.077 0.28 0.098

8104085 PARKER 3/4/2008 2,957 0.062 U 0.062 U 0.062 U

8104086 GRANGER 3/3/2008 18 0.15 2.1 0.42

8104087 SULFUR 3/3/2008 63 0.093 1.6 0.39

8104088 EUCLID 3/3/2008 3,259 0.063 U 0.2 0.063 U

8104090 SPRING 3/3/2008 6 0.061 U 0.31 0.081

8104091 KIONA 3/3/2008 4,151 0.062 U 0.26 0.096

8104089 KIONA REP 3/3/2008 - - 0.061 U 0.24 0.08

8134084 MOXEE 3/24/2008 38 0.26 1.1 0.2

8134086 GRANGER 3/28/2008 21 0.23 1.9 0.27

8134087 SULFUR 3/24/2008 303 0.16 1.4 0.19

8134091 SULFUR REP 3/24/2008 - - 0.16 1.5 0.2

8134089 SPRING 3/24/2008 41 0.15 0.78 0.15

U = not detected at or above reported value. J = estimated. na = not analyzed. 
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Collection

Field ID Date (ng/L) (ng/L) (ng/L) (ng/L) (ng/L)

HARRISON 1/9/2008 0.063 U 0.063 U 0.063 U 0.063 U 0.063 U

NACHES 1/9/2008 0.062 U 0.062 U 0.062 U 0.062 U 0.075 J

NACHES REP 1/9/2008 0.062 U 0.062 U 0.062 U 0.062 U 0.1 J

MOXEE 1/9/2008 0.063 U 0.31 J 0.063 U 0.15 0.79 J

PARKER 1/9/2008 0.064 U 0.18 J 0.064 U 0.064 U 0.17 J

GRANGER 1/10/2008 0.061 U 0.077 UJ 0.061 U 0.061 U 0.27 J

SULFUR 1/10/2008 0.22 0.33 J 0.061 U 0.11 0.51 J

EUCLID 1/10/2008 0.061 U 0.26 J 0.061 U 0.061 U 0.28 J

SPRING 1/10/2008 0.077 J 0.13 J 0.061 U 0.33 0.85 J

KIONA 1/10/2008 0.061 U 0.19 J 0.061 U 0.061 U 0.21 J

TRNSFR BLNK 1/9/2008 0.062 U 0.062 U 0.062 U 0.062 U 0.062 U

HARRISON 2/5/2008 0.061 U 0.15 UJ 0.061 U 0.061 U 0.22 J

NACHES 2/5/2008 0.063 U 0.092 J 0.063 U 0.063 U 0.11 J

MOXEE 2/5/2008 0.13 J 0.69 J 0.16 0.22 0.33 J

MOXEE REP 2/5/2008 0.12 J 0.79 J 0.1 J 0.24 0.3 J

PARKER 2/5/2008 0.063 U 0.33 J 0.072 J 0.12 0.25 J

GRANGER 2/6/2008 0.47 J 0.9 J 0.11 J 0.23 J 0.48 J

SULFUR 2/6/2008 0.66 0.58 UJ 0.41 UJ 0.13 J 0.37 J

EUCLID 2/6/2008 0.08 0.54 J 0.063 U 0.11 0.19 J

SPRING 2/6/2008 0.096 0.18 J 0.063 U 0.063 U 0.31 J

KIONA 2/6/2008 0.063 U 0.37 J 0.16 0.14 0.4 J

HARRISON 3/4/2008 0.061 U 0.13 UJ 0.061 U 0.061 UJ 0.061 UJ

NACHES 3/4/2008 0.061 U 0.065 0.061 U 0.061 UJ 0.11 UJ

MOXEE 3/4/2008 0.13 J 0.47 J 0.062 U 0.25 J 1.5 J

PARKER 3/4/2008 0.062 U 0.11 UJ 0.062 U 0.062 UJ 0.13 UJ

GRANGER 3/3/2008 0.17 0.15 0.062 U 0.062 UJ 0.39 UJ

SULFUR 3/3/2008 0.47 0.36 J 0.063 U 0.23 J 1 J

EUCLID 3/3/2008 0.063 U 0.16 J 0.063 U 0.063 UJ 0.24 UJ

SPRING 3/3/2008 0.061 U 0.2 J 0.061 U 0.077 J 0.29 UJ

KIONA 3/3/2008 0.14 0.12 0.062 U 0.062 UJ 0.89 J

KIONA REP 3/3/2008 0.14 0.092 0.061 U 0.061 UJ 0.81 J

MOXEE 3/24/2008 0.063 U 16 3.6 1.8 2.9

GRANGER 3/28/2008 0.079 23 1 0.65 J 1.8 J

SULFUR 3/24/2008 0.16 58 6.6 2.8 4.5

SULFUR REP 3/24/2008 0.14 56 7.3 3 4.1

SPRING 3/24/2008 0.12 J 211 7.3 2.8 7.1

Endosulfan 

I

Endosulfan 

Dieldrin Chlorpyrifos II

Endosulfan 

Sulfate

U 

U = not detected at or above reported value J = estimated na = not analyzed
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Collection

Field ID Date (ng/L) (ng/L) (ng/L) (ng/L) (ng/L) (ng/L)

HARRISON 1/9/2008 3.1 U 0.063 U 0.063 U 0.14 UJ 0.063 U 0.19 UJ

NACHES 1/9/2008 3.1 U 0.062 U 0.062 U 0.062 U 0.062 U 0.15 UJ

NACHES REP 1/9/2008 3.1 U 0.062 U 0.062 U 0.062 U 0.062 U 0.15 UJ

MOXEE 1/9/2008 3.1 U 0.063 U 0.063 U 0.063 U 0.063 U 0.19 UJ

PARKER 1/9/2008 3.2 U 0.064 U 0.064 U 0.22 UJ 0.064 U 0.21 UJ

GRANGER 1/10/2008 3.1 U 0.061 U 0.061 U 0.061 U 0.061 U 0.061 U

SULFUR 1/10/2008 3.1 U 0.061 U 0.061 U 0.061 U 0.061 U 0.15 UJ

EUCLID 1/10/2008 3.1 U 0.061 U 0.061 U 0.10 UJ 0.061 U 0.13 UJ

SPRING 1/10/2008 3.1 U 0.061 U 0.061 U 0.061 U 0.061 U 0.14 UJ

KIONA 1/10/2008 3.0 U 0.061 U 0.061 U 0.061 U 0.061 U 0.13 UJ

TRNSFR BLNK 1/9/2008 3.1 U 0.062 U 0.062 U 0.062 U 0.062 U 0.16 UJ

HARRISON 2/5/2008 3.1 U 0.061 U 0.061 U 0.061 U 0.061 U 0.061 U

NACHES 2/5/2008 3.1 U 0.063 U 0.063 U 0.063 U 0.063 U 0.063 U

MOXEE 2/5/2008 3 UJ 0.061 UJ 0.061 UJ 0.061 UJ 0.061 UJ 0.061 UJ

MOXEE REP 2/5/2008 3.1 U 0.061 U 0.061 U 0.061 U 0.061 U 0.061 U

PARKER 2/5/2008 3.1 UJ 0.063 UJ 0.063 UJ 0.063 UJ 0.063 UJ 0.063 UJ

GRANGER 2/6/2008 3 UJ 0.061 UJ 0.061 UJ 0.061 UJ 0.061 UJ 0.061 UJ

SULFUR 2/6/2008 3.1 UJ 0.063 UJ 0.063 UJ 0.063 UJ 0.063 UJ 0.063 UJ

EUCLID 2/6/2008 3.2 U 0.063 U 0.063 U 0.063 U 0.063 U 0.063 U

SPRING 2/6/2008 3.1 U 0.063 U 0.063 U 0.063 U 0.063 U 0.063 U

KIONA 2/6/2008 3.2 U 0.063 U 0.063 U 0.063 U 0.063 U 0.063 U

HARRISON 3/4/2008 3.1 U 0.061 U 0.061 U 0.061 U 0.061 U 0.061 U

NACHES 3/4/2008 3.1 U 0.061 U 0.061 U 0.061 U 0.061 U 0.061 U

MOXEE 3/4/2008 3.1 U 0.062 U 0.062 U 0.062 U 0.062 U 0.062 U

PARKER 3/4/2008 3.1 U 0.062 U 0.062 U 0.062 U 0.062 U 0.062 U

GRANGER 3/3/2008 3.1 U 0.062 U 0.062 U 0.062 U 0.062 U 0.12 UJ

SULFUR 3/3/2008 3.1 U 0.063 U 0.063 U 0.063 U 0.063 U 0.063 U

EUCLID 3/3/2008 3.1 U 0.063 U 0.063 U 0.063 U 0.063 U 0.063 U

SPRING 3/3/2008 3.1 U 0.061 U 0.061 U 0.061 U 0.061 U 0.061 U

KIONA 3/3/2008 3.1 U 0.062 U 0.062 U 0.062 U 0.062 U 0.062 U

KIONA REP 3/3/2008 3.1 U 0.061 U 0.061 U 0.061 U 0.061 U 0.061 U

MOXEE 3/24/2008 3.2 U 0.063 U 0.063 U 0.063 U 0.063 U 0.063 U

GRANGER 3/28/2008 3.1 U 0.062 U 0.062 U 0.062 U 0.062 U 0.062 U

SULFUR 3/24/2008 3.2 U 0.064 U 0.064 U 0.064 U 0.064 U 0.064 U

SULFUR REP 3/24/2008 3.1 U 0.063 U 0.063 U 0.063 U 0.063 U 0.063 U

SPRING 3/24/2008 3.2 U 0.063 U 0.063 U 0.063 U 0.063 U 0.063 U

Toxaphene Cis-Chlordane 

CisNonachlorTransChlordane TransNonachlorOxychlordane

 U = not detected at or above reported value J = estimated na = not analyzed
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Collection

Field ID Date (ng/L) (ng/L) (ng/L) (ng/L) (ng/L) (ng/L)

HARRISON 1/9/2008 0.063 U 0.063 U 0.063 UJ 0.063 U 0.063 U 0.063 U

NACHES 1/9/2008 0.062 U 0.062 U 0.062 UJ 0.062 U 0.062 U 0.062 U

NACHES REP 1/9/2008 0.062 U 0.062 U 0.062 UJ 0.062 U 0.062 U 0.062 U

MOXEE 1/9/2008 0.063 U 0.063 U 0.063 UJ 0.063 U 0.063 U 0.063 U

PARKER 1/9/2008 0.064 U 0.064 U 0.064 UJ 0.064 U 0.064 U 0.064 U

GRANGER 1/10/2008 0.095 UJ 0.061 U 0.061 UJ 0.061 U 0.061 U 0.061 U

SULFUR 1/10/2008 0.061 U 0.061 U 0.061 UJ 0.061 U 0.061 U 0.061 U

EUCLID 1/10/2008 0.061 U 0.061 U 0.061 UJ 0.061 U 0.061 U 0.061 U

SPRING 1/10/2008 0.061 U 0.061 U 0.061 UJ 0.061 U 0.061 U 0.061 U

KIONA 1/10/2008 0.061 U 0.061 U 0.061 UJ 0.061 U 0.061 U 0.061 U

TRNSFR BLNK 1/9/2008 0.062 U 0.062 U 0.062 UJ 0.062 U 0.062 U 0.062 U

HARRISON 2/5/2008 0.061 U 0.061 U 0.061 U 0.061 U 0.061 U 0.061 U

NACHES 2/5/2008 0.063 U 0.063 U 0.063 U 0.063 U 0.063 U 0.063 U

MOXEE 2/5/2008 0.061 UJ 0.061 UJ 0.061 UJ 0.061 UJ 0.088 UJ 0.061 UJ

MOXEE REP 2/5/2008 0.061 U 0.061 U 0.061 U 0.061 U 0.075 UJ 0.061 U

PARKER 2/5/2008 0.063 UJ 0.063 UJ 0.063 UJ 0.063 UJ 0.063 U 0.063 U

GRANGER 2/6/2008 0.061 UJ 0.061 UJ 0.061 UJ 0.061 UJ 0.061 UJ 0.41 J

SULFUR 2/6/2008 0.063 UJ 0.063 UJ 0.063 UJ 0.063 UJ 0.27 UJ 0.063 U

EUCLID 2/6/2008 0.063 U 0.063 U 0.063 U 0.063 U 0.063 U 0.063 U

SPRING 2/6/2008 0.063 U 0.063 U 0.063 U 0.063 U 0.1 UJ 0.075

KIONA 2/6/2008 0.063 U 0.063 U 0.063 U 0.063 U 0.067 UJ 0.22

HARRISON 3/4/2008 0.061 U 0.061 U 0.061 U 0.061 U 0.061 U 0.061 UJ

NACHES 3/4/2008 0.061 U 0.061 U 0.061 U 0.061 U 0.061 U 0.061 UJ

MOXEE 3/4/2008 0.062 U 0.062 U 0.062 U 0.062 U 0.062 U 0.062 UJ

PARKER 3/4/2008 0.062 U 0.072 UJ 0.062 U 0.062 U 0.062 U 0.062 UJ

GRANGER 3/3/2008 0.062 U 0.062 U 0.062 U 0.062 U 0.062 U 0.062 UJ

SULFUR 3/3/2008 0.063 U 0.063 U 0.063 U 0.063 U 0.063 U 0.063 UJ

EUCLID 3/3/2008 0.063 U 0.063 U 0.063 U 0.063 U 0.063 U 0.063 UJ

SPRING 3/3/2008 0.061 U 0.061 U 0.061 U 0.061 U 0.061 U 0.061 UJ

KIONA 3/3/2008 0.062 U 0.062 U 0.062 U 0.062 U 0.062 U 0.062 UJ

KIONA REP 3/3/2008 0.061 U 0.061 U 0.061 U 0.061 U 0.061 U 0.061 UJ

MOXEE 3/24/2008 0.063 U 0.063 U 0.063 UJ 0.063 U 0.063 U 0.063 U

GRANGER 3/28/2008 0.062 U 0.062 U 0.062 U 0.062 U 0.098 0.062 U

SULFUR 3/24/2008 0.064 U 0.064 U 0.064 UJ 0.064 U 0.12 0.064 U

SULFUR REP 3/24/2008 0.063 U 0.063 U 0.063 UJ 0.063 U 0.1 0.063 U

SPRING 3/24/2008 0.063 U 0.063 U 0.063 UJ 0.063 U 0.26 0.063 U

Alpha-BHC Beta-BHC Delta-BHC Lindane Aldrin Endrin

 U = not detected at or above reported value J = estimated na = not analyzed
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Collection

Field ID Date (ng/L) (ng/L) (ng/L) (ng/L) (ng/L)

HARRISON 1/9/2008 0.063 UJ 0.063 U 0.063 U 0.063 U 0.063 U

NACHES 1/9/2008 0.062 UJ 0.062 U 0.062 U 0.062 U 0.062 U

NACHES REP 1/9/2008 0.062 UJ 0.062 U 0.062 U 0.062 U 0.062 U

MOXEE 1/9/2008 0.063 UJ 0.063 U 0.063 U 0.063 U 0.063 U

PARKER 1/9/2008 0.064 UJ 0.064 U 0.064 U 0.064 U 0.064 U

GRANGER 1/10/2008 0.061 UJ 0.061 U 0.061 U 0.069 UJ 0.061 U

SULFUR 1/10/2008 0.061 UJ 0.061 U 0.061 U 0.061 U 0.061 U

EUCLID 1/10/2008 0.061 UJ 0.061 U 0.061 U 0.061 U 0.061 U

SPRING 1/10/2008 0.061 UJ 0.061 U 0.061 U 0.061 U 0.061 U

KIONA 1/10/2008 0.061 UJ 0.061 U 0.061 U 0.061 U 0.061 U

TRNSFR BLNK 1/9/2008 0.062 UJ 0.062 U 0.062 U 0.062 U 0.062 U

HARRISON 2/5/2008 0.061 U 0.061 U 0.061 U 0.061 U 0.061 U

NACHES 2/5/2008 0.063 U 0.063 U 0.063 U 0.063 U 0.063 U

MOXEE 2/5/2008 0.46 UJ 0.061 U 0.061 UJ 0.061 U 0.061 UJ

MOXEE REP 2/5/2008 0.46 UJ 0.061 U 0.061 U 0.061 U 0.061 U

PARKER 2/5/2008 0.063 U 0.063 U 0.063 UJ 0.063 U 0.063 UJ

GRANGER 2/6/2008 0.11 UJ 0.62 J 0.061 UJ 0.14 UJ 0.061 UJ

SULFUR 2/6/2008 0.21 UJ 0.063 U 0.063 UJ 0.063 U 0.063 UJ

EUCLID 2/6/2008 0.063 U 0.063 U 0.063 U 0.063 U 0.063 U

SPRING 2/6/2008 0.16 0.21 J 0.063 U 0.063 U 0.063 U

KIONA 2/6/2008 0.063 U 0.16 J 0.063 U 0.063 U 0.063 U

HARRISON 3/4/2008 0.061 U 0.061 U 0.061 U 0.061 U 0.061 U

NACHES 3/4/2008 0.061 U 0.061 U 0.061 U 0.061 U 0.061 U

MOXEE 3/4/2008 0.062 U 0.062 U 0.062 U 0.062 U 0.062 U

PARKER 3/4/2008 0.062 U 0.062 U 0.062 U 0.062 U 0.062 U

GRANGER 3/3/2008 0.11 UJ 0.069 UJ 0.062 U 0.062 U 0.062 U

SULFUR 3/3/2008 0.063 U 0.063 U 0.063 U 0.063 U 0.063 U

EUCLID 3/3/2008 0.063 U 0.063 U 0.063 U 0.063 U 0.063 U

SPRING 3/3/2008 0.061 U 0.061 U 0.061 U 0.061 U 0.061 U

KIONA 3/3/2008 0.062 U 0.062 U 0.062 U 0.062 U 0.062 U

KIONA REP 3/3/2008 0.061 U 0.069 UJ 0.061 U 0.061 U 0.061 U

MOXEE 3/24/2008 0.063 UJ 0.063 U 0.063 U 0.063 U 0.063 U

GRANGER 3/28/2008 0.062 UJ 0.097 UJ 0.062 U 0.062 U 0.062 U

SULFUR 3/24/2008 0.064 UJ 0.064 U 0.064 U 0.064 U 0.064 U

SULFUR REP 3/24/2008 0.063 UJ 0.063 U 0.063 U 0.063 U 0.063 U

SPRING 3/24/2008 0.063 UJ 0.063 U 0.063 U 0.063 U 0.063 U

Endrin 

Aldehyde Endrin Ketone Heptachlor

Heptachlor 

Epoxide

Hexachlorobenzene

 U = not detected at or above reported value J = estimated na = not analyzed
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Collection Conductivity

Field ID Date (ng/L) (mg/L) (mg/L) (NTU) (umhos/cm)

HARRISON 1/9/2008 0.063 U 2 na 1 144

NACHES 1/9/2008 0.062 U 2 na 1.5 87

NACHES REP 1/9/2008 0.062 U 2 U na 2 87.1

MOXEE 1/9/2008 0.23 UJ 13 na 4.4 792

PARKER 1/9/2008 0.064 U 3 na 1.7 144

GRANGER 1/10/2008 0.061 U 141 133 27 733

SULFUR 1/10/2008 0.22 80 71 28 J 771

EUCLID 1/10/2008 0.061 U 5 4 3.2 224

SPRING 1/10/2008 0.061 U 2 1 1.4 671

KIONA 1/10/2008 0.061 U 3 2 2.6 248

TRNSFR BLNK 1/9/2008 0.062 U na na na na

HARRISON 2/5/2008 0.061 UJ 4 3 1.1 J 142

NACHES 2/5/2008 0.063 UJ 2 1 1.8 J 93.1

MOXEE 2/5/2008 0.22 UJ 7 6 3.4 801

MOXEE REP 2/5/2008 0.31 UJ 6 4 3.4 796

PARKER 2/5/2008 0.084 UJ 5 4 2.5 144

GRANGER 2/6/2008 0.45 UJ 56 42 37 J 775

SULFUR 2/6/2008 0.063 UJ 42 37 24 J 766

EUCLID 2/6/2008 0.063 UJ 10 7 7.7 J 242

SPRING 2/6/2008 0.063 UJ 2 2 1.6 J 680

KIONA 2/6/2008 0.063 UJ 3 3 2.6 J 243

HARRISON 3/4/2008 0.061 UJ 6 5 3.7 149

NACHES 3/4/2008 0.061 UJ 4 3 4.4 104

MOXEE 3/4/2008 0.35 UJ 9 6 3.3 814

PARKER 3/4/2008 0.062 UJ 7 6 4.6 146

GRANGER 3/3/2008 0.078 UJ 47 44 5.7 735

SULFUR 3/3/2008 0.29 UJ 42 38 11 801

EUCLID 3/3/2008 0.063 UJ 22 19 11 180

SPRING 3/3/2008 0.067 UJ 23 20 14 189

KIONA 3/3/2008 0.062 UJ 1 1 U 0.7 660

KIONA REP 3/3/2008 0.061 UJ 1 1 U 0.6 661

MOXEE 3/24/2008 0.063 U 85 66 28 254

GRANGER 3/28/2008 0.17 UJ 156 134 90 J 626

SULFUR 3/24/2008 0.083 UJ 39 35 16 306

SULFUR REP 3/24/2008 0.063 U 48 44 14 299

SPRING 3/24/2008 0.063 U 28 24 13 231

Methoxychlor TSS TNVSS Turbidity

U = not detected at or above reported value J = estimated na = not analyzed
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Appendix K. Screening Survey Data for Surface Water, 2007-

08 

Collection Flow 4,4'-DDT 4,4'-DDE

Sample No. Field ID Date (cfs) (ng/L) (ng/L) (ng/L)

7204084 AHTANUM 5/16/2007 120 0.062 U 0.19 0.062 U

7204101 AMON 5/16/2007 48 0.063 U 0.14 0.063 U

7204099 CORRAL 5/16/2007 11 0.064 U 0.27 0.064 U

7204090 COULEE DR 5/17/2007 16 0.69 0.57 0.13

7234103 COWICHEE 6/4/2007 37 0.35 J 0.87 0.07 J

7204093 DID 7 5/16/2007 9.5 0.072 UJ 1.4 0.17

7204097 DRAIN 31 5/16/2007 3.4 0.25 1.3 0.13

7204086 EAST TOP 5/17/2007 31 0.33 0.65 0.13

7204096 GRANDVIEW 5/16/2007 11 0.48 2.0 0.19

7204088 MARION 5/16/2007 109 0.13 0.31 0.064

7204102 MARION REP 5/16/2007 - - 0.14 UJ 0.36 0.064 U

7204095 SATUS 302 5/17/2007 14 1.3 5.9 0.18

7204094 SATUS 303 5/17/2007 30 0.17 UJ 1.3 0.11

7204091 SATUS CK 5/17/2007 162 0.063 U 0.13 0.063 U

7204082 SELAH DCH 5/16/2007 6.0 0.32 1.7 0.55

7204092 SOUTH DR 5/17/2007 65 1.2 3.8 0.48

7204103 SOUTH DR REP 5/17/2007 - - 1.3 3.8 0.57

7204087 SUB 35 5/17/2007 47 1.2 1.3 0.40

7214100 TAYLOR D 5/22/2007 6.0 0.063 U 0.32 0.082

7204089 TOP CK 5/17/2007 69 0.078 0.25 0.061

7204098 WAUNA 5/16/2007 6.5 0.072 UJ 0.71 0.088

7214102 WENAS 5/22/2007 14 0.063 U 0.096 0.063 U

7204083 WIDE HOL 5/16/2007 13 0.1 0.97 0.39

7204085 ZILLAH 5/16/2007 2.6 0.5 2.9 0.46

 - - SELAH CR. dry

 - - COLD CR. dry

4,4'-DDD

U = not detected at or above reported value 

J = estimated 

REJ = rejected 

na = not analyzed 
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Collection

Field ID Date (ng/L) (ng/L) (ng/L) (ng/L) (ng/L)

AHTANUM 5/16/2007 0.062 U 0.6 0.47 0.3 0.75 J

AMON 5/16/2007 0.063 U 0.47 0.20 J 0.23 0.76

CORRAL 5/16/2007 0.077 UJ 1.3 J 0.15 0.12 J 1.2

COULEE DR 5/17/2007 0.062 U 4.5 0.28 UJ 0.31 0.76 J

COWICHEE 6/4/2007 0.081 UJ 1.0 0.25 0.27 0.48 J

DID 7 5/16/2007 0.077 UJ 3.4 0.24 0.13 J 0.83 J

DRAIN 31 5/16/2007 0.36 1.3 0.53 0.38 J 1.3 J

EAST TOP 5/17/2007 0.25 0.68 1.4 1.0 1.4 J

GRANDVIEW 5/16/2007 0.32 18 0.58 0.39 1.3 J

MARION 5/16/2007 0.13 15 0.55 UJ 0.65 1.1 J

MARION REP 5/16/2007 0.12 J 16 0.44 0.62 1.3

SATUS 302 5/17/2007 1.5 7.6 0.16 J 0.34 J 1.4 J

SATUS 303 5/17/2007 0.17 J 4.2 0.27 0.23 J 1.2 J

SATUS CK 5/17/2007 0.063 U 4.3 0.24 0.16 0.4 UJ

SELAH DCH 5/16/2007 0.13 J 1.4 0.46 UJ 0.33 1.1 J

SOUTH DR 5/17/2007 0.17 3.2 0.33 0.23 J 1.1

SOUTH DR REP 5/17/2007 0.2 8.1 0.36 0.49 J 1.3

SUB 35 5/17/2007 0.15 3.9 0.33 UJ 0.42 0.94 J

TAYLOR D 5/22/2007 0.063 U 0.3 J 0.097 UJ 0.063 U 0.65

TOP CK 5/17/2007 0.13 J 7.9 0.48 UJ 0.62 1.1 J

WAUNA 5/16/2007 0.063 U 1.9 0.76 0.49 2.5 J

WENAS 5/22/2007 0.063 U 0.093 0.063 U 0.063 U 0.36

WIDE HOL 5/16/2007 0.47 2.1 J 1.1 0.85 7.0 J

ZILLAH 5/16/2007 0.4 UJ 1.8 0.89 1.2 2.4 J

SELAH CR. dry

COLD CR. dry

Endosulfan 

I

Endosulfan 

II

Endosulfan 

Dieldrin Chlorpyrifos Sulfate

U = not detected at or above reported value 

J = estimated 

REJ = rejected 

na = not analyzed 
Yakima Pesticides/PCBs TMDL: Vol 1, WQ Study Findings 

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Collection

Field ID Date (ng/L) (ng/L) (ng/L) (ng/L) (ng/L) (ng/L)

AHTANUM 5/16/2007 3.1 U 0.062 U 0.062 U 0.062 U 0.062 U 0.062 U

AMON 5/16/2007 3.1 U 0.063 U 0.063 U 0.063 U 0.063 U 0.063 U

CORRAL 5/16/2007 3.2 U 0.064 U 0.064 U 0.064 U 0.064 U 0.064 U

COULEE DR 5/17/2007 3.1 U 0.062 U 0.062 U 0.062 U 0.062 U 0.062 U

COWICHEE 6/4/2007 3.1 U 0.063 U 0.063 U 0.063 U 0.063 U 0.063 U

DID 7 5/16/2007 3.1 U 0.062 U 0.062 U 0.062 U 0.062 U 0.062 U

DRAIN 31 5/16/2007 3.1 U 0.063 U 0.063 U 0.063 U 0.063 U 0.063 U

EAST TOP 5/17/2007 3.1 U 0.062 U 0.062 U 0.062 U 0.07 U 0.062 U

GRANDVIEW 5/16/2007 3.1 U 0.063 U 0.063 U 0.063 U 0.063 U 0.063 U

MARION 5/16/2007 3.1 U 0.062 U 0.062 U 0.062 U 0.062 U 0.062 U

MARION REP 5/16/2007 3.2 U 0.064 U 0.064 U 0.064 U 0.064 U 0.064 U

SATUS 302 5/17/2007 3.1 U 0.063 U 0.063 U 0.063 U 0.063 U 0.063 U

SATUS 303 5/17/2007 3.0 U 0.061 U 0.061 U 0.061 U 0.061 U 0.061 U

SATUS CK 5/17/2007 3.2 U 0.063 U 0.063 U 0.063 U 0.063 U 0.063 U

SELAH DCH 5/16/2007 3.3 U 0.065 U 0.065 U 0.065 U 0.065 U 0.065 U

SOUTH DR 5/17/2007 3.1 U 0.063 U 0.063 U 0.063 U 0.063 U 0.063 U

SOUTH DR REP 5/17/2007 3.1 U 0.063 U 0.063 U 0.063 U 0.063 U 0.063 U

SUB 35 5/17/2007 3.1 U 0.062 U 0.062 U 0.062 U 0.062 U 0.062 U

TAYLOR D 5/22/2007 3.2 U 0.063 U 0.063 U 0.063 U 0.063 U 0.063 U

TOP CK 5/17/2007 3.0 U 0.061 U 0.061 U 0.061 U 0.061 U 0.061 U

WAUNA 5/16/2007 3.2 U 0.063 U 0.063 U 0.063 U 0.063 U 0.063 U

WENAS 5/22/2007 3.2 U 0.063 U 0.063 U 0.063 U 0.063 U 0.063 U

WIDE HOL 5/16/2007 3.2 U 0.063 U 0.063 U 0.063 U 0.063 U 0.063 U

ZILLAH 5/16/2007 3.1 U 0.062 U 0.062 U 0.062 U 0.062 U 0.062 U

SELAH CR. dry

COLD CR. dry

Toxaphene

CisChlordane CisNonachlorTransChlordaneTransNonachlorOxychlordane

U = not detected at or above reported value 

J = estimated 

REJ = rejected 

na = not analyzed 
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Collection

Field ID Date (ng/L) (ng/L) (ng/L) (ng/L) (ng/L) (ng/L)

AHTANUM 5/16/2007 0.062 U 0.062 U 0.062 U 0.062 U 0.062 UJ 0.062 UJ

AMON 5/16/2007 0.063 U 0.063 U 0.063 U 0.063 U 0.063 UJ 0.063 U

CORRAL 5/16/2007 0.064 U 0.064 U 0.064 U 0.064 U 0.064 UJ 0.064 U

COULEE DR 5/17/2007 0.062 U 0.062 U 0.062 U 0.062 U 0.21 UJ 0.062 U

COWICHEE 6/4/2007 0.063 U 0.063 UJ 0.063 U 0.063 UJ 0.063 U 0.063 U

DID 7 5/16/2007 0.062 U 0.062 U 0.062 U 0.062 U 0.062 UJ 0.062 U

DRAIN 31 5/16/2007 0.063 U 0.063 U 0.063 U 0.063 U 0.063 UJ 0.063 U

EAST TOP 5/17/2007 0.062 U 0.062 U 0.062 U 0.12 UJ 0.062 UJ 0.071 UJ

GRANDVIEW 5/16/2007 0.063 U 0.063 U 0.063 U 0.063 U 0.063 UJ 0.063 U

MARION 5/16/2007 0.062 U 0.062 U 0.062 U 0.062 U 0.075 UJ 0.092 UJ

MARION REP 5/16/2007 0.064 U 0.064 U 0.064 U 0.064 U 0.11 UJ 0.79 UJ

SATUS 302 5/17/2007 0.063 U 0.063 U 0.063 U 0.17 UJ 0.094 UJ 0.09 UJ

SATUS 303 5/17/2007 0.061 U 0.061 U 0.061 U 0.061 U 0.1 UJ 0.061 U

SATUS CK 5/17/2007 0.063 U 0.063 U 0.063 U 0.063 U 0.063 UJ 0.063 U

SELAH DCH 5/16/2007 0.065 U 0.098 UJ 0.065 U 0.069 UJ 0.065 UJ 0.094 UJ

SOUTH DR 5/17/2007 0.063 U 0.063 U 0.063 U 0.063 U 0.063 UJ 0.063 U

SOUTH DR REP 5/17/2007 0.063 U 0.063 U 0.063 U 0.063 U 0.19 UJ 0.063 U

SUB 35 5/17/2007 0.062 U 0.062 U 0.062 U 0.062 U 0.10 UJ 0.11 UJ

TAYLOR D 5/22/2007 0.063 U 0.12 UJ 0.063 U 0.063 U 0.063 U 0.063 U

TOP CK 5/17/2007 0.061 U 0.061 U 0.061 U 0.061 U 0.098 UJ 0.11 UJ

WAUNA 5/16/2007 0.063 U 0.063 U 0.063 U 0.063 U 0.063 UJ 0.75 UJ

WENAS 5/22/2007 0.063 U 0.063 U 0.063 U 0.063 U 0.063 U 0.063 U

WIDE HOL 5/16/2007 0.063 U 0.063 U 0.063 U 0.063 U 0.063 UJ 0.14 UJ

ZILLAH 5/16/2007 0.062 U 0.062 U 0.062 U 0.062 U 0.062 UJ 0.062 U

SELAH CR. dry

COLD CR. dry

Endrin

AlphaBHCBetaBHCDeltaBHC Lindane Aldrin

U = not detected at or above reported value 

J = estimated 

REJ = rejected 

na = not analyzed 
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Collection

Field ID Date (ng/L) (ng/L) (ng/L) (ng/L) (ng/L)

AHTANUM 5/16/2007 0.062 U 0.062 U 0.062 U 0.062 U 0.062 U

AMON 5/16/2007 0.063 U 0.063 U 0.063 U 0.063 U 0.063 U

CORRAL 5/16/2007 0.064 U 0.064 U 0.064 U 0.064 U 0.064 U

COULEE DR 5/17/2007 0.062 U 0.062 U 0.062 U 0.062 U 0.062 U

COWICHEE 6/4/2007 0.10 UJ 0.063 U 0.063 U 0.063 U 0.063 U

DID 7 5/16/2007 0.15 UJ 0.062 U 0.062 U 0.062 U 0.062 U

DRAIN 31 5/16/2007 0.083 UJ 0.063 U 0.063 U 0.071 0.063 U

EAST TOP 5/17/2007 0.062 UJ 0.062 U 0.062 U 0.062 0.062 U

GRANDVIEW 5/16/2007 0.082 UJ 0.063 U 0.063 U 0.063 U 0.063 U

MARION 5/16/2007 0.062 U 0.062 U 0.062 U 0.062 U 0.062 U

MARION REP 5/16/2007 0.064 U 0.064 U 0.064 U 0.064 U 0.064 U

SATUS 302 5/17/2007 0.065 UJ 0.063 U 0.063 U 0.10 0.063 U

SATUS 303 5/17/2007 0.10 UJ 0.061 U 0.061 U 0.061 U 0.061 U

SATUS CK 5/17/2007 0.14 UJ 0.063 U 0.063 U 0.063 U 0.063 U

SELAH DCH 5/16/2007 0.11 UJ 0.065 U 0.065 U 0.065 U 0.065 U

SOUTH DR 5/17/2007 0.078 UJ 0.063 U 0.063 U 0.063 U 0.063 U

SOUTH DR REP 5/17/2007 0.073 UJ 0.063 U 0.063 U 0.063 U 0.063 U

SUB 35 5/17/2007 0.062 U 0.062 U 0.062 U 0.062 U 0.062 U

TAYLOR D 5/22/2007 0.063 U 0.063 UJ 0.063 U 0.063 U 0.063 U

TOP CK 5/17/2007 0.078 UJ 0.061 U 0.061 U 0.061 U 0.061 U

WAUNA 5/16/2007 0.087 UJ 0.063 U 0.063 U 0.063 U 0.063 U

WENAS 5/22/2007 0.09 UJ 0.063 U 0.063 U 0.063 U 0.063 U

WIDE HOL 5/16/2007 0.063 U 0.063 U 0.063 U 0.063 U 0.14 J

ZILLAH 5/16/2007 0.087 UJ 0.1 UJ 0.062 U 0.087 J 0.062 U

SELAH CR. dry

COLD CR. dry

Endrin 

Aldehyde

Endrin 

Ketone Heptachlor

Heptachlor 

Epoxide

Hexachlorobenzene

U = not detected at or above reported value 

J = estimated 

REJ = rejected 

na = not analyzed 
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Collection

Field ID Date (ng/L) (mg/L) (NTU) (umhos/cm)

AHTANUM 5/16/2007 0.062 UJ 27 12 130

AMON 5/16/2007 0.063 UJ 23 6.3 312

CORRAL 5/16/2007 0.064 UJ 18 5.7 454

COULEE DR 5/17/2007 0.062 UJ 9 12 274

COWICHEE 6/4/2007 0.33 UJ 44 16 164

DID 7 5/16/2007 0.062 UJ 60 35 350

DRAIN 31 5/16/2007 0.063 UJ 16 11 260

EAST TOP 5/17/2007 0.062 UJ 29 15 186

GRANDVIEW 5/16/2007 0.063 UJ 31 12 174

MARION 5/16/2007 0.062 UJ 13 9.2 233

MARION REP 5/16/2007 0.064 UJ 66 9.2 233

SATUS 302 5/17/2007 0.063 UJ 173 80 279

SATUS 303 5/17/2007 0.061 UJ 47 21 182

SATUS CK 5/17/2007 0.063 UJ 12 6.3 203

SELAH DCH 5/16/2007 0.37 UJ 8 3.8 683

SOUTH DR 5/17/2007 0.46 UJ 92 38 318

SOUTH DR REP 5/17/2007 0.063 UJ 100 40 319

SUB 35 5/17/2007 0.29 UJ 37 20 270

TAYLOR D 5/22/2007 0.063 UJ 16 9.0 421

TOP CK 5/17/2007 0.061 UJ 7 6.8 248

WAUNA 5/16/2007 0.063 UJ 43 19 222

WENAS 5/22/2007 0.21 UJ 10 4 198

WIDE HOL 5/16/2007 0.063 UJ 5 4.2 307

ZILLAH 5/16/2007 0.062 UJ 45 19 160

SELAH CR. dry

COLD CR. dry

Methoxychlor

Total 

Suspended 

Solids Turbidity Conductivity

U = not detected at or above reported value 

J = estimated 

REJ = rejected 

na = not analyzed 
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Collection Flow

Sample No. Field ID Date (cfs) (ng/L) (ng/L) (ng/L)

7334084 AHTANUM 8/14/2007 26 0.062 UJ 0.062 UJ 0.062 UJ

7334101 AMON 8/16/2007 49 0.062 UJ 0.091 J 0.062 UJ

7334099 CORRAL 8/16/2007 13 0.064 UJ 0.25 J 0.064 UJ

7334090 COULEE DR 8/15/2007 37 0.12 0.36 0.099

7334104 COWICHEE 8/14/2007 2 0.35 0.93 0.21

7334093 DID7 8/16/2007 20 0.061 UJ 0.65 J 0.11 J

7334097 DRAIN 31 8/16/2007 3 0.41 J 1.4 J 0.14 J

7334086 EAST TOP 8/15/2007 15 0.22 0.58 0.21

7334096 GRANDVIEW 8/16/2007 16 0.64 J 2.3 J 0.23 J

7334088 MARION 8/15/2007 54 0.062 U 0.25 0.066

7334103 SAT302REP 8/15/2007 - - 1.3 5.1 0.14

7334095 SATUS 302 8/15/2007 26 1.3 5.2 0.15

7334094 SATUS 303 8/15/2007 6.6 0.49 2.5 0.22

7334091 SATUS CK 8/15/2007 61 0.065 U 0.13 0.065 U

7334082 SELAH DCH 8/14/2007 6.6 0.46 2.0 0.70

7334092 SOUTH DR 8/15/2007 61 0.79 3.5 0.46

7334087 SUB 35 8/15/2007 60 0.57 0.75 0.25

7334100 TAYLOR D 8/14/2007 1.4 0.062 U 0.30 0.10

7334089 TOP CK 8/15/2007 40 0.063 U 0.16 0.063 U

7334098 WAUNA 8/16/2007 1.6 0.063 UJ 0.25 J 0.063 UJ

7334081 WENAS 8/14/2007 1.9 0.063 U 0.096 0.063 U

7334083 WIDE HOL 8/14/2007 9.6 0.087 1.1 0.38

7334102 WIDE REP 8/14/2007 - - 0.091 1.1 0.39

7334085 ZILLAH 8/15/2007 2.6 0.2 2.5 0.55

 - - SELAH CR. dry

 - - COLD CR. dry

4,4'-DDT 4,4'-DDE 4,4'-DDD

U = not detected at or above reported value 

J = estimated 

REJ = rejected 

na = not analyzed 
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U = not detected at or above reported value 

J = estimated 

REJ = rejected 

na = not analyzed 

Field ID

Collection 

Date

AHTANUM 8/14/2007 REJ REJ 0.062 UJ REJ 0.062 UJ

AMON 8/16/2007 0.12 J 1.1 J 0.19 J 0.17 J 0.78 J

CORRAL 8/16/2007 0.064 UJ 0.32 J 0.25 J 0.064 UJ 0.68 J

COULEE DR 8/15/2007 0.061 U 21 0.12 0.14 J 0.61

COWICHEE 8/14/2007 0.063 0.063 U 0.25 0.25 0.94

DID7 8/16/2007 0.061 UJ 0.061 UJ 0.37 J 0.16 J 0.91 J

DRAIN 31 8/16/2007 1.7 0.58 J 0.75 J 0.5 J 1.4 J

EAST TOP 8/15/2007 0.14 UJ 0.67 0.34 J 0.41 0.99

GRANDVIEW 8/16/2007 0.55 J 0.62 J 1.5 J 0.56 J 1.5 J

MARION 8/15/2007 0.15 J 4.8 0.23 0.17 0.87

SAT302REP 8/15/2007 1.8 4.3 0.2 0.22 1.1

SATUS 302 8/15/2007 1.9 7.6 0.19 0.28 1.1

SATUS 303 8/15/2007 0.31 2.1 0.17 0.061 U 0.99

SATUS CK 8/15/2007 0.079 J 10 0.19 0.12 0.57

SELAH DCH 8/14/2007 0.062 U 0.15 UJ 7.1 5.0 5.8

SOUTH DR 8/15/2007 0.57 2.1 0.2 0.18 1.0

SUB 35 8/15/2007 0.27 12 0.2 0.21 0.94

TAYLOR D 8/14/2007 0.062 U 0.81 0.36 0.1 J 0.57

TOP CK 8/15/2007 0.11 J 3.7 0.2 0.21 0.93

WAUNA 8/16/2007 0.088 J 0.71 J 0.54 J 0.29 J 1.4 J

WENAS 8/14/2007 0.063 U 0.13 J 0.081 0.088 UJ 0.49

WIDE HOL 8/14/2007 0.47 0.32 J 0.35 0.53 2.6

WIDE REP 8/14/2007 0.51 0.31 0.38 0.56 3.1

ZILLAH 8/15/2007 0.11 J 0.51 2.2 0.38 1.6

SELAH CR. dry

COLD CR. dry

Endosulfan 

Sulfate 

(ng/L)

Endosulfan 

II 

(ng/L)

Endosulfan 

I 

(ng/l)

Chlorpyriphos 

(ng/L)

Dieldrin 

(ng/L)
Yakima Pesticides/PCBs TMDL: Vol 1, WQ Study Findings 

Page 269 

U = not detected at or above reported value 

J = estimated 

REJ = rejected 

na = not analyzed 

Field ID

Collection 

Date

AHTANUM 8/14/2007 3.1 U 0.062 UJ 0.062 UJ 0.062 UJ 0.062 UJ 0.062 UJ

AMON 8/16/2007 3.1 U 0.062 UJ 0.062 UJ 0.062 UJ 0.062 UJ 0.062 UJ

CORRAL 8/16/2007 3.2 UJ 0.064 UJ 0.064 UJ 0.064 UJ 0.064 UJ 0.064 UJ

COULEE DR 8/15/2007 3.0 U 0.061 U 0.061 U 0.061 U 0.061 U 0.061 U

COWICHEE 8/14/2007 3.1 U 0.063 U 0.063 U 0.063 U 0.063 U 0.063 U

DID7 8/16/2007 3.1 UJ 0.061 UJ 0.061 UJ 0.061 UJ 0.061 UJ 0.061 UJ

DRAIN 31 8/16/2007 3.2 UJ 0.064 UJ 0.064 UJ 0.064 UJ 0.064 J 0.064 UJ

EAST TOP 8/15/2007 3.1 U 0.09 J 0.063 U 0.10 UJ 0.098 UJ 0.14 UJ

GRANDVIEW 8/16/2007 3.1 UJ 0.063 UJ 0.063 UJ 0.063 UJ 0.063 UJ 0.063 UJ

MARION 8/15/2007 3.1 U 0.062 U 0.062 U 0.062 U 0.062 U 0.062 U

SAT302REP 8/15/2007 3.1 U 0.062 U 0.062 U 0.062 U 0.062 U 0.062 U

SATUS 302 8/15/2007 3.0 U 0.061 U 0.061 U 0.061 U 0.061 U 0.061 U

SATUS 303 8/15/2007 3.0 U 0.061 U 0.061 U 0.061 U 0.061 U 0.061 U

SATUS CK 8/15/2007 3.2 U 0.065 U 0.065 U 0.065 U 0.065 U 0.065 U

SELAH DCH 8/14/2007 3.1 U 0.062 U 0.062 U 0.062 U 0.062 U 0.073 UJ

SOUTH DR 8/15/2007 3.1 U 0.061 U 0.061 U 0.061 U 0.061 U 0.061 U

SUB 35 8/15/2007 3.1 U 0.063 U 0.063 U 0.063 U 0.063 U 0.063 U

TAYLOR D 8/14/2007 3.1 U 0.13 J 0.062 U 0.062 U 0.062 U 0.062 U

TOP CK 8/15/2007 3.2 U 0.063 U 0.063 U 0.063 U 0.063 U 0.063 U

WAUNA 8/16/2007 3.1 UJ 0.063 UJ 0.063 UJ 0.063 UJ 0.063 UJ 0.34 J

WENAS 8/14/2007 3.1 U 0.063 U 0.063 U 0.063 U 0.063 U 0.063 U

WIDE HOL 8/14/2007 3.2 U 0.081 J 0.063 U 0.063 U 0.074 0.063 U

WIDE REP 8/14/2007 3.2 U 0.08 J 0.063 U 0.063 U 0.063 U 0.063 U

ZILLAH 8/15/2007 3.1 U 0.063 U 0.063 U 0.063 U 0.063 U 0.063 U

SELAH CR. dry

COLD CR. dry

Toxaphene 

(ng/L)

Oxychlordane 

(ng/L)

TransNonachlor 

(ng/L)

TransChlordane 

(ng/L))

CisNonachlor 

(ng/L)

CisChlordane 

(ng/L)
Yakima Pesticides/PCBs TMDL: Vol 1, WQ Study Findings 

Page 270 

U = not detected at or above reported value 

J = estimated 

REJ = rejected 

na = not analyzed 

Field ID

Collection 

Date

AHTANUM 8/14/2007 0.062 UJ 0.062 UJ 0.062 UJ 0.062 UJ 0.062 UJ REJ

AMON 8/16/2007 0.062 UJ 0.062 UJ 0.062 UJ 0.062 UJ 0.062 UJ 0.062 UJ

CORRAL 8/16/2007 0.064 UJ 0.064 UJ 0.064 UJ 0.064 UJ 0.064 UJ 0.064 UJ

COULEE DR 8/15/2007 0.061 U 0.061 U 0.061 U 0.061 U 0.078 UJ 0.73

COWICHEE 8/14/2007 0.063 U 0.063 U 0.063 U 0.063 U 0.063 UJ 0.063 UJ

DID7 8/16/2007 0.061 UJ 0.061 UJ 0.061 UJ 0.061 UJ 0.27 UJ 0.11 UJ

DRAIN 31 8/16/2007 0.064 UJ 0.064 UJ 0.064 UJ 0.064 UJ 0.064 UJ 0.36 UJ

EAST TOP 8/15/2007 0.063 U 0.063 U 0.063 U 0.063 U 0.068 UJ 0.063 U

GRANDVIEW 8/16/2007 0.063 UJ 0.063 UJ 0.063 UJ 0.063 UJ 0.063 UJ 0.095 UJ

MARION 8/15/2007 0.062 U 0.062 U 0.062 U 0.062 U 0.096 UJ 0.14 UJ

SAT302REP 8/15/2007 0.062 U 0.062 U 0.062 U 0.062 U 0.13 UJ 0.69 J

SATUS 302 8/15/2007 0.061 U 0.061 U 0.061 U 0.061 U 0.11 UJ 0.64

SATUS 303 8/15/2007 0.061 U 0.061 U 0.061 U 0.061 U 0.061 U 0.061 U

SATUS CK 8/15/2007 0.065 U 0.065 U 0.065 U 0.065 U 0.092 UJ 0.47 J

SELAH DCH 8/14/2007 0.062 U 0.062 U 0.065 UJ 0.062 U 0.062 U 0.062 U

SOUTH DR 8/15/2007 0.061 U 0.061 U 0.061 U 0.061 U 0.09 UJ 0.67

SUB 35 8/15/2007 0.063 U 0.063 U 0.063 U 0.063 U 0.17 UJ 0.17 UJ

TAYLOR D 8/14/2007 0.062 U 0.13 UJ 0.062 U 0.062 U 0.062 UJ 0.062 UJ

TOP CK 8/15/2007 0.063 U 0.063 U 0.063 U 0.063 U 0.11 UJ 0.8 J

WAUNA 8/16/2007 0.063 UJ 0.063 UJ 0.063 UJ 0.063 UJ 0.063 UJ 0.19 UJ

WENAS 8/14/2007 0.063 U 0.063 U 0.063 U 0.063 U 0.063 U 0.063 U

WIDE HOL 8/14/2007 0.063 U 0.063 U 0.063 U 0.063 U 0.063 U 0.14 J

WIDE REP 8/14/2007 0.063 U 0.063 U 0.063 U 0.063 U 0.063 UJ 0.15 J

ZILLAH 8/15/2007 0.063 U 0.063 U 0.063 U 0.063 U 0.063 U 0.063 U

SELAH CR. dry

COLD CR. dry

AlphaBHC 

(ng/L)

BetaBHC 

(ng/L)

DeltaBHC 

(ng/L)

Lindane 

(ng/L)

Aldrin 

(ng/L)

Endrin 

(ng/L)
Yakima Pesticides/PCBs TMDL: Vol 1, WQ Study Findings 

Page 271 

U = not detected at or above reported value 

J = estimated 

REJ = rejected 

na = not analyzed 

Field ID

Collection 

Date

AHTANUM 8/14/2007 REJ REJ 0.062 UJ REJ 0.062 UJ

AMON 8/16/2007 0.062 UJ 0.062 UJ 0.062 UJ 0.062 UJ 0.062 UJ

CORRAL 8/16/2007 0.064 UJ 0.064 UJ 0.064 UJ 0.064 UJ 0.064 UJ

COULEE DR 8/15/2007 0.061 U 0.061 U 0.061 U 0.061 U 0.061 U

COWICHEE 8/14/2007 0.12 UJ 0.063 U 0.063 U 0.095 UJ 0.063 U

DID7 8/16/2007 0.061 UJ 0.061 UJ 0.061 UJ 0.061 UJ 0.061 UJ

DRAIN 31 8/16/2007 0.076 UJ 0.064 UJ 0.064 UJ 0.064 UJ 0.064 UJ

EAST TOP 8/15/2007 0.063 U 0.063 U 0.063 U 0.063 U 0.063 U

GRANDVIEW 8/16/2007 0.087 UJ 0.063 UJ 0.063 UJ 0.063 UJ 0.063 UJ

MARION 8/15/2007 0.062 U 0.062 U 0.062 U 0.062 0.062 U

SAT302REP 8/15/2007 0.12 UJ 0.062 U 0.062 U 0.062 UJ 0.062 U

SATUS 302 8/15/2007 0.061 U 0.061 U 0.061 U 0.061 U 0.061 U

SATUS 303 8/15/2007 0.061 U 0.061 U 0.061 U 0.061 U 0.061 U

SATUS CK 8/15/2007 0.065 U 0.065 U 0.065 U 0.065 U 0.065 U

SELAH DCH 8/14/2007 0.062 U 0.062 U 0.062 U 0.064 J 0.062 U

SOUTH DR 8/15/2007 0.061 U 0.061 U 0.061 U 0.061 U 0.061 U

SUB 35 8/15/2007 0.063 U 0.063 U 0.063 U 0.063 U 0.063 U

TAYLOR D 8/14/2007 0.062 U 0.28 0.062 U 0.062 UJ 0.062 U

TOP CK 8/15/2007 0.063 U 0.063 U 0.063 U 0.063 U 0.063 U

WAUNA 8/16/2007 0.063 UJ 0.063 UJ 0.063 UJ 0.077 J 0.063 UJ

WENAS 8/14/2007 0.063 U 0.063 U 0.063 U 0.063 U 0.063 U

WIDE HOL 8/14/2007 0.063 U 0.063 U 0.063 U 0.07 J 0.28

WIDE REP 8/14/2007 0.067 UJ 0.063 U 0.063 U 0.096 J 0.29

ZILLAH 8/15/2007 0.063 UJ 0.063 U 0.063 U 0.07 UJ 0.063 U

SELAH CR. dry

COLD CR. dry

Hexachlorobenzene 

(ng/L)

Heptachlor 

Epoxide 

(ng/L)

Heptachlor 

(ng/L)

Endrin 

Ketone 

(ng/L)

Endrin 

Aldehyde 

(ng/L)
Yakima Pesticides/PCBs TMDL: Vol 1, WQ Study Findings 

Page 272 

U = not detected at or above reported value 

J = estimated 

REJ = rejected 

na = not analyzed 

Field ID

Collection 

Date

AHTANUM 8/14/2007 REJ 6 3.4 237

AMON 8/16/2007 0.062 UJ 18 5.1 380

CORRAL 8/16/2007 0.064 UJ 30 9.4 436

COULEE DR 8/15/2007 0.061 U 4 2.8 290

COWICHEE 8/14/2007 0.063 UJ 3 2.7 294

DID7 8/16/2007 0.061 UJ 20 14 351

DRAIN 31 8/16/2007 1.2 UJ 7 4.3 268

EAST TOP 8/15/2007 0.063 U 13 9.8 255

GRANDVIEW 8/16/2007 0.063 UJ 27 11 176

MARION 8/15/2007 0.062 U 11 6 247

SAT302REP 8/15/2007 1 UJ 85 40 282

SATUS 302 8/15/2007 0.061 UJ 73 45 282

SATUS 303 8/15/2007 0.061 U 6 4.4 368

SATUS CK 8/15/2007 0.065 U 5 4.9 332

SELAH DCH 8/14/2007 0.062 U 6 2.7 544

SOUTH DR 8/15/2007 0.061 U 25 16 366

SUB 35 8/15/2007 0.063 U 10 8.7 284

TAYLOR D 8/14/2007 0.062 UJ 6 4.3 386

TOP CK 8/15/2007 0.063 U 4 4.2 235

WAUNA 8/16/2007 0.063 UJ 4 3.9 193

WENAS 8/14/2007 0.063 U 5 3.3 510

WIDE HOL 8/14/2007 0.15 UJ 4 2.4 263

WIDE REP 8/14/2007 0.063 UJ 4 2.3 263

ZILLAH 8/15/2007 0.063 U 47 13 164

SELAH CR. dry

COLD CR. dry

Conductivity 

(umhos/cm)

Total 

Suspended 

Solids 

(mg/L)

Turbidity 

(NTU)

Methoxychlor 

(ng/L)
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Collection Flow 4,4'-DDT

Sample No. Field ID Date (cfs) (ng/L) (ng/L) (ng/L)

7464084 AHTANUM 11/15/2007 27 0.061 UJ 0.14 0.061 U

7464101 AMON CK 11/13/2007 19 0.066 U 0.066 U 0.066 U

7464099 CORRAL 11/13/2007 7.8 0.063 U 0.063 U 0.063 U

7464090 COULEE DR 11/14/2007 <1 est. 0.063 U 0.15 0.063 U

7464104 COWICHEE 11/15/2007 10 0.068 J 0.27 0.08

7464093 DID 7 11/13/2007 6.0 0.064 U 0.41 0.078

7464097 DRAIN 31 11/13/2007 0.5 0.064 U 0.41 0.064 U

7464086 EAST TOP 11/14/2007 21 0.064 U 0.58 0.24

7464096 GRANDVIEW 11/13/2007 8.8 0.29 3.1 0.49

7464088 MARION 11/14/2007 222 0.067 U 0.27 0.067 U

7464094 SATUS 303 11/13/2007 0.99 0.066 U 0.28 0.066 U

7464091 SATUS CK 11/13/2007 29 0.066 U 0.066 U 0.066 U

7484082 SELAH DC H 11/26/2007 9.6 0.51 J 6.1 1.3

7464092 SOUTH DR 11/13/2007 9.2 0.063 U 0.83 0.16

7464102 SOUTH REP 11/13/2007 - - 0.063 U 0.82 0.16

7464087 SUB 35 11/14/2007 23 0.16 0.56 0.28

7464100 TAYLOR D 11/15/2007 7.5 0.063 UJ 0.16 0.063 U

7464089 TOP CK 11/14/2007 48 0.064 U 0.13 0.064 U

7464081 WENAS 11/15/2007 5.4 0.063 UJ 0.064 0.063 U

7464083 WIDE HOL 11/15/2007 22 0.062 UJ 1.2 0.33

7464103 WIDE REP 11/15/2007 - - 0.063 UJ 0.98 0.26

7464085 ZILLAH 11/14/2007 0.3 0.067 U 0.82 0.22

 - - SATUS 302 standing water 

 - - SELAH CR. dry

 - - COLD CR. dry

4,4'-DDE 4,4'-DDD

U = not detected at or above reported value 

J = estimated 

REJ = rejected 

na = not analyzed 
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Collection

Field ID Date (ng/L) (ng/L) (ng/L) (ng/L) (ng/L)

AHTANUM 11/15/2007 0.061 U 0.061 UJ 0.061 U 0.086 J 0.2 J

AMON CK 11/13/2007 0.066 U 0.074 J 0.066 U 0.066 UJ 0.12 UJ

CORRAL 11/13/2007 0.063 U 0.063 UJ 0.063 U 0.063 UJ 0.18 J

COULEE DR 11/14/2007 0.063 U 0.46 J 0.063 U 0.063 UJ 0.067 UJ

COWICHEE 11/15/2007 0.061 U 0.061 UJ 0.061 U 0.12 J 0.30 J

DID 7 11/13/2007 0.064 U 0.072 J 0.064 U 0.064 UJ 0.13 UJ

DRAIN 31 11/13/2007 0.22 0.068 J 0.064 U 0.064 U 0.064 UJ

EAST TOP 11/14/2007 0.39 0.064 UJ 0.064 U 0.42 J 0.54 J

GRANDVIEW 11/13/2007 0.29 0.065 UJ 0.065 U 0.065 UJ 0.09 UJ

MARION 11/14/2007 0.067 U 0.89 J 0.067 U 0.078 J 0.11 UJ

SATUS 303 11/13/2007 0.23 0.96 J 0.10 J 0.069 J 0.11 UJ

SATUS CK 11/13/2007 0.066 U 2.2 J 0.066 U 0.15 J 0.14 UJ

SELAH DC H 11/26/2007 0.20 UJ 0.49 UJ 0.10 UJ 0.75 J 1.3

SOUTH DR 11/13/2007 0.16 J 0.32 J 0.063 U 0.063 UJ 0.17 J

SOUTH REP 11/13/2007 0.15 J 0.23 J 0.063 U 0.063 UJ 0.16 J

SUB 35 11/14/2007 0.072 J 2.4 J 0.064 U 0.064 J 0.071 UJ

TAYLOR D 11/15/2007 0.063 U 0.063 UJ 0.063 U 0.084 J 0.3 J

TOP CK 11/14/2007 0.064 U 0.48 J 0.064 U 0.076 J 0.25 J

WENAS 11/15/2007 0.063 U 0.074 J 0.063 U 0.063 UJ 0.14 J

WIDE HOL 11/15/2007 0.70 UJ 0.062 UJ 0.83 0.98 J 4.4

WIDE REP 11/15/2007 0.60 UJ 0.063 UJ 0.68 0.65 J 2.2 J

ZILLAH 11/14/2007 0.063 U 0.063 UJ 0.067 U 0.16 J 0.59 J

SATUS 302 standing water 

SELAH CR. dry

COLD CR. dry

Endosulfan 

I

Endosulfan 

II

Endosulfan 

Dieldrin Chlorpyrifos Sulfate

U = not detected at or above reported value 

J = estimated 

REJ = rejected 

na = not analyzed 
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Collection

Field ID Date (ng/L) (ng/L) (ng/L) (ng/L) (ng/L) (ng/L)

AHTANUM 11/15/2007 3.1 U 0.061 U 0.061 U 0.061 U 0.061 U 0.061 U

AMON CK 11/13/2007 3.3 UJ 0.066 U 0.066 U 0.066 U 0.066 U 0.066 U

CORRAL 11/13/2007 3.2 UJ 0.063 U 0.063 U 0.063 U 0.063 U 0.063 U

COULEE DR 11/14/2007 3.2 UJ 0.063 U 0.063 U 0.063 U 0.063 U 0.063 U

COWICHEE 11/15/2007 3.1 U 0.061 U 0.061 U 0.061 U 0.061 U 0.061 U

DID 7 11/13/2007 3.2 UJ 0.064 U 0.064 U 0.064 U 0.064 U 0.064 U

DRAIN 31 11/13/2007 3.2 UJ 0.064 U 0.064 U 0.064 U 0.064 U 0.064 U

EAST TOP 11/14/2007 3.2 UJ 0.064 U 0.10 UJ 0.064 U 0.064 U 0.064 U

GRANDVIEW 11/13/2007 3.2 UJ 0.065 U 0.065 U 0.065 U 0.065 U 0.065 U

MARION 11/14/2007 3.3 UJ 0.067 U 0.067 U 0.067 U 0.067 U 0.067 U

SATUS 303 11/13/2007 3.3 UJ 0.066 U 0.066 U 0.066 U 0.066 U 0.066 U

SATUS CK 11/13/2007 3.3 UJ 0.066 U 0.066 U 0.066 U 0.066 U 0.066 U

SELAH DC H 11/26/2007 3.1 U 0.063 U 0.063 U 0.11 UJ 0.063 U 0.063 U

SOUTH DR 11/13/2007 3.2 UJ 0.063 U 0.063 U 0.063 U 0.063 U 0.063 U

SOUTH REP 11/13/2007 3.1 UJ 0.063 U 0.063 U 0.063 U 0.063 U 0.063 U

SUB 35 11/14/2007 3.2 UJ 0.064 U 0.064 U 0.064 U 0.064 U 0.064 U

TAYLOR D 11/15/2007 3.1 U 0.063 U 0.063 U 0.063 U 0.063 U 0.063 U

TOP CK 11/14/2007 3.2 UJ 0.064 U 0.064 U 0.064 U 0.064 U 0.064 U

WENAS 11/15/2007 3.1 U 0.063 U 0.063 U 0.063 U 0.063 U 0.063 U

WIDE HOL 11/15/2007 3.1 U 0.062 J 0.062 U 0.072 J 0.062 U 0.062 U

WIDE REP 11/15/2007 3.1 U 0.063 U 0.063 U 0.063 U 0.063 U 0.063 U

ZILLAH 11/14/2007 3.2 0.063 U 0.063 U 0.067 U 0.067 U 0.067 U

SATUS 302 standing water 

SELAH CR. dry

COLD CR. dry

OxyToxaphene chlordaneCisChlordane CisNonachlorTransChlordaneTransNonachlo

U = not detected at or above reported value

J = estimated 

REJ = rejected 

na = not analyzed 
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Collection

Field ID Date (ng/L) (ng/L) (ng/L) (ng/L) (ng/L) (ng/L)

AHTANUM 11/15/2007 0.061 U 0.061 U 0.061 UJ 0.061 U 0.061 U 0.061 UJ

AMON CK 11/13/2007 0.066 U 0.098 UJ 0.066 UJ 0.066 U 0.066 U 0.066 UJ

CORRAL 11/13/2007 0.063 U 0.063 U 0.063 UJ 0.063 U 0.063 U 0.063 UJ

COULEE DR 11/14/2007 0.063 U 0.063 U 0.063 UJ 0.063 U 0.063 U 0.063 UJ

COWICHEE 11/15/2007 0.061 U 0.061 U 0.061 UJ 0.061 U 0.061 U 0.061 UJ

DID 7 11/13/2007 0.064 U 0.064 U 0.064 UJ 0.064 U 0.064 U 0.064 UJ

DRAIN 31 11/13/2007 0.064 U 0.064 U 0.064 UJ 0.064 U 0.064 U 0.064 UJ

EAST TOP 11/14/2007 0.064 U 0.064 U 0.064 UJ 0.49 0.064 U 0.07 UJ

GRANDVIEW 11/13/2007 0.065 U 0.065 U 0.065 UJ 0.065 U 0.065 U 0.065 UJ

MARION 11/14/2007 0.067 U 0.067 U 0.067 UJ 0.067 U 0.067 U 0.067 UJ

SATUS 303 11/13/2007 0.14 0.16 J 0.066 UJ 0.085 0.066 U 0.066 UJ

SATUS CK 11/13/2007 0.066 U 0.066 U 0.066 UJ 0.066 U 0.066 U 0.066 UJ

SELAH DC H 11/26/2007 0.063 U 0.099 UJ 0.097 UJ 0.30 UJ 0.063 U 0.091 J

SOUTH DR 11/13/2007 0.063 U 0.063 U 0.063 UJ 0.063 U 0.063 U 0.063 UJ

SOUTH REP 11/13/2007 0.063 U 0.063 U 0.063 UJ 0.063 U 0.063 U 0.063 UJ

SUB 35 11/14/2007 0.064 U 0.064 U 0.064 UJ 0.064 U 0.064 U 0.064 UJ

TAYLOR D 11/15/2007 0.063 U 0.12 UJ 0.063 UJ 0.063 U 0.063 U 0.063 UJ

TOP CK 11/14/2007 0.064 U 0.064 U 0.064 UJ 0.064 U 0.064 U 0.064 UJ

WENAS 11/15/2007 0.063 U 0.063 U 0.063 UJ 0.063 U 0.063 U 0.063 UJ

WIDE HOL 11/15/2007 0.062 U 0.062 U 0.062 UJ 0.062 U 0.062 U 0.36 J

WIDE REP 11/15/2007 0.063 U 0.063 U 0.063 UJ 0.063 U 0.063 U 0.27 J

ZILLAH 11/14/2007 0.067 U 0.067 U 0.067 UJ 0.067 U 0.067 U 0.063 UJ

SATUS 302 standing water 

SELAH CR. dry

COLD CR. dry

Endrin

AlphaBHCBetaBHCDeltaBHC Lindane Aldrin

U = not detected at or above reported value 

J = estimated 

REJ = rejected 

na = not analyzed 
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Page 277 

Collection

Field ID Date (ng/L) (ng/L) (ng/L) (ng/L) (ng/L)

AHTANUM 11/15/2007 0.061 U 0.061 U 0.061 U 0.061 U 0.061 U

AMON CK 11/13/2007 0.066 U 0.066 U 0.066 U 0.066 U 0.066 U

CORRAL 11/13/2007 0.13 UJ 0.063 U 0.063 U 0.063 U 0.063 U

COULEE DR 11/14/2007 0.063 U 0.063 U 0.063 U 0.063 U 0.063 U

COWICHEE 11/15/2007 0.061 U 0.061 U 0.061 U 0.061 U 0.061 U

DID 7 11/13/2007 0.064 U 0.064 U 0.064 U 0.064 U 0.064 U

DRAIN 31 11/13/2007 0.18 UJ 0.064 U 0.064 U 0.064 U 0.064 U

EAST TOP 11/14/2007 0.16 UJ 0.064 U 0.064 U 0.064 U 0.064 U

GRANDVIEW 11/13/2007 0.092 UJ 0.065 U 0.065 U 0.065 U 0.065 U

MARION 11/14/2007 0.067 U 0.067 U 0.067 U 0.067 U 0.067 U

SATUS 303 11/13/2007 0.096 UJ 0.066 U 0.066 U 0.066 U 0.066 U

SATUS CK 11/13/2007 0.1 UJ 0.066 U 0.066 U 0.066 U 0.066 U

SELAH DC H 11/26/2007 0.84 UJ 0.063 U 0.063 U 0.2 UJ 0.063 U

SOUTH DR 11/13/2007 0.064 UJ 0.063 U 0.063 U 0.063 U 0.063 U

SOUTH REP 11/13/2007 0.067 UJ 0.063 U 0.063 U 0.063 U 0.063 U

SUB 35 11/14/2007 0.064 U 0.064 U 0.064 U 0.064 U 0.064 U

TAYLOR D 11/15/2007 0.21 UJ 0.11 UJ 0.063 U 0.063 U 0.063 U

TOP CK 11/14/2007 0.064 U 0.064 U 0.064 U 0.064 U 0.064 U

WENAS 11/15/2007 0.063 U 0.063 U 0.063 U 0.063 U 0.063 U

WIDE HOL 11/15/2007 0.15 UJ 0.13 J 0.062 U 0.062 U 0.43 UJ

WIDE REP 11/15/2007 0.13 UJ 0.075 UJ 0.063 U 0.063 U 0.35 UJ

ZILLAH 11/14/2007 0.097 UJ 0.067 U 0.067 U 0.067 U 0.067 U

SATUS 302 standing water 

SELAH CR. dry

COLD CR. dry

Endrin 

Aldehyde

Endrin 

Ketone Heptachlor

Heptachlor 

Epoxide

Hexachlorobenzene

U = not detected at or above reported value 

J = estimated 

REJ = rejected 

na = not analyzed 
Yakima Pesticides/PCBs TMDL: Vol 1, WQ Study Findings 

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Collection

Field ID Date (ng/L) (mg/L) (NTU) (umhos/cm)

AHTANUM 11/15/2007 0.25 UJ 3 2.6 219

AMON CK 11/13/2007 0.066 UJ 2 0.6 718

CORRAL 11/13/2007 0.086 UJ 3 1.8 545

COULEE DR 11/14/2007 0.063 UJ 3 3.5 306

COWICHEE 11/15/2007 0.45 UJ 2 1.2 345

DID 7 11/13/2007 0.22 UJ 8 10 627

DRAIN 31 11/13/2007 0.52 UJ 7 4.1 867

EAST TOP 11/14/2007 0.064 UJ 11 11 310

GRANDVIEW 11/13/2007 0.065 UJ 33 12 559

MARION 11/14/2007 0.067 UJ 10 7.3 360

SATUS 303 11/13/2007 0.24 UJ 1 U 1.0 1080

SATUS CK 11/13/2007 0.19 UJ 2 2.2 237

SELAH DC H 11/26/2007 0.063 UJ 73 28 696

SOUTH DR 11/13/2007 0.063 UJ 10 3.4 780

SOUTH REP 11/13/2007 0.10 UJ 10 4.4 780

SUB 35 11/14/2007 0.064 UJ 11 8.9 331

TAYLOR D 11/15/2007 0.33 UJ 3 2.6 432

TOP CK 11/14/2007 0.19 UJ 5 6.0 424

WENAS 11/15/2007 0.3 UJ 1 2.0 350

WIDE HOL 11/15/2007 0.35 UJ 5 2.2 517

WIDE REP 11/15/2007 0.39 UJ 4 2.7 517

ZILLAH 11/14/2007 0.067 UJ 7 5.0 498

SATUS 302 standing water 

SELAH CR. dry

COLD CR. dry

Methoxychlor

Total 

Suspended 

Solids Conductivity Turbidity

U = not detected at or above reported value 

J = estimated 

REJ = rejected 

na = not analyzed 
Yakima Pesticides/PCBs TMDL: Vol 1, WQ Study Findings 

Page 279 

Collection Flow

Sample No. Field ID Date (cfs) (ng/L) (ng/L) (ng/L)

8074084 AHTANUM 2/11/2008 44 0.062 U 0.2 0.079

8074101 AMON CK 2/13/2008 9.6 0.065 U 0.085 0.065 U

8074099 CORRAL 2/13/2008 4.6 0.064 U 0.14 0.064 U

8074090 COULEE DR 2/12/2008 <1 0.062 U 0.35 J 0.14 J

8074104 COWICHEE 2/11/2008 10.0 0.13 0.38 0.085

8074093 DID7 2/13/2008 3.6 0.065 U 0.52 0.1 J

8074097 DRAIN 31 2/13/2008 0.1 0.064 U 0.38 0.075 J

8074086 EAST TOP 2/12/2008 6.6 0.063 U 0.74 J 0.39 J

8074096 GRANDVIEW 2/13/2008 5.1 1.1 J 2.9 J 0.8 J

8074088 MARION 2/12/2008 179 0.061 U 0.5 J 0.14 J

8074094 SATUS 303 2/13/2008 1.3 0.063 U 0.33 0.063 U

8074091 SATUS CK 2/12/2008 352 0.063 U 0.063 U 0.063 U

8074080 SELAH CK 2/11/2008 1.7 0.061 UJ 0.061 UJ 0.061 UJ

8074082 SELAH DCH 2/11/2008 1.3 0.25 1.4 0.74

8074092 SOUTH DR 2/13/2008 10 0.066 J 0.68 0.18 J

8074102 SOUTH REP 2/13/2008 - - 0.066 J 0.67 0.17 J

8074087 SUB 35 2/12/2008 20.9 0.28 J 1.4 J 1.1 J

8074100 TAYLOR D 2/11/2008 3.8 0.063 U 0.31 0.10 J

8074089 TOP CK 2/12/2008 112 0.063 U 0.11 0.063 U

8074081 WENAS 2/11/2008 2.5 0.065 U 0.15 0.065 U

8074083 WIDE HOL 2/12/2008 3.3 0.1 J 1.2 J 0.47 J

8074085 ZILLAH 2/12/2008 0.1 0.15 1.3 0.36

8074103 ZILLAH REP 2/12/2008 - - 0.09 0.79 0.21

 - - COLD CR. dry

 - - WAUNA dry

4,4'-DDT 4,4'-DDE 4,4'-DDD

U = not detected at or above reported value 

J = estimated 

REJ = rejected 

na = not analyzed 
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Collection

Field ID Date (ng/L) (ng/L) (ng/L) (ng/L) (ng/L)

AHTANUM 2/11/2008 0.062 U 0.18 UJ 0.062 U 0.062 U 0.4 J

AMON CK 2/13/2008 0.065 U 0.15 J 0.074 J 0.12 J 1.1 J

CORRAL 2/13/2008 0.064 U 0.068 J 0.064 U 0.064 U 0.35 J

COULEE DR 2/12/2008 0.062 U 1.1 0.11 0.062 U 0.17 J

COWICHEE 2/11/2008 0.065 U 0.86 0.12 J 0.18 J 1.7 UJ

DID7 2/13/2008 0.065 U 0.11 J 0.065 U 0.065 U 0.29 J

DRAIN 31 2/13/2008 0.38 0.82 0.27 J 0.3 0.43 UJ

EAST TOP 2/12/2008 0.29 1.7 0.063 U 0.33 J 0.48 J

GRANDVIEW 2/13/2008 0.3 0.087 J 0.062 U 0.062 U 0.21 UJ

MARION 2/12/2008 0.061 U 0.86 0.072 0.061 U 0.13 J

SATUS 303 2/13/2008 0.27 0.79 J 0.17 0.11 J 1.5 UJ

SATUS CK 2/12/2008 0.063 U 0.14 J 0.063 U 0.063 U 0.26 J

SELAH CK 2/11/2008 0.061 U 0.061 U 0.48 UJ 0.39 UJ 8.7 J

SELAH DCH 2/11/2008 0.88 J 0.063 U 1.2 J 1.4 J 2.7 J

SOUTH DR 2/13/2008 0.12 0.21 J 0.078 J 0.063 U 0.41 J

SOUTH REP 2/13/2008 0.13 0.15 J 0.075 J 0.064 U 0.39 J

SUB 35 2/12/2008 0.061 U 1.2 0.061 U 0.061 U 0.1 J

TAYLOR D 2/11/2008 0.33 J 1.2 0.063 U 0.063 U 0.88 J

TOP CK 2/12/2008 0.063 U 0.53 J 0.084 J 0.063 U 0.54 J

WENAS 2/11/2008 0.35 J 0.72 J 0.4 UJ 0.22 J 1.1 J

WIDE HOL 2/12/2008 1.0 J 0.55 J 2.2 J 2 J 13 J

ZILLAH 2/12/2008 0.063 U 0.56 0.063 J 0.15 1.1

ZILLAH REP 2/12/2008 0.063 U 0.34 0.063 U 0.078 J 0.36 J

COLD CR. dry

WAUNA dry

Endosulfan 

I

Endosulfan 

II

Endosulfan 

Dieldrin Chlorpyrifos Sulfate

U = not detected at or above reported value 

J = estimated 

REJ = rejected 

na = not analyzed 
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Collection

Field ID Date (ng/L) (ng/L) (ng/L) (ng/L) (ng/L) (ng/L)

AHTANUM 2/11/2008 3.1 U 0.062 U 0.062 U 0.062 U 0.062 U 0.062 U

AMON CK 2/13/2008 3.2 U 0.065 U 0.065 U 0.065 U 0.065 U 0.065 U

CORRAL 2/13/2008 3.2 U 0.064 U 0.064 U 0.064 U 0.064 U 0.064 U

COULEE DR 2/12/2008 3.1 U 0.062 U 0.062 U 0.062 U 0.062 U 0.062 U

COWICHEE 2/11/2008 3.2 U 0.065 U 0.065 U 0.065 U 0.065 U 0.065 U

DID7 2/13/2008 3.2 U 0.065 U 0.065 U 0.065 U 0.065 U 0.065 U

DRAIN 31 2/13/2008 3.2 U 0.064 U 0.064 U 0.064 U 0.064 U 0.064 U

EAST TOP 2/12/2008 3.1 U 0.094 UJ 0.063 U 0.71 UJ 0.063 U 0.063 U

GRANDVIEW 2/13/2008 3.1 U 0.062 U 0.062 U 0.062 U 0.062 U 0.062 U

MARION 2/12/2008 3.1 U 0.061 U 0.061 U 0.061 U 0.061 U 0.061 U

SATUS 303 2/13/2008 3.1 U 0.063 U 0.063 U 0.063 U 0.063 U 0.063 U

SATUS CK 2/12/2008 3.2 U 0.063 U 0.063 U 0.063 U 0.063 U 0.063 U

SELAH CK 2/11/2008 3.1 UJ 0.061 UJ 0.061 UJ 0.061 UJ 0.061 UJ 0.061 UJ

SELAH DCH 2/11/2008 3.1 U 0.063 U 0.063 U 0.063 U 0.063 U 0.063 U

SOUTH DR 2/13/2008 3.2 U 0.063 U 0.063 U 0.063 U 0.063 U 0.063 U

SOUTH REP 2/13/2008 3.2 U 0.064 U 0.064 U 0.064 U 0.064 U 0.064 U

SUB 35 2/12/2008 3.1 U 0.061 U 0.061 U 0.061 U 0.061 U 0.061 U

TAYLOR D 2/11/2008 3.2 U 0.063 U 0.063 U 0.063 U 0.063 U 0.063 U

TOP CK 2/12/2008 3.1 U 0.063 U 0.063 U 0.063 U 0.063 U 0.063 U

WENAS 2/11/2008 3.2 U 0.065 U 0.065 U 0.065 U 0.065 U 0.065 U

WIDE HOL 2/12/2008 3.2 U 0.065 U 0.065 U 0.065 U 0.065 U 0.065 U

ZILLAH 2/12/2008 3.1 U 0.063 U 0.063 U 0.063 U 0.063 U 0.063 U

ZILLAH REP 2/12/2008 3.1 U 0.063 U 0.063 U 0.063 U 0.063 U 0.063 U

COLD CR. dry

WAUNA dry

OxyToxaphene chlordaneCisChlordane CisNonachlorTransChlordaneTransNonachlor

U = not detected at or above reported value 

J = estimated 

REJ = rejected 

na = not analyzed 
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Collection

Field ID Date (ng/L) (ng/L) (ng/L) (ng/L) (ng/L) (ng/L)

AHTANUM 2/11/2008 0.062 U 0.063 UJ 0.062 U 0.062 U 0.064 UJ 0.062 U

AMON CK 2/13/2008 0.065 U 0.065 U 0.065 U 0.065 U 0.13 UJ 0.099 UJ

CORRAL 2/13/2008 0.064 U 0.064 U 0.064 U 0.064 U 0.087 0.064 U

COULEE DR 2/12/2008 0.062 U 0.062 U 0.062 U 0.062 U 0.21 UJ 0.062 U

COWICHEE 2/11/2008 0.065 U 0.065 U 0.065 U 0.065 U 0.58 UJ 0.14 UJ

DID7 2/13/2008 0.065 U 0.065 U 0.065 U 0.065 U 0.12 UJ 0.065 U

DRAIN 31 2/13/2008 0.064 U 0.064 U 0.064 U 0.064 U 0.064 U 0.064 U

EAST TOP 2/12/2008 0.063 U 0.063 U 0.063 U 0.064 UJ 0.27 UJ 0.07 UJ

GRANDVIEW 2/13/2008 0.062 U 0.062 U 0.062 U 0.062 U 0.28 0.062 U

MARION 2/12/2008 0.061 U 0.061 U 0.061 U 0.061 U 0.067 UJ 0.061 U

SATUS 303 2/13/2008 0.063 U 0.063 U 0.063 U 0.063 U 0.10 UJ 0.19 UJ

SATUS CK 2/12/2008 0.063 U 0.063 U 0.063 U 0.063 U 0.12 UJ 0.063 U

SELAH CK 2/11/2008 0.085 J 0.061 J 0.061 UJ 0.075 J 1.6 UJ 2.7 UJ

SELAH DCH 2/11/2008 0.063 U 0.079 UJ 0.063 U 0.063 U 0.14 UJ 0.12 UJ

SOUTH DR 2/13/2008 0.063 U 0.063 U 0.063 U 0.063 U 0.17 UJ 0.068

SOUTH REP 2/13/2008 0.064 U 0.064 U 0.064 U 0.064 U 0.17 UJ 0.064 U

SUB 35 2/12/2008 0.061 U 0.061 U 0.061 U 0.061 U 0.061 U 0.061 U

TAYLOR D 2/11/2008 0.063 U 0.063 U 0.063 U 0.063 U 0.83 UJ 0.15 UJ

TOP CK 2/12/2008 0.063 U 0.063 U 0.063 U 0.063 U 0.27 UJ 0.063 U

WENAS 2/11/2008 0.065 U 0.065 U 0.065 U 0.065 U 0.99 UJ 0.37

WIDE HOL 2/12/2008 0.065 U 0.065 U 0.065 U 0.065 U 0.11 UJ 0.41 J

ZILLAH 2/12/2008 0.063 U 0.063 U 0.063 U 0.063 U 0.064 UJ 0.063 U

ZILLAH REP 2/12/2008 0.063 U 0.063 U 0.063 U 0.063 U 0.063 U 0.063 U

COLD CR. dry

WAUNA dry

Endrin

AlphaBHCBetaBHCDeltaBHC Lindane Aldrin

U = not detected at or above reported value 

J = estimated 

REJ = rejected 

na = not analyzed 
Yakima Pesticides/PCBs TMDL: Vol 1, WQ Study Findings 

Page 283 

Collection

Field ID Date (ng/L) (ng/L) (ng/L) (ng/L) (ng/L)

AHTANUM 2/11/2008 0.062 U 0.062 U 0.062 U 0.062 U 0.062 U

AMON CK 2/13/2008 0.13 UJ 0.065 U 0.065 U 0.065 U 0.065 U

CORRAL 2/13/2008 0.064 U 0.064 U 0.064 U 0.064 U 0.064 U

COULEE DR 2/12/2008 0.062 U 0.15 UJ 0.062 U 0.062 U 0.062 U

COWICHEE 2/11/2008 0.065 UJ 0.065 U 0.065 U 0.065 U 0.065 U

DID7 2/13/2008 0.065 U 0.069 UJ 0.065 U 0.065 U 0.065 U

DRAIN 31 2/13/2008 0.11 UJ 0.23 UJ 0.064 U 0.11 UJ 0.064 U

EAST TOP 2/12/2008 0.18 UJ 0.063 U 0.063 U 0.063 U 0.063 U

GRANDVIEW 2/13/2008 0.069 UJ 0.071 UJ 0.062 U 0.062 U 0.062 U

MARION 2/12/2008 0.061 U 0.061 U 0.061 U 0.061 U 0.061 U

SATUS 303 2/13/2008 0.21 UJ 0.063 U 0.063 U 0.063 U 0.063 U

SATUS CK 2/12/2008 0.081 UJ 0.063 U 0.063 U 0.063 U 0.063 U

SELAH CK 2/11/2008 1.9 UJ 1.9 UJ 0.061 UJ 2.0 UJ 0.093 UJ

SELAH DCH 2/11/2008 0.063 U 0.063 U 0.063 U 0.57 UJ 0.063 U

SOUTH DR 2/13/2008 0.063 U 0.074 UJ 0.063 U 0.063 U 0.063 U

SOUTH REP 2/13/2008 0.064 U 0.064 U 0.064 U 0.064 U 0.064 U

SUB 35 2/12/2008 0.061 U 0.061 U 0.061 U 0.061 U 0.061 U

TAYLOR D 2/11/2008 1.4 UJ 0.063 U 0.063 U 0.063 U 0.063 U

TOP CK 2/12/2008 0.063 U 0.13 UJ 0.063 U 0.063 U 0.063 U

WENAS 2/11/2008 0.31 UJ 0.5 UJ 0.065 U 0.17 UJ 0.065 U

WIDE HOL 2/12/2008 0.081 UJ 0.20 J 0.065 U 0.065 U 0.61 J

ZILLAH 2/12/2008 0.15 UJ 0.063 U 0.063 U 0.063 U 0.063 U

ZILLAH REP 2/12/2008 0.09 UJ 0.063 U 0.063 U 0.063 U 0.063 U

COLD CR. dry

WAUNA dry

Endrin 

Aldehyde

Endrin 

Ketone Heptachlor

Heptachlor 

Epoxide

Hexachlorobenzene

U = not detected at or above reported value 

J = estimated 

REJ = rejected 

na = not analyzed 
Yakima Pesticides/PCBs TMDL: Vol 1, WQ Study Findings 

Page 284 

Collection

Field ID Date (ng/L) (mg/L) (NTU) (umhos/cm)

AHTANUM 2/11/2008 0.062 UJ 12 7.8 205

AMON CK 2/13/2008 0.075 UJ 32 10 759

CORRAL 2/13/2008 0.15 UJ 9 4.3 579

COULEE DR 2/12/2008 0.062 UJ 8 5.4 298

COWICHEE 2/11/2008 0.065 UJ 9 8.1 188

DID7 2/13/2008 0.094 UJ 5 3.9 625

DRAIN 31 2/13/2008 0.58 UJ 2 2.2 834

EAST TOP 2/12/2008 0.64 UJ 12 6.8 296

GRANDVIEW 2/13/2008 1.3 J 8 4.1 593

MARION 2/12/2008 0.061 UJ 19 7.4 376

SATUS 303 2/13/2008 1.4 UJ 1 U 0.5 1080

SATUS CK 2/12/2008 0.25 UJ 19 7.9 123

SELAH CK 2/11/2008 1.8 UJ 30 39 210

SELAH DCH 2/11/2008 1.0 UJ 30 9.7 681

SOUTH DR 2/13/2008 0.063 UJ 4 4.4 766

SOUTH REP 2/13/2008 0.064 UJ 5 3.1 768

SUB 35 2/12/2008 0.061 UJ 23 9.7 350

TAYLOR D 2/11/2008 0.063 UJ 3 3.4 540

TOP CK 2/12/2008 0.063 UJ 10 7.9 338

WENAS 2/11/2008 0.66 UJ 7 6.5 281

WIDE HOL 2/12/2008 0.17 UJ 2 1.0 540

ZILLAH 2/12/2008 0.16 UJ 4 2.8 530

ZILLAH REP 2/12/2008 0.063 UJ 4 2.6 534

COLD CR. dry

WAUNA dry

Methoxychlor

Total 

Suspended 

Solids Turbidity Conductivity

U = not detected at or above reported value 

J = estimated 

REJ = rejected 

na = not analyzed 
Yakima Pesticides/PCBs TMDL: Vol 1, WQ Study Findings 

Page 285 

Appendix L. Washington State Department of Health 

Fish Consumption Advisory 

You are here: DOH Home » News Releases Home » 09-075 Search | Employees

For immediate release: April 30, 2009 (09-075) 

Contacts: 

Dave McBride, Environmental Health Assessments 360-236-3176 

Allison Cook, Communications Office 360-236-4022 

Yakima River fish consumption advisory lifted due to lower DDT levels 

Other fish will be added due to increased PCB monitoring and detection 

OLYMPIA  Dropping levels of DDT found in fish in the Yakima River have led state health 

officials to drop advisories to limit meals from certain fish species from the river. Recent data on 

PCBs, though, has resulted in new advice on eating common carp from the Yakima. 

Since 1993 the Department of Health has recommended people eat no more than one meal a 

week of bottom fish from the Yakima River to avoid DDT exposure. At that time, DDT levels in 

Yakima River bottom fish were among the highest reported in the nation. The advisory was for 

largescale and bridgelip sucker, mountain whitefish, channel catfish, northern pikeminnow, and 

common carp. DDT is a pesticide that was used in agriculture; its use was banned in the 1970s. 

A Department of Ecology study completed in 2007 found erosion control projects put in place by 

Yakima basin irrigators helped reduce DDT and its byproducts in fish from the Yakima River. 

The state health department evaluated the new data and determined the fish advisories based on 

DDT levels are no longer needed. The declining levels of DDT in resident bottom fish from the 

river, along with proper cleaning and cooking, allow people to eat them safely without limits. 

"Fish is an excellent low-fat food and a great source of protein, vitamins, and minerals," said 

State Health Officer Dr. Maxine Hayes. "It’s important to include a variety of fish as part of a 

healthy diet. And while the news on DDT in Yakima River fish is good, we recently learned that 

PCBs in carp from the lower Yakima are high enough to warrant a meal limit. This is especially 

true for young children and women who might one day become pregnant." 

"Yakima Valley irrigators really stepped up and deserve recognition for tackling a tough problem 

on one of Washington’s great rivers," said Department of Ecology Director Jay Manning. "Like 

most watersheds, there’s more work to be done, but this community has shown it can take on 

these types of challenges." 
Yakima Pesticides/PCBs TMDL: Vol 1, WQ Study Findings 

Page 286 

Data from the Ecology fish tissue study showed PCB levels in common carp in the lower section 

of the river indicate a need for a limit of one meal per week. This advisory includes carp taken 

from the lower Yakima River from the city of Prosser to the mouth near Richland. 

PCB levels for other species sampled throughout the river system were below levels of health 

concern for people. Meanwhile, the statewide mercury advisory for women who are or might 

become pregnant, nursing mothers, and young children remains in effect. State health officials 

advise people in these groups not to eat northern pikeminnow, and to limit largemouth and 

smallmouth bass to two meals per month. 

PCBs and mercury are long-lasting chemicals that are found worldwide. They can cause 

behavior and learning deficits in children exposed in the womb. Banned since 1977, PCBs were 

used as insulating fluid in electrical transformers, lubricants, and hydraulic fluids. Mercury 

occurs naturally but also comes from coal-fired electric plants and improper disposal of 

fluorescent bulbs, thermometers, thermostats, and electrical switches. 

To reduce your exposure to PCBs in common carp from the Yakima River, the Department of 

Health recommends you: 

 Limit your consumption of common carp caught from Prosser to the mouth of the river near 

Richland to no more than one meal per week. 

 Cook and clean fish to reduce contaminants; remove fat, skin, and organs and allow fat to 

drip off during cooking. Filleting reduces PCB, but not mercury contamination. 

Learn more about the Yakima River fish advisory, other fish consumption advisories, and 

healthy fish choices (www.doh.wa.gov/fish/) on the state health department Web site. 
Yakima Pesticides/PCBs TMDL: Vol 1, WQ Study Findings 

Page 287 

Appendix M. SPMD Data, 2007-08 

Appendix M-1. SPMD Data for Spring 2007. 

Sample No. Field ID 

Residue in SPMD 

(ng/sample) 

 Water Column 

Concentration 

(ng/L, dissolved) 

Toxaphene Total 

PCBs Toxaphene Total PCBs 

7234180 EASTON 50 UJ 95 J 0.077 UJ 0.084 U 

7234181 EASTON BLANK 50 UJ 148 J - - J 

7234182 TOWNE DIV 50 UJ 159 J 0.095 UJ 0.12 J 

7244015 WILSON CR† 332 J 124 J 0.50 J 0.007 J 

7234184 ROZA DAM 100 J 165 J 0.19 J 0.018 J 

7234185 NACHES R 73 J 257 J 0.11 J 0.063 J 

7234186 MOXEE 470 198 J 0.71 0.024 J 

7234187 SUNNYSIDE 150 J 187 J 0.23 J 0.020 J 

7234188 GRANGER 550 J 338 J 0.84 J 0.095 J 

7234189 SULPHUR 1,900 J 418 J 2.96 J 0.16 J 

7234190 SULPHUR REP 1,700 J 532 J 2.73 J 0.27 J 

7234191 SULPHUR BLANK 50 U 150 J - - - - 

7234192 PROSSER 200 194 J 0.30 0.021 J 

7234193 PROSSER REP 210 J 268 J 0.33 J 0.075 J 

7234194 SPRING CR 270 J 198 J 0.42 J 0.024 J 

7234195 HORN RAPIDS 240 246 J 0.36 0.045 J 

 

Note: Dissolved PCB concentrations calculated after subtracting average field blank residue (149 ng). 

*Laboratory blank for SPMD preparation prior to field deployment. 

†Collected Spring 2008. 

U = not detected. 

UJ = not detected, reporting limit is an estimate. 

J= estimated concentration. 

 
Yakima Pesticides/PCBs TMDL: Vol 1, WQ Study Findings 

Page 288 

Appendix M-2. SPMD Data for Winter 2007. 

Sample 

No. Field ID 

Residue in SPMD Water Column 

Concentration 

(ng/sample) (ng/L, dissolved) 

Toxaphene Total 

PCBs Toxaphene Total PCBs 

7484250 EASTON 50 U 136 J 0.083 U 0.11 J 

7484251 EASTON BLANK 50 UJ 104 J - - - - 

7484252 TOWNE DIV 50 U 152 J 0.084 U 0.13 J 

7484253 WILSON CR 78 J 128 J 0.12 J 0.084 J 

7484254 ROZA DAM 50 U 120 J 0.081 U 0.086 J 

7484255 NACHES R 50 UJ 119 J 0.084 UJ 0.099 J 

7484256 MOXEE 88 J 146 J 0.14 J 0.11 J 

7484257 SUNNYSIDE 66 J 116 J 0.10 J 0.065 J 

7484258 GRANGER 190 J 249 J 0.30 J 0.15 J 

7484259 SULPHUR 452 J 191 J 0.68 J 0.084 J 

7484260 SULPHUR BLANK 50 UJ 108 J - - - - 

7484261 PROSSER 86 J 104 J 0.13 J 0.056 J 

7484262 PROSSER REP 86 J 132 J 0.13 J 0.053 J 

7484263 SPRING CR 110 J 138 J 0.19 J 0.12 J 

7484264 HORN RAPIDS 68 J 124 J 0.10 J 0.063 J 

 

Note: Dissolved PCB concentrations calculated after subtracting average field blank residue (106 ng). 

*Laboratory blank for SPMD preparation prior to field deployment. 

U = not detected. 

UJ = not detected, reporting limit is an estimate. 

J= estimated concentration. 

 
Yakima Pesticides/PCBs TMDL: Vol 1, WQ Study Findings 

Page 289 

Appendix N. Wastewater Treatment Plant Effluent Data, 

2007-08 

Collection Flow

Sample No. Field ID Date (mgd) (ng/L) (ng/L) (ng/L)

7248002 CLE ELUM WP 6/12/2007 0.460 na na na

7248001 ELLENSBURG WP 6/12/2007 3.69 na na na

7248014 ELLENSBURG REP 6/12/2007 - - na na na

7248000 KITTITAS WP 6/12/2007 0.212 na na na

7238100 SELAH WP 6/7/2007 1.05 2.1 UJ 2.1 UJ 2.1 UJ

7238101 NACHES WP 6/7/2007 0.101 2.1 UJ 2.1 UJ 2.1 UJ

7238102 COWICHE WP 6/7/2007 0.176 2.0 UJ 2.0 UJ 2.0 UJ

7238103 YAKIMA WP 6/7/2007 11.9 2.1 UJ 2.1 UJ 2.1 UJ

7238118 YAKIMA REP 6/7/2007 - - 2.1 UJ 2.1 UJ 2.1 UJ

7248003 MOXEE WP 6/12/2007 0.175 2.0 UJ 2.0 UJ 2.0 UJ

7248004 BUENA WP 6/12/2007 0.750 2.0 UJ 2.0 UJ 2.0 UJ

7248005 ZILLAH WP 6/12/2007 0.240 2.1 UJ 2.1 UJ 2.1 UJ

7248006 GRANGER WP 6/12/2007 0.178 2.1 UJ 2.1 UJ 2.1 UJ

7248007 SUNNYSIDE WP 6/12/2007 1.07 2.0 UJ 2.0 UJ 2.0 UJ

7248008 SS PORT WP 6/12/2007 0.534 2.0 UJ 2.0 UJ 2.0 UJ

7248009 MABTON WP 6/12/2007 0.110 2.0 UJ 2.0 UJ 2.0 UJ

7248010 GRANDVIEW WP 6/12/2007 1.75 2.0 UJ 2.0 UJ 2.0 UJ

7248011 PROSSER WP 6/14/2007 0.918 2.2 UJ 2.2 UJ 2.2 UJ

7248012 BENTONC WP 6/14/2007 0.185 2.1 UJ 2.1 UJ 2.1 UJ

7248013 W RICHLAND 6/14/2007 0.581 2.1 UJ 2.1 UJ 2.1 UJ

7248015 TRNSFR BLANK 6/12/2007 - - 2.0 UJ 2.0 UJ 2.0 UJ

7388847 CLE ELUM WP 9/18/2007 0.380 na na na

7388846 ELLENSBURG WP 9/18/2007 2.54 na na na

7388845 KITTITAS WP 9/18/2007 0.252 na na na

7388848 SELAH WP 9/20/2007 1.05 5.1 UJ 5.1 UJ 5.1 UJ

7388849 NACHES WP 9/20/2007 0.112 5.0 UJ 5.0 UJ 5.0 UJ

7388850 COWICHE WP 9/20/2007 0.165 5.1 UJ 5.1 UJ 5.1 UJ

7388851 YAKIMA WP 9/20/2007 12.8 5.1 UJ 5.1 UJ 5.1 UJ

7398827 MOXEE WP 9/25/2007 0.170 4.9 UJ 4.9 UJ 4.9 UJ

7398828 BUENA WP 9/25/2007 0.080 5.2 UJ 5.2 UJ 5.2 UJ

7398829 ZILLAH WP 9/25/2007 0.222 5.3 U 5.3 UJ 5.3 U

7398830 GRANGER WP 9/25/2007 0.193 5.1 U 5.1 UJ 5.1 U

7398834 SUNNYSIDE WP 9/25/2007 1.16 5.1 UJ 5.1 UJ 5.1 UJ

7398839 SUNYSIDE REP 9/25/2007 - - 5.2 UJ 5.2 UJ 5.2 UJ

7398835 SS PORT WP 9/25/2007 1.39 5.1 UJ 5.1 UJ 5.1 UJ

7398837 MABTON WP 9/25/2007 0.114 5.1 U 5.1 UJ 5.1 U

7398836 GRANDVIEW WP 9/25/2007 1.42 5.2 UJ 5.2 UJ 5.2 UJ

7398831 PROSSER WP 9/27/2007 0.956 5.3 UJ 5.3 UJ 5.3 UJ

7398832 BENTON WP 9/27/2007 0.189 5.4 UJ 5.4 UJ 5.4 UJ

7398833 W RICHLAND 9/27/2007 0.956 5.5 UJ 5.5 UJ 5.5 UJ

7398838 W RICHLAND REP 9/27/2007 - - 5.5 UJ 5.5 UJ 5.5 UJ

7398840 TRNSFR BLANK na na na

7'398841 BOTTLE BLNK na na na

4,4'-DDD 4,4'-DDE 4,4'-DDT

U = not detected at or above reported value J = estimated REJ = rejected na = not analyzed LS = lost in shipment 
Yakima Pesticides/PCBs TMDL: Vol 1, WQ Study Findings 

Page 290 

Collection 

Field ID Date (ng/L) (ng/L) (ng/L) (ng/L) (ng/L)

CLE ELUM WP 6/12/2007 na na na na na

ELLENSBURG WP 6/12/2007 na na na na na

ELLENSBURG REP 6/12/2007 na na na na na

KITTITAS WP 6/12/2007 na na na na na

SELAH WP 6/7/2007 2.1 U 2.1 U 2.1 U 2.1 U 2.7 J

NACHES WP 6/7/2007 2.1 U 2.1 U 2.1 U 2.1 U 3.5 J

COWICHE WP 6/7/2007 2.0 U 8.7 J 2.0 U 12 29 J

YAKIMA WP 6/7/2007 2.1 U 5.3 2.1 U 2.1 U 2.1 U

YAKIMA REP 6/7/2007 2.1 U 6.1 2.1 U 2.1 U 2.1 U

MOXEE WP 6/12/2007 2.0 U 3.2 2.0 U 2.0 U 2.7 J

BUENA WP 6/12/2007 2.0 U 2.2 J 2.0 U 2.0 U 6.7 J

ZILLAH WP 6/12/2007 2.1 U 4.2 2.1 U 2.1 U 5.4 J

GRANGER WP 6/12/2007 2.1 U 4.1 2.1 U 2.1 U 8.0 J

SUNNYSIDE WP 6/12/2007 2.0 U 2.0 J 2.0 U 2.0 U 4.5 J

SS PORT WP 6/12/2007 2.0 UJ 2.0 UJ 2.0 UJ 2.0 UJ 2.5 J

MABTON WP 6/12/2007 2.0 U 2.4 J 2.0 U 2.0 U 6.7 J

GRANDVIEW WP 6/12/2007 2.0 U 2 U 2 U 2.0 U 2.0 J

PROSSER WP 6/14/2007 2.2 U 2.2 U 2.2 U 2.2 U 2.2 U

BENTONC WP 6/14/2007 2.1 U 2.1 U 2.1 U 2.1 U 3.3 J

W RICHLAND 6/14/2007 2.1 U 2.1 U 2.1 U 2.1 U 2.1 U

TRNSFR BLANK 6/12/2007 2.0 U 2.0 U 2.0 U 2.0 U 2.0 U

CLE ELUM WP 9/18/2007 na na na na na

ELLENSBURG WP 9/18/2007 na na na na na

KITTITAS WP 9/18/2007 na na na na na

SELAH WP 9/20/2007 5.1 U 5.1 U 5.1 U 5.1 U 5.1 U

NACHES WP 9/20/2007 5.0 U 5.0 U 5.0 U 5.0 U 5.0 U

COWICHE WP 9/20/2007 5.1 U 5.1 U 5.1 U 33 12

YAKIMA WP 9/20/2007 5.1 U 7.2 UJ 5.1 U 5.1 U 5.1 U

MOXEE WP 9/25/2007 4.9 UJ 4.9 UJ 4.9 UJ 4.9 UJ 4.9 UJ

BUENA WP 9/25/2007 5.2 U 5.2 U 5.2 U 5.2 U 5.2 U

ZILLAH WP 9/25/2007 5.3 U 5.3 U 5.3 U 5.3 U 16

GRANGER WP 9/25/2007 5.1 U 5.1 U 5.1 U 5.1 U 7.1

SUNNYSIDE WP 9/25/2007 5.1 U 5.1 U 5.1 U 5.1 U 8.3

SUNYSIDE REP 9/25/2007 5.2 U 5.2 U 5.2 U 5.2 U 5.8 J

SS PORT WP 9/25/2007 5.1 UJ 5.1 UJ 5.1 UJ 5.1 UJ 5.1 UJ

MABTON WP 9/25/2007 5.1 U 5.1 U 5.1 U 5.1 U 8.4

GRANDVIEW WP 9/25/2007 5.2 U 5.2 U 5.2 U 5.2 U 5.2 U

PROSSER WP 9/27/2007 5.3 U 5.3 U 5.3 U 5.3 U 5.3 U

BENTON WP 9/27/2007 5.4 U 5.4 U 5.4 U 5.4 U 5.4 U

W RICHLAND 9/27/2007 5.5 U 5.5 U 5.5 U 5.5 U 5.5 U

W RICHLAND REP 9/27/2007 5.5 U 5.5 U 5.5 U 5.5 U 5.5 U

TRNSFR BLANK na na na na na

BOTTLE BLNK na na na na na

Dieldrin Chlorpyrifos Endosulfan I

Endosulfan 

II

Endosulfan 

Sulfate

U = not detected at or above reported value J = estimated REJ = rejected na = not analyzed LS = lost in shipment 
Yakima Pesticides/PCBs TMDL: Vol 1, WQ Study Findings 

Page 291 

 U = not detected at or above reported value J = estimated REJ = rejected na = not analyzed LS = lost in shipment 

 

Field ID

Collection 

Date

CLE ELUM WP 6/12/2007 na na na na na

ELENSBURG WP 6/12/2007 na na na na na

ELENSBRG REP 6/12/2007 na na na na na

KITTITAS WP 6/12/2007 na na na na na

SELAH WP 6/7/2007 2.1 UJ 2.1 UJ 2.1 UJ 2.1 UJ 2.1 UJ

NACHES WP 6/7/2007 2.1 UJ 2.1 UJ 2.1 UJ 2.1 UJ 2.1 UJ

COWICHE WP 6/7/2007 2.0 UJ 2.0 UJ 2.0 UJ 2.0 UJ 2.0 UJ

YAKIMA WP 6/7/2007 2.1 UJ 2.1 UJ 2.1 UJ 2.1 UJ 2.1 UJ

YAKIMA REP 6/7/2007 2.1 UJ 2.1 UJ 2.1 UJ 2.1 UJ 2.1 UJ

MOXEE WP 6/12/2007 2.0 UJ 2.0 UJ 2.0 UJ 2.0 UJ 2.0 UJ

BUENA WP 6/12/2007 2.0 UJ 2.0 UJ 2.0 UJ 2.0 UJ 2.0 UJ

ZILLAH WP 6/12/2007 2.1 UJ 2.1 UJ 2.1 UJ 2.1 UJ 2.1 UJ

GRANGER WP 6/12/2007 2.1 UJ 2.1 UJ 2.1 UJ 2.1 UJ 2.1 UJ

SUNNYSIDE WP 6/12/2007 2.0 UJ 2.0 UJ 2.0 UJ 2.0 UJ 2.0 UJ

SS PORT WP 6/12/2007 2.0 UJ 2.0 UJ 2.0 UJ 2.0 UJ 2.0 UJ

MABTON WP 6/12/2007 2.0 UJ 2.0 UJ 2.0 UJ 2.0 UJ 2.0 UJ

GRANDVIEW WP 6/12/2007 2.0 UJ 2.0 UJ 2.0 UJ 2.0 UJ 2.0 UJ

PROSSER WP 6/14/2007 2.2 UJ 2.2 UJ 2.2 UJ 2.2 UJ 2.2 UJ

BENTONC WP 6/14/2007 2.1 UJ 2.1 UJ 2.1 UJ 2.1 UJ 2.1 UJ

W RICHLAND WP 6/14/2007 2.1 UJ 2.1 UJ 2.1 UJ 2.1 UJ 2.1 UJ

TRNSFR BLNK 6/12/2007 2.0 U 2.0 U 2.0 U 2.0 U 2.0 U

CLE ELUM WP 9/18/2007 na na na na na

ELENSBURG WP 9/18/2007 na na na na na

KITTITAS WP 9/18/2007 na na na na na

SELAH WP 9/20/2007 5.1 UJ 5.1 UJ 5.1 UJ 5.1 UJ 5.1 UJ

NACHES WP 9/20/2007 5.0 UJ 5.0 UJ 5.0 UJ 5.0 UJ 5.0 UJ

COWICHE WP 9/20/2007 5.1 UJ 5.1 UJ 5.1 UJ 5.1 UJ 5.1 UJ

YAKIMA WP 9/20/2007 5.1 UJ 5.1 UJ 5.1 UJ 5.1 UJ 5.1 UJ

MOXEE WP 9/25/2007 4.9 UJ 4.9 UJ 4.9 UJ 4.9 UJ 4.9 UJ

BUENA WP 9/25/2007 5.2 UJ 5.2 UJ 5.2 UJ 5.2 UJ 5.2 UJ

ZILLAH WP 9/25/2007 5.3 U 5.3 U 5.3 U 5.3 U 5.3 U

GRANGER WP 9/25/2007 5.1 U 5.1 U 5.1 U 5.1 U 5.1 U

SUNNYSIDE WP 9/25/2007 5.1 UJ 5.1 UJ 5.1 UJ 5.1 UJ 5.1 UJ

SUNYSIDE REP 9/25/2007 5.2 UJ 5.2 UJ 5.2 UJ 5.2 UJ 5.2 UJ

SS PORT WP 9/25/2007 5.1 UJ 5.1 UJ 5.1 UJ 5.1 UJ 5.1 UJ

MABTON WP 9/25/2007 5.1 U 5.1 U 5.1 U 5.1 U 5.1 U

GRANDVIEW WP 9/25/2007 5.2 UJ 5.2 UJ 5.2 UJ 5.2 UJ 5.2 UJ

PROSSER WP 9/27/2007 5.3 UJ 5.3 UJ 5.3 UJ 5.3 UJ 5.3 UJ

BENTON WP 9/27/2007 5.4 UJ 5.4 UJ 5.4 UJ 5.4 UJ 5.4 UJ

W RICHLAND WP 9/27/2007 5.5 UJ 5.5 UJ 5.5 UJ 5.5 UJ 5.5 UJ

W RICHLAND REP 9/27/2007 5.5 UJ 5.5 UJ 5.5 UJ 5.5 UJ 5.5 UJ

TRNSFR BLANK na na na na na

BOTTLE BLANK na na na na na

Cis-Nonachlor 

(ng/L) 

Trans-Chlordane 

(ng/L) 

Trans-Nonachlor 

(ng/L)

Oxychlordane 

(ng/L)

Cis-Chlordane 

(ng/L)
Yakima Pesticides/PCBs TMDL: Vol 1, WQ Study Findings 

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Collection 

Field ID Date (ng/L) (ng/L) (ng/L) (ng/L) (ng/L) (ng/L)

CLE ELUM WP 6/12/2007 na na na na na na

ELLENSBURG WP 6/12/2007 na na na na na na

ELLENSBURG REP 6/12/2007 na na na na na na

KITTITAS WP 6/12/2007 na na na na na na

SELAH WP 6/7/2007 26.0 UJ 26 UJ 2.1 UJ 2.1 UJ 2.1 UJ 2.1 UJ

NACHES WP 6/7/2007 26.0 UJ 26 UJ 2.1 UJ 2.1 UJ 2.1 UJ 2.1 UJ

COWICHE WP 6/7/2007 25.0 UJ 25 UJ 2.0 UJ 2.0 UJ 2.0 UJ 2.0 UJ

YAKIMA WP 6/7/2007 26.0 UJ 26 UJ 2.1 UJ 2.5 UJ 2.1 UJ 2.1 UJ

YAKIMA REP 6/7/2007 26.0 UJ 26 UJ 2.1 UJ 3.0 UJ 2.1 UJ 2.1 UJ

MOXEE WP 6/12/2007 25.0 UJ 25 UJ 2.0 UJ 2.0 UJ 2.0 UJ 2.0 UJ

BUENA WP 6/12/2007 25.0 UJ 25 UJ 2.0 UJ 2.0 UJ 2.0 UJ 2.0 UJ

ZILLAH WP 6/12/2007 26.0 UJ 26 UJ 2.1 UJ 2.1 UJ 2.1 UJ 2.1 UJ

GRANGER WP 6/12/2007 26.0 UJ 26 UJ 2.1 UJ 2.1 UJ 2.1 UJ 2.1 UJ

SUNNYSIDE WP 6/12/2007 25.0 UJ 25 UJ 2.0 UJ 2.0 UJ 2.0 UJ 2.0 UJ

SS PORT WP 6/12/2007 26.0 UJ 26 UJ 2.0 UJ 2.0 UJ 2.0 UJ 2.0 UJ

MABTON WP 6/12/2007 25.0 UJ 25 UJ 2.0 UJ 2.0 UJ 2.0 UJ 2.0 UJ

GRANDVIEW WP 6/12/2007 25.0 UJ 25 UJ 2.0 UJ 2.0 UJ 2.0 UJ 2.0 UJ

PROSSER WP 6/14/2007 27.0 UJ 27 UJ 2.2 UJ 2.2 UJ 2.2 UJ 2.2 UJ

BENTONC WP 6/14/2007 26.0 UJ 26 UJ 2.1 UJ 2.1 UJ 2.1 UJ 2.1 UJ

W RICHLAND 6/14/2007 26.0 UJ 26 UJ 2.1 UJ 2.1 UJ 2.1 UJ 2.1 UJ

TRNSFR BLANK 6/12/2007 25.0 UJ 25 UJ 2.0 UJ 2.0 UJ 2.0 UJ 2.0 UJ

CLE ELUM WP 9/18/2007 na na na na na na

ELLENSBURG WP 9/18/2007 na na na na na na

KITTITAS WP 9/18/2007 na na na na na na

SELAH WP 9/20/2007 na 26 UJ 5.1 UJ 5.1 UJ 5.1 UJ 5.1 UJ

NACHES WP 9/20/2007 na 25 UJ 5.0 UJ 5.0 UJ 5.0 UJ 5.0 UJ

COWICHE WP 9/20/2007 na 25 UJ 5.1 UJ 5.1 UJ 5.1 UJ 5.1 UJ

YAKIMA WP 9/20/2007 na 26 UJ 5.1 UJ 5.1 UJ 5.1 UJ 5.1 UJ

MOXEE WP 9/25/2007 na 25 UJ 4.9 UJ 4.9 UJ 4.9 UJ 4.9 UJ

BUENA WP 9/25/2007 na 26 UJ 5.2 UJ 5.2 UJ 5.2 UJ 5.2 UJ

ZILLAH WP 9/25/2007 na 26 U 5.3 U 5.3 U 5.3 UJ 5.3 U

GRANGER WP 9/25/2007 na 25 U 5.1 U 5.1 U 5.1 UJ 5.1 U

SUNNYSIDE WP 9/25/2007 na 26 UJ 5.1 UJ 5.1 UJ 5.1 UJ 5.1 UJ

SUNYSIDE REP 9/25/2007 na 26 UJ 5.2 UJ 5.2 UJ 5.2 UJ 5.2 UJ

SS PORT WP 9/25/2007 na 26 UJ 5.1 UJ 5.1 UJ 5.1 UJ 5.1 UJ

MABTON WP 9/25/2007 na 26 U 5.1 U 5.1 U 5.1 UJ 5.1 U

GRANDVIEW WP 9/25/2007 na 26 UJ 5.2 UJ 5.2 UJ 5.2 UJ 5.2 UJ

PROSSER WP 9/27/2007 na 26 UJ 5.3 UJ 5.3 UJ 5.3 UJ 5.3 UJ

BENTON WP 9/27/2007 na 27 UJ 5.4 UJ 5.4 UJ 5.4 UJ 5.4 UJ

W RICHLAND 9/27/2007 na 27 UJ 5.5 UJ 5.5 UJ 5.5 UJ 5.5 UJ

W RICHLAND REP 9/27/2007 na 27 UJ 5.5 UJ 5.5 UJ 5.5 UJ 5.5 UJ

TRNSFR BLANK na na na na na na

BOTTLE BLNK na na na na na na

Chlordane 

(technical) Toxaphene

AlphaBHC Beta-BHC Delta-BHC Lindane

U = not detected at or above reported value J = estimated REJ = rejected na = not analyzed LS = lost in shipment 
Yakima Pesticides/PCBs TMDL: Vol 1, WQ Study Findings 

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Collection 

Field ID Date (ng/L) (ng/L) (ng/L) (ng/L) (ng/L) (ng/L)

CLE ELUM WP 6/12/2007 na na na na na na

ELLENSBURG WP 6/12/2007 na na na na na na

ELLENSBURG REP 6/12/2007 na na na na na na

KITTITAS WP 6/12/2007 na na na na na na

SELAH WP 6/7/2007 2.1 U 2.1 U 2.1 UJ 2.1 U 2.1 UJ 2.1 U

NACHES WP 6/7/2007 2.1 U 2.1 U 2.1 U 2.1 U 2.1 UJ 2.1 U

COWICHE WP 6/7/2007 2.0 U 2.0 U 2.0 UJ 2.0 U 2.0 UJ 2.0 U

YAKIMA WP 6/7/2007 2.1 U 2.1 UJ 2.1 UJ 2.1 U 2.1 UJ 2.1 U

YAKIMA REP 6/7/2007 2.1 U 2.2 UJ 2.1 UJ 2.1 U 2.1 UJ 2.1 U

MOXEE WP 6/12/2007 2.0 U 2.0 U 2.0 UJ 2.0 U 2.0 UJ 2.0 U

BUENA WP 6/12/2007 2.0 U 2.0 U 2.0 UJ 2.0 U 2.0 UJ 2.0 U

ZILLAH WP 6/12/2007 2.1 U 2.1 U 2.1 UJ 2.1 U 2.1 UJ 2.1 U

GRANGER WP 6/12/2007 2.1 U 2.1 U 2.1 UJ 2.1 U 2.1 UJ 2.1 U

SUNNYSIDE WP 6/12/2007 2.0 U 2.0 U 2.0 UJ 2.0 U 2.0 UJ 2.0 U

SS PORT WP 6/12/2007 2.0 UJ 2.0 UJ 2.0 UJ 2.0 UJ 2.0 UJ 2.0 UJ

MABTON WP 6/12/2007 2.0 U 2.0 U 2.0 UJ 2.0 U 2.0 UJ 2.0 U

GRANDVIEW WP 6/12/2007 2.0 U 2.0 U 2.0 UJ 2.0 U 2.0 UJ 2.0 U

PROSSER WP 6/14/2007 2.2 U 2.2 U 2.2 UJ 2.2 U 2.2 UJ 2.2 U

BENTONC WP 6/14/2007 2.1 U 2.1 U 2.1 UJ 2.1 U 2.1 UJ 2.1 U

W RICHLAND 6/14/2007 2.1 U 2.1 U 2.1 UJ 2.1 U 2.1 UJ 2.1 U

TRNSFR BLANK 6/12/2007 2.0 U 2.0 U 2.0 UJ 2.0 U 2.0 UJ 2.0 U

CLE ELUM WP 9/18/2007 na na na na na na

ELLENSBURG WP 9/18/2007 na na na na na na

KITTITAS WP 9/18/2007 na na na na na na

SELAH WP 9/20/2007 5.1 U 5.1 U 5.1 U 5.1 U 5.1 UJ 5.1 U

NACHES WP 9/20/2007 5.0 U 5.0 U 5.0 U 5.0 U 5.0 UJ 5.0 U

COWICHE WP 9/20/2007 5.1 U 5.1 U 5.1 U 5.1 U 5.1 UJ 5.1 U

YAKIMA WP 9/20/2007 5.1 U 5.1 U 5.1 U 5.1 U 5.1 UJ 5.1 U

MOXEE WP 9/25/2007 4.9 4.9 UJ 4.9 UJ 4.9 UJ 4.9 UJ 4.9 UJ

BUENA WP 9/25/2007 5.2 U 5.2 U 5.2 UJ 5.2 U 5.2 UJ 5.2 U

ZILLAH WP 9/25/2007 5.3 U 5.3 U 5.3 UJ 5.3 U 5.3 U 5.3 U

GRANGER WP 9/25/2007 5.1 U 5.1 U 5.1 UJ 5.1 U 5.1 U 5.1 U

SUNNYSIDE WP 9/25/2007 5.1 U 5.1 U 5.1 UJ 5.1 U 5.1 UJ 5.1 U

SUNYSIDE REP 9/25/2007 5.2 U 5.2 U 5.2 UJ 5.2 U 5.2 UJ 5.2 U

SS PORT WP 9/25/2007 5.1 5.1 UJ 5.1 UJ 5.1 UJ 5.1 UJ 5.1 UJ

MABTON WP 9/25/2007 5.1 U 5.1 U 5.1 UJ 5.1 U 5.1 U 5.1 U

GRANDVIEW WP 9/25/2007 5.2 U 5.2 U 5.2 UJ 5.2 U 5.2 UJ 5.2 U

PROSSER WP 9/27/2007 5.3 U 5.3 U 5.3 U 5.3 U 5.3 UJ 5.3 U

BENTON WP 9/27/2007 5.4 U 5.4 U 5.4 U 5.4 U 5.4 UJ 5.4 U

W RICHLAND 9/27/2007 5.5 U 5.5 U 5.5 U 5.5 U 5.5 UJ 5.5 U

W RICHLAND REP 9/27/2007 5.5 U 5.5 U 5.5 U 5.5 U 5.5 UJ 5.5 U

TRNSFR BLANK na na na na na na

BOTTLE BLNK na na na na na na

Aldrin

Endrin 

Ketone Heptachlor

Heptachlor 

Epoxide

Endrin 

Endrin Aldehyde

U = not detected at or above reported value J = estimated REJ = rejected na = not analyzed LS = lost in shipment 
Yakima Pesticides/PCBs TMDL: Vol 1, WQ Study Findings 

Page 294 

U = not detected at or above reported value J = estimated REJ = rejected na = not analyzed LS = lost in shipment 

Collection 

Field ID Date (ng/L) (ng/L) (pg/L) (mg/L) (NTU) (umhos/cm)

CLE ELUM WP 6/12/2007 na na 719 J 5 2.7 412

ELLENSBURG WP 6/12/2007 na na 192 J 4 1.8 381

ELLENSBURG REP 6/12/2007 na na 97 J 4 1.9 382

KITTITAS WP 6/12/2007 na na 42 J 3 1.7 439

SELAH WP 6/7/2007 2.1 UJ 2.1 U 7,360 7 2.9 849

NACHES WP 6/7/2007 2.1 UJ 2.1 U 40 UJ 2 2.1 298

COWICHE WP 6/7/2007 2.0 UJ 2.0 U 40 UJ 1 1.5 685

YAKIMA WP 6/7/2007 2.1 UJ 2.1 U 798 J 5 3.7 536

YAKIMA REP 6/7/2007 2.1 UJ 2.1 U na 5 3.0 534

MOXEE WP 6/12/2007 2.0 UJ 2.0 U 47 J 3 2.1 588

BUENA WP 6/12/2007 2.0 UJ 2.0 U 285 J 7 3.8 743

ZILLAH WP 6/12/2007 2.1 UJ 2.1 U 403 J 10 4.5 1100

GRANGER WP 6/12/2007 2.1 UJ 2.1 U 253 J 2 1.5 726

SUNNYSIDE WP 6/12/2007 2.0 UJ 2.0 U 747 J 2 1.1 801

SS PORT WP 6/12/2007 2.0 UJ 2.0 UJ 601 J 555 190 2440

MABTON WP 6/12/2007 2.0 UJ 2.0 UJ 31 J 5 1.7 857

GRANDVIEW WP 6/12/2007 2.0 UJ 2.0 U 50 UJ 23 8.9 1080

PROSSER WP 6/14/2007 2.2 UJ 2.2 U 406 J 7 4.0 914

BENTONC WP 6/14/2007 2.1 UJ 2.1 U 44 J 2 1.2 1260

W RICHLAND 6/14/2007 2.1 UJ 2.1 U 97 J 3 1.6 963

TRNSFR BLANK 6/12/2007 2.0 UJ 2.0 U 115 J na na na

CLE ELUM WP 9/18/2007 na na 262 J 2 1.7 330

ELLENSBURG WP 9/18/2007 na na 318 J 2 1.6 374

KITTITAS WP 9/18/2007 na na 143 J 2 0.9 432

SELAH WP 9/20/2007 5.1 UJ 5.1 U 246 J 11 4.0 868

NACHES WP 9/20/2007 5.0 UJ 5.0 U 245 J 14 4.4 304

COWICHE WP 9/20/2007 5.1 UJ 5.1 U 276 J 1 1.4 684

YAKIMA WP 9/20/2007 5.1 UJ 5.1 U 856 J 7 4.0 515

MOXEE WP 9/25/2007 4.9 UJ 4.9 UJ 387 J 5 3.8 620

BUENA WP 9/25/2007 5.2 UJ 5.2 U 288 J 2 1.9 740

ZILLAH WP 9/25/2007 5.3 U 5.3 U 223 J 3 1.9 1190

GRANGER WP 9/25/2007 5.1 U 5.1 U 226 J 2 1.2 709

SUNNYSIDE WP 9/25/2007 5.1 UJ 5.1 U 475 J 2 1.5 830

SUNYSIDE REP 9/25/2007 5.2 UJ 5.2 U 523 J 2 1.5 828

SS PORT WP 9/25/2007 5.1 UJ 5.1 163 J 77 22 3160

MABTON WP 9/25/2007 5.1 U 5.1 U 304 J 3 2.1 672

GRANDVIEW WP 9/25/2007 5.2 UJ 5.2 U 153 J 65 3.3 1140

PROSSER WP 9/27/2007 5.3 UJ 5.3 U 375 J 6 3.6 987

BENTON WP 9/27/2007 5.4 UJ 6.8 UJ 335 J 2 1.2 1240

W RICHLAND 9/27/2007 5.5 UJ 5.5 U 319 J 6 3.1 1010

W RICHLAND REP 9/27/2007 5.5 UJ 7.7 UJ 203 J 6 2.0 1010

TRNSFR BLANK na na 10 UJ na na na

BOTTLE BLNK na na 133 J na na na

Hexachlorobenzene Methoxychlor T-PCBs

Total 

Suspended 

Solids Turbidity Conductivity
Yakima Pesticides/PCBs TMDL: Vol 1, WQ Study Findings 

Page 295 

Collection Flow

Sample No. Field ID Date (mgd) (ng/L) (ng/L) (ng/L)

7508100 CLE ELUM WP 12/13/2007 0.471 na na na

7508102 ELLENSBURG WP 12/13/2007 3.239 na na na

7508101 KITTITAS WP 12/13/2007 0.142 na na na

7508103 SELAH WP 12/13/2007 1.347 2.5 UJ 2.5 UJ 2.5 UJ

7508107 SELAH REP 12/13/2007 - - 2.6 UJ 2.6 UJ 2.6 UJ

7508104 NACHES WP 12/12/2007 0.0697 2.5 UJ 2.5 UJ 2.5 UJ

7508105 COWICHE WP 12/12/2007 0.1057 2.6 UJ 2.6 UJ 2.6 UJ

7508106 YAKIMA WP 12/12/2007 9.82 2.7 UJ 2.7 UJ 2.7 UJ

7518105 MOXEE WP 12/18/2007 0.1515 2.5 UJ 2.5 UJ 2.5 UJ

7518103 BUENA WP 12/18/2007 0.080 2.6 UJ 2.6 UJ 2.6 UJ

7518104 ZILLAH WP 12/18/2007 0.2522 2.5 UJ 2.5 UJ 2.5 UJ

7518106 GRANGER WP 12/18/2007 0.171 2.5 UJ 2.5 UJ 2.5 UJ

7518107 SUNNYSIDE WP 12/18/2007 1.100 2.6 UJ 2.6 UJ 2.6 UJ

7518108 SS PORT WP 12/18/2007 0.3097 REJ REJ REJ

7518110 MABTON WP 12/18/2007 0.175 2.7 UJ 2.7 UJ 2.7 UJ

7518109 GRANDVIEW WP 12/18/2007 1.41 2.5 UJ 2.5 UJ 2.5 UJ

7518114 GRANDVIEW 12/18/2007 - - 2.5 UJ 2.5 UJ 2.5 UJ

7518111 PROSSER WP 12/20/2007 0.565 2.6 UJ 2.6 UJ 2.6 UJ

7518112 BENTONC WP 12/20/2007 0.230 2.6 UJ 2.6 UJ 2.6 UJ

7518113 W RICHLAND 12/20/2007 0.549 2.6 UJ 2.6 UJ 2.6 UJ

7518116 BOTTLE BLNK 12/18/2007 - - 2.6 U 2.6 U 2.6 U

7518115 TRNSFR BLANK 12/18/2007 - - 2.5 U 2.5 U 2.5 U

8118825 CLE ELUM WP 3/11/2008 1.315 na na na

8118827 ELLENSBURG WP 3/11/2008 2.750 na na na

8118826 KITTITAS WP 3/11/2008 0.129 na na na

8118828 SELAH WP 3/11/2008 1.132 2.6 U 2.6 U 2.6 U

8118829 NACHES WP 3/13/2008 0.054 2.6 U 2.6 U 2.6 U

8118830 COWICHE WP 3/13/2008 0.211 2.5 U 2.5 U 2.5 U

8118831 YAKIMA WP 3/13/2008 9.240 2.5 U 2.5 U 2.5 U

8118832 YAKIMA REP 3/13/2008 - - 2.6 U 2.6 U 2.6 U

8128840 MOXEE WP 3/18/2008 0.151 2.6 U 2.6 U 2.6 U

8128838 BUENA WP 3/18/2008 0.074 2.6 U 2.6 U 2.6 U

8128839 ZILLAH WP 3/18/2008 0.215 2.6 UJ 2.6 UJ 2.6 UJ

8128841 GRANGER WP 3/18/2008 0.172 2.6 U 2.6 U 2.6 U

8128842 SUNNYSIDE WP 3/18/2008 1.067 2.6 U 2.6 U 2.6 U

8128843 SS PORT WP 3/18/2008 0.538 2.6 UJ 2.6 UJ 2.6 UJ

8128845 MABTON WP 3/18/2008 1.270 2.6 UJ 2.6 UJ 2.6 UJ

8128844 GRANDVIEW WP 3/18/2008 1.080 2.6 U 2.6 U 2.6 U

8128846 PROSSER WP 3/20/2008 0.652 2.6 UJ 2.6 UJ 2.6 UJ

8128849 PROSSER REP 3/20/2008 - - 2.6 U 2.6 U 2.6 U

8128847 BENTONC WP 3/20/2008 0.225 2.6 U 2.6 U 2.6 U

8128848 W RICHLAND 3/20/2008 0.523 2.6 U 2.6 U 2.6 U

8128850 TRNSFR BLANK 3/20/2008 - - 2.6 UJ 2.6 UJ 2.6 UJ

8128851 BOTTLE BLANK 3/20/2008 na na na

4,4'-DDD 4,4'-DDE 4,4'-DDT

U = not detected at or above reported value J = estimated REJ = rejected na = not analyzed LS = lost in shipment 
Yakima Pesticides/PCBs TMDL: Vol 1, WQ Study Findings 

Page 296 

Collection 

Field ID Date (ng/L) (ng/L) (ng/L) (ng/L) (ng/L)

CLE ELUM WP 12/13/2007 na na na na na

ELLENSBURG WP 12/13/2007 na na na na na

KITTITAS WP 12/13/2007 na na na na na

SELAH WP 12/13/2007 2.5 U 2.5 U 2.5 U 3.1 6.1

SELAH REP 12/13/2007 2.6 U 2.6 U 2.6 U 2.9 6.3

NACHES WP 12/12/2007 2.5 U 2.5 U 2.5 U 2.5 U 2.5 U

COWICHE WP 12/12/2007 2.6 U 6.7 J 2.9 J 25 21

YAKIMA WP 12/12/2007 2.7 U 3.3 J 2.7 U 5.4 4.4 J

MOXEE WP 12/18/2007 2.5 U 3.7 J 2.5 U 2.5 U 2.5 U

BUENA WP 12/18/2007 2.6 U 2.6 U 2.6 U 2.6 U 4.5 J

ZILLAH WP 12/18/2007 2.5 U 3.7 2.5 U 2.5 U 6.7 J

GRANGER WP 12/18/2007 2.5 U 5.7 J 2.5 U 2.5 U 2.5 U

SUNNYSIDE WP 12/18/2007 2.6 U 4.8 J 2.6 U 2.6 U 6.2 J

SS PORT WP 12/18/2007 REJ REJ REJ REJ REJ

MABTON WP 12/18/2007 2.7 U 2.7 J 2.7 U 2.7 U 2.7 U

GRANDVIEW WP 12/18/2007 2.5 UJ 2.5 UJ 2.5 UJ 2.5 UJ 3.2 J

GRANDVIEW 12/18/2007 2.5 U 2.5 U 2.5 U 2.5 U 3.1 J

PROSSER WP 12/20/2007 2.6 U 2.6 U 2.6 U 2.6 U 2.6 U

BENTONC WP 12/20/2007 2.6 U 2.6 U 2.6 U 2.6 U 2.6 U

W RICHLAND 12/20/2007 2.6 U 2.6 J 2.6 U 2.6 U 2.6 U

BOTTLE BLNK 12/18/2007 2.6 U 2.6 U 2.6 U 2.6 U 2.6 U

TRNSFR BLANK 12/18/2007 2.5 U 2.5 U 2.5 U 2.5 U 2.5 U

CLE ELUM WP 3/11/2008 na na na na na

ELLENSBURG WP 3/11/2008 na na na na na

KITTITAS WP 3/11/2008 na na na NA na

SELAH WP 3/11/2008 2.6 UJ 2.6 UJ 2.6 UJ 2.6 UJ 4.8 J

NACHES WP 3/13/2008 2.6 U 2.6 U 2.6 U 2.6 U 2.6 U

COWICHE WP 3/13/2008 2.5 U 3.6 J 6.3 32 17

YAKIMA WP 3/13/2008 2.5 UJ 3.9 J 38 J 7.8 J 4.5 J

YAKIMA REP 3/13/2008 2.6 UJ 2.6 UJ 37 J 8.0 J 5.2 J

MOXEE WP 3/18/2008 2.6 UJ 2.6 UJ 2.6 UJ 2.6 UJ 2.6 UJ

BUENA WP 3/18/2008 2.6 UJ 2.6 UJ 2.6 UJ 2.6 UJ 2.6 UJ

ZILLAH WP 3/18/2008 2.6 UJ 2.6 UJ 2.6 UJ 2.6 UJ 2.6 UJ

GRANGER WP 3/18/2008 2.6 UJ 2.6 UJ 2.6 UJ 2.6 UJ 2.6 UJ

SUNNYSIDE WP 3/18/2008 2.6 UJ 11 J 2.6 UJ 2.6 UJ 2.6 UJ

SS PORT WP 3/18/2008 2.6 UJ 2.6 UJ 2.6 UJ 2.6 UJ 2.6 UJ

MABTON WP 3/18/2008 2.6 UJ 9.5 J 3.3 J 2.6 UJ 2.6 UJ

GRANDVIEW WP 3/18/2008 2.6 UJ 2.6 UJ 2.6 UJ 2.6 UJ 2.6 UJ

PROSSER WP 3/20/2008 2.6 UJ 2.6 UJ 2.6 UJ 2.6 UJ 2.6 UJ

PROSSER REP 3/20/2008 2.6 UJ 2.6 UJ 2.6 UJ 2.6 UJ 2.6 UJ

BENTONC WP 3/20/2008 2.6 UJ 2.6 UJ 2.6 UJ 2.6 UJ 2.6 UJ

W RICHLAND 3/20/2008 2.6 UJ 2.6 UJ 2.6 UJ 2.6 UJ 2.6 UJ

TRNSFR BLANK 3/20/2008 2.6 UJ 2.6 UJ 2.6 UJ 2.6 UJ 2.6 UJ

BOTTLE BLANK 3/20/2008 na na na na na

Dieldrin Chlorpyrifos Endosulfan I

Endosulfan 

II

Endosulfan 

Sulfate

U = not detected at or above reported value J = estimated REJ = rejected na = not analyzed LS = lost in shipment 
Yakima Pesticides/PCBs TMDL: Vol 1, WQ Study Findings 

Page 297 

Collection 

Field ID Date (ng/L) (ng/L) (ng/L) (ng/L) (ng/L)

CLE ELUM WP 12/13/2007 na na na na na

ELLENSBURG WP 12/13/2007 na na na na na

KITTITAS WP 12/13/2007 na na na na na

SELAH WP 12/13/2007 2.5 UJ 2.5 UJ 2.5 UJ 2.5 UJ 2.5 UJ

SELAH REP 12/13/2007 2.6 UJ 2.6 UJ 2.6 UJ 2.6 UJ 2.6 UJ

NACHES WP 12/12/2007 2.5 UJ 2.5 UJ 2.5 UJ 2.5 UJ 2.5 UJ

COWICHE WP 12/12/2007 2.6 UJ 2.6 UJ 2.6 UJ 2.6 UJ 2.6 UJ

YAKIMA WP 12/12/2007 2.7 UJ 2.7 UJ 2.7 UJ 2.7 UJ 2.7 UJ

MOXEE WP 12/18/2007 2.5 UJ 2.5 UJ 2.5 UJ 2.5 UJ 2.5 UJ

BUENA WP 12/18/2007 2.6 UJ 2.6 UJ 2.6 UJ 2.6 UJ 2.6 UJ

ZILLAH WP 12/18/2007 2.5 UJ 2.5 UJ 2.5 UJ 2.5 UJ 2.5 UJ

GRANGER WP 12/18/2007 2.5 UJ 2.5 UJ 2.5 UJ 2.5 UJ 2.5 UJ

SUNNYSIDE WP 12/18/2007 2.6 UJ 2.6 UJ 2.6 UJ 2.6 UJ 2.6 UJ

SS PORT WP 12/18/2007 REJ REJ REJ REJ REJ

MABTON WP 12/18/2007 2.7 UJ 2.7 UJ 2.7 UJ 2.7 UJ 2.7 UJ

GRANDVIEW WP 12/18/2007 2.5 UJ 2.5 UJ 2.5 UJ 2.5 UJ 2.5 UJ

GRANDVIEW 12/18/2007 2.5 UJ 2.5 UJ 2.5 UJ 2.5 UJ 2.5 UJ

PROSSER WP 12/20/2007 2.6 UJ 2.6 UJ 2.6 UJ 2.6 UJ 2.6 UJ

BENTONC WP 12/20/2007 2.6 UJ 2.6 UJ 2.6 UJ 2.6 UJ 2.6 UJ

W RICHLAND 12/20/2007 2.6 UJ 2.6 UJ 2.6 UJ 2.6 UJ 2.6 UJ

BOTTLE BLNK 12/18/2007 2.6 U 2.6 U 2.6 U 2.6 U 2.6 U

TRNSFR BLANK 12/18/2007 2.5 U 2.5 U 2.5 U 2.5 U 2.5 U

CLE ELUM WP 3/11/2008 na na na na na

ELLENSBURG WP 3/11/2008 na na na na na

KITTITAS WP 3/11/2008 na na na na na

SELAH WP 3/11/2008 2.6 U 2.6 U 2.6 U 2.6 U 2.6 U

NACHES WP 3/13/2008 2.6 U 2.6 U 2.6 U 2.6 U 2.6 U

COWICHE WP 3/13/2008 2.5 U 2.5 U 2.5 U 2.5 U 2.5 U

YAKIMA WP 3/13/2008 2.5 U 2.5 U 2.5 U 2.5 U 2.5 U

YAKIMA REP 3/13/2008 2.6 U 2.6 U 2.6 U 2.6 U 2.6 U

MOXEE WP 3/18/2008 2.6 U 2.6 U 2.6 U 2.6 U 2.6 U

BUENA WP 3/18/2008 2.6 U 2.6 U 2.6 U 2.6 U 2.6 U

ZILLAH WP 3/18/2008 2.6 UJ 2.6 UJ 2.6 UJ 2.6 UJ 2.6 UJ

GRANGER WP 3/18/2008 2.6 U 2.6 U 2.6 U 2.6 U 2.6 U

SUNNYSIDE WP 3/18/2008 2.6 U 2.6 U 2.6 U 2.6 U 2.6 U

SS PORT WP 3/18/2008 2.6 UJ 2.6 UJ 2.6 UJ 2.6 UJ 2.6 UJ

MABTON WP 3/18/2008 2.6 UJ 2.6 UJ 2.6 UJ 2.6 UJ 2.6 UJ

GRANDVIEW WP 3/18/2008 2.6 U 2.6 U 2.6 U 2.6 U 2.6 U

PROSSER WP 3/20/2008 2.6 UJ 2.6 UJ 2.6 UJ 2.6 UJ 2.6 UJ

PROSSER REP 3/20/2008 2.6 U 2.6 U 2.6 U 2.6 U 2.6 U

BENTONC WP 3/20/2008 2.6 U 2.6 U 2.6 U 2.6 U 2.6 U

W RICHLAND 3/20/2008 2.6 U 2.6 U 2.6 U 2.6 U 2.6 U

TRNSFR BLANK 3/20/2008 2.6 UJ 2.6 UJ 2.6 UJ 2.6 UJ 2.6 UJ

BOTTLE BLANK 3/20/2008 na na na na na

CisChlordaneCisNonachlorTransChlordane TransNonachlor Oxychlordane

U = not detected at or above reported value J = estimated REJ = rejected na = not analyzed LS = lost in shipment 
Yakima Pesticides/PCBs TMDL: Vol 1, WQ Study Findings 

Page 298 

Collection 

Field ID Date (ng/L) (ng/L) (ng/L) (ng/L) (ng/L)

CLE ELUM WP 12/13/2007 na na na na na na

ELLENSBURG WP 12/13/2007 na na na na na na

KITTITAS WP 12/13/2007 na na na na na na

SELAH WP 12/13/2007 na 25 UJ 2.5 UJ 2.5 UJ 2.5 UJ 2.5 UJ

SELAH REP 12/13/2007 na 26 UJ 2.6 UJ 2.6 UJ 2.6 UJ 2.6 UJ

NACHES WP 12/12/2007 na 25 UJ 2.5 UJ 2.5 UJ 2.5 UJ 2.5 UJ

COWICHE WP 12/12/2007 na 26 UJ 2.6 UJ 2.6 UJ 2.6 UJ 2.6 UJ

YAKIMA WP 12/12/2007 na 27 UJ 2.7 UJ 2.7 UJ 2.7 UJ 2.7 UJ

MOXEE WP 12/18/2007 na 25 UJ 2.5 UJ 2.5 UJ 2.5 UJ 2.5 UJ

BUENA WP 12/18/2007 na 26 UJ 2.6 UJ 2.6 UJ 2.6 UJ 2.6 UJ

ZILLAH WP 12/18/2007 na 25 UJ 2.5 UJ 2.5 UJ 2.5 UJ 2.5 UJ

GRANGER WP 12/18/2007 na 25 UJ 2.5 UJ 2.5 UJ 2.5 UJ 2.5 UJ

SUNNYSIDE WP 12/18/2007 na 26 UJ 2.6 UJ 2.6 UJ 2.6 UJ 2.6 UJ

SS PORT WP 12/18/2007 na REJ REJ REJ REJ REJ

MABTON WP 12/18/2007 na 27 UJ 2.7 UJ 2.7 UJ 2.7 UJ 2.7 UJ

GRANDVIEW WP 12/18/2007 na 25 UJ 2.5 UJ 2.5 UJ 2.5 UJ 2.5 UJ

GRANDVIEW 12/18/2007 na 25 UJ 2.5 UJ 2.5 UJ 2.5 UJ 2.5 UJ

PROSSER WP 12/20/2007 na 26 UJ 2.6 UJ 2.6 UJ 2.6 UJ 2.6 UJ

BENTONC WP 12/20/2007 na 26 UJ 2.6 UJ 2.6 UJ 2.6 UJ 2.6 UJ

W RICHLAND 12/20/2007 na 26 UJ 2.6 UJ 2.6 UJ 2.6 UJ 2.6 UJ

BOTTLE BLNK 12/18/2007 na 26 U 2.6 U 2.6 U 2.6 U 2.6 U

TRNSFR BLANK 12/18/2007 na 25 U 2.5 U 2.5 U 2.5 U 2.5 U

CLE ELUM WP 3/11/2008 na na na na na na

ELLENSBURG WP 3/11/2008 na na na na na na

KITTITAS WP 3/11/2008 na na na na na na

SELAH WP 3/11/2008 na 26 U 2.6 U 2.6 U 13 U 2.6 U

NACHES WP 3/13/2008 na 26 U 2.6 U 2.6 U 13 U 2.6 U

COWICHE WP 3/13/2008 na 25 U 2.5 U 2.5 U 13 U 2.5 U

YAKIMA WP 3/13/2008 na 25 U 2.5 U 7.6 UJ 13 U 11

YAKIMA REP 3/13/2008 na 26 U 2.6 U 7.3 UJ 13 U 15

MOXEE WP 3/18/2008 na 26 U 2.6 U 2.6 U 13 U 2.6 U

BUENA WP 3/18/2008 na 26 U 2.6 U 2.6 U 13 U 2.6 U

ZILLAH WP 3/18/2008 na 26 UJ 2.6 UJ 2.6 UJ 13 UJ 2.6 UJ

GRANGER WP 3/18/2008 na 26 U 2.6 U 2.6 U 13 U 2.6 U

SUNNYSIDE WP 3/18/2008 na 26 U 2.6 U 2.6 U 13 U 7.4

SS PORT WP 3/18/2008 na 26 UJ 2.6 UJ 2.6 UJ 13 UJ 2.6 UJ

MABTON WP 3/18/2008 na 26 UJ 2.6 UJ 2.6 UJ 13 UJ 2.6 UJ

GRANDVIEW WP 3/18/2008 na 26 U 2.6 U 2.6 U 13 U 2.6 U

PROSSER WP 3/20/2008 na 26 UJ 2.6 UJ 2.6 UJ 13 UJ 2.6 UJ

PROSSER REP 3/20/2008 na 26 U 2.6 U 2.6 U 13 UJ 2.6 U

BENTONC WP 3/20/2008 na 26 U 2.6 U 2.6 U 13 U 2.6 U

W RICHLAND 3/20/2008 na 26 U 2.6 U 2.6 U 13 U 2.6 U

TRNSFR BLANK 3/20/2008 na 26 UJ 2.6 UJ 2.6 UJ 13 UJ 2.6 UJ

BOTTLE BLANK 3/20/2008 na na na na na na

Chlordane 

(technical) Toxaphene

AlphaBHC Beta-BHCDeltaBHC Lindane

U = not detected at or above reported value J = estimated REJ = rejected na = not analyzed LS = lost in shipment 
Yakima Pesticides/PCBs TMDL: Vol 1, WQ Study Findings 

Page 299 

Collection 

Field ID Date (ng/L) (ng/L) (ng/L) (ng/L) (ng/L) (ng/L)

CLE ELUM WP 12/13/2007 na na na na na na

ELLENSBURG WP 12/13/2007 na na na na na na

KITTITAS WP 12/13/2007 na na na na na na

SELAH WP 12/13/2007 2.5 U 2.5 U 2.5 U 2.5 U 2.5 UJ 2.5 U

SELAH REP 12/13/2007 2.6 U 2.6 U 2.6 U 2.6 U 2.6 UJ 2.6 U

NACHES WP 12/12/2007 2.5 U 2.5 U 2.5 U 2.5 U 2.5 UJ 2.5 U

COWICHE WP 12/12/2007 2.6 U 2.6 U 2.6 U 2.6 U 2.6 UJ 2.6 U

YAKIMA WP 12/12/2007 2.7 U 2.7 U 2.7 U 2.7 U 2.7 UJ 2.7 U

MOXEE WP 12/18/2007 2.5 U 2.5 U 2.5 U 2.5 U 2.5 UJ 2.5 U

BUENA WP 12/18/2007 2.6 U 2.6 U 2.6 U 2.6 U 2.6 UJ 2.6 U

ZILLAH WP 12/18/2007 2.5 U 2.5 U 2.5 U 2.5 U 2.5 UJ 2.5 U

GRANGER WP 12/18/2007 2.5 U 2.5 U 2.5 U 2.5 U 2.5 UJ 2.5 U

SUNNYSIDE WP 12/18/2007 2.6 U 2.6 U 2.6 U 2.6 U 2.6 UJ 2.6 U

SS PORT WP 12/18/2007 REJ REJ REJ REJ REJ REJ

MABTON WP 12/18/2007 2.7 U 2.7 U 2.7 U 2.7 U 2.7 UJ 2.7 U

GRANDVIEW WP 12/18/2007 2.5 UJ 2.5 UJ 2.5 UJ 2.5 U 2.5 UJ 2.5 UJ

GRANDVIEW 12/18/2007 2.5 U 2.5 U 2.5 U 2.5 U 2.5 UJ 2.5 U

PROSSER WP 12/20/2007 2.6 U 2.6 U 2.6 UJ 2.6 U 2.6 UJ 2.6 U

BENTONC WP 12/20/2007 2.6 U 2.6 U 2.6 UJ 2.6 U 2.6 UJ 2.6 U

W RICHLAND 12/20/2007 2.6 U 2.6 U 2.6 UJ 2.6 U 2.6 UJ 2.6 U

BOTTLE BLNK 12/18/2007 2.6 U 2.6 U 2.6 U 2.6 U 2.6 U 2.6 U

TRNSFR BLANK 12/18/2007 2.5 U 2.5 U 2.5 U 2.5 U 2.5 U 2.5 U

CLE ELUM WP 3/11/2008 na na na na na na

ELLENSBURG WP 3/11/2008 na na na na na na

KITTITAS WP 3/11/2008 na na na na na na

SELAH WP 3/11/2008 2.6 UJ 2.6 UJ 2.6 UJ 2.6 UJ 2.6 U 2.6 UJ

NACHES WP 3/13/2008 2.6 U 2.6 U 2.6 U 2.6 U 2.6 U 2.6 U

COWICHE WP 3/13/2008 2.5 U 2.5 U 2.7 UJ 2.5 U 2.5 U 2.5 U

YAKIMA WP 3/13/2008 2.5 UJ 2.5 J 3.6 UJ 2.5 UJ 2.5 U 2.5 UJ

YAKIMA REP 3/13/2008 2.6 UJ 2.6 UJ 3.7 UJ 2.6 UJ 2.6 U 2.6 UJ

MOXEE WP 3/18/2008 2.6 UJ 2.6 UJ 2.6 UJ 2.6 UJ 2.6 U 2.6 UJ

BUENA WP 3/18/2008 2.6 UJ 2.6 UJ 2.6 UJ 2.6 UJ 2.6 U 2.6 UJ

ZILLAH WP 3/18/2008 2.6 UJ 2.6 UJ 2.6 UJ 2.6 UJ 2.6 UJ 2.6 UJ

GRANGER WP 3/18/2008 2.6 UJ 2.6 UJ 2.6 UJ 2.6 UJ 2.6 U 2.6 UJ

SUNNYSIDE WP 3/18/2008 2.6 UJ 2.6 UJ 2.6 UJ 2.6 UJ 2.6 U 2.6 UJ

SS PORT WP 3/18/2008 2.6 UJ 2.6 UJ 2.6 UJ 2.6 UJ 2.6 UJ 2.6 UJ

MABTON WP 3/18/2008 2.6 UJ 2.6 UJ 2.6 UJ 2.6 UJ 2.6 UJ 2.6 UJ

GRANDVIEW WP 3/18/2008 2.6 UJ 2.6 UJ 2.6 UJ 2.6 UJ 2.6 U 2.6 UJ

PROSSER WP 3/20/2008 2.6 UJ 2.6 UJ 2.6 UJ 2.6 UJ 2.6 UJ 2.6 UJ

PROSSER REP 3/20/2008 2.6 UJ 2.6 UJ 2.6 UJ 2.6 UJ 2.6 U 2.6 UJ

BENTONC WP 3/20/2008 2.6 UJ 2.6 UJ 2.6 UJ 2.6 UJ 2.6 U 2.6 UJ

W RICHLAND 3/20/2008 2.6 UJ 2.6 UJ 2.6 UJ 2.6 UJ 2.6 U 2.6 UJ

TRNSFR BLANK 3/20/2008 2.6 UJ 2.6 UJ 2.6 UJ 2.6 UJ 2.6 UJ 2.6 UJ

BOTTLE BLANK 3/20/2008 na na na na na na

Aldrin

Endrin 

Ketone Heptachlor

Heptachlor 

Endrin Epoxide

Endrin 

Aldehyde

U = not detected at or above reported value J = estimated REJ = rejected na = not analyzed LS = lost in shipment 
Yakima Pesticides/PCBs TMDL: Vol 1, WQ Study Findings 

Page 300 

Collection 

Field ID Date (ng/L) (ng/L) (pg/L) (mg/L) (NTU) (umhos/cm)

CLE ELUM WP 12/13/2007 na na 279 J 2 1.5 463

ELLENSBURG WP 12/13/2007 na na 2,067 J 4 2.2 443

KITTITAS WP 12/13/2007 na na 376 J 1 U 0.7 445

SELAH WP 12/13/2007 2.5 UJ 2.5 U 322 J 8 3.9 931

SELAH REP 12/13/2007 2.6 UJ 2.6 U 342 J 7 3.5 930

NACHES WP 12/12/2007 2.5 UJ 2.5 U 380 J 3 2.4 412

COWICHE WP 12/12/2007 2.6 UJ 2.6 U 857 J 2 1.7 638

YAKIMA WP 12/12/2007 2.7 UJ 2.7 U 932 J 3 2.4 548

MOXEE WP 12/18/2007 2.5 UJ 2.8 UJ 192 J 5 2.8 673

BUENA WP 12/18/2007 2.6 UJ 2.6 U 267 J 2 1.5 740

ZILLAH WP 12/18/2007 2.5 UJ 2.9 UJ 285 J 3 2.0 1300

GRANGER WP 12/18/2007 2.5 UJ 2.5 U 299 J 6 5.2 757

SUNNYSIDE WP 12/18/2007 2.6 UJ 3.3 UJ 967 J 3 1.6 894

SS PORT WP 12/18/2007 REJ REJ 510 J 247 6.5 3250

MABTON WP 12/18/2007 2.7 UJ 2.7 U 284 J 8 4.8 627

GRANDVIEW WP 12/18/2007 2.5 UJ 2.5 UJ LS 26 7.5 1140

GRANDVIEW 12/18/2007 2.5 UJ 2.5 U 121 J 25 6.9 1150

PROSSER WP 12/20/2007 2.6 UJ 2.9 UJ 599 J 16 5.1 869

BENTONC WP 12/20/2007 2.6 UJ 2.6 U 260 J 14 4.1 1450

W RICHLAND 12/20/2007 2.6 UJ 2.6 U 350 J 8 4.6 1060

BOTTLE BLNK 12/18/2007 2.6 U 2.6 U 579 J na na na

TRNSFR BLANK 12/18/2007 2.5 U 2.5 U 516 J na na na

CLE ELUM WP 3/11/2008 na na 571 J 2 1.5 J 340

ELLENSBURG WP 3/11/2008 na na 713 J 4 1.3 J 433

KITTITAS WP 3/11/2008 na na 377 J 2 0.8 J 442

SELAH WP 3/11/2008 2.6 UJ 2.6 UJ 962 J 25 9.2 J 798

NACHES WP 3/13/2008 2.6 UJ 2.6 UJ 443 J 4 2.8 444

COWICHE WP 3/13/2008 2.5 UJ 2.7 UJ 680 J 2 1.2 588

YAKIMA WP 3/13/2008 2.5 UJ 4.9 UJ 1,382 J 4 2.4 645

YAKIMA REP 3/13/2008 2.6 UJ 5.1 UJ 434 J 4 2.3 644

MOXEE WP 3/18/2008 2.6 U 2.6 UJ 355 J 5 2.8 J 681

BUENA WP 3/18/2008 2.6 U 2.6 UJ 626 J 7 3.1 J 759

ZILLAH WP 3/18/2008 2.6 UJ 2.6 UJ 1,186 J 5 2.2 J 1450

GRANGER WP 3/18/2008 2.6 U 2.6 UJ 801 J 3 1.8 J 776

SUNNYSIDE WP 3/18/2008 2.6 U 2.6 UJ 1,106 J 2 1.9 J 840

SS PORT WP 3/18/2008 2.6 UJ 2.6 UJ 1,323 J 36 12 J 3150

MABTON WP 3/18/2008 2.6 UJ 2.6 UJ 2,370 J 71 32 J 639

GRANDVIEW WP 3/18/2008 2.6 U 2.6 UJ 463 J 19 5.4 J 1260

PROSSER WP 3/20/2008 2.6 UJ 2.6 UJ 493 J 1 U 0.8 997

PROSSER REP 3/20/2008 2.6 U 2.6 UJ 387 J 1 0.7 996

BENTONC WP 3/20/2008 2.6 U 2.6 UJ 749 J 3 2.1 1250

W RICHLAND 3/20/2008 2.6 U 2.6 UJ 531 J na 1.3 1020

TRNSFR BLANK 3/20/2008 2.6 UJ 2.6 UJ 184 J na na na

BOTTLE BLANK 3/20/2008 na na 640 J na na na

Hexachlorobenzene Methoxychlor T-PCBs

Total 

Suspended 

Solids Turbidity Conductivity

 U = not detected at or above reported value J = estimated REJ = rejected na = not analyzed LS = lost in shipment 
Yakima Pesticides/PCBs TMDL: Vol 1, WQ Study Findings 

Page 301 

Appendix O. Fruit Packer and Vegetable Processor Effluent 

Data, 2007-08 

Collection Flow

Sample No. Field ID Date (mgd) (ng/L) (ng/L) (ng/L)

7308986 ANDRUS 7/26/2007 0.0048 0.35 J 3.1 J 3.0 J

7308983 APPLE KING 7/26/2007 0.0058 1.1 J 1.7 J 0.062 UJ

7308984 GILBERT 7/26/2007 0.0054 0.063 UJ 0.096 J 0.063 UJ

7314010 SNOKIST 7/30/2007 0.162 0.061 U 0.061 U 0.097 J

7308987 TWIN CITY 7/26/2007 0.261 0.064 UJ 0.064 UJ 0.064 UJ

7308982 ZIRKLE FRUIT 7/26/2007 0.166 0.12 J 0.21 UJ 0.063 UJ

7308988 ZIRKLE REP 7/26/2007 - - 0.13 J 0.21 J 0.063 UJ

7308989 TRNSFR BLNK 7/26/2007 - - 0.065 UJ 0.065 UJ 0.065 UJ

7418900 ANDRUS 10/10/2007 0.0030 0.84 J 3.0 J 1.2 J

7388864 APPLE KING 9/20/2007 0.0058 1.7 2.7 J 0.061 U

7398820 GILBERT 9/25/2007 0.0054 0.064 UJ 0.064 UJ 0.064 UJ

7388865 SNOKIST 9/20/2007 1.0360 0.62 0.062 UJ 0.062 U

7398821 TWIN CITY 9/27/2007 0.3910 0.061 UJ 0.061 UJ 0.061 UJ

7398823 TWIN REP 9/27/2007 - - 0.061 UJ 0.061 UJ 0.061 UJ

7388863 ZIRKLE FRUIT 9/18/2007 0.0827 0.23 J 0.69 J 0.063 U

7508111 ANDRUS 12/12/2007 0.0030 0.44 J 0.37 J 0.067 J

7508109 APPLE KING 12/12/2007 0.0058 0.39 J 0.44 J 0.068 J

7508112 APPLE REP 12/12/2007 - - 0.44 J 0.45 J 0.088 J

7518100 GILBERT 12/18/2007 0.0054 0.067 J 1.6 J 1.7 J

7508110 SNOKIST 12/12/2007 0.25 0.062 UJ 0.062 UJ 0.062 UJ

7518101 CON AGRA* 12/18/2007 0.23 0.063 U 0.063 U 0.063 U

7508108 ZIRKLE FRUIT 12/13/2007 0.11 0.062 J 0.65 J 0.24 J

7508113 TRNSFR BLNK 12/12/2007 - - 0.063 U 0.063 U 0.063 U

 - - ANDRUS - -

not 

processing

8118821 APPLE KING 3/13/2008 0.0058 0.52 J 1.2 J 0.16 J

8128833 GILBERT 3/18/2008 0.0054 1.6 J 6.8 4.6 J

8128835 SNOKIST 3/20/2008 0.21 0.12 J 0.067 0.063 U

8128836 SNOKIST REP 3/20/2008 - - 0.063 U 0.063 U 0.063 U

8128834 CON AGRA* 3/19/2008 0.34 0.063 UJ 0.063 UJ 0.063 UJ

8118820 ZIRKLE 3/11/2008 0.089 0.49 J 0.37 J 0.18 J

8128837 TRNSFR BLNK 3/19/2008 - - 0.063 U 0.063 U 0.063 UJ

U = not detected at or above reported value

J = estimated 

REJ = rejected

na = not analyzed

*Twin City sold to Con Agra Foods Oct 07

4,4'-DDD 4,4'-DDE 4,4'-DDT
Yakima Pesticides/PCBs TMDL: Vol 1, WQ Study Findings 

Page 302 

Collection

Field ID Date (ng/L) (ng/L) (ng/L) (ng/L) (ng/L) (ng/L)

ANDRUS 7/26/2007 0.87 J 2.9 J 0.062 UJ 0.062 UJ 0.062 UJ 0.062 UJ

APPLE KING 7/26/2007 1.9 J 1.0 UJ 0.062 UJ 0.062 UJ 0.062 UJ 0.062 UJ

GILBERT 7/26/2007 0.08 J 0.26 J 0.063 UJ 0.063 UJ 0.063 UJ 0.063 UJ

SNOKIST 7/30/2007 0.43 J 0.99 0.061 U 0.061 U 0.061 U 0.061 U

TWIN CITY 7/26/2007 2.5 J 1.2 UJ 0.064 UJ 0.064 UJ 0.088 J 0.064 UJ

ZIRKLE FRUIT 7/26/2007 0.84 UJ 7.9 UJ 0.063 UJ 0.063 UJ 0.063 UJ 0.063 UJ

ZIRKLE REP 7/26/2007 1.3 UJ 17 UJ 0.063 UJ 0.063 UJ 0.063 UJ 0.063 UJ

TRNSFR BLNK 7/26/2007 0.065 UJ 0.12 UJ 0.065 UJ 0.065 UJ 0.065 UJ 0.065 UJ

ANDRUS 10/10/2007 0.32 UJ 19 J 0.064 UJ 0.24 UJ 0.064 UJ 0.064 UJ

APPLE KING 9/20/2007 1.1 UJ 1.2 UJ 0.061 U 0.28 UJ 0.23 UJ 0.061 U

GILBERT 9/25/2007 0.86 J 2.5 J 0.064 UJ 1.3 J 0.064 UJ 0.064 UJ

SNOKIST 9/20/2007 0.062 U 0.091 UJ 0.062 U 0.062 U 0.093 UJ 0.062 U

TWIN CITY 9/27/2007 0.078 0.25 J 0.061 U 0.061 U 0.061 U 0.061 U

TWIN REP 9/27/2007 0.061 U 0.42 J 0.061 U 0.061 U 0.061 U 0.061 U

ZIRKLE FRUIT 9/18/2007 0.59 UJ 74 UJ 0.063 U 0.063 U 0.063 U 0.063 U

ANDRUS 12/12/2007 0.082 UJ 1.6 J 0.068 J 0.063 UJ 0.21 J 0.063 UJ

APPLE KING 12/12/2007 1.2 2.4 J 0.063 UJ 0.063 UJ 0.063 UJ 0.18 UJ

APPLE REP 12/12/2007 1.3 2.5 J 0.063 UJ 0.063 UJ 0.063 UJ 0.063 UJ

GILBERT 12/18/2007 0.69 UJ 1.5 UJ 0.063 UJ 0.33 UJ 0.063 UJ 0.16 UJ

SNOKIST 12/12/2007 0.062 UJ 0.25 J 0.062 UJ 0.062 UJ 0.062 UJ 0.062 UJ

CON AGRA* 12/18/2007 0.07 UJ 0.063 UJ 0.063 U 0.063 U 0.063 U 0.063 U

ZIRKLE FRUIT 12/13/2007 2.6 J 3.1 J 0.062 UJ 0.26 UJ 0.062 UJ 0.062 UJ

TRNSFR BLNK 12/12/2007 0.063 U 0.063 U 0.063 U 0.063 U 0.063 U 0.063 U

ANDRUS - -

APPLE KING 3/13/2008 0.55 J 6.3 J 0.062 UJ 0.062 UJ 0.083 UJ 0.062 UJ

GILBERT 3/18/2008 0.061 U 2.0 0.23 UJ 0.061 U 0.16 UJ 0.12 UJ

SNOKIST 3/20/2008 0.063 U 1.3 0.063 U 0.063 U 0.063 U 0.063 U

SNOKIST REP 3/20/2008 0.063 U 1.3 0.063 U 0.063 U 0.063 U 0.063 U

CON AGRA* 3/19/2008 0.14 J 0.45 UJ 0.063 UJ 0.063 UJ 0.063 UJ 0.063 UJ

ZIRKLE 3/11/2008 1.1 UJ 3.0 J 0.063 UJ 0.063 UJ 0.063 UJ 0.063 UJ

TRNSFR BLNK 3/19/2008 0.063 U 0.17 0.063 U 0.063 U 0.063 U 0.063 U

U = not detected at or above reported value

J = estimated 

REJ = rejected

na = not analyzed

*Twin City sold to Con Agra Foods Oct 07

Dieldrin Chlorpyrfos

CisChlordane CisNonachlorTransChlordaneTransNonachlor
Yakima Pesticides/PCBs TMDL: Vol 1, WQ Study Findings 

Page 303 

Collection

Field ID Date (ng/L) (ng/L) (ng/L) (ng/L) (ng/L)

ANDRUS 7/26/2007 0.062 UJ 3.1 UJ 0.22 J 0.47 UJ 0.073 UJ

APPLE KING 7/26/2007 0.062 UJ 3.1 UJ 0.062 UJ 0.062 UJ 0.073 UJ

GILBERT 7/26/2007 0.063 UJ 3.1 UJ 0.063 UJ 0.063 UJ 0.063 UJ

SNOKIST 7/30/2007 0.061 U 3.1 U 0.11 0.061 U 0.061 U

TWIN CITY 7/26/2007 0.064 UJ 3.8 UJ 0.14 J 0.064 UJ 0.064 UJ

ZIRKLE FRUIT 7/26/2007 0.063 UJ 5.7 UJ 0.063 UJ 0.063 UJ 0.084 UJ

ZIRKLE REP 7/26/2007 0.063 UJ 7.7 UJ 0.063 UJ 0.063 UJ 0.079 UJ

TRNSFR BLNK 7/26/2007 0.065 UJ 3.1 UJ 0.065 UJ 0.065 UJ 0.065 UJ

ANDRUS 10/10/2007 0.064 UJ 16 UJ 0.35 0.064 UJ 0.15 UJ

APPLE KING 9/20/2007 0.061 U 3.1 U 0.061 U 0.061 UJ 0.061 UJ

GILBERT 9/25/2007 0.064 UJ 3.2 UJ 0.064 UJ 0.064 UJ 0.064 UJ

SNOKIST 9/20/2007 0.062 U 3.1 U 0.18 0.13 UJ 0.062 UJ

TWIN CITY 9/27/2007 0.061 U 3.1 U 0.061 0.061 0.061 UJ

TWIN REP 9/27/2007 0.061 U 3.1 U 0.061 U 0.061 U 0.061 U

ZIRKLE FRUIT 9/18/2007 0.063 U 6.3 UJ 0.063 U 0.99 UJ 0.13 UJ

ANDRUS 12/12/2007 0.063 UJ 3.1 UJ 0.063 UJ 0.063 UJ 0.063 UJ

APPLE KING 12/12/2007 0.063 UJ 3.1 U 0.063 UJ 0.086 UJ 0.063 UJ

APPLE REP 12/12/2007 0.063 UJ 3.1 UJ 0.063 UJ 0.063 UJ 0.063 UJ

GILBERT 12/18/2007 0.063 UJ 16 UJ 0.063 UJ 0.074 UJ 0.24 UJ

SNOKIST 12/12/2007 0.062 UJ 3.1 UJ 0.062 UJ 0.062 UJ 0.062 UJ

CON AGRA* 12/18/2007 0.063 U 3.1 U 0.063 U 0.063 U 0.063 UJ

ZIRKLE FRUIT 12/13/2007 0.062 UJ 6.2 UJ 0.17 UJ 0.062 UJ 0.17 UJ

TRNSFR BLNK 12/12/2007 0.063 U 3.2 U 0.063 U 0.063 U 0.063 UJ

ANDRUS - -

APPLE KING 3/13/2008 0.062 UJ 3.1 UJ 0.062 UJ 0.062 UJ 0.07 UJ

GILBERT 3/18/2008 0.31 UJ 30 UJ 0.086 UJ 0.061 U 0.061 UJ

SNOKIST 3/20/2008 0.063 U 7.8 UJ 0.063 U 0.44 UJ 0.063 UJ

SNOKIST REP 3/20/2008 0.063 U 7.8 UJ 0.063 U 0.48 UJ 0.063 UJ

CON AGRA* 3/19/2008 0.063 UJ 3.1 UJ 0.063 UJ 0.063 UJ 0.063 UJ

ZIRKLE 3/11/2008 0.063 UJ 16 UJ 0.14 J 0.12 J 0.11 UJ

TRNSFR BLNK 3/19/2008 0.063 U 3.1 U 0.063 U 0.063 U 0.063 UJ

U = not detected at or above reported value

J = estimated 

REJ = rejected

na = not analyzed

*Twin City sold to Con Agra Foods Oct 07

Oxychlordane Toxaphene

AlphaBHC Beta-BHC Delta-BHC
Yakima Pesticides/PCBs TMDL: Vol 1, WQ Study Findings 

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Collection

Field ID Date (ng/L) (ng/L) (ng/L) (ng/L) (ng/L)

ANDRUS 7/26/2007 0.062 UJ 0.062 UJ 0.42 J 0.63 J 1.0 J

APPLE KING 7/26/2007 0.062 UJ 0.062 UJ 0.8 J 2.2 J 3.7 J

GILBERT 7/26/2007 0.063 UJ 0.063 UJ 0.72 J 2.1 J 1.3 J

SNOKIST 7/30/2007 0.061 U 0.24 UJ 0.12 J 0.082 J 3.0 J

TWIN CITY 7/26/2007 0.064 UJ 0.064 UJ 1.3 J 0.2 J 7.2 J

ZIRKLE FRUIT 7/26/2007 0.063 UJ 0.37 UJ 1.2 UJ 9.6 J 13 J

ZIRKLE REP 7/26/2007 0.063 UJ 0.063 UJ 1.5 J 12 J 18 J

TRNSFR BLNK 7/26/2007 0.065 UJ 0.065 UJ 0.065 UJ 0.065 UJ 0.065 UJ

ANDRUS 10/10/2007 0.55 J 0.32 UJ 0.32 UJ 93 J 34 J

APPLE KING 9/20/2007 0.065 UJ 0.18 UJ 0.58 J 1.6 2.6

GILBERT 9/25/2007 0.064 UJ 0.064 UJ 0.064 UJ 0.064 UJ 14 J

SNOKIST 9/20/2007 0.062 U 0.062 U 0.099 J 0.27 J 2.0

TWIN CITY 9/27/2007 0.077 0.061 UJ 0.65 0.067 1.8 J

TWIN REP 9/27/2007 0.061 U 0.061 UJ 0.61 0.071 J 1.2

ZIRKLE FRUIT 9/18/2007 0.063 U 0.099 UJ 1.2 J 7.8 J 15

ANDRUS 12/12/2007 0.075 J 0.73 UJ 1.7 J 12 J 7.7 J

APPLE KING 12/12/2007 0.063 UJ 0.41 UJ 2.4 11 7.4 J

APPLE REP 12/12/2007 0.063 UJ 1.3 UJ 2.7 14 J 9.2 J

GILBERT 12/18/2007 0.18 UJ 1.9 UJ 3.5 13 J 8.0 J

SNOKIST 12/12/2007 0.062 UJ 0.062 UJ 0.062 UJ 0.16 J 1.1 J

CON AGRA* 12/18/2007 0.14 0.27 UJ 0.98 J 0.39 UJ 12 E

ZIRKLE FRUIT 12/13/2007 0.17 UJ 2.6 UJ 4.4 21 J 17 J

TRNSFR BLNK 12/12/2007 0.063 U 0.063 UJ 0.063 U 0.063 UJ 0.063 UJ

ANDRUS - -

APPLE KING 3/13/2008 0.062 UJ 0.062 UJ 3.4 J 7.6 J 7.7 J

GILBERT 3/18/2008 0.3 UJ 0.88 UJ 5 J 14 J 53

SNOKIST 3/20/2008 0.063 U 0.063 U 0.66 0.46 2.0 J

SNOKIST REP 3/20/2008 0.15 0.063 U 0.52 0.33 1.8 J

CON AGRA* 3/19/2008 0.063 UJ 0.063 UJ 0.083 UJ 0.17 J 6.6 J

ZIRKLE 3/11/2008 0.23 J 0.89 UJ 1.3 J 14 J 11 J

TRNSFR BLNK 3/19/2008 0.063 U 0.063 U 0.063 U 0.063 U 0.078 J

U = not detected at or above reported value

J = estimated 

REJ = rejected

na = not analyzed

*Twin City sold to Con Agra Foods Oct 07

Lindane Aldrin Endosulfan I Endosulfan II

Endosulfan 

Sulfate
Yakima Pesticides/PCBs TMDL: Vol 1, WQ Study Findings 

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Collection

Field ID Date (ng/L) (ng/L) (ng/L) (ng/L) (ng/L) (ng/L)

ANDRUS 7/26/2007 0.062 UJ 0.062 UJ 0.062 UJ 0.062 UJ 1.1 UJ 0.18 UJ

APPLE KING 7/26/2007 0.4 UJ 1.2 UJ 0.24 UJ 0.062 UJ 0.062 UJ 0.062 UJ

GILBERT 7/26/2007 0.1 UJ 0.063 UJ 0.063 UJ 0.063 UJ 0.063 UJ 0.063 UJ

SNOKIST 7/30/2007 0.25 UJ 0.061 U 0.21 UJ 0.061 U 0.061 U 0.061 U

TWIN CITY 7/26/2007 0.064 UJ 0.064 UJ 0.11 UJ 0.064 UJ 0.51 UJ 0.064 UJ

ZIRKLE FRUIT 7/26/2007 0.79 UJ 0.38 UJ 1.0 UJ 0.063 UJ 0.063 UJ 0.084 UJ

ZIRKLE REP 7/26/2007 0.063 UJ 0.063 UJ 0.87 UJ 0.063 UJ 0.93 UJ 0.079 UJ

TRNSFR BLNK 7/26/2007 0.065 UJ 0.065 UJ 0.065 UJ 0.065 UJ 0.065 UJ 0.065 UJ

ANDRUS 10/10/2007 1.7 J 0.32 UJ 2.9 J 11 0.064 UJ 0.17 UJ

APPLE KING 9/20/2007 0.11 UJ 0.061 UJ 0.061 U 0.47 J 0.061 U 0.16 UJ

GILBERT 9/25/2007 0.064 UJ 0.064 UJ 0.36 J 0.47 UJ 0.064 UJ 0.88 J

SNOKIST 9/20/2007 0.062 U 0.44 UJ 0.062 U 0.8 J 0.062 U 0.062 U

TWIN CITY 9/27/2007 0.061 U 0.061 UJ 0.48 J 0.061 UJ 0.12 J 0.061 U

TWIN REP 9/27/2007 0.061 U 0.8 J 0.061 U 0.061 U 0.13 0.061 U

ZIRKLE FRUIT 9/18/2007 0.8 UJ 0.063 UJ 0.063 U 0.12 UJ 0.29 UJ 0.063 U

ANDRUS 12/12/2007 0.063 UJ 0.063 UJ 0.063 UJ 0.18 UJ 0.39 UJ 0.063 UJ

APPLE KING 12/12/2007 0.46 UJ 0.82 UJ 0.063 UJ 0.063 UJ 0.33 UJ 0.063 UJ

APPLE REP 12/12/2007 0.53 UJ 1.5 UJ 0.063 U 0.066 UJ 0.063 U 0.063 UJ

GILBERT 12/18/2007 0.81 UJ 0.063 UJ 0.063 U 0.29 UJ 3.2 0.063 UJ

SNOKIST 12/12/2007 0.062 UJ 0.062 UJ 0.062 UJ 0.062 UJ 0.062 UJ 0.062 UJ

CON AGRA* 12/18/2007 0.063 UJ 0.14 UJ 0.063 UJ 0.063 U 0.13 UJ 0.063 U

ZIRKLE FRUIT 12/13/2007 0.43 UJ 1.3 UJ 0.062 U 0.32 UJ 0.062 U 0.079 UJ

TRNSFR BLNK 12/12/2007 0.063 UJ 0.063 UJ 0.063 U 0.063 U 0.063 U 0.063 U

ANDRUS - -

APPLE KING 3/13/2008 0.28 UJ REJ 0.21 UJ 0.062 UJ 0.19 UJ 0.062 UJ

GILBERT 3/18/2008 0.061 U REJ 1.2 UJ 0.14 UJ 0.47 0.072 UJ

SNOKIST 3/20/2008 0.063 U REJ 0.063 U 0.063 U 0.063 U 0.082 J

SNOKIST REP 3/20/2008 0.063 U REJ 0.063 U 0.063 U 0.063 U 0.11 J

CON AGRA* 3/19/2008 0.063 UJ REJ 0.063 UJ 0.063 UJ 0.12 J 0.063 UJ

ZIRKLE 3/11/2008 0.13 UJ REJ 0.063 UJ 0.063 UJ 0.063 UJ 0.063 UJ

TRNSFR BLNK 3/19/2008 0.063 U REJ 0.063 U 0.063 U 0.063 U 0.063 U

U = not detected at or above reported value

J = estimated 

REJ = rejected

na = not analyzed

*Twin City sold to Con Agra Foods Oct 07

Endrin

Endrin 

Aldehyde

Endrin 

Ketone Heptachlor

Heptachlor 

Epoxide

Hexachlorobenzene
Yakima Pesticides/PCBs TMDL: Vol 1, WQ Study Findings 

Page 306 

Collection

Field ID Date (ng/L) (mg/L) (NTU) (umhos/cm)

ANDRUS 7/26/2007 0.062 UJ 86 110 679

APPLE KING 7/26/2007 2.0 UJ 4 18 456

GILBERT 7/26/2007 0.095 UJ 2 0.7 185

SNOKIST 7/30/2007 1.4 UJ 24 6.3 996

TWIN CITY 7/26/2007 2.3 UJ 15 5.3 3,010

ZIRKLE FRUIT 7/26/2007 1.0 UJ 2 5.4 569

ZIRKLE REP 7/26/2007 0.063 UJ 2 U 5.3 568

TRNSFR BLNK 7/26/2007 0.065 UJ na na na

ANDRUS 10/10/2007 35 J 242 110 603

APPLE KING 9/20/2007 0.061 UJ 7 9.6 432

GILBERT 9/25/2007 0.064 UJ 51 28 250

SNOKIST 9/20/2007 0.062 UJ 4 1.9 529

TWIN CITY 9/27/2007 0.061 U 2 1.9 2,110

TWIN REP 9/27/2007 0.061 U 2 2.1 2,100

ZIRKLE FRUIT 9/18/2007 0.063 UJ 2 U 3.5 718

ANDRUS 12/12/2007 2.7 UJ 20 28 494

APPLE KING 12/12/2007 0.84 UJ 3 17 479

APPLE REP 12/12/2007 0.87 UJ 4 12 480

GILBERT 12/18/2007 2.3 UJ 68 34 221

SNOKIST 12/12/2007 0.062 UJ 11 4.1 592

CON AGRA* 12/18/2007 0.063 UJ 5 3.5 2,310

ZIRKLE FRUIT 12/13/2007 2.3 UJ 16 18 748

TRNSFR BLNK 12/12/2007 0.063 UJ na na na

ANDRUS - -

APPLE KING 3/13/2008 0.062 UJ 6 16 518

GILBERT 3/18/2008 1.1 UJ 24 24 J 225

SNOKIST 3/20/2008 0.063 U 3 1.3 545

SNOKIST REP 3/20/2008 0.063 U 3 1.1 543

CON AGRA* 3/19/2008 0.063 UJ 8 4.3 2,990

ZIRKLE 3/11/2008 0.063 UJ 19 23 766

TRNSFR BLNK 3/19/2008 0.063 UJ na na na

U = not detected at or above reported value

J = estimated 

REJ = rejected

na = not analyzed

*Twin City sold to Con Agra Foods Oct 07

Methoxychlor

Total 

Suspended 

Solids Turbidity Conductivity
Yakima Pesticides/PCBs TMDL: Vol 1, WQ Study Findings 

Page 307 

Appendix P. Stormwater Data, 2007-08 

U = not detected at or above reported value 

J = estimated

na = not analyzed

 

Sample No. City Field ID

Collection 

Date

7404850 Ellensburg CANYON RD 10/4/2007 na na na

7404851 Ellensburg MT VIEW 10/4/2007 na na na

7404852 Ellensburg CORA 10/4/2007 na na na

7424858 Yakima HORSE 10/18/2007 2.5 UJ 9.1 J 7.5 J

7424863 Yakima HORSE REP 10/18/2007 0.29 J 5.8 J 4.7 J

7474858 Yakima HORSE 11/17/2007 2.5 J 14 J 9.6 J

7474861 Yakima HORSE REP 11/17/2007 3 J 19 J 13 J

7474859 Yakima 12TH 11/17/2007 3.3 J 18 J 22 J

7474860 Yakima PERRY T 11/17/2007 2.5 UJ 18 J 13 J

7474862 Yakima TRAILER 11/17/2007 2.5 UJ 2.5 UJ 2.5 UJ

7474863 Yakima 34TH 11/17/2007 2.5 UJ 3 J 2.5 UJ

7474864 Yakima TRANSF BLNK 11/17/2007 na na na

7474850 Ellensburg CANYON RD 11/17/2007 na na na

7474851 Ellensburg MT VIEW 11/17/2007 na na na

7474852 Ellensburg CORA 11/17/2007 na na na

7474853 Ellensburg MUSIC 11/17/2007 na na na

na na na

7494859 Yakima 12TH 12/2/2007 2.7 UJ 13 J 13 J

7494861 Yakima 12TH REP 12/2/2007 2.6 UJ 13 J 13 J

7494858 Yakima HORSE 12/2/2007 2.5 UJ 9.8 J 9.9 J

7494860 Yakima PERRY T 12/2/2007 2.5 UJ 11 J 9.5 J

7494864 Yakima TRANSF BLNK 12/2/2007 2.5 U 2.5 U 2.5 U

7494850 Ellensburg CANYON RD 12/3/2007 na na na

7494851 Ellensburg MT VIEW 12/3/2007 na na na

7494852 Ellensburg CORA 12/3/2007 na na na

7494853 Ellensburg MUSIC 12/3/2007 na na na

7494854 Ellensburg CORA REP 12/3/2007 na na na

7494865 Ellensburg TRANSF BLNK 12/3/2007 na na na

4,4'-DDD 

(ng/L)

4,4'-DDE 

(ng/L)

4,4'-DDT 

(ng/L)
Yakima Pesticides/PCBs TMDL: Vol 1, WQ Study Findings 

Page 308 

U = not detected at or above reported value 

J = estimated

na = not analyzed

Collection

Sample No. City Field ID Date (ng/L) (ng/L) (ng/L) (ng/L) (ng/L)

7404850 Ellensburg CANYON RD 10/4/2007 na na na na na

7404851 Ellensburg MT VIEW 10/4/2007 na na na na na

7404852 Ellensburg CORA 10/4/2007 na na na na na

7424858 Yakima/Union HORSE 10/18/2007 8.3 17 J 4.9 15 26

7424863 Yakima/Union HORSE REP 10/18/2007 4.6 9.6 J 5.8 8.7 16

7474858 Yakima/Union HORSE 11/17/2007 7.4 UJ 19 J 2.8 J 19 J 21 J

7474861 Yakima/Union HORSE REP 11/17/2007 9.3 UJ 4.8 J 12 24 26

7474859 Yakima/Union 12TH 11/17/2007 4.4 J 2.4 UJ 2.4 U 12 J 14 J

7474860 Yakima/Union PERRY T 11/17/2007 5.1 J 2.5 UJ 2.5 UJ 10 J 12 J

7474862 Yakima/Union TRAILER 11/17/2007 2.5 UJ 2.5 UJ 2.5 UJ 2.5 UJ 2.5 UJ

7474863 Yakima/Union 34TH 11/17/2007 2.5 UJ 2.5 UJ 2.5 UJ 4.5 J 7.0 J

7474864 Yakima/Union TRNSF BLNK 11/17/2007 na na na na na

7474850 Ellensburg CANYON RD 11/17/2007 na na na na na

7474851 Ellensburg MT VIEW 11/17/2007 na na na na na

7474852 Ellensburg CORA 11/17/2007 na na na na na

7474853 Ellensburg MUSIC 11/17/2007 na na na na na

7494859 Yakima/Union 12TH 12/2/2007 2.7 UJ 3.8 J 5.4 J 15 J 13 J

7494861 Yakima/Union 12TH REP 12/2/2007 2.9 J 4.3 J 5.2 J 13 J 11 J

7494858 Yakima/Union HORSE 12/2/2007 2.5 U 3.3 4.9 13 J 9.9 J

7494860 Yakima/Union PERRY T 12/2/2007 3.0 J 4.5 J 3.0 13 J 10 J

7494864 Yakima/Union TRNSF BLNK 12/2/2007 2.5 U 2.5 U 2.5 U 2.5 UJ 2.5 UJ

7494850 Ellensburg CANYON RD 12/3/2007 na na na na na

7494851 Ellensburg MT VIEW 12/3/2007 na na na na na

7494852 Ellensburg CORA 12/3/2007 na na na na na

7494853 Ellensburg MUSIC 12/3/2007 na na na na na

7494854 Ellensburg CORA REP 12/3/2007 na na na na na

7494865 Ellensburg TRNSF BLNK 12/3/2007 na na na na na

Endosulfan 

Sulfate

Endosulfan 

I

Endosulfan 

II

ChlorDieldrin pyrifos
Yakima Pesticides/PCBs TMDL: Vol 1, WQ Study Findings 

Page 309 

TaTi

Collection

City Field ID Date (ng/L) (ng/L) (ng/L) (ng/L)

Ellensburg CANYON RD 10/4/2007 na na na na

Ellensburg MT VIEW 10/4/2007 na na na na

Ellensburg CORA 10/4/2007 na na na na

Yakima/Union HORSE 10/18/2007 2.5 UJ 2.5 UJ 2.5 UJ 2.5 UJ

Yakima/Union HORSE REP 10/18/2007 2.5 UJ 2.5 UJ 2.5 UJ 2.5 UJ

Yakima/Union HORSE 11/17/2007 2.4 UJ 2.4 UJ 2.4 UJ 2.4 UJ

Yakima/Union HORSE REP 11/17/2007 2.5 UJ 2.5 UJ 2.5 UJ 2.5 UJ

Yakima/Union 12TH 11/17/2007 4.0 J 2.4 UJ 4.1 J 4.5 J

Yakima/Union PERRY T 11/17/2007 2.5 UJ 2.5 UJ 2.5 UJ 2.5 UJ

Yakima/Union TRAILER 11/17/2007 2.5 UJ 2.5 UJ 2.5 UJ 2.5 UJ

Yakima/Union 34TH 11/17/2007 2.5 UJ 2.5 UJ 2.5 UJ 2.5 UJ

Yakima/Union TRNSF BLNK 11/17/2007 na na na na

Ellensburg CANYON RD 11/17/2007 na na na na

Ellensburg MT VIEW 11/17/2007 na na na na

Ellensburg CORA 11/17/2007 na na na na

Ellensburg MUSIC 11/17/2007 na na na na

Yakima/Union 12TH 12/2/2007 2.7 UJ 2.7 UJ 2.7 UJ 2.7 UJ

Yakima/Union 12TH REP 12/2/2007 2.6 UJ 2.6 UJ 2.6 UJ 2.6 UJ

Yakima/Union HORSE 12/2/2007 2.5 UJ 2.5 UJ 2.5 UJ 2.5 UJ

Yakima/Union PERRY T 12/2/2007 2.5 UJ 2.5 UJ 2.5 UJ 2.5 UJ

Yakima/Union TRNSF BLNK 12/2/2007 2.5 U 2.5 U 2.5 U 2.5 U

Ellensburg CANYON RD 12/3/2007 na na na na

Ellensburg MT VIEW 12/3/2007 na na na na

Ellensburg CORA 12/3/2007 na na na na

Ellensburg MUSIC 12/3/2007 na na na na

Ellensburg CORA REP 12/3/2007 na na na na

Ellensburg TRNSF BLNK 12/3/2007 na na na na

U = not detected at or above reported value

J = estimated 

na = not analyzed

Cis-Chlordane 

CisNonachlorTransChlordane TransNonachlor
Yakima Pesticides/PCBs TMDL: Vol 1, WQ Study Findings 

Page 310 

Collection

City Field ID Date (ng/L) (ng/L) (ng/L) (ng/L)

Ellensburg CANYON RD 10/4/2007 na na na na

Ellensburg MT VIEW 10/4/2007 na na na na

Ellensburg CORA 10/4/2007 na na na na

Yakima/Union HORSE 10/18/2007 2.5 UJ 2.5 UJ 2.5 UJ 2.5 UJ

Yakima/Union HORSE REP 10/18/2007 2.5 UJ 2.5 UJ 2.5 UJ 2.5 UJ

Yakima/Union HORSE 11/17/2007 2.4 UJ 2.4 UJ 2.4 UJ 2.4 UJ

Yakima/Union HORSE REP 11/17/2007 2.5 UJ 2.5 UJ 2.5 UJ 2.5 UJ

Yakima/Union 12TH 11/17/2007 2.4 UJ 2.4 UJ 2.4 UJ 2.4 UJ

Yakima/Union PERRY T 11/17/2007 2.5 UJ 2.5 UJ 2.5 UJ 2.5 UJ

Yakima/Union TRAILER 11/17/2007 2.5 UJ 2.5 UJ 2.5 UJ 2.5 UJ

Yakima/Union 34TH 11/17/2007 2.5 UJ 2.5 UJ 2.5 UJ 2.5 UJ

Yakima/Union TRNSF BLNK 11/17/2007 na na na na

Ellensburg CANYON RD 11/17/2007 na na na na

Ellensburg MT VIEW 11/17/2007 na na na na

Ellensburg CORA 11/17/2007 na na na na

Ellensburg MUSIC 11/17/2007 na na na na

Yakima/Union 12TH 12/2/2007 2.7 UJ 2.7 UJ 2.7 UJ 2.7 UJ

Yakima/Union 12TH REP 12/2/2007 2.6 UJ 2.6 UJ 2.6 UJ 2.6 UJ

Yakima/Union HORSE 12/2/2007 2.5 UJ 2.5 UJ 2.5 UJ 2.5 UJ

Yakima/Union PERRY T 12/2/2007 2.5 UJ 2.5 UJ 2.5 UJ 2.5 UJ

Yakima/Union TRNSF BLNK 12/2/2007 2.5 U 2.5 U 2.5 U 2.5 U

Ellensburg CANYON RD 12/3/2007 na na na na

Ellensburg MT VIEW 12/3/2007 na na na na

Ellensburg CORA 12/3/2007 na na na na

Ellensburg MUSIC 12/3/2007 na na na na

Ellensburg CORA REP 12/3/2007 na na na na

Ellensburg TRNSF BLNK 12/3/2007 na na na na

U = not detected at or above reported value

J = estimated 

na = not analyzed

OxychlordaneAlphaBHC Beta-BHC Delta-BHC
Yakima Pesticides/PCBs TMDL: Vol 1, WQ Study Findings 

Page 311 

Collection

City Field ID Date (ng/L) (ng/L) (pg/L) (ng/L) (ng/L)

Ellensburg CANYON RD 10/4/2007 na na 2,144 J na na

Ellensburg MT VIEW 10/4/2007 na na 530 J na na

Ellensburg CORA 10/4/2007 na na 352 J na na

Yakima/Union HORSE 10/18/2007 2.5 UJ 25 UJ 15,999 J 2.5 U 4.4 UJ

Yakima/Union HORSE REP 10/18/2007 2.5 UJ 25 UJ 1,668 J 2.5 U 2.5 U

Yakima/Union HORSE 11/17/2007 2.4 UJ 24 UJ 24,467 J 4.0 J 2.9 UJ

Yakima/Union HORSE REP 11/17/2007 2.5 UJ 25 UJ 32,372 J 3.3 J 4.9 UJ

Yakima/Union 12TH 11/17/2007 2.4 UJ 24 UJ na 2.6 UJ 2.5 UJ

Yakima/Union PERRY T 11/17/2007 2.5 UJ 25 UJ 15,490 J 2.5 UJ 2.5 UJ

Yakima/Union TRAILER 11/17/2007 2.5 UJ 25 UJ 566 J 2.5 UJ 2.5 UJ

Yakima/Union 34TH 11/17/2007 2.5 UJ 25 UJ 734 J 2.5 UJ 2.5 UJ

Yakima/Union TRNSF BLNK 11/17/2007 na na 133 J na na

Ellensburg CANYON RD 11/17/2007 na na 7,046 J na na

Ellensburg MT VIEW 11/17/2007 na na 33,485 J na na

Ellensburg CORA 11/17/2007 na na broken na na

Ellensburg MUSIC 11/17/2007 na na 440 J na na

Yakima/Union 12TH 12/2/2007 2.7 UJ 27 UJ 11,135 J 2.7 UJ 2.7 UJ

Yakima/Union 12TH REP 12/2/2007 2.6 UJ 26 UJ 10,989 J 2.6 UJ 2.6 UJ

Yakima/Union HORSE 12/2/2007 2.5 UJ 25 UJ 2,159 J 2.5 U 2.5 UJ

Yakima/Union PERRY T 12/2/2007 2.5 UJ 25 UJ 1,994 J 2.5 U 2.5 UJ

Yakima/Union TRNSF BLNK 12/2/2007 2.5 U 25 U 363 J 2.5 U 2.5 UJ

Ellensburg CANYON RD 12/3/2007 na na 6,136 J na na

Ellensburg MT VIEW 12/3/2007 na na 1,009 J na na

Ellensburg CORA 12/3/2007 na na 1,104 J na na

Ellensburg MUSIC 12/3/2007 na na 2,000 J na na

Ellensburg CORA REP 12/3/2007 na na 19,815 J na na

Ellensburg TRNSF BLNK 12/3/2007 na na 463 J na na

U = not detected at or above reported value

J = estimated 

na = not analyzed

Lindane Toxaphene

Total 

PCBs Aldrin Endrin
Yakima Pesticides/PCBs TMDL: Vol 1, WQ Study Findings 

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Collection

City Field ID Date (ng/L) (ng/L) (ng/L) (ng/L)

Ellensburg CANYON RD 10/4/2007 na na na na

Ellensburg MT VIEW 10/4/2007 na na na na

Ellensburg CORA 10/4/2007 na na na na

Yakima/Union HORSE 10/18/2007 11 UJ 3.4 UJ 2.5 UJ 3.4 J

Yakima/Union HORSE REP 10/18/2007 10 UJ 2.5 U 2.5 UJ 2.5 U

Yakima/Union HORSE 11/17/2007 7.8 UJ 2.0 U 2.4 UJ 2.8 J

Yakima/Union HORSE REP 11/17/2007 5.3 UJ 2.6 UJ 2.5 UJ 3.5 J

Yakima/Union 12TH 11/17/2007 2.7 UJ 2.5 UJ 2.4 UJ 2.5 J

Yakima/Union PERRY T 11/17/2007 4.0 UJ 2.5 UJ 2.5 UJ 2.7 J

Yakima/Union TRAILER 11/17/2007 2.5 UJ 2.5 UJ 2.5 UJ 2.5 UJ

Yakima/Union 34TH 11/17/2007 2.5 UJ 2.5 UJ 2.5 UJ 2.5 UJ

Yakima/Union TRNSF BLNK 11/17/2007 na na na na

Ellensburg CANYON RD 11/17/2007 na na na na

Ellensburg MT VIEW 11/17/2007 na na na na

Ellensburg CORA 11/17/2007 na na na na

Ellensburg MUSIC 11/17/2007 na na na na

Yakima/Union 12TH 12/2/2007 2.7 UJ 2.7 UJ 2.7 UJ 2.7 UJ

Yakima/Union 12TH REP 12/2/2007 2.6 UJ 2.6 UJ 2.6 UJ 2.6 UJ

Yakima/Union HORSE 12/2/2007 2.5 UJ 2.5 U 2.5 UJ 2.5 U

Yakima/Union PERRY T 12/2/2007 2.5 UJ 2.5 U 2.5 UJ 2.5 U

Yakima/Union TRNSF BLNK 12/2/2007 2.5 UJ 2.5 U 2.5 U 2.5 U

Ellensburg CANYON RD 12/3/2007 na na na na

Ellensburg MT VIEW 12/3/2007 na na na na

Ellensburg CORA 12/3/2007 na na na na

Ellensburg MUSIC 12/3/2007 na na na na

Ellensburg CORA REP 12/3/2007 na na na na

Ellensburg TRNSF BLNK 12/3/2007 na na na na

U = not detected at or above reported value

J = estimated 

na = not analyzed

Endrin 

Aldehyde

Endrin 

Ketone Heptachlor

Heptachlor 

Epoxide
Yakima Pesticides/PCBs TMDL: Vol 1, WQ Study Findings 

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Collection

City Field ID Date (ng/L) (ng/L) (mg/L) (NTU) (umhos/cm)

Ellensburg CANYON RD 10/4/2007 na na 127 210 J 192

Ellensburg MT VIEW 10/4/2007 na na 20 39 J 118

Ellensburg CORA 10/4/2007 na na 28 29 J 245

Yakima/Union HORSE 10/18/2007 2.5 UJ 11 43 75 91

Yakima/Union HORSE REP 10/18/2007 2.5 UJ 6.3 38 75 91

Yakima/Union HORSE 11/17/2007 2.4 UJ 16 641 370 J 148

Yakima/Union HORSE REP 11/17/2007 2.5 UJ 14 512 330 J 219

Yakima/Union 12TH 11/17/2007 2.4 UJ 3.3 654 400 J 98

Yakima/Union PERRY T 11/17/2007 2.5 UJ 5.1U 323 280 J 165

Yakima/Union TRAILER 11/17/2007 2.5 UJ 2.5 1 U 1.4 J 286

Yakima/Union 34TH 11/17/2007 2.5 UJ 2.5 18 33 J 146

Yakima/Union TRNSF BLNK 11/17/2007 na na na na na

Ellensburg CANYON RD 11/17/2007 na na 206 200 J 51

Ellensburg MT VIEW 11/17/2007 na na 116 140 J 42

Ellensburg CORA 11/17/2007 na na 74 98 J 175

Ellensburg MUSIC 11/17/2007 na na 15 45 J 261

Yakima/Union 12TH 12/2/2007 2.7 UJ 23 326 400 J 1,990

Yakima/Union 12TH REP 12/2/2007 2.6 UJ 22 244 450 J 2,020

Yakima/Union HORSE 12/2/2007 2.5 UJ 19 111 180 J 661

Yakima/Union PERRY T 12/2/2007 2.5 UJ 3.3U 98 230 J 4,710

Yakima/Union TRNSF BLNK 12/2/2007 2.5 U 2.5 na na na

Ellensburg CANYON RD 12/3/2007 na na 134 280 344

Ellensburg MT VIEW 12/3/2007 na na 52 140 354

Ellensburg CORA 12/3/2007 na na 66 120 342

Ellensburg MUSIC 12/3/2007 na na 47 110 282

Ellensburg CORA REP 12/3/2007 na na 63 120 347

Ellensburg TRNSF BLNK 12/3/2007 na na na na na

U = not detected at or above reported value

J = estimated 

na = not analyzed

HexachlorobenzeneMethoxychlor

Total 

Suspended 

Solids Turbidity Conductivity
Yakima Pesticides/PCBs TMDL: Vol 1, WQ Study Findings 

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Collection

Sample No. City Field ID Date (ng/L) (ng/L) (ng/L)

8114859 Yakima/Union 12TH 3/13/2008 33 J 54 J 3.5 J

8114858 Yakima/Union HORSE 3/13/2008 30 J 52 J 4.1 J

8114861 Yakima/Union HORSE REP 3/13/2008 30 J 52 J 4.1 J

8114864 Yakima/Union TRNSF BLNK 3/13/2008 2.6 U 2.6 U 2.6 U

8114862 Yakima/Union BOTTLE BLNK 3/13/2008 na na na

8134858 Yakima/Union HORSE 3/28/2008 na na na

8134859 Yakima/Union 12TH 3/28/2008 na na na

8134861 Yakima/Union HORSE REP 3/28/2008 na na na

8134864 Yakima/Union TRNSF BLNK 3/28/2008 na na na

8134865 Yakima/Union BOTTLE BLNK 3/28/2008 na na na

8234850 Ellensburg CANYON RD 6/3/2008 na na na

8234852 Ellensburg CORA 6/3/2008 na na na

8234860 Yakima/Union PERRY T 6/3/2008 9.1 14 2.5 U

8234864 Yakima/Union BOTTLE BLNK 6/3/2008 2.5 U 2.5 U 2.5 U

U = not detected at or above reported value

J = estimated 

na = not analyzed

4,4'-DDT 4,4'-DDE 4,4'-DDD
Yakima Pesticides/PCBs TMDL: Vol 1, WQ Study Findings 

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Collection

City Field ID Date (ng/L) (ng/L) (ng/L) (ng/L) (ng/L)

Yakima/Union 12TH 3/13/2008 2.6 UJ 222 J 40 J 47 J 14 J

Yakima/Union HORSE 3/13/2008 3.1 UJ 159 J 47 J 42 J 5.6 J

Yakima/Union HORSE REP 3/13/2008 3.1 UJ 156 J 40 J 41 J 6.8 J

Yakima/Union TRNSF BLNK 3/13/2008 2.6 UJ 2.6 UJ 2.6 UJ 2.6 UJ 2.6 UJ

Yakima/Union BOTTLE BLNK 3/13/2008 na na na na na

Yakima/Union HORSE 3/28/2008 na na na na na

Yakima/Union 12TH 3/28/2008 na na na na na

Yakima/Union HORSE REP 3/28/2008 na na na na na

Yakima/Union TRNSF BLNK 3/28/2008 na na na na na

Yakima/Union BOTTLE BLNK 3/28/2008 na na na na na

Ellensburg CANYON RD 6/3/2008 na na na na na

Ellensburg CORA 6/3/2008 na na na na na

Yakima/Union PERRY T 6/3/2008 2.5 UJ 6.0 J 84 J 23 J 17 J

Yakima/Union BOTTLE BLNK 6/3/2008 2.5 UJ 2.5 UJ 2.5 UJ 2.5 UJ 2.5 UJ

U = not detected at or above reported value

J = estimated 

na = not analyzed

Dieldrin

ChlorpyrifosEndosulfan 

I

Endosulfan 

II

Endosulfan 

Sulfate
Yakima Pesticides/PCBs TMDL: Vol 1, WQ Study Findings 

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Collection

City Field ID Date (ng/L) (ng/L) (ng/L) (ng/L)

Yakima/Union 12TH 3/13/2008 2.6 UJ 2.6 UJ 2.7 J 2.6 UJ

Yakima/Union HORSE 3/13/2008 2.6 UJ 2.6 UJ 2.9 J 2.6 UJ

Yakima/Union HORSE REP 3/13/2008 2.6 UJ 2.6 UJ 3.1 J 2.6 UJ

Yakima/Union TRNSF BLNK 3/13/2008 2.6 U 2.6 U 2.6 U 2.6 U

Yakima/Union BOTTLE BLNK 3/13/2008 na na na na

Yakima/Union HORSE 3/28/2008 na na na na

Yakima/Union 12TH 3/28/2008 na na na na

Yakima/Union HORSE REP 3/28/2008 na na na na

Yakima/Union TRNSF BLNK 3/28/2008 na na na na

Yakima/Union BOTTLE BLNK 3/28/2008 na na na na

Ellensburg CANYON RD 6/3/2008 na na na na

Ellensburg CORA 6/3/2008 na na na na

Yakima/Union PERRY T 6/3/2008 2.5 U 2.5 U 2.5 U 2.5 U

Yakima/Union BOTTLE BLNK 6/3/2008 2.5 U 2.5 U 2.5 U 2.5 U

U = not detected at or above reported value

J = estimated 

na = not analyzed

Cis-Chlordane 

CisNonachlorTransChlordane TransNonachlor
Yakima Pesticides/PCBs TMDL: Vol 1, WQ Study Findings 

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Collection

City Field ID Date (ng/L) (ng/L) (ng/L) (ng/L)

Yakima/Union 12TH 3/13/2008 2.6 UJ 2.6 UJ 2.6 UJ 2.6 UJ

Yakima/Union HORSE 3/13/2008 2.6 UJ 2.6 UJ 2.6 UJ 2.6 UJ

Yakima/Union HORSE REP 3/13/2008 2.6 UJ 2.6 UJ 2.6 UJ 2.6 UJ

Yakima/Union TRNSF BLNK 3/13/2008 2.6 U 2.6 U 2.6 U 2.6 UJ

Yakima/Union BOTTLE BLNK 3/13/2008 na na na na

Yakima/Union HORSE 3/28/2008 na na na na

Yakima/Union 12TH 3/28/2008 na na na na

Yakima/Union HORSE REP 3/28/2008 na na na na

Yakima/Union TRNSF BLNK 3/28/2008 na na na na

Yakima/Union BOTTLE BLNK 3/28/2008 na na na na

Ellensburg CANYON RD 6/3/2008 na na na na

Ellensburg CORA 6/3/2008 na na na na

Yakima/Union PERRY T 6/3/2008 2.5 U 2.5 U 2.5 U 2.5 U

Yakima/Union BOTTLE BLNK 6/3/2008 2.5 U 2.5 U 2.5 U 2.5 U

U = not detected at or above reported value

J = estimated 

na = not analyzed

OxychlordaneAlphaBHC Beta-BHC Delta-BHC
Yakima Pesticides/PCBs TMDL: Vol 1, WQ Study Findings 

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Collection

City Field ID Date (ng/L) (ng/L) (pg/L) (ng/L) (ng/L)

Yakima/Union 12TH 3/13/2008 2.6 UJ 26 UJ 11,207 J 2.6 UJ 2.6 UJ

Yakima/Union HORSE 3/13/2008 2.6 UJ 32 J 19,584 J 2.6 UJ 2.6 UJ

Yakima/Union HORSE REP 3/13/2008 2.6 UJ 29 J 16,245 J 6.2 UJ 2.6 UJ

Yakima/Union TRNSF BLNK 3/13/2008 2.6 U 26 U 57 J 2.6 UJ 2.6 UJ

Yakima/Union BOTTLE BLNK 3/13/2008 na na 506 J na na

Yakima/Union HORSE 3/28/2008 na na 8,097 J na na

Yakima/Union 12TH 3/28/2008 na na 7,512 J na na

Yakima/Union HORSE REP 3/28/2008 na na 8,502 J na na

Yakima/Union TRNSF BLNK 3/28/2008 na na 292 J na na

Yakima/Union BOTTLE BLNK 3/28/2008 na na 283 J na na

Ellensburg CANYON RD 6/3/2008 na na na na na

Ellensburg CORA 6/3/2008 na na na na na

Yakima/Union PERRY T 6/3/2008 2.5 U 25 UJ na 2.5 UJ 2.5 UJ

Yakima/Union BOTTLE BLNK 6/3/2008 2.5 U 25 UJ na 2.5 UJ 2.5 UJ

U = not detected at or above reported value

J = estimated 

na = not analyzed

Lindane Toxaphene

Total 

PCBs Aldrin Endrin
Yakima Pesticides/PCBs TMDL: Vol 1, WQ Study Findings 

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Collection

City Field ID Date (ng/L) (ng/L) (ng/L) (ng/L)

Yakima/Union 12TH 3/13/2008 2.6 UJ 3.2 UJ 2.6 UJ 2.6 UJ

Yakima/Union HORSE 3/13/2008 2.6 UJ 2.6 UJ 2.6 UJ 12 J

Yakima/Union HORSE REP 3/13/2008 2.6 UJ 2.6 UJ 2.6 UJ 8.7 J

Yakima/Union TRNSF BLNK 3/13/2008 2.6 UJ 2.6 UJ 2.6 U 2.6 UJ

Yakima/Union BOTTLE BLNK 3/13/2008 na na na na

Yakima/Union HORSE 3/28/2008 na na na na

Yakima/Union 12TH 3/28/2008 na na na na

Yakima/Union HORSE REP 3/28/2008 na na na na

Yakima/Union TRNSF BLNK 3/28/2008 na na na na

Yakima/Union BOTTLE BLNK 3/28/2008 na na na

Ellensburg CANYON RD 6/3/2008 na na na na

Ellensburg CORA 6/3/2008 na na na na

Yakima/Union PERRY T 6/3/2008 2.5 UJ 2.5 UJ 2.5 U 2.5 UJ

Yakima/Union BOTTLE BLNK 6/3/2008 2.5 UJ 2.5 UJ 2.5 U 2.5 UJ

U = not detected at or above reported value

J = estimated 

na = not analyzed

Endrin 

Aldehyde

Endrin 

Ketone Heptachlor

Heptachlor 

Epoxide
Yakima Pesticides/PCBs TMDL: Vol 1, WQ Study Findings 

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Collection

City Field ID Date (ng/L) (ng/L) (mg/L) (NTU) (umhos/cm)

Yakima/Union 12TH 3/13/2008 2.6 UJ 2.6 290 330 236

Yakima/Union HORSE 3/13/2008 17 J 19 450 450 478

Yakima/Union HORSE REP 3/13/2008 18 J 7.8 410 500 473

Yakima/Union TRNSF BLNK 3/13/2008 2.6 UJ 2.6 na na na

Yakima/Union BOTTLE BLNK 3/13/2008 na na

Yakima/Union HORSE 3/28/2008 na na 196 225 J 370

Yakima/Union 12TH 3/28/2008 na na 46 60 J 178

Yakima/Union HORSE REP 3/28/2008 na na na na na

Yakima/Union TRNSF BLNK 3/28/2008 na na na na na

Yakima/Union BOTTLE BLNK 3/28/2008 na na na na na

na

Ellensburg CANYON RD 6/3/2008 na na 155 235 232

Ellensburg CORA 6/3/2008 na na 63 70 182

Yakima/Union PERRY T 6/3/2008 2.5 U 2.5 85 92 93

Yakima/Union BOTTLE BLNK 6/3/2008 2.5 U 2.5 na na na

U = not detected at or above reported value

J = estimated 

na = not analyzed

HexachlorobenzeneMethoxychlor

Total 

Suspended 

Solids Turbidity Conductivity
Yakima Pesticides/PCBs TMDL: Vol 1, WQ Study Findings 

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Appendix Q. Values of Potential Use for Calculating 

Stormwater Loads to the Yakima River from Sunnyside and 

Richland (using the Simple Method) 

 

Sunnyside 

City Limits (acres) 4,232 

Annual Rainfall (in.) 7.0 

Fraction of Runoff 0.90 

Impervious Fraction 0.22 

Runoff Coefficient 0.25 

Annual Runoff (in.) 1.79 

Richland 

Area discharging to Yakima River (acres) 5,990 

Annual Rainfall (in.) 7.0 

Fraction of Runoff 0.90 

Impervious Fraction 0.22 

Runoff Coefficient 0.25 

Annual Runoff (in.) 1.79 

 
Yakima Pesticides/PCBs TMDL: Vol 1, WQ Study Findings 

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This page is purposely left blank 

 
Yakima Pesticides/PCBs TMDL: Vol 1, WQ Study Findings 

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Appendix R. Glossary, Acronyms, and Abbreviations 

Glossary 

303(d) list: Section 303(d) of the federal Clean Water Act requires Washington State 

periodically to prepare a list of all surface waters in the state for which beneficial uses of the 

water – such as for drinking, recreation, aquatic habitat, and industrial use – are impaired by 

pollutants. These are water quality limited estuaries, lakes, and streams that fall short of state 

surface water quality standards, and are not expected to improve within the next two years. 

Best Management Practices (BMPs): Physical, structural, and/or operational practices that, 

when used singularly or in combination, prevent or reduce pollutant discharges. 

Bioaccumulative Pollutants: Pollutants that build up in the food chain. 

Clean Water Act: Federal Act passed in 1972 that contains provisions to restore and maintain 

the quality of the nation’s waters. Section 303(d) of the Clean Water Act establishes the TMDL 

program. 

Conductivity: A measure of water’s ability to conduct an electrical current. Conductivity is 

related to the concentration and charge of dissolved ions in water. 

Designated Uses: Those uses specified in Chapter 173-201A WAC (Water Quality Standards 

for Surface Waters of the State of Washington) for each waterbody or segment, regardless of 

whether or not the uses are currently attained. 

Exceeds Criteria: Fails to meet criteria.

Existing Uses: Those uses actually attained in fresh and marine waters on or after November 

28, 1975, whether or not they are designated uses. Introduced species that are not native to 

Washington, and put-and-take fisheries comprised of non-self-replicating introduced native 

species, do not need to receive full support as an existing use. 

Grab Sample: A discrete sample from a single point in the water column or sediment surface. 

Irrigation Season: In this study, the irrigation season is April through October. 

Legacy Pesticide: Banned pesticides no longer used but that persist in the environment.

Load Allocation: The portion of a receiving waters’ loading capacity attributed to one or more 

of its existing or future sources of nonpoint pollution or to natural background sources. 

Loading Capacity: The greatest amount of a substance that a waterbody can receive and still 

meet water quality standards. 

Margin of Safety (MOS): Required component of TMDLs that accounts for uncertainty about 

the relationship between pollutant loads and quality of the receiving waterbody. 
Yakima Pesticides/PCBs TMDL: Vol 1, WQ Study Findings 

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Municipal Separate Storm Sewer Systems (MS4): A conveyance or system of conveyances 

(including roads with drainage systems, municipal streets, catch basins, curbs, gutters, ditches, 

manmade channels, or storm drains): (i) owned or operated by a state, city, town, borough, 

county, parish, district, association, or other public body having jurisdiction over disposal of 

wastes, stormwater, or other wastes and (ii) designed or used for collecting or conveying 

stormwater; (iii) which is not a combined sewer; and (iv) which is not part of a Publicly Owned 

Treatment Works (POTW) as defined in the Code of Federal Regulations at 40 CFR 122.2. 

National Pollutant Discharge Elimination System (NPDES): National program for issuing, 

modifying, revoking and reissuing, terminating, monitoring and enforcing permits, and imposing 

and enforcing pretreatment requirements under the Clean Water Act. The NPDES program 

regulates discharges from wastewater treatment plants, large factories, and other facilities that 

use, process, and discharge water back into lakes, streams, rivers, bays, and oceans. 

Nonpoint Source: Pollution that enters any waters of the state from any dispersed land-based or 

water-based activities, including but not limited to atmospheric deposition, surface water runoff 

from agricultural lands, urban areas, or forest lands, subsurface or underground sources, or 

discharges from boats or marine vessels not otherwise regulated under the National Pollutant 

Discharge Elimination System Program. Generally, any unconfined and diffuse source of 

contamination. Legally, any source of water pollution that does not meet the legal definition of 

“point source” in section 502(14) of the Clean Water Act. 

Parameter: Water quality constituent being measured. A physical, chemical, or biological 

property whose values determine environmental characteristics or behavior. 

Phase I Stormwater Permit: The first phase of stormwater regulation required under the 

federal Clean Water Act. The permit is issued to medium and large municipal separate storm 

sewer systems (MS4s) and construction sites of five or more acres. 

Phase II Stormwater Permit: The second phase of stormwater regulation required under the 

federal Clean Water Act. The permit is issued to smaller municipal separate storm sewer 

systems (MS4s) and construction sites over one acre. 

Point Source: Sources of pollution that discharge at a specific location from pipes, outfalls, and 

conveyance channels to a surface water. Examples of point source discharges include municipal 

wastewater treatment plants, municipal stormwater systems, industrial waste treatment facilities, 

and construction sites that clear more than 5 acres of land. 

Pollution: Such contamination, or other alteration of the physical, chemical, or biological 

properties, of any waters of the state. This includes change in temperature, taste, color, turbidity, 

or odor of the waters. It also includes discharge of any liquid, gaseous, solid, radioactive, or 

other substance into any waters of the state. This definition assumes that these changes will, 

or are likely to, create a nuisance or render such waters harmful, detrimental, or injurious to 

(1) public health, safety, or welfare, or (2) domestic, commercial, industrial, agricultural, 

recreational, or other legitimate beneficial uses, or (3) livestock, wild animals, birds, fish, or 

other aquatic life. 

Salmonid: Any fish that belong to the family Salmonidae. Basically, any species of salmon, 

trout, or char. www.fws.gov/le/ImpExp/FactSheetSalmonids.htm
Yakima Pesticides/PCBs TMDL: Vol 1, WQ Study Findings 

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Stormwater: The portion of precipitation that does not naturally percolate into the ground or 

evaporate but instead runs off roads, pavement, and roofs during rainfall or snowmelt. 

Stormwater can also come from hard or saturated grass surfaces such as lawns, pastures, 

playfields, and from gravel roads and parking lots. 

Synoptic survey: Data collected simultaneously or over a short period of time. 

Surface Waters of the State: Lakes, rivers, ponds, streams, inland waters, salt waters, wetlands 

and all other surface waters and watercourses within the jurisdiction of Washington State. 

Total Maximum Daily Load (TMDL): A distribution of a substance in a waterbody designed 

to protect it from exceeding water quality standards. A TMDL is equal to the sum of all of the 

following: (1) individual wasteload allocations for point sources, (2) the load allocations for 

nonpoint sources, (3) the contribution of natural sources, and (4) a Margin of Safety to allow for 

uncertainty in the wasteload determination. A reserve for future growth is also generally 

provided. 

Total Suspended Solids (TSS): The suspended particulate matter in a water sample as retained 

by a filter.

Turbidity: A measure of water clarity. High levels of turbidity can have a negative impact on 

aquatic life. 

Wasteload Allocation: The portion of a receiving water’s loading capacity allocated to existing 

or future point sources of pollution. Wasteload allocations constitute one type of water qualitybased effluent limitation. 

Watershed: A drainage area or basin in which all land and water areas drain or flow toward a 

central collector such as a stream, river, or lake at a lower elevation. 

Acronyms and Abbreviations 

CRO Central Regional Office (Department of Ecology) 

DDD Dichloro-diphenyl-dichloroethane 

DDE Dichloro-diphenyl-dichloroethylene 

DDT Dichloro-diphenyl-trichloroethane 

DOC Dissolved organic carbon 

EAP Environmental Assessment Program (Department of Ecology) 

Ecology Washington State Department of Ecology 

EPA U.S. Environmental Protection Agency 

FIFRA Federal Insecticide, Fungicide, and Rodenticide Act 

GC/ECD Gas chromatography/electron capture detection 

HRGC/MS High resolution gas chromatography/mass spectrometry 

LVI Volume injection 

N Number 
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NTU Nephelometric turbidity units 

PCB Polychlorinated biphenyl 

r.m. River mile 

RSBOJC Roza-Sunnyside Board of Joint Control 

SOP Standard operating procedure 

SPE Solid phase extraction 

SPMD Semipermeable membrane device 

SWMP Surface Water Monitoring Program for Pesticides in Salmonid Bearing Streams 

TMDL (See Glossary above) 

TNVSS Total non-volatile suspended solids 

TOC Total organic carbon 

Trib Tributary 

TSS (See Glossary above) 

USBR U.S. Bureau of Reclamation 

USGS U.S. Geological Survey 

WDOH Washington State Department of Health 

WRIA Water Resource Inventory Area 

WSDA Washington State Department of Agriculture 

WWTP Wastewater treatment plant