Permit No.: WA0037168 

City of Puyallup WWTP 

Fact Sheet 

The U.S. Environmental Protection Agency (EPA) 

Proposes to Reissue a National Pollutant Discharge Elimination System (NPDES) Permit to 

Discharge Pollutants Pursuant to the Provisions of the Clean Water Act (CWA) to: 

City of Puyallup Wastewater Treatment Plant 

1602 18th St NW 

Puyallup, WA 98371 

NPDES Permit Number: WA0037168 

Public Notice Start Date: ******, 2014 

Public Notice Expiration Date: ******, 2014 

Technical Contact: John Drabek 206-553-8257 

1-800-424-4372 ext. 3-8257 (within Region 10) 

 Email: drabek.john@epa.gov 

The EPA Proposes To Reissue NPDES Permit 

The EPA proposes to reissue the NPDES permit to the facility referenced above. The draft 

permit places conditions on the discharge of pollutants from the wastewater treatment plant to 

waters of the United States. In order to ensure protection of water quality and human health, the 

permit place limits on the types and amounts of pollutants that can be discharged from each 

facility. 

This Fact Sheet includes: 

 information on public comment, public hearing, and appeal procedures 

 a listing of proposed effluent limitations and other conditions for the facility 

 a map and description of the discharge location 

 technical material supporting the conditions in the permit 

Puyallup Tribe Certification 

The EPA will request that the Puyallup Tribe to certify the NPDES permit for this facility, under 

Section 401 of the Clean Water Act. Comments regarding the certification should be directed to: 
Permit No.: WA0037168 

City of Puyallup WWTP 1 

Puyallup Tribe 

Environmental Department 

2002 28th Street 

Tacoma, WA 98404 

253 573-7851 

Public Comment 

Persons wishing to comment on or request a public hearing for the draft permit may do so in 

writing by the expiration date of the Public Notice. All comments or requests for a public hearing 

should include the name, address and telephone number of the commentator and a concise 

statement of the exact basis of any comment and the relevant facts upon which it is based. All 

comments and requests for a public hearing must be in writing and should be submitted to EPA 

as described in the Public Comments Section of the attached Public Notice. 

If no significant comments are received, the tentative conditions in the draft permit will become 

final, and the permit will become effective upon issuance. If comments are received, EPA will 

address the comments and issue the permit. The permit will become effective 33 days after the 

issuance date, unless a request for an evidentiary hearing is submitted within 33 days. 

Documents are Available for Review 

The draft NPDES permit and related documents can be reviewed or obtained by visiting or 

contacting EPA’s Regional Office in Seattle between 8:30 a.m. and 4:00 p.m., Monday through 

Friday (See address below). 

United States Environmental Protection Agency 

Region 10 

1200 Sixth Avenue, OWW-130 

Seattle, Washington 98101 

(206) 553-0523 or 

1-800-424-4372 (within Alaska, Idaho, Oregon and Washington) 

The fact sheet and draft permit are also available at: 

EPA Washington Operations Office 

300 Desmond Drive SE 

Lacey, WA 98503 

360 753-9080 

Puyallup Tribe 

Environmental Department 

3009 E. Portland Ave, 

Tacoma, WA 98404 

253 573-7851 

Washington Department of Ecology 

300 Desmond Drive SE 

Lacey, WA 98503 

360 407-6275
 
Permit No.: WA0037168
 

City of Puyallup WWTP 2 

LIST OF ACRONYMS AND ABBREVIATIONS...................................................................................... 4
 

I. APPLICANT ............................................................................................................................................. 5
 

II. FACILITY ACTIVITY ............................................................................................................................ 5
 

III. RECEIVING WATER............................................................................................................................ 5
 

A. Discharge Location. ............................................................................................................................. 5
 

B. Beneficial Uses..................................................................................................................................... 5
 

C. Existing or Potential Impairments of Water Quality............................................................................ 5
 

IV. FACILITY BACKGROUND ................................................................................................................. 6
 

A. Treatment System ................................................................................................................................ 6
 

B. Permit Background ............................................................................................................................... 6
 

C. Compliance Status ................................................................................................................................ 6
 

V. EFFLUENT LIMITATIONS................................................................................................................... 7
 

VI. PRETREATMENT PROGRAM.......................................................................................................... 10
 

VII. MUNICIPAL SEWAGE SLUDGE/BIOSOLIDS MANAGEMENT ................................................. 10
 

VIII. MONITORING REQUIREMENTS .................................................................................................. 10
 

A. Effluent Monitoring ........................................................................................................................... 10
 

B. Method Detection Limits.................................................................................................................... 13
 

C. Whole Effluent Toxicity..................................................................................................................... 13
 

D. Receiving Water Monitoring.............................................................................................................. 13
 

E. Outfall Evaluation .............................................................................................................................. 14
 

F. Infiltration and Inflow Evaluation ...................................................................................................... 14
 

G. Representative Sampling .................................................................................................................... 15
 

IX. OTHER PERMIT CONDITIONS........................................................................................................ 15
 

A. Quality Assurance Plan...................................................................................................................... 15
 

B. Arsenic Monitoring ............................................................................................................................ 15
 

C Electronic Submission of Discharge Monitoring Reports ................................................................... 17
 

D. Operation and Maintenance Plan ....................................................................................................... 18
 

E. Additional Permit Provisions.............................................................................................................. 18
 

X. OTHER LEGAL REQUIREMENTS .................................................................................................... 18
 

A. Endangered Species Act..................................................................................................................... 18
 

B. The Magnuson-Stevens Fishery Conservation and Management Act ................................................ 20
 

C. Certification........................................................................................................................................ 21
 
Permit No.: WA0037168 

City of Puyallup WWTP 3 

D. Permit Expiration ............................................................................................................................... 21
 

REFERENCES ........................................................................................................................................... 21
 

APPENDIX A – CITY OF PUYALLUP FACILITY LOCATION ........................................................... 23
 

APPENDIX B – CITY OF PUYALLUP WASTE STREAMS AND TREATMENT PROCESSES ........ 25
 

APPENDIX C – BASIS FOR EFFLUENT LIMITATIONS ..................................................................... 27
 

APPENDIX D – EXAMPLE EFFLUENT LIMIT CALCULATIONS...................................................... 43
 

APPENDIX E – MONITORING DATA .................................................................................................... 51
 

APPENDIX F – PRE-CERTIFICATION OF DRAFT PERMIT ............................................................. 122
 

LIST OF TABLES 

Table 1: Reported Effluent Limit Violations 2003 Through 2011 

Table 2: Outfall 001 Effluent Limits Comparison 

Table 3: Outfall 001 Monitoring Requirements 

Table 4: Receiving Water Monitoring Requirements in the Puyallup River 

Table 5: Ambient Arsenic in the Puyallup River 

Table B-1: Pollutants Detected in Discharge (2003 to 2011) 

Table C-1: Dilution Factors at Critical Mixing Conditions 

Table C-2: BOD5 Draft Limits 

Table C-3: TSS Draft Limits 

Table C-4: Unionized Ammonia Criteria 

Table C-5: Total Ammonia Limits 

Table C-6: Metals Criteria for the Puyallup River 

Table C-7: Metals Limits (total recoverable) for the City of Puyallup Permit 

Table C-8: Determination of pH Limits 

Table D-1: Unionized Ammonia Criteria 

Table D-2: Reasonable Potential Calculations and Limits 

LIST OF FIGURES 

Figure 1: Total Recoverable Arsenic in Puyallup Wastewater Treatment Plant Effluent 

Figure A-1: Puyallup Wastewater Treatment Facility Outfall Location 

Figure A-2: Puyallup Wastewater Treatment Facility Aerial Photo 

Figure C-1: Mixing Zone 
 

 

Permit No.: WA0037168 

City of Puyallup WWTP 4 

LIST OF ACRONYMS AND ABBREVIATIONS 

AML Average monthly limit 

BMP Best management practices 

BOD5 Five-day biochemical oxygen demand 

CFR Code of Federal Regulations 

cfs Cubic feet per second 

CWA Clean Water Act 

DMR Discharge monitoring report 

CV Coefficient of variation 

Ecology Washington State Dept. of Ecology 

EPA United States Environmental Protection Agency 

lb/day Pounds per day 

LTA Long term average 

MDL Maximum daily limit or method detection limit 

mgd Million gallons per day 

mg/L Milligrams per liter 

ml	 Milliliters 

MOA Memorandum of agreement 

NPDES National Pollutant Discharge Elimination System 

O&M Operation and maintenance 

POTW	 Publicly owned treatment works 

RP Reasonable potential 

TMDL Total maximum daily load 

TSD Technical Support Document for Water Quality-based Toxics Control, 

(EPA1991) 

TSS Total suspended solids 

USGS United States Geological Survey 

WWTP Wastewater treatment plant 

WLA Wasteload allocation 

μg/L Micrograms per liter 
Permit No.: WA0037168 

City of Puyallup WWTP 5 

I. APPLICANT 

Facility Name: City of Puyallup Wastewater Treatment Plant 

NPDES Permit No: WA0037168 

Location: 1602 18th St NW, Puyallup, WA 98371 

Facility Contact: Don Lange, Wastewater Treatment Plant Supervisor 

II. FACILITY ACTIVITY 

The City of Puyallup owns and operates a municipal treatment facility that provides secondary 

treatment and disinfection of domestic and industrial wastes prior to discharge to the Puyallup 

River. The maximum month design flow of the facility is 13.98 million gallons per day (mgd). 

In the period from August 2003 through December 2011, the treatment plant had an average 

annual flow of 4.07 mgd, and a maximum monthly average flow of 8.81 mgd. Biosolids 

generated during the treatment process are hauled by a private contractor to a land application 

site in eastern Washington. 

See Appendix A for a map of the location of the treatment plant and discharge. Appendix B 

contains additional information on the treatment processes and waste streams. 

III. RECEIVING WATER 

A. Discharge Location. 

The Puyallup Wastewater Treatment Plant (WWTP) discharges to the Puyallup River (latitude 

47O 12' 26" N, longitude 122O 19' 11" W) located within the 1873 survey area of the Puyallup 

Reservation. The Puyallup Tribe of Indians is the beneficial owner of the bed and banks (to the 

mean high water mark) of the Puyallup River within the 1873 survey area of the Puyallup 

Reservation, which the United States holds in trust for the Tribe. 

B. Beneficial Uses. 

The Puyallup Tribe’s Water Quality Standards designate beneficial uses for waters of the 

Reservation. The current tribal standards for the Puyallup River designate the river as Class A in 

the vicinity of the outfall. Characteristic uses include the following: domestic, industrial and 

agricultural water supply, stock watering, fish and shellfish (including salmonids, crustaceans 

and other shellfish, and other fish), wildlife habitat, ceremonial and religious water use, 

commerce, navigation, and primary and secondary recreation. 

C. Existing or Potential Impairments of Water Quality. 

A 1994 Ecology water quality study of the river identified the potential for future problems in 

meeting the dissolved oxygen criteria if existing NPDES facilities reached their design capacity. 

As a result, Ecology established a seasonal preventative total maximum daily load (TMDL) for 

ammonia and five-day biochemical oxygen demand (BOD5) for the Puyallup River basin and 

tributaries effective May 1 through October 31 (Ecology, 1993 and 1994). Subsequent Puyallup 

WWTP permits also incorporated a BOD/ammonia trade as allowed in the 1993 Puyallup River 

TMDL. See section IV of Appendix C for details. 

The Puyallup River is also one of many in the State of Washington that contain naturallyoccurring arsenic in amounts that may be greater than human health criteria for arsenic. The 
 

Permit No.: WA0037168 

City of Puyallup WWTP 6 

Department of Ecology determined in 20021 that arsenic concentrations in Washington rivers and 

streams are typically in the range of 0.2 - 1.0 ug/L, whereas concentrations greater than 2 to 5 

ug/L may indicate contamination from anthropogenic sources. Upstream Puyallup River arsenic 

levels from Ecology’s Puyallup river monitoring station #10A070 were found in the range of 

0.47 - 1.14 ug/L (data from August 2001 - August 2006). See Section IX.B. for information 

about arsenic monitoring required by the draft permit. 

IV. FACILITY BACKGROUND 

A. Treatment System 

The original collection system for the City’s wastewater was constructed in 1905 as a gravity 

sewer system discharging directly into the Puyallup River. In 1955, a 6.0 mgd sewage treatment 

plant providing primary treatment and disinfection was constructed at the present site. In 1984, 

the treatment plant was upgraded to a secondary treatment system utilizing rotating biological 

contactors (RBCs). A sewer system rehabilitation project completed in 1981 significantly 

reduced inflow and infiltration. In April 1999, the RBCs were replaced by an activated sludge 

system and chlorination was replaced by ultraviolet disinfection. Although the original 

collection system was built as a combined storm and sanitary system, the system is now 100 

percent separated. 

B. Permit Background 

In 1997, EPA, the Puyallup Tribe, and Ecology signed a memorandum of agreement (MOA) 

regarding implementation of the NPDES permit program on the Puyallup Reservation. The 

MOA recognized that the federal government has the authority to issue NPDES permits for 

discharges to waters of the Reservation. 

A draft permit for the facility was proposed in June 2000. Because changes were made to the 

proposed effluent limits following public notice of the draft permit (because of additional 

background and monitoring data), a new draft permit was prepared and was issued in August 

2003. The permit was then modified in April 2008 to include language instituting the facility’s 

new pretreatment program. 

An NPDES application for permit issuance was submitted by the permittee on December 17, 

2007. The EPA determined that the application was timely and complete. Therefore, pursuant to 

40 CFR 122.6., the permit has been administratively extended and remains fully effective and 

enforceable. 

C. Compliance Status 

Table 1, below, summarizes the reported effluent limit violations for the Puyallup WWTP based 

on Discharge Monitoring Reports (DMRs) between August 2003 and December 2011. 

1 http://www.ecy.wa.gov/pubs/0203045.pdf, Publication No. 02-03-045. 
   

   

           

   

   

   

   

   

       

   

Permit No.: WA0037168 

City of Puyallup WWTP 7 

TABLE 1. E90 Report – Reported Effluent Limit Violations 2003 Through 2011 

Monitoring

Period End Date

Code Expansion

for Parameter

Code

Concentration

Average Value

Concentration

Maximum Value

Average Limit

Concentration

Maximum Limit

Concentration

Effluent

Violation Code

for Parameter

Measurement

Code Expansion

for Effluent

Violation Code

for Parameter

Measurement

Quantity

Average

Value

Quantity

Maximum

Value

Average

Quantity Limit

Maximum

Quantity Limit

30-Nov-06 

ZINC TOTAL 

RECOVERABLE 72.4 72.4 70 102 E90 

NUMERIC 

VIOLATION 

NUMERIC VIOL 1.8 1.8 8.2 11.9 

31-Jul-09 

MERCURY 

TOTAL 

RECOVERABLE 0 >0.0001 0.052 0.072 E90 

NUMERIC 

VIOLATION 

NUMERIC VIOL >0 >0 0.006 0.008 

30-Jun-06 

NITROGEN, 

AMMONIA 

TOTAL (AS N) 5 6 4.2 12 E90 

NUMERIC 

VIOLATION 

NUMERIC VIOL 14 27 490 792 

30-Apr-08 

LEAD TOTAL 

RECOVERABLE 0.5 0.5 6.1 10.5 E90 

NUMERIC 

VIOLATION 

NUMERIC VIOL 0.02 2 0.71 1.22 

V. EFFLUENT LIMITATIONS 

EPA followed the Clean Water Act (CWA), tribal and federal regulations, and EPA’s 1991 

Technical Support Document for Water Quality-Based Toxics Control (TSD) to develop the 

proposed effluent limits. In general, the CWA requires that the effluent limits for a particular 

pollutant are the more stringent of either the technology-based or water quality-based limits. 

Appendix C provides the basis for the development of technology-based and water quality-based 

effluent limits. Technology-based limits are set based on the level of treatment that is achievable 

using readily available technology. For publicly owned treatment works, federal regulations 

include technology-based limits for three parameters: five-day biochemical oxygen demand 

(BOD5), total suspended solids (TSS), and pH. Puyallup Tribal standards have also specified a 

technology-based limit for fecal coliform bacteria. 

EPA evaluates the technology-based limits to determine whether they are adequate to ensure that 

water quality standards are met in the receiving water. If the limits are not adequate, EPA must 

develop additional water quality-based limits. These limits are designed to prevent exceedances 

of the Puyallup Tribe’s water quality standards in the Puyallup River. The proposed permit 

includes water quality-based limits for BOD5, ammonia, and copper. Limits for lead, mercury, 

and zinc were not carried through from the previous permit based on the lack of reasonable 

potential to exceed water quality criteria. New information not available during the development 

of the previous permit formed the basis for removing these limits without backsliding or risking 

negative impacts water quality. The new information came in the form of a larger data set 

obtained using consistent and correct sampling and analytical methods. This change is consistent 

with language in Clean Water Act section 303(d)(4)(B ) regarding the revision of certain effluent 

limits. Appendix D provides an example calculation for the development of a water qualitybased permit limit. 

Table 2 compares the limits in the existing permit with those in the draft permit. The draft 

permit specifies more stringent limits for pH and ammonia during the winter. Recent monitoring 

data for all other parameters were below the draft permit limits. 
 

 

 

 

 

 

 

 

 

 

Permit No.: WA0037168 

City of Puyallup WWTP 8 

Table 2 

Outfall 001 Effluent Limits Comparison 

Parameters Average Monthly Limit Average Weekly Limit Maximum Daily Limit 

Draft 

Permit 

(2013) 

Existing 

Permit2 

Draft 

Permit 

(2013) 

Existing 

Permit2 Draft 

Permit 

(2013) 

Existing 

Permit2 

BOD5

 mg/L 30 30 45 45 --- ---

 lbs/day1

 2,179 2,179 3,268 3,268 --- ---

 Minimum Percent 

Removal 85 85 85 85 --- ---

TSS 

 mg/L 30 30 45 45 --- ---

 lbs/day1 2,333 2,333 3,499 3,499 --- ---

Minimum Percent 

Removal 85 85 85 85 

Fecal Coliform #/100 

mL3 100 100 --- --- --- ---

Total Ammonia as N: 

November 1 - April 30

 mg/L 5.4 6.8 --- --- 16.1 17.6 

 lb/day 793 793 --- --- 2,622 2,862 

Total Ammonia as N: 

May 1 - October 31

 mg/L 4.2 4.2 --- --- 12.0 12.0 

 lb/day 490 490 --- --- 792 792 
 

 

 

 

 

 

Permit No.: WA0037168 

City of Puyallup WWTP 9 

Table 2 

Outfall 001 Effluent Limits Comparison 

Parameters Average Monthly Limit Average Weekly Limit Maximum Daily Limit 

Draft 

Permit 

(2013) 

Existing 

Permit2 

Draft 

Permit 

(2013) 

Existing 

Permit2 Draft 

Permit 

(2013) 

Existing 

Permit2 

Copper, Total 

Recoverable 

 μg/l 8.5 8.5 --- --- 13.7 13.7

 lb/day 0.99 0.99 --- --- 1.60 1.60 

Lead, Total Recoverable

 μg/l NA 6.1 --- --- NA 10.5 

 lb/day NA 0.71 --- --- NA 1.22 

Mercury 

μg/l NA 0.052 --- --- NA 0.072

 lb/day NA 0.006 --- --- NA 0.008 

Zinc, Total Recoverable 

μg/l NA 70 --- --- NA 102

 lb/day NA 8.2 --- --- NA 11.9 

pH, std units4 

6.4 – 9.0 6.4 – 9.0 

1. Mass-based loadings are based on a design flow of 13.98 mgd, (or 19.5 mgd for winter ammonia 

loadings). See Appendix C Basis for Effluent Limits. 

2. The existing permit limits were issued in 2003. 

3. The draft permit requires that no more than 10% of samples over a 30-day period may exceed 

200/100 mL. 

4. The draft permit requires that the pH be within the specified range of 6.4 to 9.0 at all times. 

In addition to the limits for specific parameters, the draft permit authorizes the discharge of only 

those pollutants resulting from facility processes, waste streams, and operations that have been 
Permit No.: WA0037168 

City of Puyallup WWTP 10 

clearly identified in the permit application process. The draft permit also requires that the 

discharge be free from floating solids, visible foam in other than trace amounts, or oily wastes 

that produce a sheen on the surface of the receiving water. 

VI. PRETREATMENT PROGRAM 

Section 301(b) of the CWA requires that industrial users who discharge to publicly owned 

treatment works comply with pretreatment requirements established under section 307 of the 

CWA. The objectives of the pretreatment program are: 1) to prevent the introduction of 

pollutants to the treatment system that will interfere with the plant’s operation, that could pass 

untreated through the system and contribute to water quality problems, or otherwise be 

incompatible with the treatment plant, and 2) to improve opportunities to reclaim and recycle 

municipal and industrial waste water and sludge. 

The previous permit was modified in April 2008 to introduce a pretreatment program developed 

by the City in accordance with the general pretreatment regulations under 40 CFR §403. The 

modified permit required a local limits evaluation for pollutants of concern, the institution of a 

local sewer use ordinance, and the preparation of policies and procedures necessary to run the 

program properly. The draft permit includes language addressing ongoing pretreatment 

operations in the City. 

The previous and draft permit require that metals analyses be conducted using the most sensitive 

EPA-approved methods, unless a less sensitive method is approved by EPA's Pretreatment 

Coordinator. This provision ensures that the City will use the most sensitive EPA-approved 

analytical method currently available when influent or effluent concentrations for a particular 

pollutant are near or below the lowest method detection limit without imposing the financial 

burden of using these methods when a less sensitive method will provide quantifiable data. 

VII. MUNICIPAL SEWAGE SLUDGE/BIOSOLIDS MANAGEMENT 

Currently, dewatered sludges are hauled to eastern Washington for land application. 

The EPA Region 10 separates wastewater and sludge permitting. The EPA has authority under 

the CWA to issue separate sludge-only permits for the purposes of regulating biosolids. The 

EPA may issue a sludge-only permit to each facility at a later date, as appropriate. 

Until future issuance of a sludge-only permit, sludge management and disposal activities at each 

facility continue to be subject to the national sewage sludge standards at 40 CFR Part 503 and 

any requirements of the State’s biosolids program. The Part 503 regulations are selfimplementing, which means that facilities must comply with them whether or not a permit has 

been issued. 

VIII. MONITORING REQUIREMENTS 

A. Effluent Monitoring 

Section 308 of the CWA and federal regulation 40 CFR 122.44(i) require that monitoring be 

included in permits to determine compliance with effluent limitations. Monitoring may also be 

required to gather data for future effluent limitations or to monitor effluent impacts on receiving 
 

Permit No.: WA0037168 

City of Puyallup WWTP 11 

water quality. The City of Puyallup is responsible for conducting the monitoring and for 

reporting results to EPA on DMRs. Table 3 compares the proposed monitoring requirements in 

the draft permit to those in the 2003 permit. Monitoring frequency is based on the minimum 

sampling necessary to adequately monitor the facility’s performance as well as the monitoring 

requirements in the 2003 permit. 

Continuous temperature monitoring is required to better characterize temperature. The State of 

Washington Department of Ecology Permit Writer’s Manual, December 2011, (Publication no. 

92-109), page VI-55, states recommended analytic protocol for temperature is continuous. The 

EPA, Tribe, USFWS and NOAA concur continuous temperature monitoring is necessary. 

Table 3: Outfall 001 Monitoring Requirements 

Parameter Draft Sample Frequency 2003 Sample Frequency 

BOD5, mg/L, lb/day, percent 

removal1 

5/Week 5/Week 

TSS, mg/L, lb/day, percent 

removal1 

5/Week 5/Week 

Fecal Coliform Bacteria, #/100 

mL 

5/Week 5/Week 

Total Ammonia as N, mg/L 2/Week 2/Week 

Copper, Total Recoverable, 

ug/L 

Monthly Monthly 

pH, standard units2 Continuous Continuous 

Flow, mgd Continuous Continuous 

Temperature, °C Continuous5 Daily 

Chronic Whole Effluent 

Toxicity Testing 

Annual Annual 

Hardness, mg/L CaCO3 Monthly Monthly 

Acute Whole Effluent Toxicity Annual Annual 

Arsenic, Total Quarterly for 5 yrs (influent 

and effluent), coinciding 

where possible with 

quarterly arsenic 

NA 
Permit No.: WA0037168 

City of Puyallup WWTP 12 

monitoring in the receiving 

water (Table 4) 

Arsenic, Inorganic Quarterly for 5 yrs (effluent 

only), coinciding where 

possible with quarterly 

arsenic monitoring in the 

receiving water (Table 4) 

NA 

Total Kjeldahl Nitrogen, 

mg/L 

Monthly NA 

Nitrogen, NO2+NO3, mg/L Monthly NA 

Total Phosphorus, mg/L Monthly NA 

Notes: 

1. The draft permit and the 2003 permit require influent and effluent monitoring to determine 

compliance with effluent limitations and percent removal requirements. 

2. The draft permit requires the City to report the number and duration of pH excursions during 

the month. 

3. Monitoring requirements for new parameters (bold text). 

4. Arsenic monitoring includes quarterly upstream ambient monitoring to help evaluate 

arsenic partitioning and inorganic arsenic reasonable potential (see Table 4). 

5. Continuous temperature monitoring must begin no later than six months after the 

effective date of the permit. 

New nutrients monitoring requirements are being added in light of findings from the South Puget 

Sound Dissolved Oxygen Study. The need for this study became evident when, in their 2008 

Water Quality Assessment, the Washington State Department of Ecology found 24 locations in 

South Puget Sound that were impaired due to a lack of dissolved oxygen. The South Puget 

Sound Dissolved Oxygen Study evaluated a number of different sources for nitrogen, as nitrogen 

is the main pollutant responsible for the low marine dissolved oxygen levels. The study 

identified the Puyallup River as a source of nitrogen loading into Puget Sound. EPA determined 

that the City of Puyallup should conduct monitoring of nutrient species in their effluent to better 

characterize their contribution of these pollutants to the Puyallup River throughout the year given 

that both nitrogen and phosphorus contribute to a loss of dissolved oxygen in receiving waters. 

Under the authority of Clean Water Act Section 308, this increased monitoring has been included 

in the draft permit. 
Permit No.: WA0037168 

City of Puyallup WWTP 13 

B. Method Detection Limits 

EPA’s regulations require that Permittees monitor for compliance with effluent limits using 

methods promulgated by EPA at 40 CFR Part 136. For all pollutants, the draft permit requires 

the City to use an EPA-approved method with an MDL 0.1 times the effluent limitation or the 

most sensitive EPA-approved method, whichever is greater. This provision ensures that, to the 

extent possible, data can be used to accurately determine compliance with permit limits without 

imposing an undue burden on the City where a less sensitive method will give accurate data. 

Mercury 

An August 23, 2007, memorandum from James A. Hanlon to the Water Division Directors 

clarifies and explains that, in light of existing regulatory requirements for NPDES permits, only 

the most sensitive methods, such as Methods 1631E and 245.7, are appropriate in most instances 

for use in deciding whether to set a permit limitation for mercury and for sampling and analysis 

of mercury pursuant to the monitoring requirements within a permit. See Analytical Methods for 

Mercury in National Pollutant Discharge Elimination System (NPDES) Permits, which is 

available at http://www.epa.gov/npdes/pubs/mercurymemo_analyticalmethods.pdf. 

The permit requires Methods 1631E or 245.7 for mercury monitoring. 

C. Whole Effluent Toxicity 

Federal regulations at 40 CFR 122.44(d)(1) require that permits contain limits on whole effluent 

toxicity when a discharge has reasonable potential to cause or contribute to an exceedance of a 

water quality standard. Section 5, paragraphs 1 and 2 of the Puyallup water quality standards 

prohibit the discharge of toxic substances in toxic amounts and require that toxicity testing be 

used to determine compliance with this prohibition. 

Whole effluent toxicity tests are laboratory tests that replicate to the greatest extent possible the 

total effect and actual environmental exposure of aquatic life to effluent toxicants without 

requiring the identification of specific toxicants. Whole effluent toxicity tests use small 

vertebrate and invertebrate species and/or plants to measure the aggregate toxicity of an effluent. 

There are two different durations of toxicity tests: acute and chronic. Acute toxicity tests 

measure survival over a 48- or 96-hour exposure. Chronic toxicity tests measure reductions in 

survival, growth, and reproduction over a 7-day exposure. 

 The City of Puyallup’s 2003 permit required annual acute and chronic toxicity testing. This 

testing showed no reasonable potential to cause or contribute to exceedances of water quality 

standards. The draft permit continues the annual WET testing frequency required by the previous 

permit. 

D. Receiving Water Monitoring 

Receiving water monitoring is used to evaluate if the effluent is causing or contributing to an 

instream excursion of the water quality criteria. The draft permit requires the Permittee to 

conduct ambient monitoring using test methods that achieve the same MDLs as are necessary for 

effluent sampling. To the extent practicable, receiving water monitoring must occur on the same 

day as effluent sample collection and during low river flow conditions. Upstream and 

downstream monitoring must also occur on the same day to enable a comparison of downstream 

concentrations with background concentrations. The proposed receiving water monitoring 

requirements for the draft permit are provided in Table 4. The monitoring frequency has been 
 

Permit No.: WA0037168 

City of Puyallup WWTP 14 

reduced for this permit cycle based on data collected in the previous permit cycle that confirmed 

water quality criteria are being met in the receiving water. However, for the same reasons stated 

for continuous temperature monitoring of the effluent, continuous temperature monitoring is 

required for the receiving water. 

Table 4: Receiving Water Monitoring Requirements in the Puyallup River 

Parameter Units Upstream 

Sampling 

Frequency 

Downstream 

Sampling 

Frequency 

Sampling Method 

Total Ammonia as N mg/L Once/year Once/year Grab 

Temperature C Continuous Continuous Recording2 

pH standard 

units 

Once/year Once/year Grab 

Hardness as CaCO3 mg/L Once/year Once/year Grab 

Arsenic (total, 

dissolved, and 

inorganic) 

μg/L Quarterly1

 Quarterly1 Grab 

Copper μg/L Once/year Once/year Grab 

Note: 1Ambient arsenic monitoring for 5 years as part of Special Condition II. B., Arsenic 

Monitoring. 

2

Continuous temperature monitoring must begin no later than six months after the effective date 

of the permit. 

E. Outfall Evaluation 

In early 1998 the City modified the existing diffuser to prevent damage by gravel and rocks. The 

diffuser ports are now angled downstream with a “Tide Flex” valve connected with a neoprene 

sleeve and flange. To ensure that the new diffuser is not damaged by sediment deposition, the 

draft permit requires the City to conduct an annual outfall evaluation. 

F. Infiltration and Inflow Evaluation 

In the past, significant rainfall events have been a source of primary-treated overflows to the 

Puyallup River from the outfall. Infiltration and inflow to the conveyance system might include 

rainwater entering manholes, roof drain connections, combined stormwater and sewage piping, 

infiltration through leaky underground pipes, etc. The draft permit requires that the Permittee 

conduct a comprehensive study that includes a preliminary evaluation of the sewerage facility 

and a system-wide inventory/evaluation survey that identifies the causes of the 
Permit No.: WA0037168 

City of Puyallup WWTP 15 

untreated/primary-treated overflows and contains deadlines for correcting the problems. This 

report is due three years from the effective date of the permit. 

G. Representative Sampling 

Federal regulations require representative sampling whenever a bypass, spill, or non-routine 

discharge of pollutants occurs, if the discharge may reasonably be expected to cause or 

contribute to a violation of an effluent limit under the permit (40 CFR 122.41[j]). If such a 

discharge occurs, the City must conduct additional, targeted monitoring to quantify the effects of 

the discharge on the final effluent. This provision is included in the draft permit because routine 

monitoring could easily miss a permit violation or water quality standard exceedance resulting 

from a bypass, spill, or non-routine discharge. 

IX. OTHER PERMIT CONDITIONS 

A. Quality Assurance Plan 

Federal regulations require Permittees to properly operate and maintain their facilities, including 

“adequate laboratory controls and appropriate quality assurance procedures” (40 CFR 122.41(e)). 

To implement this requirement, the draft permit requires that the City update the Quality 

Assurance Plan (QAP) required by the previous permit to reflect any substantive changes in 

monitoring requirements. An up-to-date QAP will help to ensure that monitoring data are 

accurate and to explain data anomalies if they occur. The City is required to implement the plan 

within 120 days of the effective date of the draft permit. The QAP must include standard 

operating procedures the City will follow for collecting, handling, storing and shipping samples, 

laboratory analysis, and data reporting. 

B. Arsenic Monitoring 

Section 308(a)(3)(A) of the Clean Water Act authorizes EPA to require reports, monitoring 

equipment or methods, expanded sampling, or any other information that would help establish or 

determine compliance with effluent limits, prohibitions, effluent standards, pretreatment 

standards, or standards of performance under the CWA. Further monitoring is necessary in order 

to investigate the effluent from the City of Puyallup wastewater treatment plant with respect to 

the Puyallup Tribal human health standard for arsenic of 0.018 ppb. The permit includes influent, 

effluent and receiving water monitoring. 

Figure 1, below, depicts the amount of total recoverable arsenic in the Puyallup WWTP effluent. 

While this amount of arsenic does not threaten aquatic life, the inorganic portion may be present 

in sufficient quantities to exceed the human health standard for arsenic given the consumption of 

both water and aquatic organisms together. Consequently, the permit requires the Permittee to 

conduct a limited round of inorganic arsenic monitoring to determine whether or not there should 

be a follow up study to determine if arsenic in the treatment plant effluent is naturally-occurring 

arsenic, or if it is of commercial or industrial origin. 
 

Permit No.: WA0037168 

City of Puyallup WWTP 16 

Figure 1: Total Recoverable Arsenic in Puyallup Wastewater Treatment Plant Effluent 

Arsenic has been found in ambient river samples taken upstream of the Puyallup WWTP 

discharge. According to a 2002 Department of Ecology report titled Results and 

Recommendations from Monitoring Arsenic Levels in 303(d) Listed Rivers in Washington2, 

during low flows arsenic concentrations in the Puyallup River range from approximately 

0.76 to over 1.5 ug/L (ppb). Ecology argues in the report against the inclusion of the 

Puyallup River in a 303(d) list for arsenic due to the likelihood that the arsenic is naturallyoccurring. Table 5 below contains ambient arsenic data collected for the 2002 Ecology 

report. 

TABLE 5: Ambient Arsenic in the Puyallup River 

Location Date Arsenic 

(ug/L) 

Temperature 

(

oC) 

Conductivity 

(umhos/cm) 

TSS 

(mg/L) 

Puyallup R. 

above 

Electron 

9/26/2001 0.76 7.7 62 371 

Puyallup R. 

above 

Carbon 

River 

9/26/2001 1.2 9.3 56 558 

2 Ecology publication number 02-03-045, also available online at (accessed 5/2009): 

http://www.ecy.wa.gov/biblio/0203045.html 
 

Permit No.: WA0037168 

City of Puyallup WWTP 17 

Carbon 

River 

9/26/2001 1.0 10.8 66 717 

Puyallup R. 

above White 

River 

9/26/2001 1.5 10.2 65 1000 

White River 9/26/2001 1.3 13.0 112 92 

Puyallup R. 

@ Meridian 

St. 

9/26/2001 1.0 11.5 79 313 

The potable water supply for the City of Puyallup is a series of groundwater wells and springs, as 

well as a tie-in with the City of Tacoma water supply. The City of Tacoma obtains much of their 

water from the Green River. Recent water quality reports from the Cities of Puyallup and 

Tacoma detail the amount of arsenic in the potable water supply. The reports indicate that the 

maximum arsenic concentration in the Puyallup system was 6 ppb, and in Tacoma the maximum 

concentration was 7 ppb3

. Neither system exceeds the federal drinking water standard of 10 ppb. 

However, this information about the potable water supply could explain the source of arsenic in 

the Puyallup WWTP effluent. 

As described in the permit, the Permittee must conduct quarterly arsenic monitoring. The results 

will be used to determine if there is reasonable potential for inorganic arsenic to exceed the 

human health standard. 

 C Electronic Submission of Discharge Monitoring Reports 

The draft permit requires that the permittee submit DMR data electronically using NetDMR 

within six months of the effective date of the permit. NetDMR is a national web-based tool that 

allows DMR data to be submitted electronically via a secure Internet application. NetDMR 

allows participants to discontinue mailing in paper forms under 40 CFR 122.41 and 403.12. 

Under NetDMR, all reports required under the permit are submitted to EPA as an electronic 

attachment to the DMR. Once a permittee begins submitting reports using NetDMR, it is no 

longer required to submit paper copies of DMRs or other reports to EPA or the Department of 

Ecology. Paper submissions to the Puyallup Tribe shall continue for the duration of the permit. 

The EPA currently conducts free training on the use of NetDMR. Further information about 

NetDMR, including upcoming trainings and contacts, is provided on the following website: 

http://www.epa.gov/netdmr. The permittee may use NetDMR after requesting and receiving 

permission from EPA Region 10. 

3 Puyallup water supply report for 2006 (accessed 5/2009): 

http://www.cityofpuyallup.org/files/library/5c171d6575f6b030.pdf. Tacoma water supply report for 2007 

(accessed 5/2009): http://www.mytpu.org/files/library/2007-water-quality_002.pdf. 
Permit No.: WA0037168 

City of Puyallup WWTP 18 

D. Operation and Maintenance Plan 

Section 402 of the CWA and federal regulations 40 CFR 122.44(k)(2) and (3) authorize EPA to 

require best management practices, or BMPs, in NPDES permits. BMPs are measures for 

controlling the generation of pollutants and their release to waterways. For municipal facilities, 

these measures are typically included in the facility’s Operation & Maintenance (O&M) plan. 

These measures are important tools for waste minimization and pollution prevention. 

The draft permit requires the City of Puyallup to update existing or incorporate new BMPs 

as appropriate into their O&M plan within 180 days of permit issuance. Specifically, the 

City must consider spill prevention and control, optimization of chemical use, public 

education aimed at controlling the introduction of household hazardous materials to the 

sewer system, and water conservation. To the extent that any of these issues have already 

been addressed, the City need only reference the appropriate document in its O&M plan. 

The O&M plan must be revised as new practices are developed. As part of proper 

operation and maintenance, the draft permit requires the City to develop a facility plan 

when the annual average flow exceeds 85% of the average annual design flow of the plant 

(9.46 mgd). This plan requires the City to develop a strategy for remaining in compliance 

with effluent limits in the permit. 

E. Additional Permit Provisions 

In addition to facility-specific requirements, Sections IV, V, and VI of the draft permit contain 

“boilerplate” requirements. Boilerplate is standard regulatory language that applies to all 

Permittees and must be included in NPDES permits. Because the boilerplate requirements are 

based on regulations, they cannot be challenged in the context of an NPDES permit action. The 

boilerplate covers requirements such as monitoring, recording, and reporting requirements, 

compliance responsibilities, and general requirements. 

X. OTHER LEGAL REQUIREMENTS 

A. Endangered Species Act 

Section 7 of the Endangered Species Act requires federal agencies to consult with the National 

Marine Fisheries Service (NMFS) and the U.S. Fish and Wildlife Service (USFWS) to insure 

that any action authorized, funded, or carried out by such agency is not likely to jeopardize the 

continued existence of any endangered or threatened species or result in the destruction or 

adverse modification of designated critical habitat. In order to begin the consultation process the 

EPA requested lists of threatened and endangered species that may be present in the project area 

in phone conversations with the NMFS and USFWS (hereafter referred to as the Services). In a 

phone call on March 26, 2009, Andrea LaTier with the USFWS identified bull trout (Salvelinus 

confluentus) as threatened and indicated that the bald eagle (Haliaeetus leucocephalus) had been 

delisted since preparation of the previous biological evaluation (BE). In a phone call on March 

31, 2009, Dan Guy with NMFS identified Chinook salmon (Oncorhynchus tshawytscha) and 

Puget Sound steelhead trout (O. mykiss) as threatened species that would need to be considered 

in future BE’s for this discharge. 
Permit No.: WA0037168 

City of Puyallup WWTP 19 

The EPA submitted a BE to the Services for the bull trout, Chinook salmon, and steelhead along 

with a request for informal consultation on February 17, 2011. The EPA determined that 

issuance of the NPDES permit was not likely to adversely affect the bull trout, Chinook salmon, 

or steelhead trout. Subsequent to this determination the EPA received letters of nonoccurrence 

from NMFS and USFWS on May 4, 2011and May 13, 2011, respectively. The Services 

requested additional information including an analysis of unregulated pharmaceuticals, PBDE’s, 

and other compounds including an analysis of effects on an additional species, the Southern 

Resident Killer Whale (Orcinus orca). After further consultation with the Services and 

discussions with the Puyallup Tribe of Indians, the EPA prepared a revised BE and requested 

formal consultation with the Services on March 30, 2012. 

USFWS BO 

A biological opinion (BO) from the USFWS dated May 17, 2013 concluded that the issuance of 

the NPDES permit would result in incidental take in the form of harassment of adult and 

subadult bull trout from the Puyallup River core area. The Service concluded that take would 

result from the discharge of treated and disinfected water causing degraded surface water quality. 

The BO stated the continuous source of ammonia and dissolved metals create a plume within 

which bull trout are exposed to elevated temperature, unionized ammonia, dissolved zinc and 

dissolved copper. These degraded water quality conditions are a source of metabolic stress for 

exposed bull trout and are reasonably certain to significantly disrupt normal bull trout behaviors 

(i.e. the ability to successfully feed, move, and shelter). The USFWS BO also stated that 

temperature is the most important abiotic factor influencing metabolic rate in fish. The BO also 

concluded that the level of anticipated take is not likely to result in jeopardy to bull trout. 

The following reasonable and prudent measures (RPMs) were stipulated for the City of Puyallup 

in the BO as necessary and appropriate to minimize the impact of incidental take to bull trout: 

a) The City of Puyallup must provide an annual report to the Service by February 15 

each year of the permit term (2012-2017). The annual report shall compile and 

summarize data and information from Discharge Monitoring Reports submitted by 

the City of Puyallup, and shall include the following: 

(i) A summary of maximum reported effluent discharge concentrations. 

(ii) A summary of any reported effluent limit violations. 

(iii) A summary of any reported emergency and/or non-compliance events, 

including any instances when the WWTP discharged under bypass or 

upset conditions. 

(iv) A summary of surface/receiving water monitoring data. 

(v) Results of annual Whole Effluent Toxicity testing. 

(vi) A summary of any significant revisions to the facility operation and 

maintenance (O&M) plan. 

b) The City of Puyallup shall submit annual reports to the Washington Fish and Wildlife 

Office in Lacey, Washington (Attn: Federal Activities Branch, Division of 

Consultation and Conservation Planning). 
 

Permit No.: WA0037168 

City of Puyallup WWTP 20 

c) In substitute for any part of the annual report, the City of Puyallup may instead 

choose to send an electronic (e-mail) notification directing our office to specific, 

relevant information which is available on-line (e.g., the EPA's Envirofacts web-site). 

Email notification shall be given once annually, on or around February 15 each year 

of the permit term (2012-2017), to the Federal Activities Branch, Division of 

Consultation and Conservation Planning. Please identify Reference No. 13410-2011­

F-0148. 

These RPMs are included in the permit. 

NMFS BO 

A BO from the NMFS dated December 14, 2012 determined that the effects of the proposed 

permit reissuance will harm ESA-listed fish by causing decreased fitness and disorientation, 

leading to increased predation risk. Therefore, incidental take (in the form of harm) of Puget 

Sound Chinook salmon and Puget Sound steelhead is reasonably certain to occur. 

NMFS also anticipates that the effects of the proposed permit will harm some ESA-listed 

fish due to sublethal effects as a result of exposure to low concentrations of contaminants 

and elevated temperatures. However, the BO also concluded that the proposed action is not 

likely to jeopardize the continued existence of Puget Sound Chinook salmon and Puget 

Sound Steelhead, or destroy or adversely modify designated critical habitat for Puget 

Sound Chinook salmon. Finally, the NMFS BO concluded the reissuance of the permit may 

affect, but not likely adversely affect the Southern Resident Killer Whale, the Humpback 

Whale (Megaptera novaeangliae) and Steller sea lions (Eumetopias jubatus). 

The BO stated water temperature is a key factor influencing salmon survival. 

In a meeting between the Puyallup tribe, the USFWS, NMFS and the EPA it was agreed 

discharges must be characterized for temperature by continuous monitoring and a temperature 

monitoring plan. The permit requires continuous monitoring of temperature in both the effluent 

and upstream of the discharge in the Puyallup River and a temperature monitoring plan. 

A second RPM is to require the City to provide NMFS with annual monitoring reports of 

regulated discharge constituent concentrations at the outfall and rapidly inform NMFS of any 

exceedances of permit limits. The permit requires the same reporting requirement to NMFS as it 

does to the USFWS as stated above. 

B. The Magnuson-Stevens Fishery Conservation and Management Act 

The Magnuson-Stevens Fishery Conservation and Management Act (January 21, 1999) (MSA) 

requires the EPA to consult with NOAA National Marine Fisheries Service when a proposed 

discharge has the potential to adversely affect (reduce quality and/or quantity of) Essential Fish 

Habitat. Essential fish habitat (EFH) includes the waters and substrate (sediments, etc.) necessary 

for fish to spawn, breed, feed or grow to maturity. The EFH regulations define an adverse effect 

as any impact which reduces quality or quantity of EFH and may include direct (e.g. 

contamination or physical disruption), indirect (e.g. loss of prey, reduction in species’ fecundity), 

site specific, or habitat-wide impacts, including individual, cumulative, or synergistic 

consequences of actions. 

Based on information provided in the BE and the analysis of effects presented in the ESA 

portion of the BO, the NMFS BO concluded that the proposed action will result in long­
 

Permit No.: WA0037168 

City of Puyallup WWTP 21 

term degradation of EFH. NMFS concluded, “Effects from elevated temperature and 

contaminants would occur in the Puyallup River, affecting water column EFH for the life 

of the structure. Decreased water quality would be found in the mixing zone, covering an 

area approximately 400 feet in length and 50 feet in width throughout the water column, or 

roughly 0.5 acres, reducing rearing, foraging, and spawning success of pink, Chinook, and 

Coho salmon”. 

Section 305(b) of the MSA requires NMFS to recommend measures that may be taken by the 

action agency to conserve EFH. 

C. Certification 

Section 401 of the CWA requires EPA to seek certification from the Tribe that the permit is 

adequate to meet Tribal water quality standards before issuing a final permit. The regulations 

allow for the Tribe to stipulate more stringent conditions in the permit, if the certification cites 

the CWA or Tribal law provisions upon which that condition is based. In addition, the 

regulations (40 CFR 124.53(e)(3)) require a certification to include statements of the extent to 

which each condition of the permit can be made less stringent without violating the requirements 

of Tribal law. Part of the Tribe’s certification is authorization of a mixing zone. The draft 

permit contains a mixing zone based on the provisions in the Puyallup Water Quality Standards. 

If the Tribe authorizes a different mixing zone in its final certification, EPA will recalculate the 

effluent limitations based on the dilution available in the final mixing zone. If the Tribe does not 

certify the mixing zone, EPA will recalculate the permit limitations based on meeting water 

quality standards at the point of discharge. The Tribe stipulated conditions of the draft permit 

and fact sheet as part of the pre-certification. A copy of the Tribe’s pre-certification is provided 

in Appendix F. 

D. Permit Expiration 

This permit will expire five years from the effective date. 

REFERENCES 

City of Puyallup, 1995. Final Effluent Ammonia, Copper and Mercury Evaluation. May 1995. 

EPA 1991. Technical Support Document for Water Quality-based Toxics Control Office of 

Water Enforcement and Permits, Office of Water Regulations and Standards. Washington, D.C., 

March 1991. EPA/505/2-90-001. 

Gray and Osborne, 1996. City of Puyallup Wastewater Facility Plan. June 1996. 

Washington State Department of Ecology, 1993. Puyallup River Total Maximum Daily Load for 

Biochemical Oxygen Demand, Ammonia, and Residual Chlorine. June 1993. 

Washington State Department of Ecology, 1994. Addendum to the 1993 Puyallup River TMDL 

Report. July 1994. 

EPA 1999. Update of Ambient Water Quality Criteria for Ammonia. Office of Water. 

Washington, D.C., December 1999. EPA-822-R-99-014. 
Permit No.: WA0037168 

City of Puyallup WWTP 22 

US Department of Interior, Fish and Wildlife Service, Biological Opinion, City of Puyallup 

Wastewater Treatment Plant, NPDES Permit Reissuance. May 17, 2013. Reference: 13410­

2011-F-0148, 

US Department of Commerce, National Oceanic and Atmospheric Administration, National 

Marine Fisheries Service, Endangered Species Act (ESA) Section 7(a)(2) Biological Opinion and 

Magnuson-Stevens Fishery Conservation and Management Act Essential Fish Habitat (EFH) 

Consultation City of Puyallup Wastewater National Pollution Discharge Elimination System Reissuance. Pierce County, Washington State. December 14, 2012, NMFS Consultation Number: 

2012/01103 
 

Permit No.: WA0037168 

City of Puyallup WWTP 23 

APPENDIX A – CITY OF PUYALLUP FACILITY LOCATION 

Outfall Location 
Permit No.: WA0037168 

City of Puyallup WWTP 24 

Figure A-1: Puyallup Wastewater Treatment Facility Outfall Location 

City of Puyallup WWTP 

Outfall Location 

Figure A-2: Puyallup Wastewater Treatment Facility Aerial Photo 

The Puyallup Wastewater Treatment Plant (WWTP) discharges to the Puyallup River (latitude 

47O 12' 26" N, longitude 122O 19' 11" W) located within the 1873 survey area of the Puyallup 

Reservation. The discharge point is marked on Figures A-1 and A-2 above. 
Permit No.: WA0037168 

City of Puyallup WWTP 25 

APPENDIX B – CITY OF PUYALLUP WASTE STREAMS AND TREATMENT 

PROCESSES 

Effluent Characterization 

In determining the pollutants present in the discharge and their maximum concentrations, EPA 

considered the City’s NPDES application, discharge monitoring reports, and priority pollutant 

scans (collected as part of the City’s pretreatment requirements). Table B-1 lists the maximum 

concentration of pollutants reported by the City as being detected in its discharge. The toxic and 

conventional pollutant categories are defined in the regulations (40 CFR 401.15 and 401.16, 

respectively). The category of nonconventional pollutants includes all pollutants not included in 

either of the other categories. 

Table B-1: Pollutants Detected in Discharge (2003 to 2011) 

Pollutant Type Parameter Maximum Reported 

Concentration 

Conventional1 BOD5, monthly average 8.97 mg/L 

TSS, monthly average 12.41 mg/L 

pH, min - max 6.3 - 7.6 s.u. 

Fecal Coliform Bacteria, 

monthly average 

57 /100 mL 

Toxic2,3 Arsenic, daily maximum 1.38 ug/L 

Cadmium, daily maximum 0.18 ug/L 

Chromium, daily maximum 2.70 ug/L 

Copper1, daily maximum 20.9 ug/L 

Endosulfan II, daily maximum 0.05 ug/L 

Lead1

, daily maximum 1.00 ug/L 

Mercury1, daily maximum 0.02 ug/L 

Nickel, daily maximum 3.00 ug/L 

Selenium, daily maximum 1.10 ug/L 

Silver, daily maximum 0.30 ug/L 

Toluene-d8, daily maximum 97 ug/L 
Permit No.: WA0037168 

City of Puyallup WWTP 26 

Zinc1, daily maximum 72.04 ug/L 

Non-conventional1 Ammonia, daily maximum 

Ammonia, max unionized 

9.25 mg/L 

93 ug/L 

 Temperature 23.60 oC (summer) 

18.40 oC (winter) 

Notes: 

1. Values determined from monthly discharge monitoring reports submitted to EPA (2003-2011). 

2. Values determined from Permittee electronic submittal following initial paper permit 

application. 

3. Metals concentrations are reported as total recoverable metals. 

4. Maximum concentrations do not include statistical outliers. 

5. Unionized ammonia estimated at less than 1% of total ammonia. 

Treatment Processes 

Preliminary treatment: 

- Solids removal (fine screen) 

- Dewatering and landfilling removed solids 

Primary treatment: 

- Primary Clarification 

- Sludge / grit centrifugal separation 

- Grit disposal to landfill 

Secondary treatment: 

- Activated Sludge 

- Secondary Clarification 

- UV Disinfection 

Final Discharge: 

- Design Flow (Maximum Month) - 13.98 mgd 

- Max Monthly Average Flow - 8.81 mgd (DMR data 2003-2010) 

- Average Annual Flow - 4.06 mgd (DMR data 2003-2010) 

Biosolids (sludge) handling: 

- Anaerobic digestion 

- Belt filter press 

- Hauling by private contractor for land application 
Permit No.: WA0037168 

City of Puyallup WWTP 27 

APPENDIX C – BASIS FOR EFFLUENT LIMITATIONS 

I. Statutory and Regulatory Basis for Limits 

Sections 101, 301(b), 304, 308, 401, 402, and 405 of the Clean Water Act (CWA) provide the 

basis for the effluent limitations and other conditions in the draft permit. The EPA evaluates 

discharges with respect to these sections of the CWA and the relevant NPDES regulations to 

determine which conditions to include in the draft permit. 

In general, the EPA first determines which technology-based limits must be incorporated into the 

permit. EPA then evaluates the effluent quality expected to result from these controls, to see if it 

could result in any exceedences of the water quality standards in the receiving water. If 

exceedences could occur, EPA must include water quality-based limits in the permit. The draft 

permit limits reflect whichever requirements (technology-based or water quality-based) are more 

stringent. A table of the limits that EPA is proposing in the draft permit is found in section V of 

this fact sheet. This Appendix describes the technology-based and water quality-based 

evaluations for the City of Puyallup WWTP. 

II. Technology-based Evaluation 

The 1972 CWA required publicly owned treatment works (POTWs) to meet performance-based 

requirements based on available wastewater treatment technology. Under Section 301(b)(1)(B) 

of the CWA, EPA was required to develop a performance level referred to as “secondary 

treatment” for POTWs. 

Based on this statutory requirement, EPA developed secondary treatment regulations which are 

specified in 40 CFR Part 133.102. These technology-based regulations apply to all municipal 

wastewater treatment plants and identify the minimum level of effluent quality attainable by 

secondary treatment in terms of five-day biochemical oxygen demand (BOD5), total suspended 

solids (TSS), and pH. Section IV of this Appendix discusses the details of the evaluation for each 

of these pollutants. 

III. Water Quality-based Evaluation 

In addition to the technology-based limits discussed above, EPA evaluated the discharge to 

determine compliance with Section 301(b)(1)(C) of the CWA. This section requires the 

establishment of limitations in permits necessary to meet water quality standards by July 1, 1977. 

The regulations at 40 CFR 122.44(d)(1) implement section 301(b)(1)(C) of the CWA. These 

regulations require that NPDES permits include limits for all pollutants or parameters which “are 

or may be discharged at a level which will cause, have the reasonable potential to cause, or 

contribute to an excursion above any State water quality standard, including State narrative 

criteria for water quality.” These regulations also apply to Tribal water quality standards. The 

limits must be stringent enough to ensure that water quality standards are met, and must be 

consistent with any available wasteload allocation (WLA). 

In determining whether water quality-based limits are needed and developing those limits when 

necessary, EPA uses the approach outlined below: 

a. Determine the appropriate water quality criteria 

b. Determine whether there is “reasonable potential” to exceed the criteria 
Permit No.: WA0037168 

City of Puyallup WWTP 28 

c. If there is “reasonable potential”, develop a WLA 

d. Develop effluent limitations based on the WLA 

Appendix D provides example calculations to illustrate how these steps are implemented. 

A. Determine Water Quality Criteria 

The first step in developing water quality-based limits is to determine the applicable water 

quality criteria. The applicable criteria are determined based on the beneficial uses of the 

receiving water as identified in section III of the Fact Sheet. For any given pollutant, different 

uses may have different criteria. To protect all beneficial uses, the permit limits are based on the 

most stringent of the water quality criteria applicable to those uses. 

B. Reasonable Potential Evaluation 

To determine if there is “reasonable potential” to cause or contribute to an exceedence of the 

water quality criteria for a given pollutant, EPA compares applicable water quality criteria to the 

maximum projected downstream concentrations for a particular pollutant, Cd. If the projected 

downstream concentration exceeds the criteria, there is “reasonable potential” and a water 

quality-based effluent limit must be included in the permit. 

EPA used the recommendations in Chapter 3 of the Technical Support 

Document for Water Quality-based Toxics Control (TSD) to conduct this “reasonable potential” 

analysis for the City of Puyallup WWTP. 

The maximum projected downstream concentration, Cd, is determined using the following mass 

balance equation. 

Cd = (Ce x Qe) + (Cu x Qu) 

Qd 

where, 

Cd = receiving water concentration downstream of the effluent discharge (at the edge of 

the mixing zone) 

Ce = maximum projected effluent concentration 

Qe = design flow 

Cu = upstream concentration of pollutant 

Qu = upstream flow 

Qd = receiving water flow downstream of the effluent discharge = Qe + Qu 

Substituting the equality: 

D = (Qu + Qe) / Qe 

where, 

D = dilution factor 

the equation becomes: 

Cd = ((Ce - Cu) / D) + Cu 
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City of Puyallup WWTP 29 

For most of the metals of concern, the aquatic life water quality criteria are expressed as 

dissolved. Effluent concentrations are expressed as total recoverable metals. The dissolved metal 

is the concentration of an analyte that will pass through a 0.45 micron filter. Total metal is the 

concentration of an analyte in an unfiltered sample. To account for the differences between total 

effluent concentrations and dissolved criteria, “translators” are used in the reasonable potential 

(and permit limit derivation) equations. Additional discussion on the translators is provided in 

Section IV of this appendix. Pollutant Specific Analysis of this appendix. In order to compare 

metals with criteria expressed as dissolved, the downstream concentration must be converted to 

the dissolved fraction via the translator. 

Cd (dissolved) = Cd (total) * translator 

Paragraphs 1 through 3 below discuss each of the factors used in the mass balance equation to 

calculate Cd. 

1. Effluent Concentration 

The maximum projected effluent concentration (Ce) in the mass balance equation is based on the 

99th percentile, calculated using the statistical approach recommended in the TSD. The 

calculation incorporates a “reasonable potential multiplier” which accounts for uncertainty in the 

data. The multiplier decreases as the number of data points increases and variability of the data 

decreases. Variability is measured by the coefficient of variation (CV) of the data. When there 

are not enough data to reliably determine a CV, the TSD recommends using 0.6 as a default 

value. A partial listing of reasonable potential multipliers can be found in Table 3-1 of the TSD. 

Maximum reported effluent concentrations, CVs, and RPMs used in the reasonable potential 

calculations were based on data collected by the City (DMR data and other monitoring) since 

August 2003. 

2. Upstream (Ambient) Concentration 

The ambient concentration in the mass balance equation is based on a reasonable worst-case 

estimate of the pollutant concentration upstream from the City of Puyallup’s discharge. For 

criteria that are expressed as maxima (for example, copper, ammonia), Ecology guidance 

(Publication Number 92-109) allows for the use of the 90th percentile of critical period ambient 

data as a conservative estimate. For criteria that are expressed as minima (for example, dissolved 

oxygen) the 10th percentile can be used. These percentiles were calculated based on data obtained 

from Ecology’s River and Stream Water Quality Monitoring Program (Station 10A070). 

Because of changes to collection and analytical methods, metals data collected prior to May 

1994 were not included in the evaluation. 

3. Dilution 

Under the Tribe’s water quality standards, dischargers are not authorized to use the entire 

upstream flow for dilution of their effluent. Instead, the standards contain the following 

restrictions on mixing zones for determining compliance with chronic criteria: 
   

   

     

        

                            

                         

 

Permit No.: WA0037168 

City of Puyallup WWTP 30 

The size may be up to 300 feet plus the depth of water over the discharge ports, 100 feet 

upstream, and 25 percent of the width of the river at the 7Q104

 flow; 

The mixing zone may not be more than 25 percent of the volume of the 7Q10 flow. 

The Tribe’s water quality standards require that the acute mixing zone be the same width and 10 

percent of the length of the chronic mixing zone. In addition, the acute mixing zone is limited to 

10 percent of the volume of the chronic mixing zone, or 2.5 percent of the 7Q10 flow. 

The Puyallup mixing zone is depicted below with the maximum dimensions allowed by 

applicable water quality standards. The horizontal length of the diffuser according to the 2007 

Outfall Inspection Report is 50 feet. The river is about 207 ft wide during low flows according to 

a 1995 Cosmopolitan Engineering dilution memo (25% of 207 ft is about 52 ft for the upper 

bound of the mixing zone width). 

Chronic Zone

Acute

Zone

50 ft

300 ft 100 ft

30 ft 10 ft

Puyallup River Flow Direction

NOTES:

Drawing not to scale.

The river is approximately 207 ft wide during low flows (1995 Cosmopolitan Engineering Memo).

The existing diffuser is approximately 50 ft in length (2007 Outfall Inspection Report).

Figure C-1: Mixing Zone 

The 1996 Facility Plan for the treatment plant (Gray and Osborne, 1996) provided the dilution 

factors under these conditions. These factors, which were used in calculating the water-quality 

based effluent limits, are summarized in Table C-1. 

4 The 7Q10 (7-day, 10-year low flow) is the 7-day average low flow that has a 10 percent chance of 

occurring in any given year. The 7Q10 was calculated based on the Log Pearson Type III distribution 

using United States Geological Survey (USGS) data. According to the 1996 Facility Plan, the 7Q10 flow 

for the Puyallup River is 757 cubic feet per second (cfs). 
Permit No.: WA0037168 

City of Puyallup WWTP 31 

Table C-1: Dilution Factors at Critical Mixing Conditions 

Mixing Zone Dilution 

Factor 

River flow 

Conditions 

Percent of River 

Flow Available 

for Effluent 

Mixing 

Effluent Flow 

(mgd)1 

Acute aquatic life 1.9 7Q10 (757 cfs) 2.5% 14.1 

Chronic aquatic 

life 

13.6 7Q10 (757 cfs) 25% 9.7 

Notes: 

1. This effluent flow estimate does not include the former Microchip flow allocation due to their 

cessation of operations, the expiration of their permit, and the complete closure of the associated 

permit file at the request of the new facility owners. The acute effluent flow for Puyallup was 

determined by subtracting 1.88 mgd from 16 mgd (the effluent flow assumption used in the 

previous dilution model per the facility plan). Similarly, the chronic flow was obtained by 

subtracting 1.88 mgd from 11.6 mgd. 

In accordance with the Puyallup Tribe’s water quality standards, only the Tribe may authorize 

mixing zones. In its pre-certification, the Tribe authorized a mixing zone for metals (copper), pH, 

and ammonia. The mixing zone was contingent on monitoring of the receiving water that 

demonstrated attainment of water quality criteria for these parameters. The Tribe has agreed to a 

reduction of the receiving water monitoring frequency, now calling for ambient monitoring once 

per permit cycle. If the Tribe authorizes a different sized mixing zone in its final 401 

certification, EPA will recalculate the reasonable potential and effluent limits based on the 

revised mixing zone. If the Tribe does not authorize a mixing zone in its 401 certification, EPA 

will recalculate the limits based on meeting water quality criteria at the point of discharge. After 

Cd is determined, it is compared to the applicable water quality criterion. If it is greater than the 

criterion, there is “reasonable potential” and a water quality-based effluent limit is developed for 

that parameter. Table D-1 summarizes the “reasonable potential” calculations for the Puyallup 

WWTP discharge. When all effluent data for a particular pollutant were below the detection 

limit (e.g. toluene), EPA assumed that there was no reasonable potential. 

C. Wasteload Allocation Development 

Once EPA has determined that a water quality-based limit is required for a pollutant, the first 

step in developing a permit limit is development of a wasteload allocation (WLA) for the 

pollutant. A WLA is the concentration (or loading) of a pollutant that the Permittee may 

discharge without causing or contributing to an exceedence of water quality standards in the 

receiving water. WLAs for this permit were determined in three ways: based on a mixing zone 

for parameters such as pH and copper; based on a WLA established as part of a preventative 

TMDL such as for ammonia; and based on meeting water quality criteria at “end-of-pipe” for 

fecal coliform. 
 

 

Permit No.: WA0037168 

City of Puyallup WWTP 32 

1. Mixing zone-based WLA 

Where the Tribe authorizes a mixing zone for the discharge, the WLA is calculated as a mass 

balance, based on the available dilution, background concentrations of the pollutant(s), and the 

water quality criteria. The mass balance equation is the same as that used to calculate reasonable 

potential, with the acute or chronic criterion substituted for Cd and the WLA substituted for Ce. 

Because acute aquatic life, chronic aquatic life, and human health criteria apply over different 

time frames and may have different mixing zones, it is not possible to compare them directly to 

determine which criterion results in more stringent limits. For example, the acute criteria are 

applied as a one-hour average and have a smaller mixing zone, while the chronic criteria are 

applied as a four-day average and have a larger mixing zone. 

To allow for comparison, the acute, chronic, and human health WLAs are statistically converted 

to long-term average WLAs. The most stringent long-term average WLA resulting from these 

conversions is used to calculate the permit limits. 

2. TMDL-based WLA 

Where the receiving water quality does not meet water quality standards, the WLA is generally 

based on a TMDL developed by the state or EPA. A TMDL is a determination of the amount of a 

pollutant, from point, nonpoint, and natural background sources, including a margin of safety 

that may be discharged to a water body without causing the water body to exceed the criterion 

for that pollutant. Any loading above this capacity would violate water quality standards. Section 

303(d) of the CWA requires states to develop TMDLs for waterbodies that will not meet water 

quality standards after the imposition of technology-based effluent limitations, to ensure that 

these waters will come into compliance with water quality standards. 

The first step in establishing a TMDL is to determine the assimilative capacity (the loading of 

pollutant that a water body can assimilate without exceeding water quality standards), accounting 

for seasonal variation, if appropriate. The next step is to divide the assimilative capacity into 

allocations for non-point sources (called load allocations), point sources (called WLAs), natural 

background loadings, and a margin of safety to account for any uncertainties. Permit limitations 

are then developed for point sources that are consistent with the WLAs. 

Ecology established a seasonal preventative TMDL for ammonia and BOD5 for the Puyallup 

River basin and tributaries effective May 1 through October 31 (Ecology, 1993 and 1994). The 

terms of this preventative TMDL were used in establishing limits for BOD5 and ammonia in the 

draft permit (see Sections IV.A and IV.D of Appendix C). 

3. “End-of-Pipe” WLA 

In some cases, there is no dilution available. For example, the Tribe may decide not to authorize 

a mixing zone for a particular pollutant, or the receiving water may exceed the criterion for a 

particular pollutant, leaving no “clean” upstream water available for dilution. When there is no 

dilution, the criterion becomes the WLA. 

D. Permit Limit Derivation 

Once the WLA has been developed, EPA applies the statistical permit limit derivation approach 

described in Chapter 5 of the TSD to obtain daily maximum and monthly average permit limits. 

This approach takes into account effluent variability (through the CV), sampling frequency, and 

the difference in time frames between the monthly average and daily maximum limits. 
 

 

Permit No.: WA0037168 

City of Puyallup WWTP 33 

The daily maximum limit is based on the CV of the data and the probability basis, while the 

monthly average limit is dependent on these two variables and the monitoring frequency. As 

recommended in the TSD, EPA used a probability basis of 95 percent for monthly average limit 

calculation and 99 percent for the daily maximum limit calculation. As with the reasonable 

potential calculation, when there were not enough data to calculate a CV, EPA assumed a CV of 

0.6 for both monthly average and daily maximum calculations. Where limits were necessary for 

specific pollutants, the CVs in Table D-1 were used. Appendix D provides an example permit 

limit calculation. 

E. Antidegradation 

In addition to water quality-based limitations for pollutants that could cause or contribute to 

exceedences of numeric or narrative criteria, EPA must consider the Tribe’s antidegradation 

policy. This policy is designed to protect existing water quality when the existing quality is better 

than that required to meet the standard and to prevent water quality from being degraded below 

the standard when existing quality just meets the standard. 

For waters that are at the level of the standard (known as “Tier 1" waters), the antidegradation 

policy requires that water quality standards continue to be met. For waters with better quality 

than the standards (known as “high quality” or “Tier 2" waters), antidegradation requires that no 

lowering of water quality be allowed unless the Tribe finds that allowing lower water quality is 

necessary to accommodate important economic or social development before any lowering of 

water quality is authorized. The Tribe may also designate waters as “Tier 3," in which case no 

lowering of water quality is allowed. The Tribe has no implementation guidance for their 

antidegradation policy. Therefore, the Puyallup River in the vicinity of the City's discharge has 

not been assigned to any tier. However, the limits in the permit ensure that uses are protected and 

water quality standards are met. 

IV. Pollutant-specific Analysis 

This section outlines the basis for each of the effluent limitations in the City of Puyallup’s draft 

permit. 

A. Biochemical Oxygen Demand 

The federal regulations at 40 CFR 133.102(a)(1)-(3) specify technology-based requirements for 

BOD5 for POTWs. These requirements are based on the effluent quality attainable by secondary 

treatment and are equal to the following: 

Monthly Average Concentration: 30 mg/L 

Weekly Average Concentration: 45 mg/L 

Monthly Average Percent Removal: 85% Minimum 

The technology-based concentration and percent removal limits have been incorporated into the 

draft permit for BOD5. 

Under 40 CFR 122.45(f), permits must contain mass-based limitations. The concentration 

requirements may be converted to mass limits by multiplying the technology-based 

concentrations times the design flow (13.98 mgd) and a conversion factor of 8.34. The resulting 
 

 

Permit No.: WA0037168 

City of Puyallup WWTP 34 

monthly and weekly average loadings are 3,498 lbs/day and 5,247 lbs/day respectively. These 

loading limits are less stringent than water quality-based BOD5 loading limits. Therefore, 

loading limits in the draft permit are water quality-based. 

Ecology developed a preventative TMDL for BOD5 and ammonia throughout the Puyallup River 

basin and tributaries effective May 1 through October 31 (Ecology, 1993 and 1994). The TMDL 

also provides an option for dischargers to reduce the WLA for ammonia in order to increase the 

WLA for BOD5, since both parameters together influence dissolved oxygen. For each pound of 

ammonia reduction, the WLA for BOD5 may increase by 13.4 lb/day. The net effect of this 

exchange in the allocation is considered negligible. 

The BOD5 TMDL WLA is applied only during the critical season (May - October). 

The recommended Waste Load Allocations (WLAs) for BOD5 and ammonia from May - 

October given in the preventative TMDL for the Puyallup WWTP are: 

BOD5: 2,085 lbs/day maximum weekly average 

Ammonia: 880 lbs/day maximum daily load 

In their comments on the previous draft permit, the City of Puyallup requested the following 

BOD5 loading limits: 

Average monthly = 2,179 lbs/day 

Average weekly = 3,268 lbs/day 

The requested increase in the BOD5 average weekly WLA is equal to 1,183 lbs/day, i.e.: 3,268 - 

2,085 = 1,183 lbs/day. With the increase in the average weekly BOD5 loading limit, the average 

monthly BOD5 loading limit increases to 2,179 lbs/day, based on an average weekly:average 

monthly factor of 1.5 (i.e. 3,268 ÷ 1.5 = 2,179 lbs/day.) The revised average monthly BOD5 

loading limit corresponds to 85% removal of the BOD5 loading design criteria for the treatment 

plant (of 14,525 lbs/day), i.e. 14,525 x 0.15 = 2,179 lbs/day. The basis for the requested trade 

may be seen in the influent BOD5 loading criterion for the treatment plant, which is 14,525 

lbs/day. Assuming 85% removal, the average monthly mass-based effluent limit for BOD5 is 

2,179 lbs/day (i.e. 14,525 x 0.15 = 2,179 lbs/day). Assuming an average weekly:average monthly 

ratio of 1.5, the resulting average weekly mass-based effluent limit is 3,268 lbs/day. These limits 

are more stringent than mass-based limits calculated from the effluent concentration limits and 

the facility design flow (of 13.98 MGD). 

Table C-2 outlines the BOD5 limits in the draft permit. The draft limits are the same as the limits 

in the previous permit. 

Table C-2: BOD5 Draft Limits

 Concentration 

(mg/L) 

Loading (lb/day) Minimum Percent 

Removal (%) 

Average Monthly 30 2,179 85 

Average Weekly 45 3,268 --
Permit No.: WA0037168 

City of Puyallup WWTP 35 

B. Total Suspended Solids 

The federal regulations at 40 CFR 133.102(a)(1)-(3) specify technology-based requirements for 

TSS for POTWs. These requirements are based on the effluent quality attainable by secondary 

treatment and are equal to the following: 

Monthly Average Concentration: 30 mg/L 

Weekly Average Concentration: 45 mg/L 

Monthly Average Percent Removal: 85% Minimum 

These technology-based concentration and percent removal limits have been incorporated into 

the TSS draft permit limits. 

The concentration requirements may be converted to mass limits by multiplying the 

concentrations times the design flow (13.98 mgd) and a conversion factor of 8.34. The resulting 

monthly and weekly average loadings are 3,498 lbs/day and 5,247 lbs/day respectively. 

However, the previous permit established the TSS mass-based limits on 85% removal of the TSS 

design load. The TSS design loading of the upgraded treatment plant is 15,550 lbs/day. 

Assuming 85 percent removal of the influent TSS, and applying a 1.5 factor to convert from the 

maximum monthly loading to the maximum weekly loading, results in the following TSS massbased limits: 

Maximum Monthly Average 2,333 lbs/day 

Maximum Weekly Average 3,499 lbs/day 

These limits have been incorporated into the draft permit. Table C-3 outlines the TSS limits in 

the draft permit. 

Table C-3: TSS Draft Limits 

Concentration 

(mg/L) 

Loading (lb/day) Minimum Percent 

Removal (%) 

Average Monthly 30 2,333 85 

Average Weekly 45 3,499 --

C. Fecal Coliform Bacteria 

The Puyallup Tribe’s water quality standards state that the geometric mean of fecal coliform 

bacteria may not exceed 100 colonies/100 ml and no more than 10 percent of the samples used to 

calculate the mean may exceed 200 colonies/100 ml. Fecal coliform counts in the Puyallup 

River upstream of the City’s discharge sometimes exceed these criteria. When the upstream 

water quality exceeds the criteria, there is no “clean” water to mix with the discharge to enable 

the water to meet the criterion downstream. As a result, the discharge must meet the criteria at 

the point of discharge. The criteria have been incorporated directly into the draft permit as a 
Permit No.: WA0037168 

City of Puyallup WWTP 36 

monthly average limit and a requirement that no more than 10 percent of samples exceed 

200/100 ml. 

D. Ammonia 

Low concentrations of ammonia can be toxic to freshwater fish, particularly salmonids. Unionized ammonia (NH3) is the principal toxic form of ammonia. 

The ammonium ion (NH4+) is much less toxic. The relative percentages of these two forms of 

ammonia in the water vary as the temperature and pH vary. As the pH and temperature increase, 

the percentage of ammonia that is in the un-ionized form increases, causing increased toxicity. 

Because the toxicity of ammonia is dependent upon pH and temperature, the criteria are also pH 

and temperature dependent (EPA, 1999). In keeping with the previous permit, seasonal criteria 

and concentration limits were developed for ammonia. The receiving water pH and temperature 

and corresponding ammonia criteria are presented in Table C-4. Data for the Puyallup River 

were from Ecology’s River and Stream Water Quality Monitoring Program (Station 10A070) 

and data collected as part of the TMDL report (Ecology, 1993). Reasonable worst-case pH and 

temperature conditions were calculated from the 90th percentile of samples obtained from 1990 

through 2007. Although earlier data exist for the monitoring location (from 1960 to 1981), 

previous analysis of the data indicated that the pH conditions of the river have changed. 

Therefore, to represent the existing river conditions to which the treatment plant discharges, only 

the more recent years of data were used. 

Table C-4: Unionized Ammonia Criteria 

Time Period 

Receiving Water Conditions1 

Acute Criteria 

(mg/L) 

Chronic 

Criteria 

pH (mg/L) Temperature 

(°C) 

November 1 – 

April 30 7.67 9.0 0.085 0.019 

May 1 – 

October 31 

7.70 15.9 0.140 0.031 

Note: 

1. Based on the 90th percentile of the receiving water data collected from 1990 to 2007. Criteria 

were determined using the Puyallup Tribe’s water quality standards. 

Although it is the un-ionized form that is toxic, the criteria are expressed as total ammonia. As 

effluent mixes with receiving water, the temperature and pH change, making it difficult to 

predict how much of the total ammonia in the discharge will convert to the un-ionized form. 

Therefore, the limits in the draft permit are expressed as total ammonia, not un-ionized ammonia. 

Using the statistical permit derivation method in the TSD, EPA calculated seasonal daily 

maximum and monthly average concentration limits. Mass-based loadings corresponding to 

these limits were calculated based on the design flow of 13.98 mgd. 

In addition to potential toxicity, ammonia can contribute to dissolved oxygen depression. 

Ecology developed a preventative TMDL for ammonia and BOD5 to address dissolved oxygen 
 

Permit No.: WA0037168 

City of Puyallup WWTP 37 

concerns in the Puyallup River. The preventative TMDL established a WLA for ammonia for the 

City’s WWTP (880 lb/day) and allowed conversion of ammonia loading into BOD5. Recall that 

the requested increase in the BOD5 average weekly WLA was equal to 1,183 lbs/day, and that 

for each pound of ammonia reduction the WLA for BOD5 was allowed to increase by 13.4 

lb/day. Based on the conditions of the preventative TMDL then, the ammonia maximum daily 

WLA decreases to 792 lbs/day, i.e.: 880 - (1,183 ÷ 13.4) = 792 lbs/day. This decreased loading 

was set as the effluent limit for ammonia from May 1 through October 31. This limitation was 

also used in the previous permit. Table C-5 summarizes the ammonia limitations in the draft 

permit. 

Table C-5: Total Ammonia Limits 

Daily Maximum Monthly Average 

Time Period Concentration 

(mg/L) 

Loading (lb/day) Concentration 

(mg/L) 

Loading (lb/day) 

November 1 – 

April 301 

16.1 2,622 5.4 793 

May 1 – 

October 312 

12.0 792 4.2 490 

Notes: 

1. Water quality-based effluent limits (see Table D-1 in Appendix D). 

2. MDL loading limit based on preventative TMDL. 

E. Metals 

In the Puyallup Tribe’s water quality standards, the most stringent criteria applicable to the 

permit for metals other than arsenic are the criteria for the protection of aquatic life. For arsenic, 

the most stringent criterion is for protection of human health. This section discusses the 

calculation of the metals criteria and the conversion of these criteria to limits in the draft permit. 

1. Criteria calculation 

In evaluating whether limits for specific metals were appropriate and in calculating the necessary 

limits, EPA considered only metals that were detected in the effluent. Table C-6 lists the most 

stringent criteria for the metals of concern. Except for mercury, the Tribe's aquatic life criteria 

for these metals are expressed as a function of hardness, measured in milligrams per liter calcium 

carbonate (mg/L CaCO3). As the hardness of the receiving water increases, the toxicity 

decreases, and the numerical value of the criteria increases. 

The hardness-dependent metals criteria were calculated based on the combination of historical 

receiving water hardness and effluent hardness data. The same hardness values used in the 

previous permit cycle were used to calculate effluent limits for the new permit. A hardness value 

of 43.5 mg/L as CaCO3 was used as the projected hardness at the edge of the acute mixing zone. 

A hardness value of 25.50 mg/L CaCO3 was used as the projected hardness at the edge of the 

chronic mixing zone. Receiving water hardness data is provided in Appendix E. 
Permit No.: WA0037168 

City of Puyallup WWTP 38 

In addition to the calculation for hardness, the Tribe’s criteria include a “conversion factor” to 

convert from total recoverable to dissolved criteria. Total recoverable metals analysis measures 

both the particulate and the dissolved fraction of the metal. Conversion factors address the 

relationship between the total amount of metal in the water column (total recoverable metal) and 

the fraction of that metal that causes toxicity (bioavailable metal). Conversion factors are 

included in Table C-6. 

Table C-6: Metals Criteria for the Puyallup River 

Parameter 

Conversion 

Factor Criterion Formula 

Criterion (ug/L) 

Dissolved Total 

Cadmium 

Acute 

Chronic 

0.865 

0.865 

exp(1.128*(ln[hardness]) - 3.828) 

exp(0.7852*(ln[hardness]) - 3.49) 

1.33 

0.34 

--

--

Chromium 

Acute 

Chronic 

--

--

exp(0.8190*ln[hardness] + 3.688) 

exp(0.8190*ln[hardness] + 1.561) 

878.21 

67.59 

--

--

Copper 

Acute 

Chronic 

0.862 

0.862 

exp(0.9422*ln[hardness] - 1.464) 

exp(0.8545*ln[hardness] - 1.465) 

6.97 

3.17 

--

--

Lead 

Acute 

Chronic 

0.687 

0.687 

exp(1.273*ln[hardness] - 1.460) 

exp(1.273*ln[hardness] - 4.705) 

19.44 

0.38 

--

--

Mercury 

Acute 

Chronic 

N/A 1 

N/A 1 

N/A 1 

N/A 1 

--

--

2.4 

0.012 

Nickel 

Acute 

Chronic 

0.950 

0.950 

exp(0.8460*ln[hardness] + 3.3612) 

exp(0.8460*ln[hardness] + 1.1645) 

666.25 

47.14 

--

--

Selenium 

Acute 

Chronic 

--

--

20.0 

5.0 

20.0 

5.0 

--

--

Silver 

Acute 

Chronic 

0.531 

--

exp(1.72*ln[hardness] - 6.52) 

--

0.5149 

--

--

--

Zinc 

Acute 

Chronic 

0.891 

0.891 

exp(0.8473*ln[hardness] + 0.8604) 

exp(0.8473*ln[hardness] + 0.7614) 

51.50 

29.67 

--

-- 1 The acute and chronic criteria for mercury are not hardness-dependent. Hardness, from RTCs last permit cycle (mg/L, CaCO3): 43.5 25.50 

acute chronic 

Based on data submitted by the City, the reasonable potential analysis indicated that copper 

shows reasonable potential to contribute to excursions above criteria at the edge of the chronic 

mixing zone and the acute mixing zone. Therefore, the draft permit contains limits for this metal. 

The 2003 permit included mercury limits of 0.052 ug/L (average monthly) and 0.069 ug/L 

(maximum daily). The facility remained in compliance with these levels during the most recent 

permit cycle. A reasonable potential evaluation was conducted using recent data provided by the 

City. The evaluation indicated that mercury in the effluent does not have a reasonable potential 

to exceed the applicable water quality criteria. A similar situation exists for lead and zinc. In 

such cases, new effluent limits typically reflect the effluent limits established in the previous 

permit to avoid backsliding. However, there were questions about the validity of some of the 

metals data upon which the prior metals limits were based. EPA determined that there is now a 

sufficiently large data set obtained using clean sampling methods upon which to base reasonable 

potential without having to use the questionable data. The results of the current reasonable 

potential calculations are consequently being used to set effluent limits. These changes are 

consistent with language in Clean Water Act section 303(d)(4)(B) regarding the revision of 

certain effluent limits. 

2. Permit Limit Calculation 

Although the metals criteria are based on dissolved metal, 40 CFR 122.45(c) requires that metal 

limits be based on total recoverable metals. Changes in water chemistry as the effluent and 

receiving water mix could cause some of the particulate metal in the effluent to dissolve. To 
Permit No.: WA0037168 

City of Puyallup WWTP 39 

account for the difference between total recoverable effluent concentrations and dissolved 

criteria, “translators” are used in calculating effluent limits. “Translators” are based on the 

fraction of the total recoverable metals that is predicted to be in the dissolved form in the 

receiving water. The dissolved wasteload allocation is divided by the translator, resulting in a 

total recoverable value. Translators can either be site specific numbers or default numbers. 

Because there are no site-specific translators for the Puyallup River, EPA guidance allows for the 

use of the criteria conversion factors listed in Table C-6 as the translators (EPA 1996). In cases 

where there were no tribal metals conversion factors (e.g. arsenic, and mercury), factors were 

obtained from Table 1 of EPA’s metals guidance document (EPA 1996). 

Table C-7 summarizes the limits for metals in the draft permit. Mass-based limits were 

calculated by multiplying the concentration (in mg/L) by the treatment plant design flow (13.98 

mgd) and a conversion factor of 8.34. Example calculations for the ammonia and copper effluent 

limits are provided in Appendix D. 

Table C-7: Metals Limits (total recoverable) for the City of Puyallup Permit 

Parameter Monthly Average Daily Maximum 

Copper, Total Recoverable 

ug/L 

lbs/day 

8.5 

0.99 

13.7 

1.60 

F. pH 

Under 40 CFR 133.102 effluent pH must be within the range of 6.0 to 9.0 standard units for 

POTWs. In addition, the Tribe’s water quality standards for protection of aquatic life require that 

ambient pH be in the range of 6.5 to 8.5 standard units. 

A model of pH mixing was used to determine the effluent pH values that would result in meeting 

the criteria at the edge of the mixing zone (Table C-8). Mixing zone boundary pH is a function of 

effluent and ambient pH, flow, alkalinity (buffering capacity), and temperature. The worst-case 

scenario is a warm, highly buffered effluent being discharged into a warm, poorly buffered 

stream. 
Permit No.: WA0037168 

City of Puyallup WWTP 40 

Table C-8: Determination of pH Limits 

Calculation of pH of a mixture of two flows. Based on the 

procedure in EPA's DESCON program (EPA, 1988. Technical 

Guidance on Supplementary Stream Design Conditions for Steady 

State Modeling. USEPA Office of Water, Washington D.C.) 

Based on Lotus File PHMIX2.WK1 Revised 19-Oct-93 

INPUT 

1. DILUTION FACTOR AT MIXING ZONE BOUNDARY 1.900 

2. UPSTREAM/BACKGROUND CHARACTERISTICS

 Temperature (deg C): 15.90

 pH: 7.70

 A kalinity (mg CaCO3/L): 20.10 

3. EFFLUENT CHARACTERISTICS

 Temperature (deg C): 23.18

 pH: 6.42

 A kalinity (mg CaCO3/L): 110.60 

OUTPUT 

1. IONIZATION CONSTANTS

 Upstream/Background pKa: 6.41

 Effluent pKa: 6.36 

2. IONIZATION FRACTIONS

 Upstream/Background Ionization Fraction: 0.95

 Effluent Ionization Fraction: 0.53 

3. TOTAL INORGANIC CARBON

 Upstream/Background Total Inorganic Carbon (mg CaCO3/L): 21.14

 Effluent Total Inorganic Carbon (mg CaCO3/L): 208.17 

4. CONDITIONS AT MIXING ZONE BOUNDARY

 Temperature (deg C): 19.73

 A kalinity (mg CaCO3/L): 67.73

 Total Inorganic Carbon (mg CaCO3/L): 119.57

 pKa: 6.38

 pH at Mixing Zone Boundary: 6.50 

The effluent temperature used in the model is the 99th percentile of DMR temperature data from 

2003 through 2011. The effluent alkalinity value represents the 95th percentile of WET testing 

data (obtained December 2003, November 2004, November 2005, and November 2006). The 

95th percentile effluent alkalinity value was used in the previous permit mixed hardness 

calculation. The upstream temperature value represents the 90th percentile of data from Ecology 

river monitoring station 10A070 from 1990 through 2007, plus additional temperature data 

supplied separately by the Puyallup Tribe for years 2004 and 2007. The upstream alkalinity was 

the 10th percentile of available 10A070 river monitoring data (2006 through 2007). The 

upstream pH range represents the 10th and 90th percentile of 10A070 data from 1990 through 

2007. 
Permit No.: WA0037168 

City of Puyallup WWTP 41 

The model indicated that an effluent pH within the range of 6.4 to 9.0 is required to achieve a pH 

at the edge of the mixing zone that complies with the Tribe's water quality standards. Therefore, 

the draft permit contains a pH range of 6.4 to 9.0. 

G. Temperature 

EPA calculated the reasonable potential for the discharge to exceed the Puyallup Tribe’s 

freshwater temperature criteria at the edge of the chronic mixing zone during critical conditions. 

According to the Puyallup water quality standards: 

(iv) Temperature shall not exceed 18.0°C (freshwater) or 16.0°C (marine water) due to human 

activities. When natural conditions exceed 18.0°C (freshwater) and 16.0°C (marine water), no 

temperature increase will be allowed which will raise the receiving water temperature by greater 

than 0.3°C. Temperature reasonable potential was evaluated for this permit using a statistical 

representation of existing temperature data, including data provided by the Puyallup Tribe. If 

there is sufficient ambient temperature monitoring data that indicates the need for the Puyallup 

River to be listed as Category 5 “impaired” waters under Clean Water Act section 303(d), a 

TMDL process would be used to determine “natural” temperature conditions in the river. 

Currently, the most serious temperature listing for the Puyallup River is Category 2, which 

identifies waters where there is some evidence of a water quality problem, but not enough to 

require a TMDL at this time. 

Incremental temperature increases resulting from point source activities shall not, at any time, 

exceed t=28/(T+7) (freshwater) or t=12/(T-2) (marine water). Incremental temperature increases 

resulting from nonpoint source activities shall not exceed 2.8 °C. 

For purposes hereof, “t” represents the maximum permissible temperature increase measured at a 

mixing zone boundary; and "T" represents the background temperature as measured at a point or 

points unaffected by the discharge and representative of the highest ambient water temperature in 

the vicinity of the discharge. 

Therefore: t=28/(T+7) (freshwater) 

t=28/(15.9+7)= 1.22 

And, 1.22<2.8 

Therefore, the maximum permissible temperature increase at a mixing zone boundary is 1.22 

degrees C. 

What is the temperature at the edge of the chronic mixing zone? 

Inputs: 

1.) chronic dilution factor = 13.6 

2.) Max Effluent Temperature = 23.6 

3.) 7DADMax Ambient Temperature (T) (Upstream Background 90th percentile) 

= 15.9 
Permit No.: WA0037168 

City of Puyallup WWTP 42 

Output: 

= (23.6+(13.6-1)*15.9)/13.6 = 16.5 degrees C 

What is the temperature increase at the chronic mixing zone boundary? 

= 16.5 - 15.9 = 0.6 degrees C 

Conclusion: 

The max permissible temperature increase at a mixing zone boundary is 1.22 degrees C. 

0.6 degrees C < 1.22 degrees C
 

Therefore, there is no reasonable potential for temperature.
 

IV. References
 

EPA, 1999. 1999 Update of Ambient Water Quality Criteria for Ammonia. EPA822-R-99-014, December 1999. 

EPA, 1996. The Metals Translator: Guidance for Calculating A Total Recoverable Permit Limit 

From A Dissolved Criterion. EPA 823-B-96-007, June 1996. 
Permit No.: WA0037168 

City of Puyallup WWTP 43 

APPENDIX D – EXAMPLE EFFLUENT LIMIT CALCULATIONS 

This appendix steps through an example calculation of permit limits for ammonia during the time 

period of November through April. Calculations for additional parameters, such as copper, are 

also provided. 

Step 1: Determine the appropriate criteria 

A. Determine the uses 

The Puyallup River is protected by the Puyallup Tribe for the following uses: domestic, 

industrial and agricultural water supply, stock watering, fish and shellfish (including salmonids, 

crustaceans and other shellfish, and other fish), wildlife habitat, ceremonial and religious water 

use, commerce, navigation, and primary and secondary recreation. 

B. Determine the most stringent criterion to protect the uses 

The most stringent criterion associated with these uses is for protection of salmonid spawning. 

The criteria for ammonia are based on temperature and pH (see Appendix C, section IV.D). 

Using reasonable assumptions for pH and temperature results in the following seasonal acute 

criterion (CMC) and chronic criterion (CCC): 

Table D-1: Unionized Ammonia Criteria 

Time Period 

Receiving Water Conditions1 

Acute Criteria 

(ug/L) 

Chronic 

Criteria 

pH (ug/L) Temperature 

(°C) 

November to 

April 7.67 9.0 85 19 

May to October 7.70 15.9 140 31 

Note: 

1

 Based on the 90th percentile of the receiving water data collected from 1990 to 2007. 

Step 2: Determine whether there is “reasonable potential” to exceed the criteria 

2A. Determine the “reasonable potential” multiplier 

The “reasonable potential” multiplier is based on the CV of the data and the number of data 

points. The data used are DMR results from August 2003 through December 2011, there are 50 

data points for this period during the months of November through April. The calculated CV is 

1.754. (See Appendix E for effluent monitoring results.) 

Using the equations in Section 3.3.2. of the TSD, the reasonable potential multiplier (RPM) is 

calculated as follows: 
Permit No.: WA0037168 

City of Puyallup WWTP 44 

pn = (1 - confidence level)1/n 

where, 

pn = the percentile represented by the highest concentration 

n = the number of samples 

pn = (1-0.99)1/30 

pn = 0.86 

This means that the largest value in the data set is greater than the 86th percentile. 

Next, the ratio of the 99th percentile to the 86th percentile is calculated, based on the equation: 

Cp = exp(zσ - 0.5σ2) 

where, 

σ2

 = ln(CV2 +1) 

CV = coefficient of variation (= 1.754) 

σ2= 1.405 

z = normal distribution value 

= 2.326 for the 99th percentile 

= 1.080 for the 86th percentile 

C99 = exp(2.326 * 1.185 - 0.5 * 1.405) 

= 7.80 

C86 = exp(1.080 * 1.185 - 0.5 * 1.405) 

= 1.78 

RPM = C99/C86 

= 7.80/1.78 

RPM = 4.38 

2B. Calculate the concentration of the pollutant at the edge of the mixing zone 
Permit No.: WA0037168 

City of Puyallup WWTP 45 

There is reasonable potential to exceed criteria if the maximum projected concentration of the 

pollutant at the edge of the mixing zone exceeds the criterion. The maximum projected 

concentration is calculated from the following equation: 

Cd = (Ce – Cu)/D + Cu 

where, 

Cd = receiving water concentration at the edge of the mixing zone 

Ce = maximum projected effluent concentration 

= maximum reported effluent concentration * reasonable potential multiplier 

((6.83*1000*0.01) * 4.38 = 299.2 ug/L unionized ammonia) 

Cu = upstream concentration of unionized ammonia (0.4 ug/L) 

D = dilution factor (1.9 for acute, 13.6 for chronic) 

Acute mixing zone concentration, 

Cd = (299.2 - 0.4)/1.9 + 0.4 

Cd = 157.6 ug/L (> 85 ug/L) 

Chronic mixing zone concentration, 

Cd = (299.2 - 0.4)/13.6 +0.4 

Cd = 22.37 ug/L (> 19 ug/L) 

The concentrations at the edges of the acute and chronic mixing zones are greater than the 

criteria, therefore a limit must be included in the permit. 

Step 3: Calculate the wasteload allocations 

Wasteload allocations (WLAs) are calculated using the same mass balance equation used to 

calculate the concentration of the pollutant at the edge of the mixing zone. 

However, Cd becomes the acute or chronic criterion and Ce is replaced by the acute or chronic 

WLA. The equation is rearranged to solve for the WLA, becoming: 

WLAa = D*(CMC - Cu) + Cu 

For the acute criterion, 

WLAa = 1.9 * (85 - 0.4) + 0.4 

WLAa = 161.14 ug/L 
Permit No.: WA0037168 

City of Puyallup WWTP 46 

For the chronic criterion, 

WLAc = 13.6 * (19- 0.4) + 0.4 

WLAc = 253.36 ug/L 

The WLAs are converted to long-term average concentrations, using the following equations 

from EPA’s Technical Support Document for Water Quality-based Toxics 

Control (TSD): 

LTAa = WLAa * exp[0.5σ2 - zσ] 

LTAc = WLAc * exp[0.5σ42 - zσ4] 

where, 

σ42 = ln(CV2/4 + 1) = 0.570 

z = 2.326 for 99th percentile probability basis 

LTAa = 161.14* exp[0.5 * 1.405 - 2.326 * 1.185] 

LTAa = 20.67 ug/L (November through April) 

LTAc = 253.36 * exp[0.5 * 0.570 - 2.326 * 0.755] 

LTAc = 58.19 ug/L (November through April) 

The LTAs are compared and the more stringent is used to develop the daily maximum and 

monthly average permit limits. In this case, the acute LTA is more stringent. 

Step 4: Derive the maximum daily (MDL) and average monthly (AML) permit limits 

Example calculations for Step 4 are provided for the November through April time period. Using 

the TSD equations, the MDL and AML permit limits are calculated as follows: 

MDL = LTA * exp[zσ-0.5σ2] 

where: 

z = 2.326 for 99th percentile probability basis 

MDL= 20.67 * exp[2.326 * 1.185 - 0.5 * 1.405] 

MDL= 161.18 ug/L 

AML= LTA * exp[zσn - 0.5σn2] 

where: 
Permit No.: WA0037168 

City of Puyallup WWTP 47 

σn2 = ln(CV2/n + 1) = ln((1.7542)/4 + 1) = 0.570 

z = 1.645 for 95th percentile probability basis 

n = number of samples 

AML= 20.67 * exp[1.645 * 0.755 - 0.5 * 0.570] 

AML= 53.82 ug/L 

These MDL and AML are expressed as unionized ammonia. These values must be converted 

back to total ammonia to reflect limits that are consistent with the ammonia monitoring required 

at the facility. Based on receiving water information including pH and temperature, the 

percentage of total ammonia in the unionized form is approximately 1%. The conversion to mg/L 

total ammonia is as follows: 

AML = 53.82 ug/L / 0.01 = 16,117.54 ug/L / 1000 = 16.12 mg/L total ammonia 

MDL = 161.18 ug/L / 0.01 = 5,382.07 ug/L / 1000 = 5.38 mg/L total ammonia 

The mass-based limits corresponding to these concentrations are calculated based on the 

concentration limits, the wastewater treatment plant design flow of 13.98 mgd, and a conversion 

factor of 8.34. 

From November to April: 

Mass-based MDL = 16.12 mg/L x 19.5 mgd x 8.34 = 2621.6 lbs/day 

Mass-based AML = 5.38 mg/L x 19.5 mgd x 8.34 = 874.9 lbs/day 

The MDLs and AMLs calculated in this manner must be compared to existing limits to ensure 

the more stringent limits are selected for the new permit. The existing ammonia limits for 

November through April are an AML of 6.8 mg/L and 793 lbs/day, and an MDL of 17.6 mg/L 

and 2,862 lbs/day. The ammonia limits below will be used in the new permit for the months of 

November through April. Note that the maximum day mass-based limits for November to April 

is based on the winter maximum day design flow of 19.5 MGD. This design criterion was used 

in the previous permit cycle as requested by the Permittee. 

AML = 5.4 mg/L; 793 lbs/day 

MDL = 16.1 mg/L; 2,622 lbs/day 

Ammonia limits were not calculated in a similar fashion for May to October as a reasonable 

potential was not found on the basis of recent effluent data. However, as discussed in Appendix 

C Section IV.D, mass-based effluent limits for ammonia were still assigned for the period of 

May to October based on preventative TMDL waste load allocations and the prohibition on 

backsliding. 

Table D-2 summarizes the reasonable potential and effluent limit calculations for pollutants 

found in the treatment plant effluent. A reasonable potential to exceed water quality standards 
Permit No.: WA0037168 

City of Puyallup WWTP 48 

was found for ammonia and copper. The resulting limits for ammonia and copper were 

compared to effluent limits in the previous permit, with the more stringent limit being selected 

for the new permit. Arsenic may also have been found to pose a reasonable potential to exceed 

human health criteria for the consumption of water and aquatic organisms (fish). A special 

course of arsenic monitoring has therefore been included in the draft permit and is discussed in 

Section IX.B. of this fact sheet. 
 

 

Permit No.: WA0037168 

City of Puyallup WWTP 49 

Table D-2. Reasonable Potential Calculations and Limits 

Reasonable Potential Calculation 

Water Body Type Freshwater Facility: 

Dilution Factors: Acute Chronic 

Puyallup 

Aquatic Life 1.9 13.6 

Human Health Carcinogenic 13.6 

Human Health Non-Carcinogenic 13.6 

Unionized NH3 

Nov-April May-Oct Total As AMMONIA, Criteria as Total NH3 AMMONIA, Criteria as Total NH4 ARSENIC (dissolved) 7440382 2M

ARSENIC (inorganic)CADMIUM - 7440439 4M Hardness dependentCHROMIUM(TRI) -16065831 5M Hardness dependentCOPPER - 744058 6M Hardness dependentENDOSULFAN a 959988 11P, b 33213659 12P LEAD - 7439921 7M Dependenton hardnessMERCURY 7439976 8M NICKEL - 7440020 9M -Dependent on hardnessSELENIUM 7782492 10M SILVER - 7740224 11Mdependent on hardness. ZINC- 7440666 13M hardness dependent 

50 52 26 26 26 23 60 6 102 100 26 26 26 73 

1.75 1.14 0.23 0.23 0.47 0.67 0.548 0.6 0.52 2.34 0.25 0.67 0.48 0.317 

68 66 1.38 0.18 2.7 81 0.05 1 0.02 3 1.1 0.3 72.04 

1.1 0.00265 2.4 

0.4 0.4 1.03 0.02 0.26 0.94 0 0.05 0.008 0.52 0 0.02 2.66 

0 0 0.002 0.415 

Acute 85 140 360 - 1.326639 878.215 6.974045 0.22 19.43943 2.4 666.248 20 0.51487 51.5035 

Chronic 19 31 190 - 0.33554 67.5912 3.170695 0.056 0.383819 0.012 47.1403 5 - 29.6696 

- - - 0.018 - - - 0.93 - 0.14 610 - - -

Acute - - 1 - 0.865 - 0.862 - 0.687 0.95 - 0.531 0.891 

Chronic - - 1 - 0.865 - 0.862 - 0.687 - 0.95 - - 0.891 

N N Y Y N N N N N N N N N N 

Aquatic Life Criteria, 

ug/L 

Carcinogen? 

WQ Criteria for Protection of 

Human Health, ug/L 

Metal Criteria 

Translator, decimal 

Water Quality Criteria 

Receiving Water Data 90th Percentile Conc., ug/L 

Geo Mean, ug/L 

Coeff of Variation (Cv) 

Calculated 50th percentile Effluent 

Conc. (when n>10) 

Pollutant, CAS No. & 

NPDES Application Ref. No. 

Effluent Data 

# of Samples (n) 

Effluent Concentration, ug/L (Max. 

or 99th Percentile) 

Aquatic Life Reasonable Potential 

s 1.184 0.913 0.227 0.447 0.609 0.512 0.555 0.489 1.367 0.246 0.609 0.455 0.309 

Pn 0.912 0.915 0.838 0.838 0.819 0.926 0.464 0.956 0.955 0.838 0.838 0.838 0.939 

Multiplier 3.16 2.38 1.36 1.82 2.37 1.57 3.82 1.36 2.37 1.39 2.26 1.84 1.27 

Max concentration (ug/L) at edge of... Acute 

Chronic 

114 

16 

83 

12 

1.473 

1.092 

0.159 

0.039 

3.489 

0.711 

58.089 

8.924 

0.100 

0.014 

0.514 

0.115 

0.029 

0.011 

2.333 

0.773 

1.310 

0.183 

0.164 

0.059 

44.274 

8.474 

Reasonable Potential? Limit Required? YES NO NO NO NO YES NO NO NO NO NO NO NO 
 

 

 

Permit No.: WA0037168 

City of Puyallup WWTP 50 

Copper Effluent Limit Calculation 

Criteria Calculations per Tribal Standards 

INPUTS::: acute criteria = (0.862)*(EXP(0.9422*LN(acute hardness)-1.464)) = 6.97 ug/L dissolved Cu 

acute hardness = 43.5 mg/L CaCO3 

acute dilution = 1.9 

chronic cr teria = (0.862)*(EXP(0.8545*LN(chronic hardness)-1.465)) = 3.17 ug/L dissolved Cu 

chronic hardness = 25.5 mg/L CaCO3 

chronic dilution = 13.9 

background Cu = 0.94 <-- ug/L dissolved Copper (dissolved Cu data from upstream long-term monitoring station #10A070). 

WLAa/WLAc WLAa = (acute cr terion *acute DF)-(background Cu *(acute DF-1)) = 12.40 

WLAb = (chronic cr ter on *chron c DF)-(background Cu *(chron c DF-1)) = 31.95 

TLAa/TLAc LTAa = (WLAa)*(EXP(0.5σ^2 - zσ)) = 4.29

σ^2 = LN(CV^2 + 1) = 0.263 

z = 2.326 

CV = 0.548 

<-- Derived from last three years of DMRs. 

LTAc = (WLAb)*(EXP(0.5*σ^2 - 2.326*SQRT(σ^2))) = 17.72

σ^2 = LN(CV^2/4 + 1) = 0.072 

Choose 

lowest LTA LTAa < LTAc therefore LTAa is used for calculating MDL and AML 

MDL MDL = (LTAa)*(EXP(2.326*SQRT(σ^2) - 0.5*σ^2)) = 12.40 ug/L dissolved Cu 

σ^2 = LN(CV^2 + 1) = 0.263 

z = 2.326 

AML AML = (LTAa)*(EXP(1.645*SQRT(σn^2) - 0.5*σn^2)) = 8.75 ug/L dissolved Cu 

n = 1 

σn^2 = LN((CV^2)/n + 1) = 0.263 

Convert dissolved limits to total recoverable using metals translators. Use conversion factors as translators per EPA guidance (EPA 823-B-96-007). 

MDL tr = MDL dis/0.862 = 14.39 ug/L total recoverable Cu 

AML_tr = AML_dissolved/0.862 = 10.15 ug/L total recoverable Cu 

Compare new and existing limits, choosing the most stringent for new permit. 

Calculated Limit vs. Existing Limit Limit for New Permit 

MDL = 14.39 ppb 13.7 ppb (ug/L) ---> 13.7 ppb Cu 

AML = 10.15 ppb 8.5 ppb (ug/L) ---> 8.5 ppb Cu 
 

Permit No.: WA0037168 

City of Puyallup WWTP 51 

APPENDIX E – MONITORING DATA5 

Puyallup River Receiving Water pH Puyallup River Receiving Water Temp. 

(

o

C) 

DATE TIME PARAMETER VALUE 

9/26/2007 9:20 PH 7.59 

8/22/2007 8:55 PH 7.51 

7/18/2007 9:28 PH 7.41 

6/13/2007 8:10 PH 7.35 

5/23/2007 9:20 PH 7.73 

4/25/2007 8:30 PH 7.39 

3/21/2007 9:00 PH 7.54 

2/14/2007 8:55 PH 7.23 

1/24/2007 10:30 PH 7.36 

11/15/2006 10:20 PH 7.21 

10/18/2006 12:00 PH 7.47 

9/25/2006 12:00 PH 7.36 

8/21/2006 10:05 PH 7.84 

7/24/2006 9:55 PH 7.29 

6/19/2006 9:15 PH 7.33 

4/17/2006 11:10 PH 7.56 

3/13/2006 10:45 PH 7.46 

2/13/2006 12:14 PH 7.37 

1/23/2006 14:12 PH 7.35 

DATE TIME TEST VALUE 

9/26/2007 9:20 TEMP 10.2 

8/22/2007 8:55 TEMP 13.5 

7/18/2007 9:28 TEMP 14.3 

6/13/2007 8:10 TEMP 12.7 

5/23/2007 9:20 TEMP 9.7 

4/25/2007 8:30 TEMP 9.4 

3/21/2007 9:00 TEMP 4.4 

2/14/2007 8:55 TEMP 5.1 

1/24/2007 10:30 TEMP 3.9 

12/20/2006 10:30 TEMP 3.9 

11/15/2006 10:20 TEMP 7.3 

10/18/2006 12:00 TEMP 10.8 

9/25/2006 12:00 TEMP 12.3 

8/21/2006 10:05 TEMP 13.8 

7/24/2006 9:55 TEMP 15.5 

6/19/2006 9:15 TEMP 11.1 

5/15/2006 10:30 TEMP 11.8 

4/17/2006 11:10 TEMP 6.5 

3/13/2006 10:45 TEMP 4.8 

5 U flagged data accounted for as 0.5 times the undetected concentration. 
Permit No.: WA0037168 

City of Puyallup WWTP 52 

12/12/2005 11:23 PH 7.42 2/13/2006 12:14 TEMP 6 

11/14/2005 13:00 PH 7.41 1/23/2006 14:12 TEMP 6.4 

10/17/2005 9:55 PH 7.52 12/12/2005 11:23 TEMP 3.3 

9/19/2005 10:00 PH 7.46 11/14/2005 13:00 TEMP 7.3 

8/15/2005 11:50 PH 7.23 10/17/2005 9:55 TEMP 11.7 

7/18/2005 10:40 PH 7.29 9/19/2005 10:00 TEMP 11.7 

6/13/2005 16:50 PH 7.74 8/15/2005 11:50 TEMP 15 

5/23/2005 16:15 PH 7.6 7/18/2005 10:40 TEMP 15.4 

4/18/2005 15:40 PH 7.46 6/13/2005 16:50 TEMP 14.4 

3/28/2005 16:30 PH 7.48 5/23/2005 16:15 TEMP 11.5 

2/14/2005 16:25 PH 7.51 4/18/2005 15:40 TEMP 9 

1/24/2005 16:40 PH 7.28 3/28/2005 16:30 TEMP 7.8 

12/13/2004 15:35 PH 7.36 2/14/2005 16:25 TEMP 5.4 

11/15/2004 16:30 PH 7.64 1/24/2005 16:40 TEMP 7.6 

10/18/2004 17:00 PH 7.37 12/13/2004 15:35 TEMP 6.1 

9/21/2004 13:45 PH 7.45 11/15/2004 16:30 TEMP 9.4 

8/17/2004 11:15 PH 7.24 10/18/2004 17:00 TEMP 10.2 

7/20/2004 13:54 PH 7.43 9/21/2004 13:45 TEMP 11.7 

6/22/2004 15:05 PH 7.48 8/17/2004 11:15 TEMP 14.1 

5/18/2004 13:55 PH 7.55 7/20/2004 13:54 TEMP 14.4 

4/20/2004 13:40 PH 7.79 6/22/2004 15:05 TEMP 14.6 

3/23/2004 12:15 PH 7.62 5/18/2004 13:55 TEMP 12.3 

2/24/2004 14:32 PH 7.46 4/20/2004 13:40 TEMP 10 

1/27/2004 12:56 PH 7.43 3/23/2004 12:15 TEMP 9.5 

12/16/2003 14:15 PH 7.32 2/24/2004 14:32 TEMP 7.2 
Permit No.: WA0037168 

City of Puyallup WWTP 53 

11/18/2003 14:49 PH 7.45 1/27/2004 12:56 TEMP 4.7 

10/21/2003 15:06 PH 7.24 12/16/2003 14:15 TEMP 6 

9/24/2003 13:40 PH 7.42 11/18/2003 14:49 TEMP 8.4 

8/18/2003 14:25 PH 7.31 10/21/2003 15:06 TEMP 11.9 

7/21/2003 16:30 PH 7.38 9/24/2003 13:40 TEMP 12.4 

6/16/2003 15:00 PH 7.55 8/18/2003 14:25 TEMP 14.7 

5/19/2003 12:55 PH 8.05 7/21/2003 16:30 TEMP 17.9 

4/21/2003 13:30 PH 7.35 6/16/2003 15:00 TEMP 14.9 

3/19/2003 12:55 PH 7.23 5/19/2003 12:55 TEMP 9.1 

2/24/2003 14:05 PH 7.34 4/21/2003 13:30 TEMP 9.4 

1/27/2003 13:23 PH 7.22 3/19/2003 12:55 TEMP 6 

12/11/2002 14:50 PH 7.43 2/24/2003 14:05 TEMP 4 

11/18/2002 13:25 PH 7.36 1/27/2003 13:23 TEMP 7 

10/23/2002 14:10 PH 7.45 12/11/2002 14:50 TEMP 6 

9/24/2002 14:00 PH 7.58 11/18/2002 13:25 TEMP 8.9 

8/27/2002 17:00 PH 7.44 10/23/2002 14:10 TEMP 10.6 

7/30/2002 14:00 PH 7.31 9/24/2002 14:00 TEMP 12.4 

6/25/2002 14:10 PH 7.48 8/27/2002 17:00 TEMP 16.5 

5/28/2002 15:02 PH 7.45 7/30/2002 14:00 TEMP 14.3 

4/16/2002 14:05 PH 7.36 6/25/2002 14:10 TEMP 14.3 

3/26/2002 12:23 PH 7.68 5/28/2002 15:02 TEMP 11.2 

2/19/2002 14:52 PH 7.56 4/16/2002 14:05 TEMP 6.7 

1/29/2002 13:14 PH 7.21 3/26/2002 12:23 TEMP 6.6 

12/11/2001 12:37 PH 7.62 2/19/2002 14:52 TEMP 6 

11/27/2001 13:00 PH 7.46 1/29/2002 13:14 TEMP 3.3 
Permit No.: WA0037168 

City of Puyallup WWTP 54 

10/30/2001 12:10 PH 7.36 12/11/2001 12:37 TEMP 5.4 

9/19/2001 15:26 PH 7.57 11/27/2001 13:00 TEMP 6.2 

8/22/2001 16:20 PH 7.52 10/30/2001 12:10 TEMP 9 

7/18/2001 13:10 PH 7.57 9/19/2001 15:26 TEMP 12.2 

6/20/2001 13:10 PH 7.55 8/22/2001 16:20 TEMP 12.4 

5/23/2001 14:15 PH 7.7 7/18/2001 13:10 TEMP 14 

4/18/2001 13:05 PH 7.63 6/20/2001 13:10 TEMP 14.3 

3/21/2001 12:45 PH 7.83 5/23/2001 14:15 TEMP 14.3 

2/28/2001 13:45 PH 7.43 4/18/2001 13:05 TEMP 9.5 

1/24/2001 15:00 PH 7.7 3/21/2001 12:45 TEMP 7.4 

12/6/2000 14:00 PH 7.57 2/28/2001 13:45 TEMP 4.3 

11/15/2000 12:50 PH 7.56 1/24/2001 15:00 TEMP 5.1 

10/18/2000 12:40 PH 7.6 12/6/2000 14:00 TEMP 4.1 

9/20/2000 13:10 PH 7.3 11/15/2000 12:50 TEMP 4.5 

8/23/2000 13:25 PH 7.53 10/18/2000 12:40 TEMP 10.9 

7/19/2000 13:35 PH 7.7 9/20/2000 13:10 TEMP 12.4 

6/21/2000 13:50 PH 7.6 8/23/2000 13:25 TEMP 15.2 

5/17/2000 14:50 PH 7.8 7/19/2000 13:35 TEMP 12.5 

4/19/2000 14:10 PH 7.8 6/21/2000 13:50 TEMP 10.9 

3/22/2000 14:20 PH 7.6 5/17/2000 14:50 TEMP 9.2 

2/16/2000 14:30 PH 7.4 4/19/2000 14:10 TEMP 8.5 

1/19/2000 14:40 PH 7.6 3/22/2000 14:20 TEMP 5.4 

12/8/1999 14:05 PH 7.4 2/16/2000 14:30 TEMP 0 

11/3/1999 15:10 PH 7.3 1/19/2000 14:40 TEMP 1.9 

10/20/1999 16:15 PH 7.6 12/8/1999 14:05 TEMP 4.4 
Permit No.: WA0037168 

City of Puyallup WWTP 55 

9/22/1999 13:40 PH 7.5 11/3/1999 15:10 TEMP 5.4 

8/18/1999 13:20 PH 7.4 10/20/1999 16:15 TEMP 9.7 

7/21/1999 14:45 PH 7.6 9/22/1999 13:40 TEMP 13.4 

5/26/1999 13:55 PH 7.5 8/18/1999 13:20 TEMP 14.4 

4/21/1999 15:20 PH 8.2 7/21/1999 14:45 TEMP 12.4 

3/24/1999 14:00 PH 7.9 6/23/1999 14:35 TEMP 9.7 

2/17/1999 14:40 PH 7.5 5/26/1999 13:55 TEMP 9.3 

1/20/1999 16:05 PH 7.4 4/21/1999 15:20 TEMP 7.8 

12/16/1998 13:30 PH 7.3 3/24/1999 14:00 TEMP 7.1 

10/21/1998 16:50 PH 7.6 2/17/1999 14:40 TEMP 4.5 

9/23/1998 8:20 PH 7.4 1/20/1999 16:05 TEMP 5 

8/19/1998 7:20 PH 7.5 12/16/1998 13:30 TEMP 5.5 

7/22/1998 7:15 PH 7.1 11/18/1998 15:10 TEMP 6.4 

6/24/1998 7:30 PH 6.9 10/21/1998 16:50 TEMP 9.1 

5/20/1998 7:30 PH 7.3 9/23/1998 8:20 TEMP 12.5 

4/22/1998 7:25 PH 7.4 8/19/1998 7:20 TEMP 10.8 

3/18/1998 8:00 PH 7.2 7/22/1998 7:15 TEMP 15.5 

2/19/1998 8:10 PH 7.3 6/24/1998 7:30 TEMP 11.8 

1/21/1998 8:28 PH 6.8 5/20/1998 7:30 TEMP 10 

12/17/1997 9:30 PH 7.1 4/22/1998 7:25 TEMP 9.6 

11/19/1997 8:30 PH 7 3/18/1998 8:00 TEMP 5.6 

10/22/1997 7:45 PH 6.8 2/19/1998 8:10 TEMP 5.3 

9/23/1997 11:05 PH 7.4 1/21/1998 8:28 TEMP 3.4 

8/20/1997 10:45 PH 7.4 12/17/1997 9:30 TEMP 5.3 

7/23/1997 10:55 PH 7.4 11/19/1997 8:30 TEMP 6.7 
Permit No.: WA0037168 

City of Puyallup WWTP 56 

6/18/1997 11:40 PH 7.6 10/22/1997 7:45 TEMP 9.2 

5/21/1997 11:05 PH 7.4 9/23/1997 11:05 TEMP 15.3 

4/23/1997 11:10 PH 7.5 8/20/1997 10:45 TEMP 14.2 

3/19/1997 11:15 PH 7.3 7/23/1997 10:55 TEMP 13.1 

2/19/1997 11:40 PH 7.4 6/18/1997 11:40 TEMP 11 

1/22/1997 11:25 PH 7.3 5/21/1997 11:05 TEMP 9.1 

12/17/1996 12:05 PH 7.4 4/23/1997 11:10 TEMP 7.8 

11/20/1996 11:15 PH 7.7 3/19/1997 11:15 TEMP 6.6 

10/23/1996 11:45 PH 7.6 2/19/1997 11:40 TEMP 4.6 

9/18/1996 13:15 PH 7.6 1/22/1997 11:25 TEMP 5.1 

8/21/1996 13:20 PH 7.7 12/17/1996 12:05 TEMP 4.5 

7/24/1996 13:10 PH 7.5 11/20/1996 11:15 TEMP 3.5 

6/19/1996 13:00 PH 7.7 10/23/1996 11:45 TEMP 7.5 

5/22/1996 13:45 PH 7.6 9/18/1996 13:15 TEMP 9.8 

4/24/1996 12:55 PH 7.4 8/21/1996 13:20 TEMP 14.8 

3/20/1996 13:30 PH 7.2 7/24/1996 13:10 TEMP 17.9 

2/21/1996 13:35 PH 7.3 6/19/1996 13:00 TEMP 12.9 

1/24/1996 14:15 PH 7.2 5/22/1996 13:45 TEMP 10.2 

12/19/1995 13:20 PH 7.5 4/24/1996 12:55 TEMP 8.3 

11/21/1995 14:30 PH 7.2 3/20/1996 13:30 TEMP 7.7 

10/18/1995 13:30 PH 7.6 2/21/1996 13:35 TEMP 5.7 

9/18/1995 7:25 PH 7.2 1/24/1996 14:15 TEMP 4.8 

8/21/1995 7:40 PH 6.9 12/19/1995 13:20 TEMP 6 

7/17/1995 8:00 PH 7.1 11/21/1995 14:30 TEMP 7.3 

6/19/1995 7:35 PH 7.7 10/18/1995 13:30 TEMP 10.6 
Permit No.: WA0037168 

City of Puyallup WWTP 57 

5/15/1995 7:05 PH 7.2 9/18/1995 7:25 TEMP 13.2 

4/17/1995 7:50 PH 7 8/21/1995 7:40 TEMP 14.9 

3/20/1995 7:40 PH 7.5 7/17/1995 8:00 TEMP 16.8 

2/20/1995 7:50 PH 7.4 6/19/1995 7:35 TEMP 12.6 

1/16/1995 7:50 PH 7.7 5/15/1995 7:05 TEMP 12.9 

12/19/1994 7:50 PH 7.8 4/17/1995 7:50 TEMP 8.5 

11/14/1994 8:30 PH 7.3 3/20/1995 7:40 TEMP 7.3 

10/17/1994 7:40 PH 7.4 2/20/1995 7:50 TEMP 6.4 

9/28/1994 10:50 PH 7.3 1/16/1995 7:50 TEMP 4.7 

8/24/1994 10:30 PH 7.6 12/19/1994 7:50 TEMP 5.2 

7/27/1994 11:10 PH 7.1 11/14/1994 8:30 TEMP 7.1 

6/29/1994 10:30 PH 7.4 10/17/1994 7:40 TEMP 8.6 

5/25/1994 11:40 PH 7.7 9/28/1994 10:50 TEMP 12.8 

4/27/1994 11:20 PH 7.5 8/24/1994 10:30 TEMP 14.2 

3/30/1994 9:50 PH 7.4 7/27/1994 11:10 TEMP 15.8 

2/23/1994 10:35 PH 7.4 6/29/1994 10:30 TEMP 14.8 

1/26/1994 12:00 PH 7.5 5/25/1994 11:40 TEMP 13.6 

12/21/1993 12:15 PH 7.4 4/27/1994 11:20 TEMP 8.6 

11/22/1993 14:40 PH 7.6 3/30/1994 9:50 TEMP 7.7 

10/27/1993 11:40 PH 7.3 2/23/1994 10:35 TEMP 4.1 

9/28/1993 13:05 PH 7.2 1/26/1994 12:00 TEMP 5.6 

7/27/1993 11:50 PH 7.4 12/21/1993 12:15 TEMP 3.5 

6/29/1993 12:35 PH 7.5 11/22/1993 14:40 TEMP 5.1 

5/25/1993 11:30 PH 7.2 10/27/1993 11:40 TEMP 10.5 

4/27/1993 12:15 PH 7.5 9/28/1993 13:05 TEMP 11.6 
Permit No.: WA0037168 

City of Puyallup WWTP 58 

3/23/1993 11:45 PH 7.2 8/24/1993 12:40 TEMP 13 

2/23/1993 11:00 PH 7.3 7/27/1993 11:50 TEMP 15.9 

1/26/1993 12:05 PH 7.2 6/29/1993 12:35 TEMP 12.3 

12/21/1992 12:30 PH 7.6 5/25/1993 11:30 TEMP 12.5 

11/22/1992 13:15 PH 7.2 4/27/1993 12:15 TEMP 9 

10/27/1992 12:20 PH 7.5 3/23/1993 11:45 TEMP 7.1 

9/30/1992 9:40 PH 7.6 2/23/1993 11:00 TEMP 2.9 

8/26/1992 9:00 PH 7.4 1/26/1993 12:05 TEMP 6.6 

7/29/1992 9:30 PH 7.5 12/21/1992 12:30 TEMP 4.3 

6/24/1992 8:50 PH 7.5 11/22/1992 13:15 TEMP 6.9 

5/27/1992 9:25 PH 7.1 10/27/1992 12:20 TEMP 10.4 

4/29/1992 9:25 PH 7.6 9/30/1992 9:40 TEMP 13 

3/25/1992 9:15 PH 7 8/26/1992 9:00 TEMP 13.2 

2/26/1992 9:45 PH 7.3 7/29/1992 9:30 TEMP 14.1 

1/29/1992 9:20 PH 7.5 6/24/1992 8:50 TEMP 15.9 

12/18/1991 9:10 PH 7.4 5/27/1992 9:25 TEMP 13.4 

11/20/1991 9:30 PH 7.2 4/29/1992 9:25 TEMP 11.8 

10/30/1991 9:50 PH 7.2 3/25/1992 9:15 TEMP 9.3 

9/25/1991 10:40 PH 7.4 2/26/1992 9:45 TEMP 6.8 

8/28/1991 10:55 PH 7.4 1/29/1992 9:20 TEMP 6.4 

7/31/1991 10:10 PH 7.9 12/18/1991 9:10 TEMP 4.5 

6/26/1991 10:25 PH 7 11/20/1991 9:30 TEMP 7 

5/29/1991 12:15 PH 7.7 10/30/1991 9:50 TEMP 8 

4/24/1991 11:05 PH 7.4 9/25/1991 10:40 TEMP 11.5 

3/27/1991 10:55 PH 7 8/28/1991 10:55 TEMP 13.8 
Permit No.: WA0037168 

City of Puyallup WWTP 59 

2/27/1991 10:35 PH 7.3 7/31/1991 10:10 TEMP 14.4 

1/30/1991 13:30 PH 7.3 6/26/1991 10:25 TEMP 12 

12/19/1990 

11/28/1990 

13:25 

13:50 

PH 

PH 

7.6 

7.4 

5/29/1991 

4/24/1991 

12:15 

11:05 

TEMP 

TEMP 

10.9 

9.2 

10/31/1990 

9/26/1990 

13:25 

11:20 

PH 

PH 

7.7 

7.6 

3/27/1991 

2/27/1991 

10:55 

10:35 

TEMP 

TEMP 

6.2 

5.8 

8/29/1990 

7/31/1990 

11:45 

11:50 

PH 

PH 

7.5 

7.6 

1/30/1991 

12/19/1990 

13:30 

13:25 

TEMP 

TEMP 

2.9 

2 

6/27/1990 10:35 PH 7.3 11/28/1990 13:50 TEMP 6.3 

5/31/1990 

4/25/1990 

10:45 

11:35 

PH 

PH 

7.3 

7.1 

10/31/1990 

9/26/1990 

13:25 

11:20 

TEMP 

TEMP 

9.1 

14.2 

3/28/1990 

2/28/1990 

13:40 

10:25 

PH 

PH 

7.7 

7.3 

8/29/1990 

7/31/1990 

11:45 

11:50 

TEMP 

TEMP 

16.1 

14.1 

6/27/1990 

5/31/1990 

10:35 

10:45 

TEMP 

TEMP 

13.5 

10.7 

4/25/1990 11:35 TEMP 8.7 

3/28/1990 

2/28/1990 

13:40 

10:25 

TEMP 

TEMP 

8.5 

3.9 

1/31/1990 11:10 TEMP 4.1 
Permit No.: WA0037168 

City of Puyallup WWTP 60 

Puyallup River Receiving Water Hardness 

(mg/L as CaCO3) 

Puyallup River Receiving Water Metals 

(ug/L) 

8/21/2006 10:05 HARD 32.7 

6/19/2006 9:15 HARD 23.9 

2/13/2006 12:14 HARD 31.6 

12/12/2005 11:23 HARD 32.3 

10/17/2005 9:55 HARD 32.3 

8/20/1997 10:45 HARD 27 

6/18/1997 11:40 HARD 21 

4/23/1997 11:10 HARD 24 

2/19/1997 11:40 HARD 22 

12/17/1996 12:05 HARD 28 

10/23/1996 11:45 HARD 26 

8/21/1996 13:20 HARD 30 

6/19/1996 13:00 HARD 26 

4/24/1996 12:55 HARD 26 

2/21/1996 13:35 HARD 24 

12/19/1995 13:20 HARD 24 

10/18/1995 13:30 HARD 20 

3/20/1995 7:40 HARD 28 

1/16/1995 7:50 HARD 26 

11/14/1994 8:30 HARD 28 

9/28/1994 10:50 HARD 41E 

7/27/1994 11:10 HARD 37E 

8/21/2006 10:05 Ag_DIS 0.02 U 

6/19/2006 9:15 Ag_DIS 0.02 U 

2/13/2006 12:14 Ag_DIS 0.02 U 

12/12/2005 11:23 Ag_DIS 0.02 U 

10/17/2005 9:55 Ag_DIS 0.02 U 

8/21/2006 10:05 As_DIS 0.42 

6/19/2006 9:15 As_DIS 0.57 

2/13/2006 12:14 As_DIS 0.5 

12/12/2005 11:23 As_DIS 0.55 

10/17/2005 9:55 As_DIS 0.6 

8/21/2006 10:05 As_TR 1.14 

6/19/2006 9:15 As_TR 0.68 

2/13/2006 12:14 As_TR 0.53 

12/12/2005 11:23 As_TR 0.63 

10/17/2005 9:55 As_TR 0.79 

6/25/2002 14:10 As_TR 0.58 

5/28/2002 15:02 As_TR 0.77 

4/16/2002 14:05 As_TR 0.96 

3/26/2002 12:23 As_TR 0.47 

2/19/2002 14:52 As_TR 0.62 
Permit No.: WA0037168 

City of Puyallup WWTP 61 

5/25/1994 11:40 HARD 24E 1/29/2002 13:14 As_TR 0.47 

10/30/1991 9:50 HARD 30 12/11/2001 12:37 As_TR 0.67 

10/13/1982 12:15 HARD 32 11/27/2001 13:00 As_TR 0.56 

12/18/1974 11:50 HARD 24 10/30/2001 12:10 As_TR 0.63 

12/11/1974 10:20 HARD 37 9/19/2001 15:26 As_TR 0.85 

11/20/1974 11:15 HARD 35 8/22/2001 16:20 As_TR 1.1 

11/14/1974 11:00 HARD 28 

Puyallup River Receiving Water NH3-N 

(mg/L) 

Puyallup River Receiving Water Metals 

(ug/L) 

9/26/2007 9:20 NH3_N 0.044 

8/22/2007 8:55 NH3_N 0.01 U 

7/18/2007 9:28 NH3_N 0.017 

6/13/2007 8:10 NH3_N 0.01 

5/23/2007 9:20 NH3_N 0.01 U 

4/25/2007 8:30 NH3_N 0.01 U 

3/21/2007 9:00 NH3_N 0.01 U 

2/14/2007 8:55 NH3_N 0.021 

1/24/2007 10:30 NH3_N 0.038 

12/20/2006 10:30 NH3_N 0.03 

11/15/2006 10:20 NH3_N 0.01 U 

10/18/2006 12:00 NH3_N 0.013 

9/25/2006 12:00 NH3_N 0.012 

8/21/2006 10:05 Cu_DIS 0.65 

6/19/2006 9:15 Cu_DIS 0.74 

2/13/2006 12:14 Cu_DIS 0.87 

12/12/2005 11:23 Cu_DIS 0.79 

10/17/2005 9:55 Cu_DIS 0.95 

8/20/1997 10:45 CU_DIS 0.514 

6/18/1997 11:40 CU_DIS 0.716 

4/23/1997 11:10 CU_DIS 0.781 

2/19/1997 11:40 CU_DIS 0.715 

12/17/1996 12:05 CU_DIS 0.77 

10/23/1996 11:45 CU_DIS 0.794 

8/21/1996 13:20 CU_DIS 0.49 

6/19/1996 13:00 CU_DIS 0.571 
Permit No.: WA0037168 

City of Puyallup WWTP 62 

8/21/2006 10:05 NH3_N 0.01 U 

7/24/2006 9:55 NH3_N 0.01 

6/19/2006 9:15 NH3_N 0.01 U 

5/15/2006 10:30 NH3_N 0.01 U 

4/17/2006 11:10 NH3_N 0.011 

3/13/2006 10:45 NH3_N 0.01 U 

2/13/2006 12:14 NH3_N 0.024 

1/23/2006 14:12 NH3_N 0.016 

12/12/2005 11:23 NH3_N 0.017 

11/14/2005 13:00 NH3_N 0.01 U 

10/17/2005 9:55 NH3_N 0.031 

9/19/2005 10:00 NH3_N 0.015 

8/15/2005 11:50 NH3_N 0.01 U 

7/18/2005 10:40 NH3_N 0.012 

6/13/2005 16:50 NH3_N 0.01 U 

5/23/2005 16:15 NH3_N 0.01 U 

4/18/2005 15:40 NH3_N 0.022 

3/28/2005 16:30 NH3_N 0.024 

2/14/2005 16:25 NH3_N 0.065 

1/24/2005 16:40 NH3_N 0.022 

12/13/2004 15:35 NH3_N 0.018 

11/15/2004 16:30 NH3_N 0.025 

10/18/2004 17:00 NH3_N 0.01 U 

9/21/2004 13:45 NH3_N 0.012 

8/17/2004 11:15 NH3_N 0.01 U 

4/24/1996 

2/21/1996 

12/19/1995 

10/16/1995 

3/20/1995 

1/16/1995 

11/14/1994 

9/28/1994 

7/27/1994 

5/25/1994 

8/21/2006 

6/19/2006 

2/13/2006 

12/12/2005 

10/17/2005 

8/20/1997 

6/18/1997 

4/23/1997 

2/19/1997 

12/17/1996 

10/23/1996 

12:55 CU_DIS 1.37 

13:35 CU_DIS 0.878 

13:20 CU_DIS 0.708 

14:01 CU_DIS 0.903 

7:40 CU_DIS 1.55 

7:50 CU_DIS 0.855 

8:30 CU_DIS 0.865 

10:50 CU_DIS 0.535 

11:10 CU_DIS 0.531 

11:40 CU_DIS 0.446 

10:05 Hg 0.0136 

0.002 

9:15 Hg U 

12:14 Hg 0.0034 

0.002 

11:23 Hg U 

9:55 Hg 0.0035 

10:45 HG 0.003 

11:40 HG 0.002 

0.002 

11:10 HG U 

11:40 HG 0.003 

12:05 HG 0.003 

11:45 HG 

0.001 
Permit No.: WA0037168 

City of Puyallup WWTP 63 

7/20/2004 13:54 NH3_N 

6/22/2004 15:05 NH3_N 

5/18/2004 13:55 NH3_N 

4/20/2004 13:40 NH3_N 

3/23/2004 12:15 NH3_N 

2/24/2004 14:32 NH3_N 

1/27/2004 12:56 NH3_N 

12/16/2003 14:15 NH3_N 

11/18/2003 14:49 NH3_N 

10/21/2003 15:06 NH3_N 

9/24/2003 13:40 NH3_N 

8/18/2003 14:25 NH3_N 

7/21/2003 16:30 NH3_N 

6/16/2003 15:00 NH3_N 

5/19/2003 12:55 NH3_N 

4/21/2003 13:30 NH3_N 

3/19/2003 12:55 NH3_N 

2/24/2003 14:05 NH3_N 

1/27/2003 13:23 NH3_N 

12/11/2002 14:50 NH3_N 

11/18/2002 13:25 NH3_N 

10/23/2002 14:10 NH3_N 

9/24/2002 14:00 NH3_N 

8/27/2002 17:00 NH3_N 

7/30/2002 14:00 NH3_N 

0.048
 

0.01 U 

0.011 

0.013 

0.016 

0.024 

0.015 

0.025 

0.01 U 

0.012 

0.021 

0.019 

0.016 

0.014 

0.013 

0.033 

0.01 U 

0.011 

0.019 

0.06 

0.01 U 

0.014 

0.02 

0.013 

0.024 

U 

8/21/1996 13:20 HG 0.003 

6/19/1996 13:00 HG 0.001 

0.001 

4/24/1996 12:55 HG U 

2/21/1996 13:35 HG 0.005 J 

12/19/1995 13:20 HG 0.004 J 

10/18/1995 13:30 HG 0.002 

3/20/1995 7:40 HG 0.001 J 

0.001 

1/16/1995 7:50 HG U 

11/14/1994 8:30 HG 0.002 J 

9/28/1994 10:50 HG 0.017 

7/27/1994 11:10 HG 0.009 J 

5/25/1994 11:40 HG 0.001 J 

8/21/2006 10:05 Pb_DIS 0.029 

6/19/2006 9:15 Pb_DIS 0.031 

2/13/2006 12:14 Pb_DIS 0.027 

12/12/2005 11:23 Pb_DIS 0.037 

10/17/2005 9:55 Pb_DIS 0.04 

0.02 

8/20/1997 10:45 PB_DIS U 

0.02 

6/18/1997 11:40 PB_DIS U 
Permit No.: WA0037168 

City of Puyallup WWTP 64 

6/25/2002 14:10 NH3_N 0.02 

5/28/2002 15:02 NH3_N 0.02 

4/16/2002 14:05 NH3_N 0.018 

3/26/2002 12:23 NH3_N 0.027 

2/19/2002 14:52 NH3_N 0.034 

1/29/2002 13:14 NH3_N 0.04 

12/11/2001 12:37 NH3_N 0.041 

11/27/2001 13:00 NH3_N 0.028 

10/30/2001 12:10 NH3_N 0.015 

9/19/2001 15:26 NH3_N 0.085 

8/22/2001 16:20 NH3_N 0.018 

7/18/2001 13:10 NH3_N 0.043 

6/20/2001 13:10 NH3_N 0.011 

5/23/2001 14:15 NH3_N 0.026 

4/18/2001 13:05 NH3_N 0.01 U 

3/21/2001 12:45 NH3_N 0.01 U 

2/28/2001 13:45 NH3_N 0.023 

1/24/2001 15:00 NH3_N 0.021 

12/6/2000 14:00 NH3_N 0.01 U 

11/15/2000 12:50 NH3_N 0.01 U 

10/18/2000 12:40 NH3_N 0.032 

9/20/2000 13:10 NH3_N 0.01 U 

8/23/2000 13:25 NH3_N 0.012 

7/19/2000 13:35 NH3_N 0.03 

6/21/2000 13:50 NH3_N 0.011 

4/23/1997 11:10 PB_DIS 0.15 

0.03 

2/19/1997 11:40 PB_DIS U 

12/17/1996 12:05 PB_DIS 0.037 

10/23/1996 11:45 PB_DIS 0.031 

0.02 

8/21/1996 13:20 PB_DIS U 

6/19/1996 13:00 PB_DIS 0.022 

4/24/1996 12:55 PB_DIS 0.042 

2/21/1996 13:35 PB_DIS 0.031 

0.03 

12/19/1995 13:20 PB_DIS U 

0.03 

10/18/1995 13:30 PB_DIS U 

0.052 

3/20/1995 7:40 PB_DIS J 

0.022 

1/16/1995 7:50 PB_DIS J 

11/14/1994 8:30 PB_DIS 0.208 

0.02 

9/28/1994 10:50 PB_DIS U 

0.02 

7/27/1994 11:10 PB_DIS U 

0.02 

5/25/1994 11:40 PB_DIS U 

8/21/2006 10:05 Zn_DIS 1.2 

6/19/2006 9:15 Zn_DIS 3.2 
Permit No.: WA0037168 

City of Puyallup WWTP 65 

5/17/2000 14:50 NH3_N 0.01 U 2/13/2006 12:14 Zn_DIS 2.7 

4/19/2000 14:10 NH3_N 0.01 U 12/12/2005 11:23 Zn_DIS 4.1 

3/22/2000 14:20 NH3_N 0.023 10/17/2005 9:55 Zn_DIS 2.2 

2/16/2000 14:30 NH3_N 0.01 U 8/20/1997 10:45 ZN_DIS 0.75 

1/19/2000 14:40 NH3_N 0.01 U 6/18/1997 11:40 ZN_DIS 0.21 

12/8/1999 14:05 NH3_N 0.019 4/23/1997 11:10 ZN_DIS 0.82 

11/3/1999 15:10 NH3_N 0.01 U 2/19/1997 11:40 ZN_DIS 0.86 

10/20/1999 16:15 NH3_N 0.01 UJ 12/17/1996 12:05 ZN_DIS 1.1 

9/22/1999 13:40 NH3_N 0.046 10/23/1996 11:45 ZN_DIS 2.2 J 

8/18/1999 13:20 NH3_N 0.051 8/21/1996 13:20 ZN_DIS 0.87 

7/21/1999 14:45 NH3_N 0.027 6/19/1996 13:00 ZN_DIS 0.51 

6/23/1999 14:35 NH3_N 0.019 4/24/1996 12:55 ZN_DIS 0.56 

5/26/1999 13:55 NH3_N 0.031 2/21/1996 13:35 ZN_DIS 1 U 

4/21/1999 15:20 NH3_N 0.01 U 12/19/1995 13:20 ZN_DIS 5 U 

3/24/1999 14:00 NH3_N 0.022 10/18/1995 13:30 ZN_DIS 1.7 

2/17/1999 14:40 NH3_N 0.01 U 3/20/1995 7:40 ZN_DIS 1.6 J 

1/20/1999 16:05 NH3_N 0.01 U 1/16/1995 7:50 ZN_DIS 0.44 J 

12/16/1998 13:30 NH3_N 0.025 11/14/1994 8:30 ZN_DIS 2.4 J 

11/18/1998 15:10 NH3_N 0.039 9/28/1994 10:50 ZN_DIS 1 U 

10/21/1998 16:50 NH3_N 0.034 7/27/1994 11:10 ZN_DIS 1 U 

9/23/1998 8:20 NH3_N 0.01 U 5/25/1994 11:40 ZN_DIS 2.1 J 

8/19/1998 7:20 NH3_N 0.01 U 

7/22/1998 7:15 NH3_N 0.033 

6/24/1998 7:30 NH3_N 0.01 U 

5/20/1998 7:30 NH3_N 0.02 
Permit No.: WA0037168 

City of Puyallup WWTP 66 

4/22/1998 7:25 NH3_N 0.027 

3/18/1998 8:00 NH3_N 0.01 U 

2/19/1998 8:10 NH3_N 0.011 

1/21/1998 8:28 NH3_N 0.019 

12/17/1997 9:30 NH3_N 0.038 

11/19/1997 8:30 NH3_N 0.015 

10/22/1997 7:45 NH3_N 0.01 U 

9/23/1997 11:05 NH3_N 0.019 

8/20/1997 10:45 NH3_N 0.016 

7/23/1997 10:55 NH3_N 0.01 U 

6/18/1997 11:40 NH3_N 0.01 UJ 

5/21/1997 11:05 NH3_N 0.019 

4/23/1997 11:10 NH3_N 0.032 

3/19/1997 11:15 NH3_N 0.038 

2/19/1997 11:40 NH3_N 0.013 

1/22/1997 11:25 NH3_N 0.029 

12/17/1996 12:05 NH3_N 0.039 

11/20/1996 11:15 NH3_N 0.023 

10/23/1996 11:45 NH3_N 0.01 U 

9/18/1996 13:15 NH3_N 0.01 U 

8/21/1996 13:20 NH3_N 0.012 

7/24/1996 13:10 NH3_N 0.01 U 

6/19/1996 13:00 NH3_N 0.01 U 

5/22/1996 13:45 NH3_N 0.013 

4/24/1996 12:55 NH3_N 0.036 
Permit No.: WA0037168 

City of Puyallup WWTP 67 

3/20/1996 13:30 NH3_N 0.01 U 

2/21/1996 13:35 NH3_N 0.01 U 

1/24/1996 14:15 NH3_N 0.03 

12/19/1995 13:20 NH3_N 0.023 

11/21/1995 14:30 NH3_N 0.021 

10/18/1995 13:30 NH3_N 0.01 U 

9/18/1995 7:25 NH3_N 0.038 

8/21/1995 7:40 NH3_N 0.01 U 

7/17/1995 8:00 NH3_N 0.015 

6/19/1995 7:35 NH3_N 0.023 

5/15/1995 7:05 NH3_N 0.027 

4/17/1995 7:50 NH3_N 0.015 

3/20/1995 7:40 NH3_N 0.01 U 

2/20/1995 7:50 NH3_N 0.045 

1/16/1995 7:50 NH3_N 0.019 

12/19/1994 7:50 NH3_N 0.01 U 

11/14/1994 8:30 NH3_N 0.026 

10/17/1994 7:40 NH3_N 0.01 U 

9/28/1994 10:50 NH3_N 0.024 

8/24/1994 10:30 NH3_N 0.01 UJ 

7/27/1994 11:10 NH3_N 0.01 U 

6/29/1994 10:30 NH3_N 0.053 

5/25/1994 11:40 NH3_N 0.01 U 

4/27/1994 11:20 NH3_N 0.016 

3/30/1994 9:50 NH3_N 0.01 
Permit No.: WA0037168 

City of Puyallup WWTP 68 

2/23/1994 10:35 NH3_N 0.039 

1/26/1994 12:00 NH3_N 0.039 

12/21/1993 12:15 NH3_N 0.033 

11/22/1993 14:40 NH3_N 0.1 

10/27/1993 11:40 NH3_N 0.017 

9/28/1993 13:05 NH3_N 0.019 

8/24/1993 12:40 NH3_N 0.017 

7/27/1993 11:50 NH3_N 0.018 

6/29/1993 12:35 NH3_N 0.037 

5/25/1993 11:30 NH3_N 0.033 

4/27/1993 12:15 NH3_N 0.03 

3/23/1993 11:45 NH3_N 0.045 

2/23/1993 11:00 NH3_N 0.027 

1/26/1993 12:05 NH3_N 0.067 

12/21/1992 12:30 NH3_N 0.059 

11/22/1992 13:15 NH3_N 0.039 

10/27/1992 12:20 NH3_N 0.019 

9/30/1992 9:40 NH3_N 0.02 

8/26/1992 9:00 NH3_N 0.04 

7/29/1992 9:30 NH3_N 0.04 

6/24/1992 8:50 NH3_N 0.03 

5/27/1992 9:25 NH3_N 0.01 

4/29/1992 9:25 NH3_N 0.03 

3/25/1992 9:15 NH3_N 0.03 

2/26/1992 9:45 NH3_N 0.02 
Permit No.: WA0037168 

City of Puyallup WWTP 69 

1/29/1992 9:20 NH3_N 0.05 

12/18/1991 9:10 NH3_N 0.03 

11/20/1991 9:30 NH3_N 0.04 

10/30/1991 9:50 NH3_N 0.02 

9/25/1991 10:40 NH3_N 0.03 

8/28/1991 10:55 NH3_N 0.04 

7/31/1991 10:10 NH3_N 0.03 

6/26/1991 10:25 NH3_N 0.01 U 

5/29/1991 12:15 NH3_N 0.01 

4/24/1991 11:05 NH3_N 0.02 

3/27/1991 10:55 NH3_N 0.03 

2/27/1991 10:35 NH3_N 0.02 

1/30/1991 13:30 NH3_N 0.03 

12/19/1990 13:25 NH3_N 0.03 

11/28/1990 13:50 NH3_N 0.02 

10/31/1990 13:25 NH3_N 0.03 

9/26/1990 11:20 NH3_N 0.01 

8/29/1990 11:45 NH3_N 0.03 

7/31/1990 11:50 NH3_N 0.04 

6/27/1990 10:35 NH3_N 0.02 

5/31/1990 10:45 NH3_N 0.03 

4/25/1990 11:35 NH3_N 0.02 

3/28/1990 13:40 NH3_N 0.02 

2/28/1990 10:25 NH3_N 0.03 

1/31/1990 11:10 NH3_N 0.06 
Permit No.: WA0037168 

City of Puyallup WWTP 70 

EFFLUENT DATA 

Note on units: Metals are in ug/L. Ammonia, BOD5, and TSS are in mg/L. Temperature is in 

degrees Celsius. pH is in standard units. Fecal coliform is in cfu/100mL. 

TEST DATE MCMNMCAVMCMX 

AMMONIA, TOTAL 08/31/2003 1.2 3.9 

AMMONIA, TOTAL 09/30/2003 0.8 2.3 

AMMONIA, TOTAL 10/31/2003 0.6 2.2 

AMMONIA, TOTAL 11/30/2003 0.6 2.6 

AMMONIA, TOTAL 12/31/2003 0.5 1.1 

AMMONIA, TOTAL 01/31/2004 0.9 2.7 

AMMONIA, TOTAL 02/29/2004 2.3 9.3 

AMMONIA, TOTAL 03/31/2004 0.5 1.0 

AMMONIA, TOTAL 04/30/2004 0.4 0.6 

AMMONIA, TOTAL 05/31/2004 0.5 0.7 

AMMONIA, TOTAL 06/30/2004 0.3 0.4 

AMMONIA, TOTAL 07/31/2004 0.4 1.3 

AMMONIA, TOTAL 08/31/2004 1.0 2.5 

AMMONIA, TOTAL 09/30/2004 0.5 0.8 

AMMONIA, TOTAL 10/31/2004 0.2 0.4 

AMMONIA, TOTAL 11/30/2004 0.2 0.5 

AMMONIA, TOTAL 12/31/2004 0.2 0.4 

AMMONIA, TOTAL 01/31/2005 0.2 0.8 

AMMONIA, TOTAL 02/28/2005 0.2 0.5 

AMMONIA, TOTAL 03/31/2005 0.3 0.6 
Permit No.: WA0037168 

City of Puyallup WWTP 71 

AMMONIA, TOTAL 04/30/2005 0.2 0.6 

AMMONIA, TOTAL 05/31/2005 0.2 0.4 

AMMONIA, TOTAL 06/30/2005 0.3 0.7 

AMMONIA, TOTAL 07/31/2005 0.6 1.6 

AMMONIA, TOTAL 08/31/2005 0.2 0.5 

AMMONIA, TOTAL 09/30/2005 0.5 2.1 

AMMONIA, TOTAL 10/31/2005 0.2 0.5 

AMMONIA, TOTAL 11/30/2005 0.2 0.3 

AMMONIA, TOTAL 12/31/2005 0.1 0.2 

AMMONIA, TOTAL 01/31/2006 0.4 1.8 

AMMONIA, TOTAL 02/28/2006 0.1 0.3 

AMMONIA, TOTAL 03/31/2006 0.1 0.3 

AMMONIA, TOTAL 04/30/2006 0.2 0.3 

AMMONIA, TOTAL 05/31/2006 0.2 0.5 

AMMONIA, TOTAL 06/30/2006 5.0 6.0 

AMMONIA, TOTAL 07/31/2006 0.9 2.0 

AMMONIA, TOTAL 08/31/2006 0.4 0.9 

AMMONIA, TOTAL 09/30/2006 0.7 2.3 

AMMONIA, TOTAL 10/31/2006 0.1 0.2 

AMMONIA, TOTAL 11/30/2006 0.7 1.2 

AMMONIA, TOTAL 12/31/2006 0.3 0.8 

AMMONIA, TOTAL 01/31/2007 1.1 3.9 

AMMONIA, TOTAL 02/28/2007 0.1 0.3 

AMMONIA, TOTAL 03/31/2007 0.4 1.1 
Permit No.: WA0037168 

City of Puyallup WWTP 72 

AMMONIA, TOTAL 04/30/2007 0.2 0.9 

AMMONIA, TOTAL 05/31/2007 0.1 0.1 

AMMONIA, TOTAL 06/30/2007 0.1 0.1 

AMMONIA, TOTAL 07/31/2007 0.5 1.4 

AMMONIA, TOTAL 08/31/2007 0.4 1.1 

AMMONIA, TOTAL 09/30/2007 0.5 0.9 

AMMONIA, TOTAL 10/31/2007 0.4 1.6 

AMMONIA, TOTAL 11/30/2007 0.1 0.2 

AMMONIA, TOTAL 12/31/2007 0.3 0.6 

AMMONIA, TOTAL 01/31/2008 0.1 0.2 

AMMONIA, TOTAL 02/29/2008 0.1 0.0 

AMMONIA, TOTAL 03/31/2008 0.1 0.1 

AMMONIA, TOTAL 04/30/2008 0.1 0.1 

AMMONIA, TOTAL 05/31/2008 0.1 0.1 

AMMONIA, TOTAL 06/30/2008 0.1 0.2 

AMMONIA, TOTAL 07/31/2008 0.6 1.5 

AMMONIA, TOTAL 08/31/2008 0.5 1.3 

AMMONIA, TOTAL 09/30/2008 0.3 0.8 

AMMONIA, TOTAL 10/31/2008 0.1 0.2 

AMMONIA, TOTAL 11/30/2008 0.1 0.2 

AMMONIA, TOTAL 12/31/2008 0.2 0.4 

AMMONIA, TOTAL 1/31/2009 1.8 4.3 

AMMONIA, TOTAL 2/28/2009 0.6 1.7 

AMMONIA, TOTAL 3/31/2009 0.1 0.2 
Permit No.: WA0037168 

City of Puyallup WWTP 73 

AMMONIA, TOTAL 4/30/2009 0.1 0.1 

AMMONIA, TOTAL 5/31/2009 0.1 0.1 

AMMONIA, TOTAL 6/30/2009 0.1 0.1 

AMMONIA, TOTAL 7/31/2009 0.1 0.3 

AMMONIA, TOTAL 8/31/2009 0.5 1.8 

AMMONIA, TOTAL 9/30/2009 0.9 2.9 

AMMONIA, TOTAL 10/13/2009 0.9 2.9 

AMMONIA, TOTAL 10/31/2009 0.4 1.0 

AMMONIA, TOTAL 11/30/2009 0.1 0.3 

AMMONIA, TOTAL 12/31/2009 0.1 0.1 

AMMONIA, TOTAL 1/31/2010 0.1 0.3 

AMMONIA, TOTAL 2/28/2010 0.1 0.1 

AMMONIA, TOTAL 3/31/2010 0.1 0.1 

AMMONIA, TOTAL 4/30/2010 0.1 0.1 

AMMONIA, TOTAL 5/31/2010 0.1 0.2 

AMMONIA, TOTAL 6/30/2010 0.1 0.1 

AMMONIA, TOTAL 7/31/2010 0.2 0.7 

AMMONIA, TOTAL 8/31/2010 0.3 1.8 

AMMONIA, TOTAL 9/30/2010 0.1 0.2 

AMMONIA, TOTAL 10/31/2010 0.1 0.4 

AMMONIA, TOTAL 11/30/2010 0.1 0.3 

AMMONIA, TOTAL 12/31/2010 0.2 0.4 

AMMONIA, TOTAL 1/31/2011 0.1 0.2 

AMMONIA, TOTAL 2/28/2011 0.1 0.1 
Permit No.: WA0037168 

City of Puyallup WWTP 74 

AMMONIA, TOTAL 3/31/2011 0.1 0.1 

AMMONIA, TOTAL 4/30/2011 0.1 0.2 

AMMONIA, TOTAL 5/31/2011 0.6 2.2 

AMMONIA, TOTAL 6/30/2011 2.7 7.3 

AMMONIA, TOTAL 7/31/2011 0.1 0.3 

AMMONIA, TOTAL 8/31/2011 0.1 0.2 

AMMONIA, TOTAL 9/30/2011 0.2 0.4 

AMMONIA, TOTAL 10/31/2011 0.3 0.6 

AMMONIA, TOTAL 11/30/2011 0.1 0.3 

AMMONIA, TOTAL 12/31/2011 0.3 0.7 

BOD5 08/31/2003 6.4 4.3 

BOD5 09/30/2003 5.7 4.0 

BOD5 10/31/2003 7.4 4.0 

BOD5 11/30/2003 5.0 4.2 

BOD5 12/31/2003 6.2 4.5 

BOD5 01/31/2004 7.4 5.9 

BOD5 02/29/2004 8.7 6.5 

BOD5 03/31/2004 7.6 6.4 

BOD5 04/30/2004 7.5 4.8 

BOD5 05/31/2004 5.7 4.4 

BOD5 06/30/2004 3.8 2.5 

BOD5 08/31/2004 9.0 6.0 

BOD5 09/30/2004 6.5 4.7 

BOD5 10/31/2004 4.3 2.5 
Permit No.: WA0037168 

City of Puyallup WWTP 75 

BOD5 11/30/2004 2.8 2.4 

BOD5 12/31/2004 2.9 2.6 

BOD5 01/31/2005 5.4 3.3 

BOD5 02/28/2005 2.7 2.5 

BOD5 03/31/2005 4.4 3.8 

BOD5 04/30/2005 2.5 2.3 

BOD5 05/31/2005 2.8 2.2 

BOD5 06/30/2005 3.9 2.5 

BOD5 07/31/2005 4.9 3.6 

BOD5 08/31/2005 3.0 2.2 

BOD5 09/30/2005 4.7 3.7 

BOD5 10/31/2005 5.8 4.2 

BOD5 11/30/2005 6.3 5.5 

BOD5 12/31/2005 2.8 2.5 

BOD5 01/31/2006 6.7 5.0 

BOD5 02/28/2006 5.7 3.5 

BOD5 03/31/2006 3.5 2.9 

BOD5 04/30/2006 4.0 2.7 

BOD5 05/31/2006 3.0 3.0 

BOD5 06/30/2006 4.0 5.0 

BOD5 07/31/2006 7.0 5.6 

BOD5 08/31/2006 3.5 3.0 

BOD5 09/30/2006 5.3 3.6 

BOD5 10/31/2006 4.7 3.5 
Permit No.: WA0037168 

City of Puyallup WWTP 76 

BOD5 11/30/2006 3.2 4.9 

BOD5 12/31/2006 4.5 6.4 

BOD5 01/31/2007 6.3 16.0 

BOD5 02/28/2007 4.7 7.1 

BOD5 03/31/2007 7.5 5.5 

BOD5 04/30/2007 3.2 3.5 

BOD5 05/31/2007 2.7 1.9 

BOD5 06/30/2007 2.0 2.5 

BOD5 07/31/2007 3.3 2.9 

BOD5 08/31/2007 2.9 3.5 

BOD5 09/30/2007 3.4 4.3 

BOD5 10/31/2007 3.8 5.3 

BOD5 11/30/2007 3.8 4.4 

BOD5 12/31/2007 4.8 7.0 

BOD5 01/31/2008 4.2 4.7 

BOD5 02/29/2008 4.5 5.5 

BOD5 03/31/2008 3.4 3.8 

BOD5 10/31/2008 2.5 3.0 

BOD5 11/30/2008 2.9 3.3 

BOD5 12/31/2008 3.7 5.0 

BOD5 1/31/2009 5.3 6.5 

BOD5 3/31/2009 3.3 3.7 

BOD5 1/31/2010 4.6 5.8 

BOD5 2/28/2010 2.7 3.1 
Permit No.: WA0037168 

City of Puyallup WWTP 77 

BOD5 3/31/2010 2.5 3.4 

BOD5 4/30/2010 3.5 4.0 

BOD5 5/31/2010 3.4 4.2 

BOD5 6/30/2010 2.5 2.7 

BOD5 7/31/2010 2.7 3.7 

BOD5 8/31/2010 2.6 3.5 

BOD5 9/30/2010 2.9 3.4 

BOD5 10/31/2010 3.1 3.8 

BOD5 11/30/2010 3.7 4.0 

BOD5 12/31/2010 3.9 4.9 

BOD5 1/31/2011 4.0 5.1 

BOD5 2/28/2011 3.4 3.7 

BOD5 3/31/2011 3.5 4.2 

BOD5 4/30/2011 4.0 4.8 

BOD5 5/31/2011 3.5 5.9 

BOD5 6/30/2011 3.5 4.6 

BOD5 7/31/2011 2.7 3.1 

BOD5 8/31/2011 2.2 2.6 

BOD5 9/30/2011 2.4 2.9 

BOD5 10/31/2011 4.5 6.4 

BOD5 11/30/2011 3.7 4.5 

BOD5 12/31/2011 3.0 3.2 

BOD5, % REMOVAL 08/31/2003 99.0 

BOD5, % REMOVAL 09/30/2003 99.0 
Permit No.: WA0037168 

City of Puyallup WWTP 78 

BOD5, % REMOVAL 10/31/2003 98.0 

BOD5, % REMOVAL 11/30/2003 99.0 

BOD5, % REMOVAL 12/31/2003 96.0 

BOD5, % REMOVAL 01/31/2004 97.0 

BOD5, % REMOVAL 02/29/2004 98.0 

BOD5, % REMOVAL 03/31/2004 98.0 

BOD5, % REMOVAL 04/30/2004 98.0 

BOD5, % REMOVAL 05/31/2004 99.0 

BOD5, % REMOVAL 06/30/2004 99.0 

BOD5, % REMOVAL 07/31/2004 99.0 

BOD5, % REMOVAL 08/31/2004 98.0 

BOD5, % REMOVAL 09/30/2004 99.0 

BOD5, % REMOVAL 10/31/2004 99.0 

BOD5, % REMOVAL 11/30/2004 99.0 

BOD5, % REMOVAL 12/31/2004 99.0 

BOD5, % REMOVAL 01/31/2005 99.0 

BOD5, % REMOVAL 02/28/2005 99.0 

BOD5, % REMOVAL 04/30/2005 99.0 

BOD5, % REMOVAL 05/31/2005 99.0 

BOD5, % REMOVAL 06/30/2005 99.0 

BOD5, % REMOVAL 07/31/2005 99.0 

BOD5, % REMOVAL 08/31/2005 99.0 

BOD5, % REMOVAL 09/30/2005 99.0 

BOD5, % REMOVAL 10/31/2005 99.0 
Permit No.: WA0037168 

City of Puyallup WWTP 79 

BOD5, % REMOVAL 11/30/2005 98.0 

BOD5, % REMOVAL 12/31/2005 99.0 

BOD5, % REMOVAL 01/31/2006 94.0 

BOD5, % REMOVAL 02/28/2006 98.0 

BOD5, % REMOVAL 03/31/2006 97.0 

BOD5, % REMOVAL 04/30/2006 99.0 

BOD5, % REMOVAL 05/31/2006 98.0 

BOD5, % REMOVAL 06/30/2006 98.0 

BOD5, % REMOVAL 07/31/2006 98.0 

BOD5, % REMOVAL 08/31/2006 99.0 

BOD5, % REMOVAL 09/30/2006 98.1 

BOD5, % REMOVAL 10/31/2006 98.6 

BOD5, % REMOVAL 11/30/2006 96.0 

BOD5, % REMOVAL 12/31/2006 94.4 

BOD5, % REMOVAL 01/31/2007 95.0 

BOD5, % REMOVAL 02/28/2007 97.4 

BOD5, % REMOVAL 03/31/2007 96.6 

BOD5, % REMOVAL 04/30/2007 98.5 

BOD5, % REMOVAL 05/31/2007 99.3 

BOD5, % REMOVAL 06/30/2007 99.3 

BOD5, % REMOVAL 07/31/2007 99.0 

BOD5, % REMOVAL 08/31/2007 99.0 

BOD5, % REMOVAL 09/30/2007 99.0 

BOD5, % REMOVAL 10/31/2007 98.5 
Permit No.: WA0037168 

City of Puyallup WWTP 80 

BOD5, % REMOVAL 11/30/2007 98.0 

BOD5, % REMOVAL 12/31/2007 92.7 

BOD5, % REMOVAL 01/31/2008 97.1 

BOD5, % REMOVAL 02/29/2008 97.6 

BOD5, % REMOVAL 03/31/2008 98.3 

BOD5, % REMOVAL 04/30/2008 98.4 

BOD5, % REMOVAL 05/31/2008 99.0 

BOD5, % REMOVAL 06/30/2008 99.0 

BOD5, % REMOVAL 07/31/2008 98.9 

BOD5, % REMOVAL 08/31/2008 99.2 

BOD5, % REMOVAL 09/30/2008 99.3 

BOD5, % REMOVAL 10/31/2008 99.2 

BOD5, % REMOVAL 11/30/2008 98.6 

BOD5, % REMOVAL 12/31/2008 98.6 

BOD5, % REMOVAL 1/31/2009 96.9 

BOD5, % REMOVAL 2/28/2009 98.2 

BOD5, % REMOVAL 3/31/2009 98.2 

BOD5, % REMOVAL 3/31/2009 98.2 

BOD5, % REMOVAL 4/30/2009 98.2 

BOD5, % REMOVAL 5/31/2009 98.9 

BOD5, % REMOVAL 6/30/2009 99.3 

BOD5, % REMOVAL 7/31/2009 99.2 

BOD5, % REMOVAL 8/31/2009 98.8 

BOD5, % REMOVAL 9/30/2009 98.8 
Permit No.: WA0037168 

City of Puyallup WWTP 81 

BOD5, % REMOVAL 10/13/2009 98.8 

BOD5, % REMOVAL 10/31/2009 99.1 

BOD5, % REMOVAL 11/30/2009 98.6 

BOD5, % REMOVAL 12/31/2009 98.5 

BOD5, % REMOVAL 1/31/2010 96.8 

BOD5, % REMOVAL 1/31/2010 96.8 

BOD5, % REMOVAL 2/28/2010 98.6 

BOD5, % REMOVAL 2/28/2010 98.6 

BOD5, % REMOVAL 3/31/2010 98.6 

BOD5, % REMOVAL 4/30/2010 98.3 

BOD5, % REMOVAL 5/31/2010 98.7 

BOD5, % REMOVAL 5/31/2010 98.3 

BOD5, % REMOVAL 6/30/2010 99.0 

BOD5, % REMOVAL 6/30/2010 98.9 

BOD5, % REMOVAL 7/31/2010 99.1 

BOD5, % REMOVAL 8/31/2010 99.1 

BOD5, % REMOVAL 9/30/2010 99.1 

BOD5, % REMOVAL 10/31/2010 99.9 

BOD5, % REMOVAL 11/30/2010 98.1 

BOD5, % REMOVAL 12/31/2010 97.4 

BOD5, % REMOVAL 1/31/2011 97.8 

BOD5, % REMOVAL 2/28/2011 98.2 

BOD5, % REMOVAL 3/31/2011 97.6 

BOD5, % REMOVAL 4/30/2011 97.3 
Permit No.: WA0037168 

City of Puyallup WWTP 82 

BOD5, % REMOVAL 5/31/2011 97.9 

BOD5, % REMOVAL 6/30/2011 98.5 

BOD5, % REMOVAL 7/31/2011 99.0 

BOD5, % REMOVAL 8/31/2011 99.2 

BOD5, % REMOVAL 9/30/2011 99.2 

BOD5, % REMOVAL 10/31/2011 98.3 

BOD5, % REMOVAL 11/30/2011 98.4 

BOD5, % REMOVAL 12/31/2011 98.9 

COPPER (total recoverable)08/31/2003 7.2 7.2 

COPPER (total recoverable)09/30/2003 11. 11. 

COPPER (total recoverable)10/31/2003 10.6 10.6 

COPPER (total recoverable)11/30/2003 9.8 9.8 

COPPER (total recoverable)12/31/2003 10.7 10.5 

COPPER (total recoverable)01/31/2004 12. 12. 

COPPER (total recoverable)02/29/2004 9.7 9.7 

COPPER (total recoverable)03/31/2004 8.1 8.1 

COPPER (total recoverable)04/30/2004 10.9 10.7 

COPPER (total recoverable)05/31/2004 10.8 10.8 

COPPER (total recoverable)06/30/2004 13.4 13.4 

COPPER (total recoverable)07/31/2004 10.5 6.1 

COPPER (total recoverable)08/31/2004 11.8 11.8 

COPPER (total recoverable)09/30/2004 . . 

COPPER (total recoverable)10/31/2004 12.2 12.2 

COPPER (total recoverable)11/30/2004 15.3 14.9 
Permit No.: WA0037168 

City of Puyallup WWTP 83 

COPPER (total recoverable)12/31/2004 13.4 13.4 

COPPER (total recoverable)01/31/2005 13.8 13.8 

COPPER (total recoverable)02/28/2005 12.3 12.3 

COPPER (total recoverable)03/31/2005 15.2 15.1 

COPPER (total recoverable)04/30/2005 12. 12. 

COPPER (total recoverable)05/31/2005 9.6 9.6 

COPPER (total recoverable)06/30/2005 12.5 12.5 

COPPER (total recoverable)07/31/2005 22.3 22.3 

COPPER (total recoverable)08/31/2005 16.3 16.3 

COPPER (total recoverable)09/30/2005 17.4 17.4 

COPPER (total recoverable)10/31/2005 18.5 18.5 

COPPER (total recoverable)11/30/2005 . . 

COPPER (total recoverable)12/31/2005 15.6 15.6 

COPPER (total recoverable)01/31/2006 10.1 10.1 

COPPER (total recoverable)02/28/2006 14.7 13.1 

COPPER (total recoverable)03/31/2006 14.4 13.2 

COPPER (total recoverable)04/30/2006 14.8 14.2 

COPPER (total recoverable)05/31/2006 17.1 16.4 

COPPER (total recoverable)06/30/2006 18.4 18.4 

COPPER (total recoverable)07/31/2006 20.9 20.9 

COPPER (total recoverable)08/31/2006 14.6 14.6 

COPPER (total recoverable)09/30/2006 13.8 13.8 

COPPER (total recoverable)10/31/2006 14.9 14.9 

COPPER (total recoverable)11/30/2006 17.9 17.9 
Permit No.: WA0037168 

City of Puyallup WWTP 84 

COPPER (total recoverable)12/31/2006 12.4 12.4 

COPPER (total recoverable)01/31/2007 9. 9. 

COPPER (total recoverable)02/28/2007 15.5 15.5 

COPPER (total recoverable)03/31/2007 12.4 11.7 

COPPER (total recoverable)04/30/2007 12.7 12.7 

COPPER (total recoverable)05/31/2007 4.5 4.5 

COPPER (total recoverable)06/30/2007 3.7 3.7 

COPPER (total recoverable)07/31/2007 3.6 3. 

COPPER (total recoverable)08/31/2007 3.1 3.1 

COPPER (total recoverable)09/30/2007 5.5 5.5 

COPPER (total recoverable)10/31/2007 7.7 6.5 

COPPER (total recoverable)11/30/2007 4.2 4.2 

COPPER (total recoverable)12/31/2007 6. 6. 

COPPER (total recoverable)01/31/2008 3.9 3.9 

COPPER (total recoverable)02/29/2008 4.3 4.3 

COPPER (total recoverable)03/31/2008 7.1 5.2 

COPPER (total recoverable)08/31/2003 7.2 7.2 

COPPER (total recoverable)09/30/2003 11. 11. 

COPPER (total recoverable)10/31/2003 10.6 10.6 

COPPER (total recoverable)11/30/2003 9.8 9.8 

COPPER (total recoverable)12/31/2003 10.7 10.5 

COPPER (total recoverable)01/31/2004 12. 12. 

COPPER (total recoverable)02/29/2004 9.7 9.7 

COPPER (total recoverable)03/31/2004 8.1 8.1 
Permit No.: WA0037168 

City of Puyallup WWTP 85 

COPPER (total recoverable)04/30/2004 10.9 10.7 

COPPER (total recoverable)05/31/2004 10.8 10.8 

COPPER (total recoverable)06/30/2004 13.4 13.4 

COPPER (total recoverable)07/31/2004 10.5 6.1 

COPPER (total recoverable)08/31/2004 11.8 11.8 

COPPER (total recoverable)09/30/2004 . . 

COPPER (total recoverable)10/31/2004 12.2 12.2 

COPPER (total recoverable)11/30/2004 15.3 14.9 

COPPER (total recoverable)12/31/2004 13.4 13.4 

COPPER (total recoverable)01/31/2005 13.8 13.8 

COPPER (total recoverable)02/28/2005 12.3 12.3 

COPPER (total recoverable)03/31/2005 15.2 15.1 

COPPER (total recoverable)04/30/2005 12. 12. 

COPPER (total recoverable)05/31/2005 9.6 9.6 

COPPER (total recoverable)06/30/2005 12.5 12.5 

COPPER (total recoverable)07/31/2005 22.3 22.3 

COPPER (total recoverable)08/31/2005 16.3 16.3 

COPPER (total recoverable)09/30/2005 17.4 17.4 

COPPER (total recoverable)10/31/2005 18.5 18.5 

COPPER (total recoverable)11/30/2005 . . 

COPPER (total recoverable)12/31/2005 15.6 15.6 

COPPER (total recoverable)01/31/2006 10.1 10.1 

COPPER (total recoverable)02/28/2006 14.7 13.1 

COPPER (total recoverable)03/31/2006 14.4 13.2 
Permit No.: WA0037168 

City of Puyallup WWTP 86 

COPPER (total recoverable)04/30/2006 14.8 14.2 

COPPER (total recoverable)05/31/2006 17.1 16.4 

COPPER (total recoverable)06/30/2006 18.4 18.4 

COPPER (total recoverable)07/31/2006 20.9 20.9 

COPPER (total recoverable)08/31/2006 14.6 14.6 

COPPER (total recoverable)09/30/2006 13.8 13.8 

COPPER (total recoverable)10/31/2006 14.9 14.9 

COPPER (total recoverable)11/30/2006 17.9 17.9 

COPPER (total recoverable)12/31/2006 12.4 12.4 

COPPER (total recoverable)01/31/2007 9. 9. 

COPPER (total recoverable)02/28/2007 15.5 15.5 

COPPER (total recoverable)03/31/2007 12.4 11.7 

COPPER (total recoverable)04/30/2007 12.7 12.7 

COPPER (total recoverable)05/31/2007 4.5 4.5 

COPPER (total recoverable)06/30/2007 3.7 3.7 

COPPER (total recoverable)07/31/2007 3.6 3. 

COPPER (total recoverable)08/31/2007 3.1 3.1 

COPPER (total recoverable)09/30/2007 5.5 5.5 

COPPER (total recoverable)10/31/2007 7.7 6.5 

COPPER (total recoverable)11/30/2007 4.2 4.2 

COPPER (total recoverable)12/31/2007 6. 6. 

COPPER (total recoverable)01/31/2008 3.9 3.9 

COPPER (total recoverable)02/29/2008 4.3 4.3 

COPPER (total recoverable)03/31/2008 7.1 5.2 
Permit No.: WA0037168 

City of Puyallup WWTP 87 

COPPER (total recoverable)04/30/2008 2.8 2.8 

COPPER (total recoverable)05/31/2008 2.6 2.6 

COPPER (total recoverable)06/30/2008 2.9 2.9 

COPPER (total recoverable)07/31/2008 3.4 3.4 

COPPER (total recoverable)08/31/2008 2.8 2.8 

COPPER (total recoverable)09/30/2008 2.9 2.9 

COPPER (total recoverable)10/31/2008 2.8 2.8 

COPPER (total recoverable)11/30/2008 4.1 4.1 

COPPER (total recoverable)12/31/2008 4.2 4.2 

COPPER (total recoverable)01/31/2009 4.3 4.3 

COPPER (total recoverable)02/28/2009 3.2 3.2 

COPPER (total recoverable)03/31/2009 2.8 2,8 

COPPER (total recoverable)04/31/2009 3.7 3.7 

COPPER (total recoverable)05/31/2009 4.4 4.4 

COPPER (total recoverable)06/30/2009 3.9 3.9 

COPPER (total recoverable)07/31/2009 2.6 2.6 

COPPER (total recoverable)08/31/2009 3.8 3.8 

COPPER (total recoverable)09/30/2009 4.2 4.2 

COPPER (total recoverable)10/31/2009 7.7 7.7 

COPPER (total recoverable)11/30/2009 3.4 3.4 

COPPER (total recoverable)01/31/2010 5 5 

COPPER (total recoverable)01/31/2010 7.7 7.7 

COPPER (total recoverable)02/28/2010 5 5 

COPPER (total recoverable)03/31/2010 4.9 4.9 
Permit No.: WA0037168 

City of Puyallup WWTP 88 

COPPER (total recoverable)04/30/2010 7.5 7.5 

COPPER (total recoverable)05/31/2010 4.4 4.4 

COPPER (total recoverable)06/30/2010 2.7 2.7 

COPPER (total recoverable)07/31/2010 3.1 3.1 

COPPER (total recoverable)08/31/2010 3.8 3.8 

COPPER (total recoverable)09/30/2010 4.2 4.2 

COPPER (total recoverable)10/31/2010 5.2 5.2 

COPPER (total recoverable)11/30/2010 6.4 6.4 

COPPER (total recoverable)12/31/2010 4.9 4.9 

COPPER (total recoverable)01/31/2011 4.9 4.9 

COPPER (total recoverable)02/28/2011 4.4 4.4 

COPPER (total recoverable)03/31/2011 4.8 4.8 

COPPER (total recoverable)04/30/2011 8.1 8.1 

COPPER (total recoverable)05/31/2011 6.4 6.4 

COPPER (total recoverable)06/30/2011 6.3 6.3 

COPPER (total recoverable)07/31/2011 4 4 

COPPER (total recoverable)08/31/2011 4 4 

COPPER (total recoverable)09/30/2011 3.5 3.5 

COPPER (total recoverable)10/31/2011 6.7 6.7 

COPPER (total recoverable)11/30/2011 6.1 6.1 

COPPER (total recoverable)12/31/2011 5.4 5.4 

COPPER (total recoverable)01/31/2012 5.9 5.9 

COPPER (total recoverable)02/29/2012 6.1 6.1 

COPPER (total recoverable)03/31/2012 5.9 5.9 
Permit No.: WA0037168 

City of Puyallup WWTP 89 

COPPER (total recoverable)04/30/2012 4.8 4.8 

COPPER (total recoverable)05/31/2012 5 5 

COPPER (total recoverable)06/30/2012 3.4 3.4 

COPPER (total recoverable)07/31/2012 5.9 5.9 

COPPER (total recoverable)08/31/2012 5.2 5.2 

COPPER (total recoverable)09/30/2012 5.2 5.2 

COPPER (total recoverable)10/31/2012 4.8 4.8 

COPPER (total recoverable)11/30/2012 4.3 4.3 

COPPER (total recoverable)12/31/2012 5.6 5.6 

COPPER (total recoverable)01/31/2013 6 6 

COPPER (total recoverable)02/28/2013 5.9 5.9 

COPPER (total recoverable)03/31/2013 6.9 6.9 
Permit No.: WA0037168 

City of Puyallup WWTP 90 

FECAL COLIFORM 08/31/2003 53.0 

FECAL COLIFORM 09/30/2003 54.0 

FECAL COLIFORM 10/31/2003 25.0 

FECAL COLIFORM 11/30/2003 14.0 

FECAL COLIFORM 12/31/2003 32.0 

FECAL COLIFORM 01/31/2004 8.0 

FECAL COLIFORM 02/29/2004 9.0 

FECAL COLIFORM 03/31/2004 13.0 

FECAL COLIFORM 04/30/2004 10.0 

FECAL COLIFORM 05/31/2004 25.0 

FECAL COLIFORM 06/30/2004 9.0 

FECAL COLIFORM 07/31/2004 20.0 

FECAL COLIFORM 08/31/2004 47.0 

FECAL COLIFORM 09/30/2004 8.0 

FECAL COLIFORM 10/31/2004 5.0 

FECAL COLIFORM 11/30/2004 8.0 

FECAL COLIFORM 12/31/2004 3.0 

FECAL COLIFORM 01/31/2005 11.0 

FECAL COLIFORM 02/28/2005 2.0 

FECAL COLIFORM 03/31/2005 6.0 

FECAL COLIFORM 04/30/2005 6.0 

FECAL COLIFORM 05/31/2005 6.0 

FECAL COLIFORM 06/30/2005 4.0 
Permit No.: WA0037168 

City of Puyallup WWTP 91 

FECAL COLIFORM 07/31/2005 9.0 

FECAL COLIFORM 08/31/2005 9.0 

FECAL COLIFORM 09/30/2005 31.0 

FECAL COLIFORM 10/31/2005 55.0 

FECAL COLIFORM 11/30/2005 18.0 

FECAL COLIFORM 12/31/2005 6.0 

FECAL COLIFORM 01/31/2006 8.0 

FECAL COLIFORM 02/28/2006 9.0 

FECAL COLIFORM 03/31/2006 9.0 

FECAL COLIFORM 04/30/2006 2.0 

FECAL COLIFORM 05/31/2006 5.0 

FECAL COLIFORM 06/30/2006 19.0 

FECAL COLIFORM 07/31/2006 21.0 

FECAL COLIFORM 08/31/2006 9.0 

FECAL COLIFORM 09/30/2006 12.0 

FECAL COLIFORM 10/31/2006 4.0 

FECAL COLIFORM 11/30/2006 4.3 

FECAL COLIFORM 12/31/2006 10.3 

FECAL COLIFORM 01/31/2007 4.7 

FECAL COLIFORM 02/28/2007 6.3 

FECAL COLIFORM 03/31/2007 0.0 

FECAL COLIFORM 04/30/2007 7.9 

FECAL COLIFORM 05/31/2007 6.5 

FECAL COLIFORM 06/30/2007 10.6 
Permit No.: WA0037168 

City of Puyallup WWTP 92 

FECAL COLIFORM 07/31/2007 18.9 

FECAL COLIFORM 08/31/2007 9.9 

FECAL COLIFORM 09/30/2007 7.4 

FECAL COLIFORM 10/31/2007 3.2 

FECAL COLIFORM 11/30/2007 0.0 

FECAL COLIFORM 12/31/2007 0.0 

FECAL COLIFORM 01/31/2008 0.0 

FECAL COLIFORM 02/29/2008 4.4 

FECAL COLIFORM 03/31/2008 2.5 

FECAL COLIFORM 04/30/2008 2.9 

FECAL COLIFORM 05/31/2008 3.2 

FECAL COLIFORM 06/30/2008 3.2 

FECAL COLIFORM 07/31/2008 2.9 

FECAL COLIFORM 08/31/2008 3.6 

FECAL COLIFORM 09/30/2008 4.6 

FECAL COLIFORM 10/31/2008 7.6 

FECAL COLIFORM 11/30/2008 3.6 

FECAL COLIFORM 12/31/2008 2.7 

FECAL COLIFORM 1/31/2009 12.8 

FECAL COLIFORM 2/28/2009 6.0 

FECAL COLIFORM 3/31/2009 2.6 

FECAL COLIFORM 4/30/2009 3.9 

FECAL COLIFORM 5/31/2009 4.0 

FECAL COLIFORM 6/30/2009 12.0 
Permit No.: WA0037168 

City of Puyallup WWTP 93 

FECAL COLIFORM 7/31/2009 14.8 

FECAL COLIFORM 8/31/2009 18.2 

FECAL COLIFORM 9/30/2009 4.0 

FECAL COLIFORM 10/13/2009 4.0 

FECAL COLIFORM 10/31/2009 3.1 

FECAL COLIFORM 11/30/2009 5.0 

FECAL COLIFORM 12/31/2009 6.4 

FECAL COLIFORM 1/31/2010 11.1 

FECAL COLIFORM 2/28/2010 3.2 

FECAL COLIFORM 3/31/2010 5.7 

FECAL COLIFORM 4/30/2010 7.4 

FECAL COLIFORM 5/31/2010 38.7 

FECAL COLIFORM 6/30/2010 14.5 

FECAL COLIFORM 7/31/2010 5.7 

FECAL COLIFORM 8/31/2010 9.5 

FECAL COLIFORM 9/30/2010 10.0 

FECAL COLIFORM 10/31/2010 8.6 

FECAL COLIFORM 11/30/2010 56.8 

FECAL COLIFORM 12/31/2010 40.4 

FECAL COLIFORM 1/31/2011 12.1 

FECAL COLIFORM 2/28/2011 33.1 

FECAL COLIFORM 3/31/2011 8.9 

FECAL COLIFORM 4/30/2011 15.3 

FECAL COLIFORM 5/31/2011 11.2 
Permit No.: WA0037168 

City of Puyallup WWTP 94 

FECAL COLIFORM 6/30/2011 20.2 

FECAL COLIFORM 7/31/2011 8.8 

FECAL COLIFORM 8/31/2011 13.3 

FECAL COLIFORM 9/30/2011 18.4 

FECAL COLIFORM 10/31/2011 18.7 

FECAL COLIFORM 11/30/2011 28.8 

FECAL COLIFORM 12/31/2011 4.1 

LEAD (total recoverable) 08/31/2003 0.6 0.6 

LEAD (total recoverable) 09/30/2003 0.6 0.6 

LEAD (total recoverable) 10/31/2003 0.8 0.8 

LEAD (total recoverable) 11/30/2003 0.5 0.5 

LEAD (total recoverable) 12/31/2003 0.4 0.4 

LEAD (total recoverable) 01/31/2004 0.3 0.3 

LEAD (total recoverable) 02/29/2004 0.3 0.3 

LEAD (total recoverable) 03/31/2004 0.3 0.3 

LEAD (total recoverable) 04/30/2004 0.3 0.3 

LEAD (total recoverable) 05/31/2004 0.5 0.5 

LEAD (total recoverable) 06/30/2004 0.2 0.2 

LEAD (total recoverable) 07/31/2004 0.3 0.3 

LEAD (total recoverable) 08/31/2004 0.3 0.3 

LEAD (total recoverable) 09/30/2004 0.0 0.0 

LEAD (total recoverable) 10/31/2004 0.3 0.3 

LEAD (total recoverable) 11/30/2004 0.4 0.4 

LEAD (total recoverable) 12/31/2004 0.2 0.2 
Permit No.: WA0037168 

City of Puyallup WWTP 95 

LEAD (total recoverable) 01/31/2005 0.2 0.2 

LEAD (total recoverable) 02/28/2005 0.2 0.2 

LEAD (total recoverable) 03/31/2005 0.3 0.3 

LEAD (total recoverable) 04/30/2005 0.3 0.3 

LEAD (total recoverable) 05/31/2005 0.2 0.2 

LEAD (total recoverable) 06/30/2005 0.3 0.3 

LEAD (total recoverable) 07/31/2005 0.6 0.6 

LEAD (total recoverable) 08/31/2005 0.5 0.5 

LEAD (total recoverable) 09/30/2005 0.4 0.4 

LEAD (total recoverable) 10/31/2005 0.5 0.5 

LEAD (total recoverable) 11/30/2005 0.0 0.0 

LEAD (total recoverable) 12/31/2005 0.3 0.3 

LEAD (total recoverable) 01/31/2006 0.2 0.2 

LEAD (total recoverable) 02/28/2006 0.2 0.2 

LEAD (total recoverable) 03/31/2006 0.4 0.4 

LEAD (total recoverable) 04/30/2006 0.3 0.4 

LEAD (total recoverable) 05/31/2006 0.3 0.4 

LEAD (total recoverable) 06/30/2006 0.4 0.4 

LEAD (total recoverable) 07/31/2006 0.4 0.4 

LEAD (total recoverable) 08/31/2006 0.4 0.4 

LEAD (total recoverable) 09/30/2006 0.3 0.3 

LEAD (total recoverable) 10/31/2006 0.4 0.4 

LEAD (total recoverable) 11/30/2006 1.0 1.0 

LEAD (total recoverable) 12/31/2006 0.5 0.5 
Permit No.: WA0037168 

City of Puyallup WWTP 96 

LEAD (total recoverable) 01/31/2007 0.4 0.4 

LEAD (total recoverable) 02/28/2007 0.4 0.4 

LEAD (total recoverable) 03/31/2007 0.4 0.6 

LEAD (total recoverable) 04/30/2007 0.3 0.3 

LEAD (total recoverable) 05/31/2007 0.7 0.7 

LEAD (total recoverable) 06/30/2007 0.3 0.3 

LEAD (total recoverable) 07/31/2007 0.3 0.4 

LEAD (total recoverable) 08/31/2007 0.8 0.8 

LEAD (total recoverable) 09/30/2007 0.3 0.3 

LEAD (total recoverable) 10/31/2007 0.5 0.6 

LEAD (total recoverable) 11/30/2007 0.4 0.4 

LEAD (total recoverable) 12/31/2007 0.7 0.7 

LEAD (total recoverable) 01/31/2008 0.4 0.4 

LEAD (total recoverable) 02/29/2008 0.3 0.3 

LEAD (total recoverable) 03/31/2008 0.4 0.6 

LEAD (total recoverable) 04/30/2008 0.5 0.5 

LEAD (total recoverable) 05/31/2008 0.3 0.3 

LEAD (total recoverable) 06/30/2008 0.2 0.2 

LEAD (total recoverable) 07/31/2008 0.4 0.4 

LEAD (total recoverable) 08/31/2008 0.3 0.3 

LEAD (total recoverable) 09/30/2008 0.2 0.2 

LEAD (total recoverable) 10/31/2008 0.6 0.6 

LEAD (total recoverable) 11/30/2008 0.4 0.4 

LEAD (total recoverable) 12/31/2008 0.4 0.4 
Permit No.: WA0037168 

City of Puyallup WWTP 97 

LEAD (total recoverable) 1/31/2009 0.4 0.4 

LEAD (total recoverable) 2/28/2009 0.6 0.6 

LEAD (total recoverable) 3/31/2009 0.6 1.1 

LEAD (total recoverable) 4/30/2009 0.7 0.7 

LEAD (total recoverable) 5/31/2009 0.3 0.3 

LEAD (total recoverable) 6/30/2009 0.8 0.8 

LEAD (total recoverable) 7/31/2009 0.6 0.6 

LEAD (total recoverable) 8/31/2009 0.3 0.3 

LEAD (total recoverable) 9/30/2009 0.3 0.3 

LEAD (total recoverable) 10/13/2009 0.3 0.3 

LEAD (total recoverable) 10/31/2009 0.4 0.4 

LEAD (total recoverable) 11/30/2009 0.2 0.2 

LEAD (total recoverable) 12/31/2009 0.2 0.2 

LEAD (total recoverable) 1/31/2010 0.3 0.3 

LEAD (total recoverable) 2/28/2010 0.2 0.2 

LEAD (total recoverable) 3/31/2010 0.1 0.2 

LEAD (total recoverable) 4/30/2010 0.2 0.2 

LEAD (total recoverable) 5/31/2010 0.3 0.3 

LEAD (total recoverable) 6/30/2010 0.1 0.1 

LEAD (total recoverable) 7/31/2010 0.2 0.2 

LEAD (total recoverable) 8/31/2010 0.2 0.2 

LEAD (total recoverable) 9/30/2010 0.3 0.3 

LEAD (total recoverable) 10/31/2010 0.3 0.3 

LEAD (total recoverable) 11/30/2010 0.2 0.2 
Permit No.: WA0037168 

City of Puyallup WWTP 98 

LEAD (total recoverable) 12/31/2010 0.3 0.3 

LEAD (total recoverable) 1/31/2011 0.3 0.3 

LEAD (total recoverable) 2/28/2011 0.3 0.3 

LEAD (total recoverable) 3/31/2011 0.2 0.2 

LEAD (total recoverable) 4/30/2011 0.3 0.3 

LEAD (total recoverable) 5/31/2011 0.2 0.2 

LEAD (total recoverable) 6/30/2011 0.2 0.2 

LEAD (total recoverable) 7/31/2011 0.4 0.1 

LEAD (total recoverable) 8/31/2011 0.2 0.2 

LEAD (total recoverable) 9/30/2011 0.2 0.2 

LEAD (total recoverable) 10/31/2011 0.2 0.2 

LEAD (total recoverable) 11/30/2011 0.2 0.2 

LEAD (total recoverable) 12/31/2011 0.2 0.2 

MERCURY (total recoverable)08/31/2003 0.00520.0052 

MERCURY (total recoverable)09/30/2003 0.00220.0022 

MERCURY (total recoverable)10/31/2003 0.01230.0123 

MERCURY (total recoverable)11/30/2003 0.00400.0040 

MERCURY (total recoverable)12/31/2003 0.00530.0077 

MERCURY (total recoverable)01/31/2004 0.00580.0058 

MERCURY (total recoverable)02/29/2004 0.00320.0032 

MERCURY (total recoverable)03/31/2004 0.00370.0037 

MERCURY (total recoverable)04/30/2004 0.00260.0026 

MERCURY (total recoverable)05/31/2004 0.00580.0058 

MERCURY (total recoverable)06/30/2004 0.00320.0032 
Permit No.: WA0037168 

City of Puyallup WWTP 99 

MERCURY (total recoverable)07/31/2004 0.00220.0022 

MERCURY (total recoverable)08/31/2004 0.00210.0021 

MERCURY (total recoverable)09/30/2004 0.00280.0028 

MERCURY (total recoverable)10/31/2004 0.00180.0018 

MERCURY (total recoverable)11/30/2004 0.00370.0045 

MERCURY (total recoverable)12/31/2004 0.00240.0024 

MERCURY (total recoverable)01/31/2005 0.00170.0017 

MERCURY (total recoverable)02/28/2005 0.00170.0017 

MERCURY (total recoverable)03/31/2005 0.00240.0026 

MERCURY (total recoverable)04/30/2005 0.00330.0033 

MERCURY (total recoverable)05/31/2005 0.00130.0013 

MERCURY (total recoverable)06/30/2005 0.00200.0020 

MERCURY (total recoverable)07/31/2005 0.00590.0059 

MERCURY (total recoverable)08/31/2005 0.00250.0025 

MERCURY (total recoverable)09/30/2005 0.00290.0029 

MERCURY (total recoverable)10/31/2005 0.00390.0039 

MERCURY (total recoverable)11/30/2005 0.00000.0000 

MERCURY (total recoverable)12/31/2005 0.00340.0034 

MERCURY (total recoverable)01/31/2006 0.00020.0024 

MERCURY (total recoverable)02/28/2006 0.00180.0018 

MERCURY (total recoverable)03/31/2006 0.00330.0033 

MERCURY (total recoverable)04/30/2006 0.00170.0019 

MERCURY (total recoverable)05/31/2006 0.00150.0015 

MERCURY (total recoverable)06/30/2006 0.00300.0030 
Permit No.: WA0037168 

City of Puyallup WWTP 100 

MERCURY (total recoverable)07/31/2006 0.00400.0040 

MERCURY (total recoverable)08/31/2006 0.00180.0018 

MERCURY (total recoverable)09/30/2006 0.00110.0011 

MERCURY (total recoverable)10/31/2006 0.00110.0011 

MERCURY (total recoverable)11/30/2006 0.00220.0022 

MERCURY (total recoverable)01/31/2007 0.00230.0023 

MERCURY (total recoverable)02/28/2007 0.00410.0041 

MERCURY (total recoverable)03/31/2007 0.00210.0023 

MERCURY (total recoverable)04/30/2007 0.00270.0027 

MERCURY (total recoverable)05/31/2007 0.00140.0014 

MERCURY (total recoverable)06/30/2007 0.00120.0012 

MERCURY (total recoverable)07/31/2007 0.00110.0012 

MERCURY (total recoverable)09/30/2007 0.00120.0012 

MERCURY (total recoverable)10/31/2007 0.00230.0029 

MERCURY (total recoverable)11/30/2007 0.00170.0017 

MERCURY (total recoverable)12/31/2007 0.00320.0032 

MERCURY (total recoverable)01/31/2008 0.00200.0020 

MERCURY (total recoverable)02/29/2008 0.00200.0020 

MERCURY (total recoverable)03/31/2008 0.00000.0000 

MERCURY (total recoverable)04/30/2008 0.00000.0000 

MERCURY (total recoverable)05/31/2008 0.01760.0176 

MERCURY (total recoverable)06/30/2008 0.00140.0014 

MERCURY (total recoverable)08/31/2008 0.00000.0000 

MERCURY (total recoverable)09/30/2008 0.00150.0015 
Permit No.: WA0037168 

City of Puyallup WWTP 101 

MERCURY (total recoverable)11/30/2008 0.00130.0013 

MERCURY (total recoverable)1/31/2009 0.00210.0021 

MERCURY (total recoverable)2/28/2009 0.00000.0001 

MERCURY (total recoverable)3/31/2009 <.00110.0023 

MERCURY (total recoverable)4/30/2009 0.00140.0014 

MERCURY (total recoverable)5/31/2009 0.00130.0013 

MERCURY (total recoverable)6/30/2009 0.00100.0010 

MERCURY (total recoverable)7/31/2009 0.00000.0001 

MERCURY (total recoverable)8/31/2009 0.00180.0018 

MERCURY (total recoverable)9/30/2009 0.00130.0014 

MERCURY (total recoverable)10/13/2009 0.00130.0014 

MERCURY (total recoverable)10/31/2009 0.00240.0024 

MERCURY (total recoverable)11/30/2009 0.00110.0011 

MERCURY (total recoverable)12/31/2009 0.00000.0001 

MERCURY (total recoverable)1/31/2010 0.00300.0030 

MERCURY (total recoverable)2/28/2010 0.00160.0016 

MERCURY (total recoverable)3/31/2010 0.00140.0020 

MERCURY (total recoverable)5/31/2010 0.00230.0023 

MERCURY (total recoverable)6/30/2010 0.00000.0000 

MERCURY (total recoverable)7/31/2010 0.00000.0000 

MERCURY (total recoverable)8/31/2010 0.00140.0014 

MERCURY (total recoverable)9/30/2010 0.00170.0017 

MERCURY (total recoverable)10/31/2010 0.00240.0024 

MERCURY (total recoverable)11/30/2010 0.00170.0017 
Permit No.: WA0037168 

City of Puyallup WWTP 102 

MERCURY (total recoverable)12/31/2010 0.00190.0019 

MERCURY (total recoverable)1/31/2011 0.05200.0720 

MERCURY (total recoverable)2/28/2011 0.00130.0013 

MERCURY (total recoverable)3/31/2011 0.00240.0029 

MERCURY (total recoverable)4/30/2011 0.00290.0029 

MERCURY (total recoverable)5/31/2011 0.00300.0030 

MERCURY (total recoverable)6/30/2011 0.00240.0024 

MERCURY (total recoverable)7/31/2011 0.00140.0014 

MERCURY (total recoverable)8/31/2011 0.00150.0015 

MERCURY (total recoverable)9/30/2011 0.00150.0015 

MERCURY (total recoverable)10/31/2011 0.00230.0023 

MERCURY (total recoverable)11/30/2011 0.00170.0017 

MERCURY (total recoverable)12/31/2011 0.00220.0022 

PH 08/31/2003 6.5 7.3 

PH 09/30/2003 6.3 6.6 

PH 10/31/2003 5.9 6.6 

PH 11/30/2003 6.2 6.5 

PH 12/31/2003 6.2 6.3 

PH 01/31/2004 6.1 6.4 

PH 02/29/2004 6.3 6.7 

PH 03/31/2004 6.4 6.7 

PH 04/30/2004 6.4 6.6 

PH 05/31/2004 6.2 6.5 

PH 06/30/2004 6.3 6.5 
Permit No.: WA0037168 

City of Puyallup WWTP 103 

PH 08/31/2004 6.4 6.7 

PH 09/30/2004 6.2 6.8 

PH 10/31/2004 6.3 6.6 

PH 11/30/2004 6.4 6.6 

PH 12/31/2004 6.4 6.8 

PH 01/31/2005 6.1 6.8 

PH 02/28/2005 6.5 6.7 

PH 03/31/2005 6.4 6.9 

PH 04/30/2005 6.7 7.0 

PH 05/31/2005 6.7 7.0 

PH 06/30/2005 6.8 7.1 

PH 07/31/2005 6.8 7.0 

PH 08/31/2005 6.7 7.0 

PH 09/30/2005 6.8 7.0 

PH 10/31/2005 6.9 7.0 

PH 11/30/2005 6.6 6.9 

PH 12/31/2005 6.6 6.8 

PH 01/31/2006 6.5 6.8 

PH 02/28/2006 6.5 6.9 

PH 03/31/2006 6.7 6.9 

PH 04/30/2006 6.6 6.9 

PH 05/31/2006 6.7 7.0 

PH 06/30/2006 6.7 7.2 

PH 07/31/2006 6.5 7.2 
Permit No.: WA0037168 

City of Puyallup WWTP 104 

PH 08/31/2006 6.8 7.4 

PH 09/30/2006 6.6 7.2 

PH 10/31/2006 6.6 7.2 

PH 11/30/2006 6.5 7.1 

PH 12/31/2006 6.3 6.8 

PH 01/31/2007 6.4 6.7 

PH 02/28/2007 6.2 6.7 

PH 03/31/2007 6.2 6.8 

PH 04/30/2007 6.4 7.1 

PH 05/31/2007 6.2 7.4 

PH 06/30/2007 6.9 7.3 

PH 07/31/2007 6.8 7.4 

PH 08/31/2007 6.8 7.3 

PH 09/30/2007 6.7 7.1 

PH 10/31/2007 6.7 7.1 

PH 11/30/2007 6.8 7.1 

PH 12/31/2007 6.5 7.0 

PH 01/31/2008 6.5 7.1 

PH 02/29/2008 6.5 7.1 

PH 03/31/2008 6.5 7.2 

PH 10/31/2008 6.8 7.2 

PH 11/30/2008 6.7 7.1 

PH 12/31/2008 6.6 7.3 

PH 1/31/2009 6.6 7.0 
Permit No.: WA0037168 

City of Puyallup WWTP 105 

PH 3/31/2009 6.7 7.1 

PH 4/30/2009 6.7 7.2 

PH 5/31/2009 6.8 7.2 

PH 6/30/2009 6.8 7.2 

PH 7/31/2009 6.8 7.2 

PH 8/31/2009 6.7 7.1 

PH 9/30/2009 6.6 7.2 

PH 10/13/2009 6.6 7.2 

PH 10/31/2009 6.5 7.1 

PH 11/30/2009 6.5 7.3 

PH 12/31/2009 6.6 7.1 

PH 1/31/2010 6.7 7.0 

PH 2/28/2010 6.7 7.0 

PH 3/31/2010 6.7 7.1 

PH 4/30/2010 6.7 7.2 

PH 5/31/2010 6.7 7.6 

PH 6/30/2010 6.7 7.1 

PH 7/31/2010 6.8 7.2 

PH 8/31/2010 6.9 7.4 

PH 9/30/2010 6.4 7.3 

PH 10/31/2010 6.7 7.4 

PH 11/30/2010 6.7 7.2 

PH 12/31/2010 6.5 7.1 

PH 1/31/2011 6.6 7.2 
Permit No.: WA0037168 

City of Puyallup WWTP 106 

PH 2/28/2011 6.4 7.2 

PH 3/31/2011 6.6 7.0 

PH 4/30/2011 6.5 7.3 

PH 5/31/2011 6.5 7.1 

PH 6/30/2011 6.7 7.4 

PH 7/31/2011 6.7 7.3 

PH 8/31/2011 6.7 7.6 

PH 9/30/2011 6.8 7.6 

PH 10/31/2011 6.6 7.2 

PH 11/30/2011 6.6 7.1 

PH 12/31/2011 6.6 7.2 

TEMPERATURE ( C) 08/31/2003 22.3 23.1 

TEMPERATURE ( C) 09/30/2003 21.5 23.0 

TEMPERATURE ( C) 10/31/2003 19.8 21.3 

TEMPERATURE ( C) 11/30/2003 16.0 17.2 

TEMPERATURE ( C) 12/31/2003 14.5 15.8 

TEMPERATURE ( C) 01/31/2004 13.4 14.4 

TEMPERATURE ( C) 02/29/2004 13.8 14.7 

TEMPERATURE ( C) 03/31/2004 15.0 16.3 

TEMPERATURE ( C) 04/30/2004 16.9 18.0 

TEMPERATURE ( C) 05/31/2004 18.7 19.8 

TEMPERATURE ( C) 06/30/2004 20.2 21.5 

TEMPERATURE ( C) 08/31/2004 22.4 23.6 

TEMPERATURE ( C) 09/30/2004 20.8 22.4 
Permit No.: WA0037168 

City of Puyallup WWTP 107 

TEMPERATURE ( C) 10/31/2004 19.1 20.9 

TEMPERATURE ( C) 11/30/2004 17.1 18.4 

TEMPERATURE ( C) 12/31/2004 15.6 16.5 

TEMPERATURE ( C) 01/31/2005 14.4 15.4 

TEMPERATURE ( C) 02/28/2005 14.5 15.3 

TEMPERATURE ( C) 03/31/2005 15.9 17.1 

TEMPERATURE ( C) 04/30/2005 16.1 17.8 

TEMPERATURE ( C) 05/31/2005 18.4 20.7 

TEMPERATURE ( C) 06/30/2005 20.0 21.3 

TEMPERATURE ( C) 07/31/2005 21.6 23.0 

TEMPERATURE ( C) 08/31/2005 22.4 22.8 

TEMPERATURE ( C) 09/30/2005 21.0 22.7 

TEMPERATURE ( C) 10/31/2005 19.9 20.6 

TEMPERATURE ( C) 11/30/2005 16.7 18.2 

TEMPERATURE ( C) 12/31/2005 14.5 15.4 

TEMPERATURE ( C) 01/31/2006 13.5 14.4 

TEMPERATURE ( C) 02/28/2006 13.4 14.5 

TEMPERATURE ( C) 03/31/2006 14.6 16.0 

TEMPERATURE ( C) 04/30/2006 16.2 18.3 

TEMPERATURE ( C) 05/31/2006 18.2 20.2 

TEMPERATURE ( C) 06/30/2006 21.3 

TEMPERATURE ( C) 07/31/2006 21.5 23.1 

TEMPERATURE ( C) 08/31/2006 21.9 22.8 

TEMPERATURE ( C) 09/30/2006 21.1 22.5 
Permit No.: WA0037168 

City of Puyallup WWTP 108 

TEMPERATURE ( C) 10/31/2006 19.6 21.4 

TEMPERATURE ( C) 11/30/2006 18.2 

TEMPERATURE ( C) 12/31/2006 15.6 

TEMPERATURE ( C) 01/31/2007 14.5 

TEMPERATURE ( C) 02/28/2007 14.6 

TEMPERATURE ( C) 03/31/2007 14.3 15.4 

TEMPERATURE ( C) 04/30/2007 16.9 

TEMPERATURE ( C) 05/31/2007 17.7 19.3 

TEMPERATURE ( C) 06/30/2007 21.3 

TEMPERATURE ( C) 07/31/2007 21.4 22.9 

TEMPERATURE ( C) 08/31/2007 22.1 

TEMPERATURE ( C) 09/30/2007 22.1 

TEMPERATURE ( C) 10/31/2007 19.3 

TEMPERATURE ( C) 11/30/2007 17.8 

TEMPERATURE ( C) 12/31/2007 15.1 

TEMPERATURE ( C) 01/31/2008 14.3 

TEMPERATURE ( C) 02/29/2008 14.8 

TEMPERATURE ( C) 03/31/2008 15.5 

TEMPERATURE ( C) 10/31/2008 20.7 

TEMPERATURE ( C) 11/30/2008 18.4 

TEMPERATURE ( C) 12/31/2008 17.2 

TEMPERATURE ( C) 1/31/2009 14.1 

TEMPERATURE ( C) 3/31/2009 14.8 

TEMPERATURE ( C) 7/31/2009 23.1 
Permit No.: WA0037168 

City of Puyallup WWTP 109 

TEMPERATURE ( C) 1/31/2010 14.3 

TEMPERATURE ( C) 2/28/2010 14.6 

TEMPERATURE ( C) 3/31/2010 16.1 

TEMPERATURE ( C) 4/30/2010 16.8 

TEMPERATURE ( C) 5/31/2010 18.5 

TEMPERATURE ( C) 6/30/2010 19.2 

TEMPERATURE ( C) 7/31/2010 21.1 

TEMPERATURE ( C) 8/31/2010 22.2 

TEMPERATURE ( C) 9/30/2010 21.6 

TEMPERATURE ( C) 10/31/2010 20.7 

TEMPERATURE ( C) 11/30/2010 18.2 

TEMPERATURE ( C) 12/31/2010 15.7 

TEMPERATURE ( C) 1/31/2011 14.4 

TEMPERATURE ( C) 2/28/2011 15.0 

TEMPERATURE ( C) 3/31/2011 14.3 

TEMPERATURE ( C) 4/30/2011 15.6 

TEMPERATURE ( C) 5/31/2011 17.1 

TEMPERATURE ( C) 6/30/2011 19.7 

TEMPERATURE ( C) 7/31/2011 21.4 

TEMPERATURE ( C) 8/31/2011 22.6 

TEMPERATURE ( C) 9/30/2011 22.3 

TEMPERATURE ( C) 10/31/2011 20.5 

TEMPERATURE ( C) 11/30/2011 17.2 

TEMPERATURE ( C) 12/31/2011 15.0 
Permit No.: WA0037168 

City of Puyallup WWTP 110 

TSS 08/31/2003 6.8 9.7 

TSS 09/30/2003 4.9 5.3 

TSS 10/31/2003 7.3 10.8 

TSS 11/30/2003 9.3 10.1 

TSS 12/31/2003 9.9 10.9 

TSS 01/31/2004 10.1 11.7 

TSS 02/29/2004 10.5 12.8 

TSS 03/31/2004 12.4 14.6 

TSS 04/30/2004 8.8 11.4 

TSS 05/31/2004 7.4 16.3 

TSS 06/30/2004 4.9 6.6 

TSS 08/31/2004 8.2 11.8 

TSS 09/30/2004 7.4 9.6 

TSS 10/31/2004 3.9 5.6 

TSS 11/30/2004 3.7 4.5 

TSS 12/31/2004 3.9 4.5 

TSS 01/31/2005 4.2 5.8 

TSS 02/28/2005 4.0 4.2 

TSS 03/31/2005 5.4 6.1 

TSS 04/30/2005 3.7 5.0 

TSS 05/31/2005 3.5 3.8 

TSS 06/30/2005 5.3 9.1 

TSS 07/31/2005 7.2 10.0 

TSS 08/31/2005 3.2 4.8 
Permit No.: WA0037168 

City of Puyallup WWTP 111 

TSS 09/30/2005 4.8 6.2 

TSS 10/31/2005 6.4 7.5 

TSS 11/30/2005 8.4 9.7 

TSS 12/31/2005 4.0 5.7 

TSS 01/31/2006 9.3 14.9 

TSS 02/28/2006 6.3 12.1 

TSS 03/31/2006 4.0 6.5 

TSS 04/30/2006 3.6 4.4 

TSS 05/31/2006 3.0 4.0 

TSS 06/30/2006 5.0 6.0 

TSS 07/31/2006 4.9 7.6 

TSS 08/31/2006 3.2 4.0 

TSS 09/30/2006 3.9 4.4 

TSS 10/31/2006 5.0 6.0 

TSS 11/30/2006 4.8 5.8 

TSS 12/31/2006 6.0 8.5 

TSS 01/31/2007 5.2 9.5 

TSS 02/28/2007 5.8 8.0 

TSS 03/31/2007 7.1 8.9 

TSS 04/30/2007 6.4 7.8 

TSS 05/31/2007 3.8 5.7 

TSS 06/30/2007 4.1 4.6 

TSS 07/31/2007 3.7 4.3 

TSS 08/31/2007 2.9 3.4 
Permit No.: WA0037168 

City of Puyallup WWTP 112 

TSS 09/30/2007 4.6 6.3 

TSS 10/31/2007 6.0 7.3 

TSS 11/30/2007 6.1 6.5 

TSS 12/31/2007 7.1 8.8 

TSS 01/31/2008 7.1 8.5 

TSS 02/29/2008 7.1 10.5 

TSS 03/31/2008 5.0 5.4 

TSS 10/31/2008 2.1 2.6 

TSS 11/30/2008 3.0 3.7 

TSS 12/31/2008 4.4 6.0 

TSS 1/31/2009 4.8 6.3 

TSS 3/31/2009 3.8 5.3 

TSS 4/30/2009 4.6 6.3 

TSS 5/31/2009 2.8 3.9 

TSS 6/30/2009 2.2 2.5 

TSS 7/31/2009 2.6 3.2 

TSS 8/31/2009 3.4 4.0 

TSS 9/30/2009 3.1 4.5 

TSS 10/13/2009 3.1 4.5 

TSS 10/31/2009 4.7 7.2 

TSS 11/30/2009 4.5 5.7 

TSS 12/31/2009 6.1 7.0 

TSS 1/31/2010 6.9 9.5 

TSS 2/28/2010 3.4 3.9 
Permit No.: WA0037168 

City of Puyallup WWTP 113 

TSS 3/31/2010 3.0 4.0 

TSS 4/30/2010 4.5 6.8 

TSS 5/31/2010 4.6 6.6 

TSS 6/30/2010 2.5 3.0 

TSS 7/31/2010 4.3 6.8 

TSS 8/31/2010 3.4 4.6 

TSS 9/30/2010 4.6 5.0 

TSS 10/31/2010 5.7 7.0 

TSS 11/30/2010 5.9 6.3 

TSS 12/31/2010 6.4 7.6 

TSS 1/31/2011 5.5 6.7 

TSS 2/28/2011 4.6 4.9 

TSS 3/31/2011 5.8 7.4 

TSS 4/30/2011 7.5 9.2 

TSS 5/31/2011 6.6 9.4 

TSS 6/30/2011 5.2 7.8 

TSS 7/31/2011 3.8 4.6 

TSS 8/31/2011 3.5 5.2 

TSS 9/30/2011 3.7 4.5 

TSS 10/31/2011 9.7 14.5 

TSS 11/30/2011 7.1 9.1 

TSS 12/31/2011 5.3 6.9 

TSS, % REMOVAL 08/31/200398.0 

TSS, % REMOVAL 09/30/200399.0 
Permit No.: WA0037168 

City of Puyallup WWTP 114 

TSS, % REMOVAL 10/31/200398.0 

TSS, % REMOVAL 11/30/200397.0 

TSS, % REMOVAL 12/31/200396.0 

TSS, % REMOVAL 01/31/200496.0 

TSS, % REMOVAL 02/29/200496.0 

TSS, % REMOVAL 03/31/200496.0 

TSS, % REMOVAL 04/30/200498.0 

TSS, % REMOVAL 05/31/200498.0 

TSS, % REMOVAL 06/30/200499.0 

TSS, % REMOVAL 07/31/200498.0 

TSS, % REMOVAL 08/31/200498.0 

TSS, % REMOVAL 09/30/200498.0 

TSS, % REMOVAL 10/31/200499.0 

TSS, % REMOVAL 11/30/200499.0 

TSS, % REMOVAL 12/31/200499.0 

TSS, % REMOVAL 01/31/200599.0 

TSS, % REMOVAL 02/28/200599.0 

TSS, % REMOVAL 05/31/200599.0 

TSS, % REMOVAL 06/30/200598.0 

TSS, % REMOVAL 07/31/200598.0 

TSS, % REMOVAL 08/31/200599.0 

TSS, % REMOVAL 09/30/200599.0 

TSS, % REMOVAL 10/31/200598.0 

TSS, % REMOVAL 11/30/200597.0 
Permit No.: WA0037168 

City of Puyallup WWTP 115 

TSS, % REMOVAL 12/31/200598.0 

TSS, % REMOVAL 01/31/200694.0 

TSS, % REMOVAL 02/28/200697.0 

TSS, % REMOVAL 03/31/200697.0 

TSS, % REMOVAL 04/30/200699.0 

TSS, % REMOVAL 05/31/200698.0 

TSS, % REMOVAL 06/30/200694.0 

TSS, % REMOVAL 07/31/200698.0 

TSS, % REMOVAL 08/31/200698.8 

TSS, % REMOVAL 09/30/200698.0 

TSS, % REMOVAL 10/31/200698.1 

TSS, % REMOVAL 11/30/200694.6 

TSS, % REMOVAL 12/31/200691.3 

TSS, % REMOVAL 01/31/200797.0 

TSS, % REMOVAL 02/28/200797.4 

TSS, % REMOVAL 03/31/200796.4 

TSS, % REMOVAL 04/30/200797.6 

TSS, % REMOVAL 05/31/200798.6 

TSS, % REMOVAL 06/30/200798.7 

TSS, % REMOVAL 07/31/200798.8 

TSS, % REMOVAL 08/31/200799.2 

TSS, % REMOVAL 09/30/200798.8 

TSS, % REMOVAL 10/31/200797.8 

TSS, % REMOVAL 11/30/200797.1 
Permit No.: WA0037168 

City of Puyallup WWTP 116 

TSS, % REMOVAL 12/31/200793.2 

TSS, % REMOVAL 01/31/200894.5 

TSS, % REMOVAL 02/29/200896.8 

TSS, % REMOVAL 03/31/200897.9 

TSS, % REMOVAL 04/30/200898.6 

TSS, % REMOVAL 05/31/200899.0 

TSS, % REMOVAL 06/30/200899.1 

TSS, % REMOVAL 07/31/200899.0 

TSS, % REMOVAL 08/31/200899.2 

TSS, % REMOVAL 09/30/200899.4 

TSS, % REMOVAL 10/31/200899.2 

TSS, % REMOVAL 11/30/200898.7 

TSS, % REMOVAL 12/31/200898.7 

TSS, % REMOVAL 1/31/2009 98.4 

TSS, % REMOVAL 2/28/2009 98.8 

TSS, % REMOVAL 3/31/2009 98.2 

TSS, % REMOVAL 4/30/2009 97.7 

TSS, % REMOVAL 5/31/2009 98.7 

TSS, % REMOVAL 6/30/2009 99.2 

TSS, % REMOVAL 7/31/2009 99.1 

TSS, % REMOVAL 8/31/2009 98.8 

TSS, % REMOVAL 9/30/2009 98.9 

TSS, % REMOVAL 10/13/200998.9 

TSS, % REMOVAL 10/31/200998.4 
Permit No.: WA0037168 

City of Puyallup WWTP 117 

TSS, % REMOVAL 11/30/200997.7 

TSS, % REMOVAL 12/31/200997.2 

TSS, % REMOVAL 1/31/2010 95.9 

TSS, % REMOVAL 2/28/2010 98.4 

TSS, % REMOVAL 3/31/2010 98.6 

TSS, % REMOVAL 4/30/2010 98.1 

TSS, % REMOVAL 5/31/2010 98.3 

TSS, % REMOVAL 6/30/2010 99.0 

TSS, % REMOVAL 7/31/2010 98.6 

TSS, % REMOVAL 8/31/2010 98.9 

TSS, % REMOVAL 9/30/2010 98.5 

TSS, % REMOVAL 10/31/201098.1 

TSS, % REMOVAL 11/30/201097.5 

TSS, % REMOVAL 12/31/201096.7 

TSS, % REMOVAL 1/31/2011 97.3 

TSS, % REMOVAL 2/28/2011 98.1 

TSS, % REMOVAL 3/31/2011 96.3 

TSS, % REMOVAL 4/30/2011 95.8 

TSS, % REMOVAL 5/31/2011 96.9 

TSS, % REMOVAL 6/30/2011 97.7 

TSS, % REMOVAL 7/31/2011 98.6 

TSS, % REMOVAL 8/31/2011 98.8 

TSS, % REMOVAL 9/30/2011 98.8 

TSS, % REMOVAL 10/31/201196.4 
Permit No.: WA0037168 

City of Puyallup WWTP 118 

TSS, % REMOVAL 11/30/201197.0 

TSS, % REMOVAL 12/31/201197.9 

ZINC (total recoverable) 01/31/2006 23.0 23.0 

ZINC (total recoverable) 02/28/2006 41.0 44.0 

ZINC (total recoverable) 03/31/2006 35.1 38.8 

ZINC (total recoverable) 04/30/2006 42.0 44.3 

ZINC (total recoverable) 05/31/2006 51.0 52.0 

ZINC (total recoverable) 06/30/2006 47.0 47.0 

ZINC (total recoverable) 07/31/2006 64.6 64.6 

ZINC (total recoverable) 08/31/2006 53.9 53.9 

ZINC (total recoverable) 09/30/2006 51.5 51.5 

ZINC (total recoverable) 10/31/2006 55.9 55.9 

ZINC (total recoverable) 11/30/2006 72.4 72.4 

ZINC (total recoverable) 12/31/2006 43.3 43.3 

ZINC (total recoverable) 01/31/2007 38.7 38.7 

ZINC (total recoverable) 02/28/2007 44.3 44.3 

ZINC (total recoverable) 03/31/2007 40.6 45.0 

ZINC (total recoverable) 04/30/2007 34.8 34.8 

ZINC (total recoverable) 05/31/2007 67.2 67.2 

ZINC (total recoverable) 06/30/2007 39.0 39.0 

ZINC (total recoverable) 07/31/2007 57.3 60.7 

ZINC (total recoverable) 08/31/2007 69.8 71.9 

ZINC (total recoverable) 09/30/2007 49.2 49.2 

ZINC (total recoverable) 10/31/2007 54.4 59.4 
Permit No.: WA0037168 

City of Puyallup WWTP 119 

ZINC (total recoverable) 11/30/2007 52.1 52.1 

ZINC (total recoverable) 12/31/2007 23.7 23.7 

ZINC (total recoverable) 01/31/2008 30.5 30.5 

ZINC (total recoverable) 02/29/2008 29.7 29.7 

ZINC (total recoverable) 03/31/2008 39.6 44.8 

ZINC (total recoverable) 04/30/2008 38.4 38.4 

ZINC (total recoverable) 05/31/2008 45.0 45.0 

ZINC (total recoverable) 06/30/2008 30.7 30.7 

ZINC (total recoverable) 07/31/2008 41.6 41.6 

ZINC (total recoverable) 08/31/2008 46.8 46.8 

ZINC (total recoverable) 09/30/2008 46.5 46.5 

ZINC (total recoverable) 10/31/2008 65.0 65.0 

ZINC (total recoverable) 11/30/2008 60.6 60.6 

ZINC (total recoverable) 12/31/2008 53.0 53.0 

ZINC (total recoverable) 1/31/2009 22.8 22.8 

ZINC (total recoverable) 2/28/2009 45.8 45.8 

ZINC (total recoverable) 3/31/2009 49.0 49.5 

ZINC (total recoverable) 4/30/2009 37.1 37.1 

ZINC (total recoverable) 5/31/2009 37.7 37.7 

ZINC (total recoverable) 6/30/2009 44.9 44.9 

ZINC (total recoverable) 7/31/2009 53.6 53.6 

ZINC (total recoverable) 8/31/2009 43.1 43.1 

ZINC (total recoverable) 9/30/2009 43.4 46.5 

ZINC (total recoverable) 10/13/2009 43.4 46.5 
Permit No.: WA0037168 

City of Puyallup WWTP 120 

ZINC (total recoverable) 10/31/2009 55.0 55.0 

ZINC (total recoverable) 11/30/2009 27.5 27.5 

ZINC (total recoverable) 12/31/2009 20.8 20.8 

ZINC (total recoverable) 1/31/2010 19.7 19.7 

ZINC (total recoverable) 2/28/2010 28.8 28.8 

ZINC (total recoverable) 3/31/2010 29.4 30.1 

ZINC (total recoverable) 4/30/2010 24.2 24.2 

ZINC (total recoverable) 5/31/2010 29.0 29.0 

ZINC (total recoverable) 6/30/2010 23.6 23.6 

ZINC (total recoverable) 7/31/2010 35.0 35.0 

ZINC (total recoverable) 8/31/2010 39.5 39.5 

ZINC (total recoverable) 9/30/2010 45.0 45.0 

ZINC (total recoverable) 10/31/2010 39.3 39.3 

ZINC (total recoverable) 11/30/2010 28.9 28.9 

ZINC (total recoverable) 12/31/2010 39.9 39.9 

ZINC (total recoverable) 1/31/2011 35.7 35.7 

ZINC (total recoverable) 2/28/2011 27.4 27.4 

ZINC (total recoverable) 3/31/2011 23.6 24.4 

ZINC (total recoverable) 4/30/2011 22.9 22.9 

ZINC (total recoverable) 5/31/2011 27.9 27.9 

ZINC (total recoverable) 6/30/2011 24.4 24.4 

ZINC (total recoverable) 7/31/2011 25.1 25.1 

ZINC (total recoverable) 8/31/2011 28.7 28.7 

ZINC (total recoverable) 9/30/2011 44.5 44.5 
Permit No.: WA0037168 

City of Puyallup WWTP 121 

ZINC (total recoverable) 10/31/2011 45.9 45.9 

ZINC (total recoverable) 11/30/2011 37.3 37.3 

ZINC (total recoverable) 12/31/2011 24.0 24.0 
Permit No.: WA0037168 

City of Puyallup WWTP 122 

APPENDIX F – PRE-CERTIFICATION OF DRAFT PERMIT 
DRAFT CERTIFICATION UNDER 401 OF THE CLEAN WATER ACT 

FOR PUYALLUP WASTEWATER TREATMENT PLANT 

(PUYALLUP, WASHINGTON) 

As required under section 401 of the Clean Water Act, the Puyallup Tribe of Indians has 

been requested by EPA to certify that the wastewater discharged from the City of 

Puyallup Wastewater Treatment Plant will comply with the Water Quality Standards for 

Surface Waters of the Puyallup Tribe. Region X EPA is proposing to issue a National 

Pollutant Discharge Elimination System permit (WA-003716-8) to the City of Puyallup 

Wastewater Treatment Plant, authorizing the discharge of wastewater from the 

wastewater treatment facility located in the City of Puyallup to the Puyallup River at 

latitude 47o12'26"N, longitude 122o 19' 11" W. 

Upon review of the draft NPDES permit (WA-003716-8), the Puyallup Tribe of Indians 

is granting certification under Section 401 of the Clean Water Act that there is reasonable 

assurance that the proposed activity and resulting discharge is in compliance with 

requirements of the Clean Water Act and Water Quality Standards for Surface Waters of 

the Puyallup Tribe provided that the following conditions are satisfied: 

1.	 A mixing zone pursuant to section 9 of the Tribe’s Water Quality Standards is 

authorized for copper, pH, and ammonia provided that the City of Puyallup 

monitor annually during critical conditions at the edge of the mixing zone. The 

intent of monitoring is to ensure that water quality criteria are met at the edge of 

the mixing zone over the life of the NPDES permit. Samples should be collected 

prior to the annual maintenance of the outfall and diffuser valves so that samples 

are representative of typical conditions. The Tribe will work with the City of 

Puyallup in developing a monitoring program that includes upstream sampling as 

well as sampling within the mixing zone boundary. A Quality Assurance Project 

Plan shall be submitted to the Tribe’s Environmental Protection Department for 

review and approval prior to sampling. See Section I.D. of the draft permit. 

2.	 As required in Section I.D. of the draft permit, the permittee must conduct surface 

water monitoring for total ammonia, temperature, pH, hardness, arsenic (total, 

dissolved, inorganic), copper (dissolved), and mercury (total). The permittee 

must develop a plan or modify the existing plan to incorporate new parameters, 

including continuous temperature monitoring for both effluent temperature 

monitoring and surface water temperature monitoring. Sampling frequencies, 

methods, and method detection limit thresholds for all parameters to be sampled 

are detailed in Table 2 of the draft permit. Continuous temperature monitoring of 

the effluent shall begin within six months of the effective date of the permit. The 

temperature sensor should be set to record at one-hour intervals. The 1-day 

maximum temperature and the 7-day average of the daily maximum temperatures 

(7-DADMax) should be recorded on the DMRs. The electronic data file must be 

submitted to the Puyallup Tribe annually by January 31st for the previous 

monitoring. A placement log that includes the following information relative to 

City of Puyallup NPDES Permit (No. WA-003716-8)- Draft 401 Certification Page 1 
the sensor deployment must be included in the submittal: date, time, temperature 

device manufacturer ID, location, depth, whether it measured air or water 

temperature, and any other details that may explain data anomalies. The Report 

must be submitted to EPA and the Puyallup Tribe with the application for permit 

renewal. See Section I.D (No. 1 through 10) and Table 2, including table notes, of 

the draft permit. 

3.	 As required in Section II.B of the draft permit, the permittee must conduct arsenic 

monitoring for five years to assist in determining if there is reasonable potential 

for inorganic arsenic to exceed human health criteria. The permittee must monitor 

treatment plant influent and effluent quarterly for inorganic arsenic and total 

recoverable arsenic for five years. The permittee must also monitor the upstream 

receiving water for inorganic, dissolved, and total recoverable arsenic. The 

monitoring results must be submitted to EPA and the Tribe with the application for 

permit renewal and reported on the DMRs. See Section I.D. and II.B. 

4.	 The permittee shall conduct an annual outfall inspection and repair any and all tideflex valves damaged by the river bed load during low flow conditions. This annual 

inspection and maintenance program is intended to optimize mixing and dilution. 

5.	 Monitoring data must be submitted electronically to EPA and the Tribe no later than 

the 15th of the month following the completed reporting period. Electronic submittals 

can be e-mailed directly to Char Naylor at char.naylor@puyalluptribe.com. 

6.	 The permittee shall provide an annual report to the USFWS, NMFS and the Puyallup 

Tribe by February 15 each year of the permit term. The annual report shall compile 

and summarize data and information from Discharge Monitoring Reports submitted 

by the City of Puyallup, and shall include the following: 

a.	 A summary of maximum reported effluent discharge concentration 

b.	 A summary of any reported effluent limit violations. 

c.	 A summary of any reported emergency and/or non-compliance events, 

including any instances when the WWTP discharged under bypass or upset 

conditions. 

d.	 A summary of surface/receiving water monitoring data. 

e.	 Results of annual Whole Effluent Toxicity testing. 

f.	 A summary if there have been any significant revisions to the facility 

operation and maintenance (O&M) plan. 

See Section III.B.3 in the draft permit.
 

City of Puyallup NPDES Permit (No. WA-003716-8)- Draft 401 Certification Page 2