Page 1 of 55

Permit No. WA0029181

Issuance Date: December 19, 2014

Effective Date: February 1, 2015

Expiration Date: January 31, 2020

National Pollutant Discharge Elimination System

Waste Discharge Permit No. WA0029181

State of Washington

DEPARTMENT OF ECOLOGY

Northwest Regional Office

3190 160th Avenue SE

Bellevue, WA 98008-5452

In compliance with the provisions of

The State of Washington Water Pollution Control Law

Chapter 90.48 Revised Code of Washington

and

The Federal Water Pollution Control Act

(The Clean Water Act)

Title 33 United States Code, Section 1342 et seq.

KING COUNTY WASTEWATER TREATMENT DIVISION – WEST POINT WASTEWATER 

TREATMENT PLANT & COMBINED SEWER OVERFLOW SYSTEM

King Street Center, KSC-NR-0512

201 South Jackson Street

Seattle, WA 98104-3855

is authorized to discharge in accordance with the Special and General Conditions that follow.

Facility 

Name

West Point 

Wastewater 

Treatment Plant

(serves combined 

sewer area)

Alki Storage 

and CSO 

Treatment Plant

Carkeek Storage

and CSO 

Treatment Plant

Denny/Elliott West 

Storage and CSO 

Treatment Plant

Henderson/MLK 

Storage and CSO 

Treatment Plant

Plant 

Address

1400 Discovery Park 

Blvd

Seattle, WA 98199

3380 Beach Drive SW

Seattle, WA 98116-2616

1201 NW Carkeek Park 

Rd, 

Seattle, WA 98177-4640

545 Elliott Ave W

Seattle, WA 98119

Outlet Regulator

9829 42nd Ave S

Seattle, WA 98118

Receiving 

Water

Puget Sound Puget Sound Puget Sound Elliott Bay Duwamish 

Waterway

Plant 

Type

Secondary, 

Activated Sludge, 

Chlorine Disinfection

Satellite CSO Storage 

and Treatment Plant

Satellite CSO Storage 

and Treatment Plant

Satellite CSO 

Storage and 

Treatment Plant

Satellite CSO 

Storage and 

Treatment Plant

Discharge 

Location:

Lat: 47.661111 ̊

Long: -122.446389 ̊

Lat: 47.57025 ̊

Long: -122.4225 ̊

Lat: 47.71264 ̊

Long: -122.38789 ̊

Lat: 47.61755 ̊

Long: -122.36186 ̊

Lat: 47.51194 ̊

Long: -122.29736 ̊

Kevin C. Fitzpatrick

Water Quality Section Manager

Northwest Regional Office

Washington State Department of Ecology
Page 2 of 55

Permit No. WA0029181

Table of Contents

Summary of Permit Report Submittals ......................................................................................... 4

Special Conditions.......................................................................................................................... 5

S1. Discharge limits....................................................................................................................5

S1.A. Effluent limits for Outfall 001 - West Point wastewater treatment plant ...........................5

S1.B. Effluent limits for the CSO treatment plants ......................................................................6

S1.C. Mixing zone authorizations.................................................................................................9

S2. Monitoring requirements ..................................................................................................10

S2.A. Monitoring schedules........................................................................................................10

S2.B. Sampling and analytical procedures .................................................................................14

S2.C. Flow measurement, field measurement, and continuous monitoring devices ..................14

S2.D. Laboratory accreditation ...................................................................................................15

S3. Reporting and recording requirements............................................................................15

S3.A. Reporting ..........................................................................................................................15

S3.B. Permit submittals and schedules.......................................................................................16

S3.C. Records retention ..............................................................................................................17

S3.D. Recording of results..........................................................................................................17

S3.E. Additional monitoring by the Permittee ...........................................................................17

S3.F. Reporting permit violations ..............................................................................................17

S3.G. Other reporting..................................................................................................................19

S3.H. Maintaining a copy of this permit.....................................................................................19

S4. Facility loading (West Point WWTP)...............................................................................19

S4.A. Design criteria...................................................................................................................19

S4.B. Plans for maintaining adequate capacity...........................................................................20

S4.C. Duty to mitigate ................................................................................................................20

S4.D. Notification of new or altered sources..............................................................................20

S4.E. Wasteload assessment.......................................................................................................21

S5. Operation and maintenance ..............................................................................................21

S5.A. Certified operator..............................................................................................................21

S5.B. Operation and maintenance program................................................................................22

S5.C. Short-term reduction .........................................................................................................22

S5.D. Electrical power failure.....................................................................................................22

S5.E. Prevent connection of inflow............................................................................................22

S5.F. Bypass procedures ............................................................................................................23

S5.G. Operations and maintenance (O&M) manual ...................................................................24

S6. Pretreatment.......................................................................................................................25

S6.A. General requirements........................................................................................................25

S6.B. Monitoring requirements ..................................................................................................29

S6.C. Reporting of monitoring results........................................................................................30

S6.D. Local limit development ...................................................................................................30

S7. Solid wastes.........................................................................................................................30

S7.A. Solid waste handling.........................................................................................................30

S7.B. Leachate............................................................................................................................30

S8. Acute toxicity ......................................................................................................................31

S8.A. Acute testing .....................................................................................................................31

S8.B. Sampling and reporting requirements...............................................................................31

S9. Chronic toxicity ..................................................................................................................32

S9.A. Chronic testing..................................................................................................................32

S9.B. Sampling and reporting requirements...............................................................................32
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Permit No. WA0029181

S10. Wet weather operation.......................................................................................................33

S11. Combined sewer overflows................................................................................................34

S11.A. Authorized CSO discharge locations................................................................................34

S11.B. Nine minimum controls....................................................................................................35

S11.C. Combined sewer overflow reporting ................................................................................37

S11.D. Combined sewer overflow reduction plan amendment.....................................................38

S11.E. Engineering reports and plans and specifications for CSO reduction projects.................38

S11.F. Requirements for controlled combined sewer overflows .................................................38

S12. Spill control plan..................................................................................................................40

S13. Sediment monitoring ...........................................................................................................40

S13.A. Sediment sampling – West Point WWTP.........................................................................40

S13.B. Sediment sampling – CSO outfalls...................................................................................41

S13.C. Sediment quality summary at CSO outfalls......................................................................42

S14. Outfall evaluation...............................................................................................................43

S15. Elliott West CSO treatment plant – copper reduction assessment................................43

S16. Elliott West CSO treatment plant – settleable solids removal assessment ...................43

S17. Application for permit renewal or facility modifications...............................................44

General Conditions...................................................................................................................... 45

G1. Signatory requirements .....................................................................................................45

G2. Right of inspection and entry ............................................................................................46

G3. Permit actions.....................................................................................................................46

G4. Reporting planned changes...............................................................................................47

G5. Plan review required..........................................................................................................48

G6. Compliance with other laws and statutes.........................................................................48

G7. Transfer of this permit.......................................................................................................48

G8. Reduced production for compliance.................................................................................49

G9. Removed substances...........................................................................................................49

G10. Duty to provide information..............................................................................................49

G11. Other requirements of 40 CFR .........................................................................................49

G12. Additional monitoring........................................................................................................49

G13. Payment of fees...................................................................................................................49

G14. Penalties for violating permit conditions .........................................................................49

G15. Upset....................................................................................................................................50

G16. Property rights....................................................................................................................50

G17. Duty to comply....................................................................................................................50

G18. Toxic pollutants..................................................................................................................50

G19. Penalties for tampering......................................................................................................50

G20. Compliance schedules........................................................................................................51

G21. Service agreement review ..................................................................................................51

Appendix A................................................................................................................................... 52

Table 1. Dilution zone sizes and dilution factors for permitted outfalls...................................................... 9

Table 2. Monitoring Schedule – West Point WWTP (001).................................................................... 10

Table 3. Monitoring Schedule for all CSO TPs: Alki-051, Carkeek-046, Elliott West-027, Henderson/MLK-044...12

Table 4. Monitoring Schedule – Untreated CSO Outfalls..................................................................... 14

Table 5. Permitted CSO outfalls (38)............................................................................................ 34

Table 6. Controlled CSO outfalls (16)........................................................................................... 39
Page 4 of 55

Permit No. WA0029181

Summary of Permit Report Submittals

Section Submittal Frequency First Submittal Date

S3.A Discharge Monitoring Report Monthly

Annually

March 15, 2015

July 31, 2015

S3.F Reporting Permit Violations As necessary

S4.B Plans for Maintaining Adequate Capacity As necessary

S4.D Notification of New or Altered Sources As necessary

S4.E Wasteload Assessment 1/permit cycle With permit application

S5.F Bypass Notification As necessary

S5.G Operations and Maintenance Update As necessary

S6.A Pretreatment Report 1/year March 31, 2015

S8 Acute Toxicity Effluent Tests

(testing in 1

st and 3rd quarters of 2017)

2 tests/permit cycle, 

1 submittal/permit 

cycle

With permit application

S9 Chronic Toxicity Effluent Tests

(testing in 2

nd and 4th quarters of 2017)

2 tests/permit cycle, 

1 submittal/permit 

cycle

With permit application

S10 Wet Weather Operation Reports As necessary with 

monthly DMR 

submittal

S11.C CSO Monthly Report Monthly with 

monthly DMR 

submittal

S11.C CSO Annual Report Annually July 31, 2015

S11.D CSO Reduction Plan Amendment 1/permit cycle With permit application

S11.F.d CSO Post Construction Monitoring Data Report 1/permit cycle December 1, 2019

S12 Spill Control Plan Update As necessary

S13.A Sediment Sampling & Analysis Plan- West Pt

Sediment Data Report - West Pt

1/permit cycle December 1, 2016

December 1, 2018

S13.B Sediment Sampling & Analysis Plan- CSO Outfalls

Sediment Data Report - CSO Outfalls 

1/permit cycle December 1, 2016

December 1, 2018

S13.C Sediment Quality at CSO Outfalls Summary Report 1/permit cycle December 1, 2018

S14 Outfall Evaluation Reports – West Point and CSO TPs 1/permit cycle With permit application

S15 Elliott West Copper Reduction Assessment 1/permit cycle November 1, 2018

S16 Elliott West Settleable Solids Removal Assessment 1/permit cycle November 1, 2018

S17 Application for Permit Renewal 1/permit cycle January 31, 2019

G1 Notice of Change in Authorization As necessary

G4 Reporting Planned Changes As necessary

G5 Engineering Report for Construction or Modification 

Activities

As necessary

G13 Payment of Fees As assessed
Page 5 of 55

Permit No. WA0029181

Special Conditions

S1. Discharge limits 

All discharges and activities authorized by this permit must comply with the terms and 

conditions of this permit. The discharge of any of the following pollutants more 

frequently than, or at a level in excess of, that identified and authorized by this permit 

violates the terms and conditions of this permit.

S1.A. Effluent limits for Outfall 001 - West Point wastewater treatment plant

Beginning on the effective date of this permit and lasting through the expiration 

date, the Permittee may discharge treated municipal wastewater at the permitted 

locations subject to compliance with the following limits:

Effluent Limits: Outfall #001 - West Point WWTP

Latitude: 47.661111 ̊ Longitude: -122.446389 ̊

Parameter Average Monthly a Average Weekly b

Carbonaceous Biochemical 

Oxygen Demand (5-day)

25 milligrams/liter (mg/L)

44,800 pounds/day (lbs/day)

May–Oct: 85% removal of influent CBOD5

Nov–April: 80% removal of influent CBOD5

40 mg/L 

71,700 lbs/day

Total Suspended Solids 30 mg/L, 53,800 lbs/day

May–Oct: 85% removal of influent TSS

Nov–April: 80% removal of influent TSS

45 mg/L

80,700 lbs/day

Monthly Geometric Mean Weekly Geometric Mean

Fecal Coliform Bacteria c200/100 mL 400/100 mL

Instantaneous Minimum Instantaneous Maximum

pH d6.0 9.0

Average Monthly a Maximum Daily e

Total Residual Chlorine 139 μg/L 364 μg/L

a

Average monthly effluent limit means the highest allowable average of daily discharges over a calendar month, 

calculated as the sum of all daily discharges measured during a calendar month divided by the number of daily 

discharges measured during that month.

b

Average weekly discharge limit means the highest allowable average of daily discharges over a calendar week, 

calculated as the sum of all daily discharges measured during a calendar week divided by the number of daily 

discharges measured during that week.

c

Ecology provides directions to calculate this value in publication No. 04-10-020, Information Manual for Treatment 

Plant Operators, available at: http://www.ecy.wa.gov/pubs/0410020.pdf.

d Report the instantaneous maximum and minimum pH monthly. Do not average pH values.

e Maximum daily effluent limit means the highest allowable daily discharge. The daily discharge is the average 

measurement of the pollutant over the day.
Page 6 of 55

Permit No. WA0029181

S1.B. Effluent limits for the CSO treatment plants

Beginning on the effective date of this permit and lasting through the expiration 

date, the Permittee may discharge treated combined sewer overflows at the 

following permitted locations subject to compliance with the following limits. 

Discharges from these outfalls are prohibited except as a result of precipitation 

events.

Effluent Limits: Outfall #051 - Alki CSO TP

Latitude: 47.57025 ̊ Longitude: -122.4225 ̊

Parameter Average Monthly Annual Average a

Total Suspended Solids Removal 

Efficiency b

Report Equal to or greater than 50% 

removal of influent TSS

Monthly Geometric Mean

Fecal Coliform Bacteria 400/100 mL c

Annual Average a

Settleable Solids 0.3 mL/L/hr

Instantaneous Minimum Instantaneous Maximum

pH d6.0 9.0

Maximum Daily e

Total Residual Chlorine 234 μg/L

Long-Term Average f

Number of Discharge Events 29 events/year

Discharge Volume 108 million gallons/year

a Calculate annual averages as the average of all ‘event’ averages. Do not omit one event per year from calculation.

Data must be collected and reported on a calendar year basis via WQWebDMR and in the Annual CSO Report.

b Calculate the TSS total removal efficiency on a mass balance basis as the percent of solids captured at the CSO 

treatment facility and then permanently removed at the West Point WWTP. The reported daily average TSS % 

removal efficiency at the West Point WWTP, corresponding to the event, must be used for calculating the total 

removal efficiency for the CSO facility. Note: While % TSS removal is reported on a monthly basis, compliance is 

based on the annual average as reported via WQWebDMR and in the annual CSO report as required in S11.

c

For the monthly geometric mean, calculate the geometric mean of all samples collected during the month; use a 

value of 1 for the geomean calc when fecal coliform results are 0. Do not include non-discharge days in the 

calculation. Ecology provides directions to calculate this value in publication No. 04-10-020, Information Manual for 

Treatment Plant Operators, available at: http://www.ecy.wa.gov/pubs/0410020.pdf.

d Report the instantaneous maximum and minimum pH monthly. Do not average pH values.

e Maximum daily effluent limit means the highest allowable daily discharge. The daily discharge is the average 

measurement of the pollutant measured over a calendar day while discharging.

f

Long-term average will be assessed using data collected over the full permit cycle. Data must be collected and 

reported for the period of the permit cycle prior to permit renewal, as required in S4.E.
Page 7 of 55

Permit No. WA0029181

Effluent Limits: Outfall #046 - Carkeek CSO TP

Latitude: 47.71264 ̊ Longitude: -122.38789 ̊

Parameter Average Monthly Annual Average a

Total Suspended Solids Removal 

Efficiency b

Report Equal to or greater than 50% 

removal of influent TSS

Monthly Geometric Mean

Fecal Coliform Bacteria c400/100 mL

Annual Average a

Settleable Solids 0.3 mL/L/hr

Instantaneous Minimum Instantaneous Maximum

pH d6.0 9.0

Maximum Daily e

Total Residual Chlorine 490 μg/L

Long-Term Average f

Number of Discharge Events 10 events/year

Discharge Volume 46 million gallons/year

a Calculate annual averages as the average of all ‘event’ averages. Do not omit one event per year from calculation. 

Data must be collected and reported on a calendar year basis via WQWebDMR and in the Annual CSO Report.

b Calculate the TSS total removal efficiency on a mass balance basis as the percent of solids captured at the CSO 

treatment facility and then permanently removed at the West Point WWTP. The reported daily average TSS % 

removal efficiency at the West Point WWTP, corresponding to the event, must be used for calculating the total 

removal efficiency for the CSO facility. Note: While % TSS removal is reported on a monthly basis, compliance is 

based on the annual average as reported via WQWebDMR and in the annual CSO report as required in S11.

c

For the monthly geometric mean, calculate the geometric mean of all samples collected during the month; use a 

value of 1 for the geomean calc when fecal coliform results are 0. Do not include non-discharge days in the 

calculation. Ecology provides directions to calculate this value in publication No. 04-10-020, Information Manual for 

Treatment Plant Operators, available at: http://www.ecy.wa.gov/pubs/0410020.pdf.

d Report the instantaneous maximum and minimum pH monthly. Do not average pH values.

e Maximum daily effluent limit means the highest allowable daily discharge. The daily discharge is the average 

measurement of the pollutant measured over a calendar day while discharging.

f

Long-term average will be assessed using data collected over the full permit cycle. Data must be collected and 

reported for the period of the permit cycle prior to permit renewal, as required in S4.E.
Page 8 of 55

Permit No. WA0029181

Effluent Limits: Outfall #027B - Elliott West CSO TP

Latitude: 47.61755 ̊ Longitude: -122.361856 ̊

Parameter Average Monthly Annual Average a

Total Suspended Solids Removal 

Efficiency b

Report Equal to or greater than 50% 

removal of influent TSS

Monthly Geometric Mean

Fecal Coliform Bacteria c400/100 mL

Annual Average a

Settleable Solids 0.3 mL/L/hr

Instantaneous Minimum Instantaneous Maximum

pH d6.0 9.0

Maximum Daily e

Total Residual Chlorine 109 μg/L

a Calculate annual averages as the average of all ‘event’ averages. Do not omit one event per year from calculation. 

Data must be collected and reported on a calendar year basis via WQWebDMR and in the Annual CSO Report.

b Calculate the TSS total removal efficiency on a mass balance basis as the percent of solids captured at the CSO 

treatment facility and then permanently removed at the West Point WWTP. The reported daily average TSS % 

removal efficiency at the West Point WWTP, corresponding to the event, must be used for calculating the total 

removal efficiency for the CSO facility. Note: While % TSS removal is reported on a monthly basis, compliance is 

based on the annual average as reported via WQWebDMR and in the annual CSO report as required in S11.

c

For the monthly geometric mean, calculate the geometric mean of all samples collected during the month; use a 

value of 1 for the geomean calc when fecal coliform results are 0. Do not include non-discharge days in the 

calculation. Ecology provides directions to calculate this value in publication No. 04-10-020, Information Manual for 

Treatment Plant Operators, available at: http://www.ecy.wa.gov/pubs/0410020.pdf.

d Report the instantaneous maximum and minimum pH monthly. Do not average pH values.

e Maximum daily effluent limit means the highest allowable daily discharge. The daily discharge is the average 

measurement of the pollutant measured over a calendar day while discharging.
Page 9 of 55

Permit No. WA0029181

Effluent Limits: Outfall #044 - Henderson/MLK CSO TP

Latitude: 47.51194 ̊ Longitude: -122.29736 ̊

Parameter Average Monthly Annual Average a

Total Suspended Solids Removal 

Efficiency b

Report Equal to or greater than 50% 

removal of influent TSS

Monthly Geometric Mean

Fecal Coliform Bacteria c400/100 mL

Annual Average a

Settleable Solids 0.3 mL/L/hr

Instantaneous Minimum Instantaneous Maximum

pH d6.0 9.0

Maximum Daily e

Total Residual Chlorine 39 μg/L

a Calculate annual averages as the average of all ‘event’ averages. Do not omit one event per year from calculation. 

Data must be collected and reported on a calendar year basis via WQWebDMR and in the Annual CSO Report.

b Calculate the TSS total removal efficiency on a mass balance basis as the percent of solids captured at the CSO 

treatment facility and then permanently removed at the West Point WWTP. The reported daily average TSS % 

removal efficiency at the West Point WWTP, corresponding to the event, must be used for calculating the total 

removal efficiency for the CSO facility. Note: While % TSS removal is reported on a monthly basis, compliance is 

based on the annual average as reported via WQWebDMR and in the annual CSO report as required in S11.

c

For the monthly geometric mean, calculate the geometric mean of all samples collected during the month; use a 

value of 1 for the geomean calc when fecal coliform results are 0. Do not include non-discharge days in the 

calculation. Ecology provides directions to calculate this value in publication No. 04-10-020, Information Manual for 

Treatment Plant Operators, available at: http://www.ecy.wa.gov/pubs/0410020.pdf.

d Report the instantaneous maximum and minimum pH monthly. Do not average pH values.

e Maximum daily effluent limit means the highest allowable daily discharge. The daily discharge is the average 

measurement of the pollutant measured over a calendar day while discharging.

S1.C. Mixing zone authorizations

Table 1 summarizes the mixing boundaries and dilution factors for the West Point 

WWTP and CSO treatment plant outfalls.

Table 1. Dilution zone sizes and dilution factors for permitted outfalls

Outfall

Mixing Zone Radius

(feet) a Dilution Factors

Chronic Acute

Aquatic 

Life 

Chronic

Aquatic 

Life 

Acute

Human Health: 

Carcinogen

Human Health: 

Non-Carcinogen

West Point WWTP 430 43 188 28 324 324

Alki CSO b343 34 99 20

Carkeek CSO b395 39.5 104 75

Elliott West CSO b260 26 9.7 8.4

Henderson/MLK CSO b312 c31.2 c10.3 1.9

a As measured from each port.

b Mixing zone dilution modeling is more accurate for continuous discharges. The resultant dilution factor that is 

achieved in the mixing zone of an intermittent discharge such as this is an approximation that is based on reasonable 

assumptions about the flow characteristics of the discharge and conditions of the receiving water.

c

Since this is a river discharge, these dimensions represent distance downstream of outfall instead of radius.
Page 10 of 55

Permit No. WA0029181

S2. Monitoring requirements

S2.A. Monitoring schedules

The Permittee must monitor in accordance with the schedules in the following 

tables and the requirements specified in Appendix A or any corresponding

Sampling Analysis Plan/Quality Assurance Project Plan (SAP/QAPP) documents. 

Alternative methods from 40 CFR Part 136 are acceptable only for those 

parameters without limits and if the DL and QL are equivalent to those specified 

in Appendix A, any corresponding SAP/QAPP documents, or sufficient to 

produce a measurable quantity.

Table 2. Monitoring Schedule – West Point WWTP (001)

Parameter Units Minimum Frequency Sample Type

(1) Wastewater Influent a

BOD5 mg/L 1/week 24-hr Composite b

lbs/day c1/week Calculation

CBOD5 mg/L 1/day 24-hr Composite

lbs/day c1/day Calculation 

TSS mg/L 1/day 24-hr Composite

lbs/day 1/day Calculation

(2) Final Wastewater Effluent d

Flow MGD Continuous e Meter

CBOD5 

f mg/L 1/day 24-hr Composite

lbs/day c1/day Calculation

% removal g1/month Calculation

TSS mg/L 1/day 24-hr Composite

lbs/day c1/day Calculation

% removal g1/month Calculation

Chlorine (after dechlorination) μg/L Continuous e Meter

Fecal Coliform # /100 ml 1/day Grab h

pH Standard Units Continuous e Meter

(3) Effluent Characterization – Final Wastewater Effluent

Total Ammonia mg/L N 1/month 24-hr Composite

lbs/day 1/month Calculation

Nitrate + Nitrite Nitrogen mg/L N 1/month 24-hr Composite

Total Kjeldahl Nitrogen mg/L N 1/month 24-hr Composite

Total Phosphorus mg/L P 1/month 24-hr Composite

Soluble Reactive Phosphorus mg/L P 1/month 24-hr Composite

(4) Whole Effluent Toxicity Testing – Final Wastewater Effluent - As specified in Permit Conditions S8 & S9.

Acute Toxicity Testing 2/permit cycle 24-hr Composite

Chronic Toxicity Testing 2/permit cycle 24-hr Composite

(5) Pretreatment - As specified in Permit Condition S6.

(6) CSO Monitoring - As specified in Permit Condition S11.

(7) Permit Application Requirements – Final Wastewater Effluent j

Dissolved Oxygen mg/L 1/year in Aug Grab

Oil and Grease (HEM) mg/L 1/year in Aug Grab

Total Dissolved Solids mg/L 1/year in Aug 24-hr Composite

Total Hardness mg/L 1/year in Aug 24-hr Composite

Alkalinity mg/L as CaCO3 1/year in Aug Grab
Page 11 of 55

Permit No. WA0029181

Table 2. Monitoring Schedule – West Point WWTP (001)

Parameter Units Minimum Frequency Sample Type

Temperature  ̊C 1/year in Aug Grab

Cyanide μg/L 2/year i, j Grab

Total Phenolic Compounds μg/L 2/year i, j Grab

Priority Pollutants (PP) – Total Metals μg/L (ng for 

mercury)

2/year i, j 24-hr Composite; Grab for 

mercury

PP – Volatile Organic Compounds μg/L 2/year i, j Grab

PP – Acid-extractable Compounds μg/L 2/year i, j 24-hr Composite

PP – Base-neutral Compounds μg/L 2/year i, j 24-hr Composite

(8) Sediment Study - As specified in Permit Condition S13.A.

a Wastewater Influent means the raw sewage flow from the collection system into the treatment facility. Sample the 

wastewater entering the headworks of the plant excluding any side-stream returns from inside the plant.

b 24-hour composite means a series of individual samples collected over a 24-hour period in a single container and 

analyzed as one sample.

c lbs/day = Concentration (in mg/L) x Flow (in MGD) x Conversion Factor (8.34) = lbs/day. Calculate using the average 

flow measured during the sample collection period.

d

Final Wastewater Effluent means wastewater which is exiting, or has exited, the last treatment process or operation. 

e “Continuous” means uninterrupted except for brief lengths of time for calibration, power failure, or unanticipated 

equipment repair or maintenance. The Permittee must sample every six hours when continuous monitoring is not 

possible.

f

 Effluent samples for CBOD5 analysis may be taken before or after the disinfection process. If taken after, dechlorinate 

and reseed the sample.

g % removal = Influent monthly average concentration (mg/L) – Effluent monthly average concentration (mg/L) x 100

Influent monthly average concentration (mg/L)

h

“Grab” means an individual sample collected over a 15-minute, or less, period.

i One of the two annual sampling events must occur when flows are being diverted around the secondary process (i.e. 

instantaneous effluent flow rate is greater than 300 MGD) or when the average daily precipitation is equal to or greater

than 0.25 inches. 

j

The Permittee must record and report the wastewater treatment plant flow discharged on the day it collects the sample 

for Appendix A pollutant testing with the discharge monitoring report.

See Appendix A or corresponding SAP/QAPP for the required detection (DL) or quantitation (QL) levels.

Report single analytical values below detection as “less than (detection level)” where (detection level) is the numeric 

value specified in Appendix A.

Report single analytical values between the detection and quantitation levels with qualifier code of ‘j’ following the 

value. If unable to obtain the required DL and QL due to matrix effects, the Permittee must submit a matrix specific 

MDL and a QL with appropriate laboratory documentation.
Page 12 of 55

Permit No. WA0029181

Table 3. Monitoring Schedule for all CSO TPs: Alki-051, Carkeek-046, Elliott West-027, Henderson/MLK-044

Parameter Units Minimum 

Frequency

Sample 

Type

(1) Influent a

Volume MG Per Event b Meter/Calculation c

BOD5 mg/L Per Event Flow Proportional Composite d

TSS mg/L Per Event Flow Proportional Composite

(2) Final Effluent e

Volume MG Per Event Meter/Calculation

BOD5 mg/L Per Event Flow Proportional Composite

TSS mg/L Per Event Flow Proportional Composite

% removal f1/month Calculation

Settleable Solids mL/L/hr Per Event Flow Proportional Composite

Total Residual Chlorine ug/L Continuous during 

events g

Meter

Fecal Coliform # /100 ml Per Event Grab h, i

pH Std Units Continuous during 

events

Meter

Copper, total recoverable jμg/L Elliott West and 

Henderson/MLK: 

Per Event

All others: 1/year

Flow Proportional Composite

Cyanide μg/L Elliott West: 4/yr Grab

Dissolved Oxygen mg/L Elliott West:

Per Event starting in 

Nov 2016

All others: 1/year

Meter or Grab

Discharge Duration Hours Per Event Meter/Calculation

Storm Duration k Hours Per Event Meter/Calculation

Precipitation Inches Per Event Meter/Calculation

(3) Effluent Characterization – Final Effluent 

Total Ammonia mg/L N Henderson/MLK: 

1

st 4 discharge 

events, then 1/year

All others: 1/year

Flow Proportional Composite

Nitrate-Nitrite Nitrogen mg/L N Flow Proportional Composite

Total Kjeldahl Nitrogen mg/L N Flow Proportional Composite

Total Phosphorus mg/L P Flow Proportional Composite

Soluble Reactive Phosphorus mg/L P Flow Proportional Composite

Total Alkalinity mg CaCO3/L Flow Proportional Composite or Grab

Temperature C Grab

Priority Pollutants (PP)–Total Metals μg/L Flow Proportional Composite; Grab for 

mercury

PP – Volatile Organic Compounds μg/L Grab

PP – Acid-extractable Compounds μg/L Flow Proportional Composite

PP – Base-neutral Compounds μg/L Flow Proportional Composite

Cyanide μg/L Grab

Total Phenols μg/L Grab

PP – Total PCBs l

μg/L Henderson/MLK 

only: 1/year

Flow Proportional Composite

(4) Permit Application Requirements – Final Effluent m

Oil and Grease mg/L 1/year Grab

Total Dissolved Solids mg/L 1/year Flow Proportional Composite
Page 13 of 55

Permit No. WA0029181

Table 3. Monitoring Schedule for all CSO TPs: Alki-051, Carkeek-046, Elliott West-027, Henderson/MLK-044

Parameter Units Minimum 

Frequency

Sample 

Type

Total Hardness mg/L 1/year Flow Proportional Composite

a

Influent means the combined raw sewage and stormwater flows from the collection system into the treatment facility. 

Sample the wastewater entering the treatment plant.

b

“Per Event” means a unique flow event as defined in the Permit Writer’s Manual, p. V-30. Ecology defines the 

minimum inter-event period as 24 hours. A CSO event is considered to have ended only after at least 24 hours has 

elapsed since the last measured occurrence of an overflow.

c

“Meter/Calculation” means the total volume of the discharge or amount of precipitation event as estimated by direct 

measurement or indirectly by calculation (i.e. flow weirs, pressure transducers, tipping bucket). Precipitation must be 

measured by the nearest precipitation-measuring device as owned and operated by King County and actively 

monitored during the period of interest.

d

“Flow proportional composite” means a series of individual samples collected over a flow period in a single container, 

and analyzed as one sample. The composite sample should represent the entire discharge event.

e

“Final Effluent” means treated CSO effluent which is discharged to the receiving water, sampled after the 

dechlorination process. The Permittee may take effluent samples for the BOD5 analysis before or after the 

disinfection process. If taken after, dechlorinate and reseed the sample.

f

The total removal efficiency for TSS is to be calculated on a mass balance basis as the percent of solids captured at 

the CSO Treatment Plant and then permanently removed at the West Point Treatment Plant based on the estimated 

removal efficiency at West Point.

g

“Continuous” means uninterrupted except for brief lengths of time for calibration, power failure, or unanticipated 

equipment repair or maintenance. The Permittee must sample every hour when continuous monitoring is not 

possible.

h

“Grab” means an individual sample collected over a 15-minute, or less, period.

i

Fecal grab samples must be taken at specific time intervals after the discharge begins to the receiving water as 

follows:

1. 1 sample within first 3 hours.

2. 1 sample between 3-8 hours.

3. 1 sample between 20-24 hours.

4. If discharge extends beyond 24 hours, at a minimum take 1 sample each day until the discharge ends.

If more than 1 sample is collected within the time intervals listed above, report the average of the fecal values for that 

time interval. Report one fecal value for each interval (as appropriate for the discharge duration) and calculate the 

monthly geomean using all of the reported fecal values for the month.

Chlorine and pH analyzer readings must be logged when fecal coliform samples are taken. Each individual fecal 

coliform sample should be dechlorinated.

j Copper sampling must be performed with laboratory-verified sampling procedures.

k

Storm duration is the total amount of time precipitation occurred that contributed to a discharge event; it is determined 

on a case-by-case basis.

l

PCB monitoring only required for the Henderson/MLK CSO treatment plant. Total PCBs must be analyzed using 

method 1668 with a detection limit of 0.0001 μg/L or lower.

m

The Permittee must record and report the wastewater treatment plant flow discharged on the day it collects the 

sample for Appendix A pollutant testing with the discharge monitoring report.

See Appendix A or corresponding SAP/QAPP for the required detection (DL) or quantitation (QL) levels.

Report single analytical values below detection as “less than [detection level]” where [detection level] is the numeric 

value specified in Appendix A.

Report single analytical values between the detection and quantitation levels with qualifier code of ‘j’ following the 

value.
Page 14 of 55

Permit No. WA0029181

Untreated CSO Outfalls

The Permittee must monitor all discharges from the CSO outfalls listed in Special 

Condition S11, not including any CSO treatment plants, using the following monitoring 

schedule. The Permittee must use automatic flow monitoring equipment to collect the 

information required below, and must calibrate flow monitoring equipment according to 

requirements in Condition S2.C. A CSO discharge is defined as any untreated CSO 

which will exit or has exited the CSO outfall.

Table 4. Monitoring Schedule – Untreated CSO Outfalls

Parameter Units Minimum Sampling 

Frequency Sample Type

Volume Discharged MG Per Event a Meter/Calculation b

Discharge Duration Hours Per Event Meter/Calculation

Storm Duration c Hours Per Event Meter/Calculation

Precipitation Inches Per Event Meter/Calculation

Sediments – As specified in Permit Condition S13.C.

a

“Per Event” means a unique flow event as defined in the Permit Writer’s Manual, p. V-30. Ecology defines 

the minimum inter-event period as 24 hours. A CSO event is considered to have ended only after at least 

24 hours has elapsed since the last measured occurrence of an overflow.

b

“Meter/Calculation” means the total volume of the discharge or amount of precipitation event as estimated 

by direct measurement or indirectly by calculation (i.e. flow weirs, pressure transducers, tipping bucket). 

Precipitation must be measured by the nearest possible precipitation-measuring device and actively 

monitored during the period of interest.

c

Storm duration is the total amount of time precipitation occurred that contributed to a discharge event; it is 

determined on a case-by-case basis.

S2.B. Sampling and analytical procedures

Samples and measurements taken to meet the requirements of this permit must 

represent the volume and nature of the monitored parameters. The Permittee must 

conduct representative sampling of any unusual discharge or discharge condition, 

including bypasses, upsets, and maintenance-related conditions that may affect 

effluent quality.

Sampling and analytical methods used to meet the monitoring requirements 

specified in this permit must conform to the latest revision of the Guidelines 

Establishing Test Procedures for the Analysis of Pollutants contained in 40 CFR 

Part 136 (or as applicable in 40 CFR subchapters N [Parts 400–471] or O [Parts 

501-503]) unless otherwise specified in this permit. Ecology may only specify

alternative methods for parameters without permit limits and for those parameters 

without an EPA approved test method in 40 CFR Part 136. 

S2.C. Flow measurement, field measurement, and continuous monitoring devices

The Permittee must:

1. Select and use appropriate flow measurement, field measurement, and 

continuous monitoring devices and methods consistent with accepted 

scientific practices.
Page 15 of 55

Permit No. WA0029181

2. Install and maintain these devices to ensure the accuracy of the measurements 

is consistent with the accepted industry standard and the manufacturer’s 

recommendation for that type of device.

3. Calibrate continuous monitoring instruments consistent with the 

manufacturer’s recommendation.

4. Maintain calibration records for at least three years.

S2.D. Laboratory accreditation

The Permittee must ensure that all monitoring data required by Ecology for permit 

specified parameters is prepared by a laboratory registered or accredited under the 

provisions of chapter 173-50 WAC, Accreditation of Environmental Laboratories. 

Flow, temperature, settleable solids, and internal process control parameters are 

exempt from this requirement. .

S3. Reporting and recording requirements

The Permittee must monitor and report in accordance with the following conditions. 

Falsification of information submitted to Ecology is a violation of the terms and 

conditions of this permit.

S3.A. Reporting

The first monitoring period begins on the effective date of the permit. The 

Permittee must:

1. Summarize, report, and submit monitoring data obtained during each 

monitoring period on the electronic Discharge Monitoring Report (DMR) 

form provided by Ecology within the Water Quality Permitting Portal. Include 

data for each of the parameters tabulated in Special Condition S2 and as 

required by the form. Report a value for each day sampling occurred (unless 

specifically exempted in the permit) and for the summary values (when 

applicable) included on the electronic form. 

To find out more information and to sign up for the Water Quality Permitting 

Portal go to: http://www.ecy.wa.gov/programs/wq/permits/paris/webdmr.html.

2. Enter the “no discharge” reporting code for an entire DMR, for a specific 

monitoring point, or for a specific parameter as appropriate, if the Permittee

did not discharge wastewater or a specific pollutant during a given monitoring 

period. 

3. Report single analytical values below detection as “less than the detection 

level (DL)” by entering < followed by the numeric value of the detection level 

(e.g. < 2.0) on the DMR. If the method used did not meet the minimum DL 

and quantitation level (QL) identified in the permit, report the actual QL and 

DL in the comments or in the location provided.

4. Report the test method used for analysis in the comments if the laboratory

used an alternative method not specified in the permit and as allowed in 

Appendix A.
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Permit No. WA0029181

5. Calculate average values and calculated total values (unless otherwise 

specified in the permit) using:

a. The reported numeric value for all parameters measured between the 

agency-required detection value and the agency-required quantitation 

value. 

b. One-half the detection value (for values reported below detection) if the 

lab detected the parameter in another sample for the reporting period.

c. Zero (for values reported below detection) if the lab did not detect the 

parameter in another sample for the reporting period.

6. Report priority pollutant data on the WQWebDMR form and include sample

date, concentration detected, detection limit (DL) (as necessary), laboratory 

quantitation level (QL) (as necessary), and CAS number. The Permittee must 

also submit an electronic PDF copy of the laboratory report as an attachment

using WQWebDMR. The laboratory report must provide the following 

information: date sampled, sample location, date of analysis, parameter name, 

CAS number, analytical method/number, detection limit (DL), laboratory 

quantitation level (QL), reporting units, and concentration detected. The 

laboratory report must also include information on the chain of custody, 

QA/QC results, and documentation of accreditation for the parameter.

7. Submit DMRs for parameters with the monitoring frequencies specified in S2 

(monthly, quarterly, annual, etc.) at the reporting schedule identified below. 

The Permittee must:

a. Submit monthly DMRs by the 15th day of the following month.

b. Submit annual DMRs by July 31th for the previous calendar year. The 

annual sampling period is the calendar year.

S3.B. Permit submittals and schedules

The Permittee must use the Water Quality Permitting Portal – Permit Submittals

application to submit all other written permit-required reports by the date 

specified in the permit.

When another permit condition requires submittal of a report/file that cannot be 

accepted by the Water Quality Permitting Portal (i.e. video file for outfall 

inspection), the Permittee must ensure that the report/file is postmarked or 

received by Ecology no later than the dates specified by this permit. Send these 

reports/files to Ecology at: 

Water Quality Permit Coordinator

Department of Ecology

Northwest Regional Office

3190 160th Avenue SE

Bellevue, WA 98008-5452
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Permit No. WA0029181

S3.C. Records retention

The Permittee must retain records of all monitoring information for a minimum of 

three (3) years. Such information must include all calibration and maintenance 

records and all original recordings for continuous monitoring instrumentation, 

copies of all reports required by this permit, and records of all data used to 

complete the application for this permit. The Permittee must extend this period of 

retention during the course of any unresolved litigation regarding the discharge of 

pollutants by the Permittee or when requested by Ecology. 

S3.D. Recording of results

For each measurement or sample taken, the Permittee must record the following 

information: 

1. The date, exact place, method, and time of sampling or measurement.

2. The individual who performed the sampling or measurement.

3. The dates the analyses were performed.

4. The individual who performed the analyses.

5. The analytical techniques or methods used and the relevant detection limits.

6. The results of all analyses.

S3.E. Additional monitoring by the Permittee

If the Permittee monitors any pollutant more frequently than required by Special 

Condition S2 of this permit, then the Permittee must include the results of such 

monitoring in the calculation and reporting of the data submitted in the 

Permittee's DMR or annual CSO report, as appropriate. If the Permittee monitors 

sediment or untreated CSO discharges more frequently than required by this 

permit, then the Permittee must enter the results of such monitoring into 

Ecology’s EIM database or include the results in the annual CSO report, as 

appropriate.

S3.F. Reporting permit violations

The Permittee must take the following actions when it violates or is unable to 

comply with any permit condition: 

1. Immediately take action to stop, contain, and cleanup unauthorized discharges 

or otherwise stop the non-compliance and correct the problem.

2. If applicable, immediately repeat sampling and analysis. Submit the results of 

any repeat sampling to Ecology within thirty (30) days of sampling.

a. Immediate reporting

The Permittee must immediately report to Ecology and the Department of 

Health, Shellfish Program, and King County Public Health (at the numbers 

listed below), all:

 Failures of the disinfection systems.

 Collection system overflows other than permitted CSO discharges.
Page 18 of 55

Permit No. WA0029181

 Plant bypasses discharging to marine surface waters, other than as 

described in Section S10.

 Any other failures of the sewage system (pipe breaks, etc.)

Additionally, for any sanitary sewer overflow (SSO) that discharges to

a municipal separate storm sewer system (MS4), the Permittee must notify the 

appropriate MS4 owner or operator.

Northwest Regional Office 425-649-7000

Department of Health, Shellfish Program 360-236-3330 (business hours)

360-789-8962 (after business

hours)

Public Health of Seattle-King County 206-296-4932

b. Twenty-four-hour reporting

The Permittee must report the following occurrences of non-compliance by 

telephone, to Ecology at the telephone numbers listed above, within 24 hours 

from the time the Permittee becomes aware of any of the following 

circumstances: 

1. Any non-compliance that may endanger health or the environment, unless 

previously reported under immediate reporting requirements.

2. Any unanticipated bypass that causes an exceedance of an effluent limit 

in the permit (See Section S5.F, “Bypass Procedures”).

3. Any upset that causes an exceedance of an effluent limit in the permit 

(See G15, “Upset”).

4. Any violation of a maximum daily or instantaneous maximum discharge 

limit for any of the pollutants in Section S1 of this permit for the West 

Point outfall 001.

5. Any overflow prior to the treatment works, whether or not such overflow 

endangers health or the environment or exceeds any effluent limit in the 

permit. 

c. Report within five days

The Permittee must also submit a written report within five business days of 

the time that the Permittee becomes aware of any reportable event under 

subparts a or b, above. The report must contain:

1. A description of the non-compliance and its cause. 

2. The period of non-compliance, including exact dates and times.

3. The estimated time the Permittee expects the non-compliance to continue 

if not yet corrected.

4. Steps taken or planned to reduce, eliminate, and prevent recurrence of the 

non-compliance.
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Permit No. WA0029181

5. If the non-compliance involves an overflow prior to the treatment works, 

an estimate of the quantity (in gallons) of untreated overflow.

d. Waiver of written reports

Ecology may waive the written report required in subpart c, above, on a 

case-by-case basis upon request if the Permittee has submitted a timely oral 

report.

e. All other permit violation reporting

The Permittee must report all permit violations, which do not require 

immediate or within 24 hours reporting, when it submits monitoring reports 

for S3.A ("Reporting"). The reports must contain the information listed in 

subpart c, above. Compliance with these requirements does not relieve the 

Permittee from responsibility to maintain continuous compliance with the 

terms and conditions of this permit or the resulting liability for failure to 

comply.

f. Report submittal

The Permittee must submit reports to the address listed in S3.B.

S3.G. Other reporting

a. Spills of oil or hazardous materials

The Permittee must report a spill of oil or hazardous materials in accordance 

with the requirements of RCW 90.56.280 and chapter 173-303-145. You can 

obtain further instructions at the following website: 

http://www.ecy.wa.gov/programs/spills/other/reportaspill.htm .

b. Failure to submit relevant or correct facts

Where the Permittee becomes aware that it failed to submit any relevant facts 

in a permit application, or submitted incorrect information in a permit 

application, or in any report to Ecology, it must submit such facts or 

information promptly.

S3.H. Maintaining a copy of this permit

The Permittee must keep a copy of this permit at all treatment facilities and make 

it available upon request to Ecology inspectors.

S4. Facility loading (West Point WWTP)

S4.A. Design criteria

The flows or waste loads for the permitted West Point WWTP must not exceed 

the following design criteria:

Maximum Month Design Flow (MMDF) 215 MGD

BOD5 Influent Loading for Maximum Month 201,000 lbs/day

TSS Influent Loading for Maximum Month 218,000 lbs/day
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Permit No. WA0029181

S4.B. Plans for maintaining adequate capacity

a. Conditions triggering plan submittal

The Permittee must submit a plan and a schedule for continuing to maintain 

capacity to Ecology when:

1. The actual flow or waste load reaches 85 percent of any one of the design 

criteria in S4.A for three consecutive months, or

2. The projected plant flow or loading would reach design capacity within 

five years. 

b. Plan and schedule content

The plan and schedule must identify the actions necessary to maintain 

adequate capacity for the expected population growth and to meet the limits 

and requirements of the permit. The Permittee must consider the following 

topics and actions in its plan.

1. Analysis of the present design and proposed process modifications.

2. Reduction or elimination of excessive infiltration and inflow of 

uncontaminated ground and surface water into the sewer system.

3. Limits on future sewer extensions or connections or additional waste 

loads.

4. Modification or expansion of facilities.

5. Reduction of industrial or commercial flows or waste loads.

Engineering documents associated with the plan must meet the requirements 

of WAC 173-240-060, "Engineering Report," and be approved by Ecology 

prior to any construction. 

S4.C. Duty to mitigate

The Permittee must take all reasonable steps to minimize or prevent any 

discharge, use, or disposal of sludge or biosolids in violation of this permit that 

has a reasonable likelihood of adversely affecting human health or the 

environment.

S4.D. Notification of new or altered sources

1. The Permittee must submit written notice to Ecology whenever any new 

discharge or a substantial change in volume or character of an existing 

discharge into the wastewater treatment plant is proposed which:

a. Would interfere with the operation of, or exceed the design capacity of, 

any portion of the wastewater treatment plant.

b. Is not part of an approved general sewer plan or approved plans and

specifications.

c. Is subject to pretreatment standards under 40 CFR Part 403 and Section 

307(b) of the Clean Water Act. 
Page 21 of 55

Permit No. WA0029181

2. This notice must include an evaluation of the wastewater treatment plant’s

ability to adequately transport and treat the added flow and/or waste load, the 

quality and volume of effluent to be discharged to the treatment plant, and the 

anticipated impact on the Permittee’s effluent [40 CFR 122.42(b)]. 

S4.E. Wasteload assessment

The Permittee must conduct wasteload assessments of the West Point WWTP and 

each CSO treatment plant and submit a report to Ecology with the next permit 

application. The Permittee must also submit the report electronically. The report

must contain:

1. A description of compliance or non-compliance with the permit effluent 

limits.

2. A comparison between the existing and design:

a. Monthly average dry weather and wet weather flows.

b. Peak flows.

c. CBOD5 and TSS loadings (West Point only).

d. 5-year average of annual discharge events and annual discharge volume 

for the Alki and Carkeek CSO treatment plants.

3. The percent change in the above parameters since the previous report.

4. The present and design population or population equivalent.

5. The projected population growth rate.

6. The estimated date upon which the Permittee expects the wastewater 

treatment plant to reach design capacity, according to the most restrictive of 

the parameters above. 

S5. Operation and maintenance

The Permittee must at all times properly operate and maintain all facilities and systems of 

treatment and control (and related appurtenances), which are installed to achieve 

compliance with the terms and conditions of this permit. Proper operation and 

maintenance also includes keeping a daily operation logbook (paper or electronic), 

adequate laboratory controls, and appropriate quality assurance procedures. This 

provision of the permit requires the Permittee to operate backup or auxiliary facilities or 

similar systems only when the operation is necessary to achieve compliance with the 

conditions of this permit.

S5.A. Certified operator

These permitted facilities must be operated by an operator certified by the state of 

Washington for at least a Class IV plant. This operator must be in responsible 

charge of the day-to-day operation of the wastewater treatment facilities. An 

operator certified for at least a Class III plant must be in charge during all 

regularly scheduled shifts.
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Permit No. WA0029181

S5.B. Operation and maintenance program

The Permittee must:

1. Maintain the operation and maintenance program for the entire sewage system

under the ownership and control of KC. 

2. Keep maintenance records on all major electrical and mechanical components 

of the treatment plant, as well as the sewage system and pumping stations. 

Such records must clearly specify the frequency and type of maintenance 

recommended by the manufacturer and must show the frequency and type of 

maintenance performed. 

3. Make maintenance records available for inspection at all times. 

S5.C. Short-term reduction

The Permittee must schedule any facility maintenance, which might require 

interruption of wastewater treatment and degrade effluent quality, during 

non-critical water quality periods and carry this maintenance out in a manner 

approved by Ecology.

If a Permittee contemplates a reduction in the level of treatment that would cause 

a violation of permit discharge limits on a short-term basis for any reason, and 

such reduction cannot be avoided, the Permittee must: 

1. Give written notification to Ecology, if possible, thirty (30) days prior to such 

activities. 

2. Detail the reasons for, length of time of, and the potential effects of the 

reduced level of treatment. 

This notification does not relieve the Permittee of its obligations under this 

permit.

S5.D. Electrical power failure

The Permittee must ensure that adequate safeguards prevent the discharge of 

untreated wastes or wastes not treated in accordance with the requirements of this 

permit during electrical power failure at the treatment plant and/or sewage lift 

stations. Adequate safeguards include, but are not limited to, alternate power 

sources, standby generator(s), or retention of inadequately treated wastes. 

The Permittee must maintain Reliability Class II (EPA 430-99-74-001) at the 

wastewater treatment plant. Reliability Class II requires a backup power source 

sufficient to operate all vital components and critical lighting and ventilation 

during peak wastewater flow conditions. Vital components used to support the 

secondary processes (i.e., mechanical aerators or aeration basin air compressors) 

need not be operable to full levels of treatment, but must be sufficient to maintain 

the biota.

S5.E. Prevent connection of inflow

The Permittee must strictly enforce its sewer ordinances and not allow the 

connection of inflow (roof drains, foundation drains, etc.) to the sanitary sewer 

system where under ownership and control of King County. 
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Permit No. WA0029181

S5.F. Bypass procedures

This permit prohibits a bypass, which is the intentional diversion of waste streams 

from any portion of a treatment facility. Ecology may take enforcement action 

against a Permittee for a bypass unless one of the following circumstances (1, 2, 

or 3) applies.

1. Bypass for essential maintenance without the potential to cause violation of 

permit limits or conditions.

This permit authorizes a bypass if it allows for essential maintenance and does 

not have the potential to cause violations of limits or other conditions of this 

permit, or adversely impact public health as determined by Ecology prior to 

the bypass. The Permittee must submit prior notice, if possible, at least ten 

(10) days before the date of the bypass.

2. Bypass which is unavoidable, unanticipated, and results in non-compliance of 

this permit.

This permit authorizes such a bypass only if:

a. Bypass is unavoidable to prevent loss of life, personal injury, or severe 

property damage. “Severe property damage” means substantial physical 

damage to property, damage to the treatment facilities which would cause 

them to become inoperable, or substantial and permanent loss of natural 

resources which can reasonably be expected to occur in the absence of a 

bypass.

b. No feasible alternatives to the bypass exist, such as:

 The use of auxiliary treatment facilities. 

 Retention of untreated wastes.

 Maintenance during normal periods of equipment downtime, but not if 

the Permittee should have installed adequate backup equipment in the 

exercise of reasonable engineering judgment to prevent a bypass. 

 Transport of untreated wastes to another treatment facility or 

preventative maintenance.

c. Ecology is properly notified of the bypass as required in Special Condition 

S3.E of this permit.

3. If bypass is anticipated and has the potential to result in non-compliance of 

this permit.

a. The Permittee must notify Ecology at least thirty (30) days before the 

planned date of bypass. The notice must contain: 

 A description of the bypass and its cause. 

 An analysis of all known alternatives which would eliminate, reduce, 

or mitigate the need for bypassing. 

 A cost-effectiveness analysis of alternatives including comparative 

resource damage assessment. 
Page 24 of 55

Permit No. WA0029181

 The minimum and maximum duration of bypass under each 

alternative.

 A recommendation as to the preferred alternative for conducting the 

bypass. 

 The projected date of bypass initiation. 

 A statement of compliance with SEPA. 

 A request for modification of water quality standards as provided for 

in WAC 173-201A-410, if an exceedance of any water quality 

standard is anticipated. 

 Details of the steps taken or planned to reduce, eliminate, and prevent 

reoccurrence of the bypass.

b. For probable construction bypasses, the Permittee must notify Ecology of 

the need to bypass as early in the planning process as possible. The 

Permittee must consider the analysis required above during preparation of 

the engineering report or facilities plan and plans and specifications and 

must include these to the extent practical. In cases where the Permittee 

determines the probable need to bypass early, the Permittee must continue 

to analyze conditions up to and including the construction period in an 

effort to minimize or eliminate the bypass.

c. Ecology will consider the following prior to issuing an administrative 

order for this type of bypass:

 If the bypass is necessary to perform construction or 

maintenance-related activities essential to meet the requirements of 

this permit.

 If feasible alternatives to bypass exist, such as the use of auxiliary 

treatment facilities, retention of untreated wastes, stopping production, 

maintenance during normal periods of equipment down time, or 

transport of untreated wastes to another treatment facility.

 If the Permittee planned and scheduled the bypass to minimize adverse 

effects on the public and the environment.

After consideration of the above and the adverse effects of the proposed bypass 

and any other relevant factors, Ecology will approve or deny the request. Ecology 

will give the public an opportunity to comment on bypass incidents of significant 

duration, to the extent feasible. Ecology will approve a request to bypass by 

issuing an administrative order under RCW 90.48.120. 

S5.G. Operations and maintenance (O&M) manual

a. O&M manual submittal and requirements

The Permittee must:

1. Review the O&M manuals at least annually.
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Permit No. WA0029181

2. Submit to Ecology for review and approval substantial changes or updates 

to the O&M manuals whenever it incorporates them into the manual. The 

Permittee must submit an electronic copy (preferably as a PDF).

3. Keep the approved O&M manuals at the permitted facility.

4. Follow the instructions and procedures of these manuals.

b. O&M manual components

In addition to the requirements of WAC 173-240-080 (1) through (5), the 

O&M manuals must include:

 Emergency procedures for cleanup in the event of wastewater system 

upset or failure.

 A review of system components which if failed could pollute surface 

water or could impact human health. Provide a procedure for a routine 

schedule of checking the function of these components.

 Wastewater system maintenance procedures that contribute to the 

generation of process wastewater.

 Reporting protocols for submitting reports to Ecology to comply with the 

reporting requirements in the discharge permit.

 Any directions to maintenance staff when cleaning or maintaining other 

equipment or performing other tasks which are necessary to protect the 

operation of the wastewater system (for example, defining maximum 

allowable discharge rate for draining a tank, blocking all floor drains 

before beginning the overhaul of a stationary engine).

 Treatment plant process control monitoring schedules.

S6. Pretreatment

S6.A. General requirements

1. The Permittee must implement the Industrial Pretreatment Program in 

accordance with King County Code 28.84.060 as amended by King County 

Ordinance No. 11963 on January 1, 1996, legal authorities, policies, 

procedures, and financial provisions described in the Permittee's approved 

pretreatment program submittal entitled "Industrial Pretreatment Program" 

and dated April 27, 1981; any approved revisions thereto; and the General 

Pretreatment Regulations (40 CFR Part 403). At a minimum, the Permittee 

must undertake the following pretreatment implementation activities:

a. Enforce categorical pretreatment standards under Section 307(b) and (c) 

of the Federal Clean Water Act (hereinafter, the Act), prohibited 

discharge standards as set forth in 40 CFR 403.5, local limits, or state 

standards, which ever are most stringent or apply at the time of issuance 

or modification of a local industrial waste discharge permit. Locally 

derived limits are defined as pretreatment standards under Section 307(d) 

of the Act and are not limited to categorical industrial facilities.
Page 26 of 55

Permit No. WA0029181

b. Issue industrial waste discharge permits to all significant industrial users 

[SIUs, as defined in 40 CFR 403.3(v)(i)(ii)] contributing to the treatment 

system, including those from other jurisdictions. Industrial waste 

discharge permits must contain as a minimum, all the requirements of 

40 CFR 403.8 (f)(l)(iii). The Permittee must coordinate the permitting 

process with Ecology regarding any industrial facility which may possess 

a state waste discharge permit issued by Ecology. 

c. Maintain and update, as necessary, records identifying the nature, 

character, and volume of pollutants contributed by industrial users to the 

treatment works. The Permittee must maintain records for at least a 

three-year period.

d. Perform inspections, surveillance, and monitoring activities on industrial 

users to determine or confirm compliance with pretreatment standards and 

requirements. The Permittee must conduct a thorough inspection of SIUs 

annually, except Middle-Tier Categorical Industrial Users, as defined by 

40 CFR 403.8(f)(2)(v)(B)&(C), need only be inspected once every two 

years, unless they discharge to a CSO outfall (controlled and uncontrolled) 

located within the Lower Duwamish Waterway cleanup site boundary, in 

which case they must be inspected annually. The Permittee must conduct 

regular local monitoring of SIU wastewaters commensurate with the 

character and volume of the wastewater but not less than once per year 

except for Middle-Tier Categorical Industrial Users which may be 

sampled once every two years. The Permittee must collect and analyze 

samples in accordance with 40 CFR Part 403.12(b)(5)(ii)-(v) and 40 CFR 

Part 136.

e. Enforce and obtain remedies for non-compliance by any industrial users 

with applicable pretreatment standards and requirements. Once violations 

have been identified, the Permittee must take timely and appropriate 

enforcement action to address the non-compliance. The Permittee's action 

must follow its enforcement response procedures and any amendments, 

thereof.

f. Publish, at least annually in a newspaper of general circulation within the 

Permittee's service area, a list of all non-domestic users which, at any time 

in the previous 12 months, were in significant non-compliance as defined 

in 40 CFR 403.8(f)(2)(vii).

g. If the Permittee elects to conduct sampling of an SIU's discharge in lieu 

of requiring user self-monitoring, it must satisfy all requirements of 40 

CFR Part 403.12. This includes monitoring and record keeping 

requirements of sections 403.12(g) and (o). For SIU's subject to 

categorical standards (i.e., CIUs), the Permittee may either complete 

baseline and initial compliance reports for the CIU (when required by 

403.12(b) and (d)) or require these of the CIU. The Permittee must ensure 

SIUs are provided the results of sampling in a timely manner, inform 

SIUs of their right to sample, their obligations to report any sampling 

they do, to respond to non-compliance, and to submit other notifications. 
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Permit No. WA0029181

These include a slug load report (403.12(f)), notice of changed discharge 

(403.12(j)), and hazardous waste notifications (403.12(p)). If sampling 

for the SIU, the Permittee must not sample less than once in every six 

month period unless the Permittee's approved program includes 

procedures for reduction of monitoring for Middle-Tier or 

Non-Significant Categorical Users per 403.12(e)(2) and (3) and those 

procedures have been followed.

h. Develop and maintain a data management system designed to track the 

status of the Permittee's industrial user inventory, industrial user 

discharge characteristics, and compliance status.

i. Maintain adequate staff, funds, and equipment to implement its 

pretreatment program.

j. Establish, where necessary, contracts or legally binding agreements with 

contributing jurisdictions to ensure compliance with applicable 

pretreatment requirements by commercial or industrial users within these 

jurisdictions. These contracts or agreements must identify the agency 

responsible for the various implementation and enforcement activities to 

be performed in the contributing jurisdiction. 

2. Per 40 CFR 403.8(f)(2)(vii), the Permittee must evaluate each Significant 

Industrial User to determine if a Slug Control Plan is needed to prevent slug 

discharges which may cause interference, pass-through, or in any other way 

result in violations of the Permittee’s regulations, local limits or permit 

conditions. The Slug Control Plan evaluation shall occur within one year of a 

user’s designation as a SIU. In accordance with 40 CFR 403.8(f)(1)(iii)(B)(6) 

the Permittee shall include slug discharge control requirements in an SIU’s 

permit if the Permittee determines that they are necessary. 

3. Whenever Ecology determines that any waste source contributes pollutants to 

the Permittee's treatment works in violation of Subsection (b), (c), or (d) of 

Section 307 of the Act, and the Permittee has not taken adequate corrective 

action, Ecology will notify the Permittee of this determination. If the 

Permittee fails to take appropriate enforcement action within 30 days of this 

notification, Ecology may take appropriate enforcement action against the 

source or the Permittee.

4. Pretreatment Report

The Permittee must provide to Ecology an annual report that briefly describes 

its program activities during the previous calendar year. By March 31st, the 

Permittee must send the annual report to Ecology at:

Water Quality Permit Coordinator

Department of Ecology

Northwest Regional Office

3190 160th Avenue SE

Bellevue, WA 98008-5452
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Permit No. WA0029181

The report must include the following information: 

a. An updated listing of non-domestic industrial dischargers. Starting with 

the report submitted in 2016, the list must identify, for each discharger

with a King County discharge authorization (minor or major) or 

discharge permit, the downstream CSO outfall(s) to which the discharger 

contributes, where applicable.

b. Results of wastewater sampling at the treatment plant as specified in 

Subsection S6.B below. The Permittee must calculate removal rates for 

each pollutant and evaluate the adequacy of the existing local limits in 

prevention of treatment plant interference, pass through of pollutants that 

could affect receiving water quality and biosolids contamination.

c. Status of program implementation, including:

i. Any substantial modifications to the pretreatment program as 

originally approved by Ecology, including staffing and funding 

levels.

ii. Any interferences, upsets, or permit violations experienced at the 

WWTP that are directly attributable to wastes from industrial users.

iii. Listing of industrial users inspected and/or monitored, and a 

summary of the results.

iv. Listing of industrial users scheduled for inspection and/or 

monitoring for the next year, and expected frequencies.

v. Listing of industrial users notified of promulgated pretreatment 

standards and/or local standards as required in 40 CFR 

403.8(f)(2)(iii). The list must indicate which industrial users are on 

compliance schedules and the final date of compliance for each.

vi. Listing of industrial users issued industrial waste discharge permits.

vii. Planned changes in the pretreatment program implementation plan.

d. Status of compliance activities, including:

i. Listing of industrial users that failed to submit baseline monitoring 

reports or any other reports required under 40 CFR 403.12 and in the 

Permittee's pretreatment program, dated April 27, 1981.

ii. Listing of industrial users that were at any time during the reporting 

period not complying with federal, state, or local pretreatment 

standards or with applicable compliance schedules for achieving 

those standards, and the duration of such non-compliance.

iii. Summary of enforcement activities and other corrective actions 

taken or planned against non-complying industrial users. The

Permittee must supply to Ecology a copy of the public notice of 

facilities that were in significant non-compliance.
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Permit No. WA0029181

5. The Permittee must request and obtain approval from Ecology before making 

any significant changes to the approved local pretreatment program. The 

Permittee must follow the procedure in 40 CFR 403.18 (b) and (c). 

S6.B. Monitoring requirements

The Permittee must monitor its influent, effluent, and biosolids at the West Point 

WWTP for the priority pollutants identified in Tables II and III of Appendix D of 

40 CFR Part 122 as amended, any compounds identified as a result of Condition 

S6.B.4, and any other pollutants expected from nondomestic sources using U.S. 

EPA-approved procedures for collection, preservation, storage, and analysis. The 

Permittee must test influent, effluent, and biosolids samples for the priority 

pollutant metals (Table III, 40 CFR 122, Appendix D) on a quarterly basis 

throughout the term of this permit. The Permittee must test influent, effluent, and 

biosolids samples for the organic priority pollutants (Table II, 40 CFR 122, 

Appendix D) on an annual basis. 

1. The Permittee must sample West Point WWTP influent and effluent on a day 

when industrial discharges are occurring at normal to maximum levels. The 

Permittee must obtain 24-hour composite samples for the analysis of acid and 

base/neutral extractable compounds and metals. The Permittee must collect 

samples for the analysis of volatile organic compounds and samples must be 

collected using grab sampling techniques at equal intervals for a total of four 

grab samples per day.

The laboratory may run a single analysis for volatile pollutants (using GC/MS 

procedures approved by 40 CFR 136 ) for each monitoring day by 

compositing equal volumes of each grab sample directly in the GC purge and 

trap apparatus in the laboratory, with no less than 1 ml of each grab included 

in the composite.

Unless otherwise indicated, all reported test data for metals must represent the 

total amount of the constituent present in all phases, whether solid, suspended, 

or dissolved, elemental or combined including all oxidation states.

The Permittee must handle, prepare, and analyze all wastewater samples taken 

for GC/MS analysis using procedures approved by 40 CFR 136.

2. The Permittee must collect a biosolids sample concurrently with a wastewater 

sample as a single grab sample of residual biosolids. Sampling and analysis 

must be performed using procedures approved by 40 CFR 136 unless the 

Permittee requests an alternate method and Ecology has approved.

3. The Permittee must take cyanide, phenols, and oils as grab samples. Oils must 

be hexane soluble or equivalent, and should be measured in the influent and 

effluent only.

4. In addition to quantifying pH, oil and grease, and all priority pollutants, the 

Permittee must make a reasonable attempt to identify all other substances and 

quantify all pollutants shown to be present by gas chromatograph/mass 

spectrometer (GC/MS) analysis using procedures approved by 40 CFR 136. 

The Permittee should attempt to make determinations of pollutants for each 
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Permit No. WA0029181

fraction, which produces identifiable spectra on total ion plots (reconstructed 

gas chromatograms). The Permittee should attempt to make determinations 

from all peaks with responses 5% or greater than the nearest internal standard. 

The 5% value is based on internal standard concentrations of 30 g/l, and 

must be adjusted downward if higher internal standard concentrations are used 

or adjusted upward if lower internal standard concentrations are used. The 

Permittee may express results for non-substituted aliphatic compounds as total 

hydrocarbon content. The Permittee must use a laboratory whose computer 

data processing programs are capable of comparing sample mass spectra to a 

computerized library of mass spectra, with visual confirmation by an 

experienced analyst. For all detected substances which are determined to be 

pollutants, the Permittee must conduct additional sampling and appropriate 

testing to determine concentration and variability, and to evaluate trends.

S6.C. Reporting of monitoring results

The Permittee must include a summary of monitoring results in the Annual 

Pretreatment Report.

S6.D. Local limit development

As sufficient data become available, the Permittee must, in consultation with 

Ecology, reevaluate their local limits in order to prevent pass through or 

interference. On a case-by-case basis, as applicable, the Permittee should consider 

the impacts of CSO discharges on the receiving waterbody when establishing 

limits for individual permittees. If Ecology determines that any pollutant present 

causes pass through or interference, or exceeds established biosolids standards, 

the Permittee must establish new local limits or revise existing local limits as 

required by 40 CFR 403.5. Ecology may also require the Permittee to revise or 

establish local limits for any pollutant discharged from the treatment works that 

has a reasonable potential to exceed the water quality standards, sediment 

standards, or established effluent limits, or causes whole effluent toxicity. 

Ecology makes this determination in the form of an Administrative Order.

Ecology may modify this permit to incorporate additional requirements relating to 

the establishment and enforcement of local limits for pollutants of concern. Any 

permit modification is subject to formal due process procedures under state and 

federal law and regulation.

S7. Solid wastes

S7.A. Solid waste handling

The Permittee must handle and dispose of all solid waste material in such a 

manner as to prevent its entry into state ground or surface water.

S7.B. Leachate

The Permittee must not allow leachate from its solid waste material to enter state 

waters without providing all known, available, and reasonable methods of 

treatment, nor allow such leachate to cause violations of the State Surface Water 

Quality Standards, Chapter 173-201A WAC, or the State Ground Water Quality 
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Permit No. WA0029181

Standards, Chapter 173-200 WAC. The Permittee must apply for a permit or 

permit modification as may be required for such discharges to state ground or 

surface waters.

S8. Acute toxicity

S8.A. Acute testing

The Permittee must:

1. Conduct acute toxicity testing on final West Point WWTP effluent during the 

first and third quarters of 2017. 

2. Submit the results to Ecology with the permit renewal application.

3. Conduct acute toxicity testing on a series of at least five concentrations of 

effluent, including 100% effluent and a control.

4. Use each of the following species and protocols for each acute toxicity test:

Acute Toxicity Tests Species Method

Fathead minnow 96-hour 

static-renewal test 

Pimephales promelas EPA-821-R-02-012

Daphnid 48-hour static test Ceriodaphnia dubia, Daphnia 

pulex, or Daphnia magna

EPA-821-R-02-012

S8.B. Sampling and reporting requirements

1. The Permittee must submit all reports for toxicity testing in accordance with 

the most recent version of Ecology Publication No. WQ-R-95-80, Laboratory 

Guidance and Whole Effluent Toxicity Test Review Criteria. Reports must 

contain bench sheets and reference toxicant results for test methods. If the lab 

provides the toxicity test data in electronic format for entry into Ecology’s 

database, then the Permittee must send the data to Ecology along with the test 

report, bench sheets, and reference toxicant results.

2. The Permittee must collect 24-hour composite effluent samples for toxicity 

testing. The Permittee must cool the samples to 0 - 6 degrees Celsius during 

collection and send them to the lab immediately upon completion. The lab 

must begin the toxicity testing as soon as possible but no later than 36 hours 

after sampling was completed.

3. The laboratory must conduct water quality measurements on all samples and 

test solutions for toxicity testing, as specified in the most recent version of 

Ecology Publication No. WQ-R-95-80, Laboratory Guidance and Whole 

Effluent Toxicity Test Review Criteria.

4. All toxicity tests must meet quality assurance criteria and test conditions 

specified in the most recent versions of the EPA methods listed in Subsection

C and the Ecology Publication No. WQ-R-95-80, Laboratory Guidance and 

Whole Effluent Toxicity Test Review Criteria. If Ecology determines any test 

results to be invalid or anomalous, the Permittee must repeat the testing with 

freshly collected effluent.
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Permit No. WA0029181

5. The laboratory must use control water and dilution water meeting the 

requirements of the EPA methods listed in Section A or pristine natural water 

of sufficient quality for good control performance.

6. The Permittee must collect effluent samples for whole effluent toxicity testing 

just prior to the chlorination step in the treatment process.

7. The Permittee may choose to conduct a full dilution series test during 

compliance testing in order to determine dose response. In this case, the series 

must have a minimum of five effluent concentrations and a control. The series 

of concentrations must include the acute critical effluent concentration 

(ACEC). The ACEC equals 3.6 % effluent.

8. All whole effluent toxicity tests that involve hypothesis testing must comply 

with the acute statistical power standard of 29% as defined in WAC 

173-205-020. If the test does not meet the power standard, the Permittee must 

repeat the test on a fresh sample with an increased number of replicates to 

increase the power.

S9. Chronic toxicity

S9.A. Chronic testing

The Permittee must:

1. Conduct chronic toxicity testing on final West Point WWTP effluent during

the second and fourth quarters of 2017.

2. Submit the results to Ecology with the permit renewal application.

3. Conduct chronic toxicity testing on a series of at least five concentrations of 

effluent and a control. This series of dilutions must include the acute critical 

effluent concentration (ACEC). The ACEC equals 3.6% effluent. The series 

of dilutions should also contain the CCEC of 0.53 % effluent.

4. Compare the ACEC to the control using hypothesis testing at the 0.05 level of 

significance as described in Appendix H, EPA/600/4-89/001.

5. Perform chronic toxicity tests with all of the following species and the most 

recent version of the following protocols:

Saltwater Chronic Test Species Method

Topsmelt survival and growth Atherinops affinis EPA/600/R-95/136

Mysid shrimp survival and 

growth

Americamysis bahia (formerly 

Mysidopsis bahia)

EPA-821-R-02-014

S9.B. Sampling and reporting requirements

1. The Permittee must submit all reports for toxicity testing in accordance with 

the most recent version of Ecology Publication No. WQ-R-95-80, Laboratory 

Guidance and Whole Effluent Toxicity Test Review Criteria. Reports must 

contain bench sheets and reference toxicant results for test methods. If the lab 
Page 33 of 55

Permit No. WA0029181

provides the toxicity test data in electronic format for entry into Ecology’s 

database, then the Permittee must send the data to Ecology along with the test 

report, bench sheets, and reference toxicant results.

2. The Permittee must collect 24-hour composite effluent samples for toxicity 

testing. The Permittee must cool the samples to 0 - 6 degrees Celsius during 

collection and send them to the lab immediately upon completion. The lab 

must begin the toxicity testing as soon as possible but no later than 36 hours 

after sampling was completed.

3. The laboratory must conduct water quality measurements on all samples and 

test solutions for toxicity testing, as specified in the most recent version of 

Ecology Publication No. WQ-R-95-80, Laboratory Guidance and Whole 

Effluent Toxicity Test Review Criteria.

4. All toxicity tests must meet quality assurance criteria and test conditions 

specified in the most recent versions of the EPA methods listed in Section C

and the Ecology Publication No. WQ-R-95-80, Laboratory Guidance and 

Whole Effluent Toxicity Test Review Criteria. If Ecology determines any test 

results to be invalid or anomalous, the Permittee must repeat the testing with 

freshly collected effluent.

5. The laboratory must use control water and dilution water meeting the 

requirements of the EPA methods listed in Subsection C or pristine natural 

water of sufficient quality for good control performance.

6. The Permittee must collect effluent samples for whole effluent toxicity testing 

just prior to the chlorination step in the treatment process.

7. The Permittee may choose to conduct a full dilution series test during 

compliance testing in order to determine dose response. In this case, the 

series must have a minimum of five effluent concentrations and a control. 

The series of concentrations must include the CCEC and the ACEC. The 

CCEC and the ACEC may either substitute for the effluent concentrations 

that are closest to them in the dilution series or be extra effluent 

concentrations. The CCEC equals 0.53% effluent. The ACEC equals 3.6% 

effluent.

8. All whole effluent toxicity tests that involve hypothesis testing must comply 

with the chronic statistical power standard of 39% as defined in WAC 

173-205-020. If the test does not meet the power standard, the Permittee 

must repeat the test on a fresh sample with an increased number of replicates 

to increase the power.

S10. Wet weather operation

CSO-related bypass of the secondary treatment portion of the West Point WWTP is 

authorized when the instantaneous flow rate to the WWTP exceeds 300 MGD as a 

result of precipitation events. Bypasses that occur when the instantaneous flow rate is 

less than 300 MGD are not authorized under this condition and are subject to the bypass 

provisions as stated in S5.F of the permit. In the event of a CSO-related bypass 

authorized under this condition, the Permittee must minimize the discharge of 
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Permit No. WA0029181

pollutants to the environment. At a minimum, CSO-related bypass flows must receive 

solids and floatables removal, primary clarification, and disinfection. The final 

discharge must at all times meet the effluent limits of this permit as listed in S1.

The Permittee must maintain records of all CSO-related bypasses at the treatment plant. 

These records must document the date, duration, and volume of each bypass event, and 

the magnitude of the precipitation event. The records must also indicate the effluent flow 

rate at the time when bypassing is initiated. The Permittee must report all occurrences of 

bypassing on a monthly and annual basis. The monthly report must include the above 

information and must be included in narrative form with the discharge monitoring report. 

The annual report must include all of the above information in summary format and 

should be reported in the annual CSO report per S11.C.

S11. Combined sewer overflows

S11.A. Authorized CSO discharge locations 

Beginning on the effective date of this permit, the Permittee may discharge 

combined wastewater and stormwater from the 38 combined sewer overflow 

(CSO) outfalls listed in 

Table 5. These point source discharges occur intermittently when rain events 

overload the combined sewer system. The permit prohibits discharges from the 

CSO outfall sites except as a result of precipitation. This permit does not 

authorize discharges from CSO outfalls that threaten characteristic uses of the 

receiving water as identified in the water quality standards, Chapter 173-201A 

WAC, or that result in an exceedance of the Sediment Management Standards, 

Chapter 173-204 WAC.

Table 5. Permitted CSO outfalls (38)

Outfall

No.

Facility Name Receiving Water Latitude Longitude

003 Ballard Siphon Reg.via Seattle storm drain Lake Washington Ship Canal 47.663916 ̊ -122.382333 ̊

004 11th Ave NW (AKA East Ballard) Lake Washington Ship Canal 47.659491 ̊ -122.370774 ̊

006 Magnolia Overflow Elliott Bay/Puget Sound 47.630184 ̊ -122.399021 ̊

007 Canal Street Overflow Lake Washington Ship Canal 47.651856 ̊ -122.358113 ̊

008 3rd Ave W and Ewing St. Lake Washington Ship Canal 47.652084 ̊ -122.360052 ̊

009 Dexter Ave Regulator Lake Union 47.632273 ̊ -122.339235 ̊

011 E Pine St. PS Emergency Overflow Lake Washington 47.614926 ̊ -122.280304 ̊

012 Belvoir Pump Station Emergency Overflow Lake Washington 47.656698 ̊ -122.287589 ̊

013 MLK Trunkline Overflow - via storm drain Lake Washington 47.523285 ̊ -122.262950 ̊

014 Montlake Overflow Lake Washington Ship Canal 47.647110 ̊ -122.304861 ̊

015 University Regulator Lake Washington Ship Canal 47.648929 ̊ -122.311296 ̊

018 Matthews Park PS Emergency Overflows Lake Washington 47.697458 ̊ -122.272650 ̊

027a Denny Way Regulator Elliott Bay 47.618139 ̊ -122.361888 ̊

028 King Street Regulator Elliott Bay 47.599003 ̊ -122.337425 ̊

029 Kingdome Elliott Bay 47.592532 ̊ -122.342106 ̊

030 Lander St. Regulator Elliott Bay 47.581476 ̊ -122.342997 ̊
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Permit No. WA0029181

Outfall

No.

Facility Name Receiving Water Latitude Longitude

031a, 

b, c

Hanford #1 Overflow - Via Diagonal Storm 

Drain

Duwamish River 47.563108 ̊ -122.345315 ̊

032 Hanford #2 Regulator Duwamish - East Waterway 47.577223 ̊ -122.34278 ̊

033 Rainier Ave Pump Station Lake Washington 47.571374 ̊ -122.27553 ̊

034 E. Duwamish Pump Station Duwamish River 47.562985 ̊ -122.345272 ̊

035 W. Duwamish Pump Station Duwamish River 47.563224 ̊ -122.348256 ̊

036 Chelan Ave Regulator Duwamish - West Waterway 47.573667 ̊ -122.357779 ̊

037 Harbor Avenue Regulator Duwamish to Elliott Bay 47.573706 ̊ -122.361159 ̊

038 Terminal 115 Overflow Duwamish River 47.54826 ̊ -122.340503 ̊

039 Michigan S. Regulator Duwamish River 47.54353 ̊ -122.334967 ̊

040 8th Ave South Reg. (W. Marginal Way PS) Duwamish River 47.533648 ̊ -122.322639 ̊

041 Brandon Street Regulator Duwamish River 47.554661 ̊ -122.340832 ̊

042 Michigan W. Regulator Duwamish River 47.541561 ̊ -122.334994 ̊

043 East Marginal Pump Station Duwamish River 47.537048 ̊ -122.31849 ̊

044a Norfolk Outfall Duwamish River 47.511941 ̊ -122.297356 ̊

045 Henderson Pump Station Lake Washington 47.523285 ̊ -122.26295 ̊

048a,b North Beach Pump Station: a.) wet well, 

b) inlet structure

Puget Sound 47.704007 ̊

47.702142 ̊

-122.392337 ̊

-122.392564 ̊

049 30th Avenue NE Pump Station Lake Washington 47.656698 ̊ -122.287589 ̊

052 53rd Avenue SW Pump Station Puget Sound 47.584799 ̊ -122.402552 ̊

054 63rd Avenue SW Pump Station Puget Sound 47.570016 ̊ -122.416301 ̊

055 SW Alaska Street Overflow Puget Sound 47.559442 ̊ -122.406947 ̊

056 Murray Street Pump Station Puget Sound 47.540275 ̊ -122.400003 ̊

057 Barton Street Pump Station Puget Sound 47.523886 ̊ -122.396393 ̊

S11.B. Nine minimum controls

In accordance with chapter 173-245 WAC and US EPA CSO control policy 

(59 FR 18688), the Permittee must implement and document the following nine 

minimum controls (NMC) for CSOs. The Permittee must document compliance 

with the NMCs in the annual CSO report as required in Special Condition S11.C.

The NMCs are considered technology-based requirements for CSO systems. In 

order to comply with these requirements, the Permittee must:

1. Implement proper operation and maintenance programs for the sewer system 

and all CSO outfalls to reduce the magnitude, frequency, and duration of 

CSOs. The program must consider regular sewer inspections; sewer, catch 

basin, and regulator cleaning; equipment and sewer collection system repair or 

replacement, where necessary; and disconnection of illegal connections.

2. Implement procedures that will maximize use of the collection system for 

wastewater storage that can be accommodated by the storage capacity of the 

collection system in order to reduce the magnitude, frequency, and duration of

CSOs.
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Permit No. WA0029181

3. Review and modify, as appropriate, its existing pretreatment program to 

minimize CSO impacts from the discharges from non-domestic users. Starting 

with its annual Pretreatment Report submitted in 2016, the County must 

include in the report, for each discharger with a King County discharge 

authorization (major or minor) or discharge permit, the downstream CSO 

outfall(s) to which the discharger contributes, where applicable.

4. Operate the wastewater treatment plant at maximum treatable flow during all 

wet weather flow conditions to reduce the magnitude, frequency, and duration 

of CSOs. The Permittee must deliver all flows to the treatment plant within 

the constraints of the treatment capacity of the treatment works.

5. Not discharge overflows from CSO outfalls except as a result of precipitation 

events; dry weather overflows from CSO outfalls are prohibited. The 

Permittee must report each dry weather overflow to the permitting authority 

immediately per Special Condition S3.E. When it detects a dry weather 

overflow, the Permittee must begin corrective action immediately and inspect 

the dry weather overflow each subsequent day until it has eliminated the 

overflow.

6. Implement measures to control solid and floatable materials in CSOs.

7. Implement a pollution prevention program focused on reducing the impact of 

CSOs on receiving waters. Best management practices (BMPs) to control 

pollutant sources in stormwater in CSO basins must be an element of the 

pollution prevention program. Ecology’s Stormwater Management Manual for 

Western Washington (2012) contains appropriate BMPs for reference.

Starting with the Annual CSO Report submitted in 2017, the Permittee must 

include a detailed description of the pollution prevention program, appropriate 

BMPs, and the legal authority and administrative procedures that will be used 

to ensure the program is being implemented. If the legal authority and/or 

administrative procedures are not in place, the Annual CSO Report must 

include a detailed description of the steps needed to establish such a program 

and the timeline for getting the program in place. 

8. Continue to implement the public notification process that informs citizens of 

when and where CSOs occur. The process must continue to include (a) a 

mechanism to alert citizens of CSO occurrences and (b) a system to determine 

the nature and duration of conditions that are potentially harmful for users of 

receiving waters due to CSOs.

9. Monitor CSO outfalls to characterize CSO impacts and the efficacy of CSO 

controls. This must include collection of data to document existing baseline 

conditions and to evaluate the efficacy of the technology-based controls. This 

data must include:

a. Characteristics of the combined sewer system, including the population 

served by the combined portion of the system and locations of all CSO 

outfalls.
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Permit No. WA0029181

b. Total number of CSO events, and the frequency and duration of CSOs for 

all events.

c. Locations and designated uses of receiving water bodies.

d. Water quality data for receiving water bodies.

e. Water quality impacts directly related to CSO (e.g., beach closing, 

floatables, wash-up episodes, fish kills).

S11.C. Combined sewer overflow reporting

1. Monthly CSO Report

The Permittee must submit a monthly report by the 15th of each month that 

includes:

a. Discharge monitoring reports (DMRs) and narrative summaries for each 

CSO treatment plant (Alki, Carkeek, Elliott West, and Henderson), and

b. An event-based summary that includes discharge volume, duration, and 

precipitation for all CSO discharge events that occur during the reporting 

period.

2. Annual CSO Report

The Permittee must submit a CSO Annual Report to Ecology for review by

July 31st of each year. The CSO Annual Report must cover the previous 

calendar year. The report must comply with the requirements of WAC 

173-245-090(1) and must include documentation of compliance with the Nine 

Minimum Controls for CSOs described in Special Condition S11.B. The

Permittee must submit paper and electronic copies of the report, and Excel 

spreadsheet copies of significant spreadsheets. The CSO Annual Report must 

include the following information:

a. A summary of the number and volume of untreated discharge events per 

outfall for that year.

b. A summary of the 20-year moving average number of untreated discharge 

events per outfall, calculated once annually. 

c. An event-based reporting form (provided by Ecology) for all CSO 

discharges for the reporting period, summarizing all data collected 

according to the monitoring schedule in Special Condition S11.B.9.

d. An explanation of the previous year’s CSO reduction accomplishments.

e. A list of CSO reduction projects planned for the next year.

f. A list of which permitted CSO outfalls can be categorized as meeting the 

one untreated discharge per year on a 20-year moving average

performance standard. This annual assessment may be based on historical 

long-term discharge data, modeling, or other reasonable methods as 

approved by Ecology. 
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Permit No. WA0029181

S11.D. Combined sewer overflow reduction plan amendment

The Permittee must submit an amendment of its 2012 Long Term Control Plan 

Amendment (also referred to as a CSO Reduction Plan) to Ecology for review and 

approval with the application for permit renewal. The amendment must comply 

with the requirements of WAC 173-245-090(2).

S11.E. Engineering reports and plans and specifications for CSO reduction projects

The Permittee must submit to Ecology an engineering report for each specific 

CSO reduction construction project. Engineering documents associated with each 

CSO reduction project must meet the requirements of WAC 173-240-060, 

Engineering Report, and be approved by Ecology prior to construction. The report 

must:

1. Specify any contracts, ordinances, methods of financing, or any other 

arrangements necessary to achieve this objective. 

2. Describe how each project will achieve the performance standard of greatest 

reasonable control and explicitly state the expected frequency of overflow 

events per year per associated outfall after the CSO reduction construction 

project has been completed. 

3. Identify the potential hydraulic impacts of the project on downstream 

conveyance and treatment facilities.

For each specific CSO reduction construction project, the Permittee must prepare 

and submit approvable plans and specifications consistent with chapter 

173-240-070 WAC to Ecology for review and approval. Ecology must approve 

plans and specifications prior to construction.

Prior to the start of construction, the Permittee must submit to Ecology a 

construction quality assurance plan as required by chapter 173-240-075 WAC.

S11.F. Requirements for controlled combined sewer overflows

a. CSOs identified as controlled

Based on monitoring data presented in King County’s 2012 Annual CSO 

Report and King County’s 2012 Long Term Control Plan Amendment, the 16 

CSO outfalls listed in Table 6 meet the requirement of “greatest reasonable 

reduction” as defined in chapter WAC 173-245-020(22). Frequency of 

overflow events at these CSO outfalls, as a result of precipitation events, must 

continue to meet the performance standard.
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Permit No. WA0029181

Table 6. Controlled CSO outfalls (16)

CSO 

Outfall 

No

Location/Name Receiving Water Latitude Longitude

007 Canal Street Overflow Lake Washington Ship Canal 47.651856 ̊ -122.358113 ̊

011 E Pine St. PS Emergency Overflow Lake Washington 47.614926 ̊ -122.280304 ̊

012 Belvoir PS Emergency Overflow Lake Washington 47.656698 ̊ -122.287589 ̊

013 MLK Trunkline Overflow - via storm drain Lake Washington 47.523285 ̊ -122.26295 ̊

018 Matthews Park PS Emergency Overflows Lake Washington 47.697458 ̊ -122.27265 ̊

033 Rainier Ave Pump Station Lake Washington 47.571374 ̊ -122.27553 ̊

034 E. Duwamish Pump Station Duwamish River 47.563224 ̊ -122.348256 ̊

035 W. Duwamish Pump Station Duwamish River 47.562986 ̊ -122.345272 ̊

040 8th Ave South Reg. (W Marginal Way PS) Duwamish River 47.533648 ̊ -122.322639 ̊

043 East Marginal Pump Station Duwamish River 47.537048 ̊ -122.31849 ̊

044a Norfolk Outfall Duwamish River 47.511941 ̊ -122.297356 ̊

045 Henderson Pump Station Lake Washington 47.523285 ̊ -122.26295 ̊

049 30th Avenue NE Pump Station Lake Washington 47.656698 ̊ -122.287589 ̊

052 53rd Avenue SW Pump Station Puget Sound 47.584799 ̊ -122.402552 ̊

054 63rd Avenue SW Pump Station Puget Sound 47.570016 ̊ -122.416301 ̊

055 SW Alaska Street Overflow Puget Sound 47.559442 ̊ -122.406947 ̊

b. Performance standards for controlled CSO outfalls

The performance standard for each controlled CSO outfall is not more than 

one discharge event per outfall per year on average, due to precipitation. 

Ecology evaluates compliance with the performance standard annually based 

on a 20 year moving average. The Permittee must report the running 20-year 

average number of overflow events per year during this permit term from

these CSO outfalls in the CSO Annual Report required in Section S11.C.

c. CSO post construction monitoring

The Permittee must continue to implement a post construction compliance 

monitoring program to verify the effectiveness of CSO controls and to 

demonstrate compliance with water quality standards and protection of 

designated uses. The Permittee must follow the approved King County 2012 

Post Construction Monitoring Plan and submit to Ecology for review and 

approval any proposed changes to this plan.

d. CSO post construction monitoring data report

The Permittee must submit to Ecology, by December 1, 2019, a 

post-construction monitoring summary report that demonstrates how each 

CSO outfall listed as controlled in Table 6, as well as those brought under

control during the permit term, achieves performance requirements and 

complies with state water and sediment quality standards. The report must 
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Permit No. WA0029181

conform to the approved CSO Post Construction Monitoring Plan. For 

outfalls with SMS exceedances associated with CSO discharges, the report 

must describe clean-up activities in the vicinity including clean-up actions 

planned or that have been performed, targeted chemicals, any available 

pre- and post-cleanup monitoring results, clean-up project schedule, 

post-project monitoring schedule, and a list of parties involved. 

The outfalls scheduled to be controlled during this permit term and to be 

discussed in the CSO post construction monitoring data report include: Dexter 

Avenue Regulator (DSN 009), Denny Way Regulator (DSN 027a), Harbor 

Avenue Regulator (DSN 037), Ballard Siphon Regulator (DSN 003), Barton 

(DSN 057), Murray (DSN 056), South Magnolia (DSN 006), and North Beach 

(DSN 048). 

S12. Spill control plan

The Permittee must:

1. Review the West Point WWTP Spill Plan at least annually and update as needed.

2. Send updated plans to Ecology when significant changes are made.

3. Follow the plan and any supplements throughout the term of the permit.

The spill control plan must include the following:

1. A list of all oil and petroleum products and other materials used and/or stored on site, 

which when spilled, or otherwise released into the environment, designate as 

dangerous waste (DW) or extremely hazardous waste (EHW) by the procedures set 

forth in WAC 173-303-070. Include other materials used and/or stored on site which 

may become pollutants or cause pollution upon reaching state's waters.

2. A description of preventive measures and facilities (including an overall facility plot 

showing drainage patterns) which prevent, contain, or treat spills of these materials.

3. A description of the reporting system the Permittee will use to alert responsible 

managers and legal authorities in the event of a spill.

4. A description of operator training to implement the plan.

S13. Sediment monitoring 

S13.A. Sediment sampling – West Point WWTP

a. Sediment sampling and analysis plan

The Permittee must submit to Ecology for review and approval a sediment 

sampling and analysis plan for sediment monitoring for the West Point 

WWTP outfall. The Permittee must submit one paper copy and an 

electronic copy (preferably as a PDF) by December 1, 2016. The purpose 

of the plan is to re-characterize sediment quality in the vicinity of the

discharge location.
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Permit No. WA0029181

The Permittee must:

 Follow the guidance provided in the Sediment Source Control Standards 

User Manual, Appendix B: sediment sampling and analysis plan (Ecology, 

2008). Method detection limits must be listed in the plan.

 Collect enough sediment in the top 10 cm at each station to allow for 

conventional parameter testing (percent solids, total organic carbon, 

particle size), chemistry testing, and if necessary, bioassay testing.

Chemistry tests must be performed before bioassay tests and if there are 

Sediment Quality Standard (SQS) exceedances, then bioassay tests must 

be performed.

 Chemistry: Analyze conventional parameters and the full suite of 47 

Sediment Management Standards (SMS) marine chemicals at all stations.

 Bioassay: Perform bioassay tests at all stations with SQS exceedances. 

Run parallel larval echinoderm tests, using standard protocols and screen 

tube manipulation, in order to see if a physical influence from turbidity in 

the overlying test water continues to lead to failed bioassays.

 Stations: Collect samples at the same stations as the previous sampling 

events. Identify the predominant current direction in the vicinity of the 

outfall on all figures.

b. Sediment data report

Following Ecology approval of the Sediment Sampling and Analysis Plan, the 

Permittee must collect sediments between August 15th and September 15th. 

The Permittee must submit to Ecology a Sediment Data Report containing the 

results of the sediment sampling and analysis no later than December 1, 2018. 

The Permittee must submit two paper copies and an electronic copy 

(preferably as a PDF). The sediment data report must conform to the approved 

sediment sampling and analysis plan. 

In addition to a Sediment Data Report, the sediment chemical and biological data 

must be submitted to Ecology’s EIM database (http://www.ecy.wa.gov/eim/), and

Ecology’s MyEIM tools must be used to confirm the accuracy of the submitted 

data (http://www.ecy.wa.gov/eim/MyEIM.htm).

S13.B. Sediment sampling – CSO outfalls

The Permittee must model and/or collect sediment samples in the vicinities of 

controlled CSO outfalls: E. Pine Street Pump Station Emergency Overflow (011), 

Belvoir (012)/30th Ave NE Pump Station (049), Martin Luther King (013)/Henderson 

Pump Station (045), Matthews Park Pump Station Emergency Overflow (018), and 

Rainier Avenue Pump Station Emergency Overflow (033). A sediment sampling and 

analysis plan (SAP) must be submitted by December 1, 2016 in accordance with (a) 

below. Following Ecology approval of the sediment SAP, the Permittee must collect 

sediments according to the SAP. The Permittee must submit to Ecology a sediment 

data report, in accordance with (b) below, that contains the sediment sampling and 

analysis results no later than December 1, 2018.
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Permit No. WA0029181

In addition, the Permittee must model and/or sample sediments in accordance 

with their approved 2012 Post Construction Monitoring Plan or any subsequent 

approved plan revisions. Post construction monitoring of sediments is required 

with the completion of CSO projects once the CSO has been deemed controlled

unless sufficient recent data exists that shows there are no SMS exceedances. An 

exception is made if an area-wide cleanup project is planned with sediment 

sampling scheduled at cleanup project completion. 

For each CSO outfall site that requires sediment monitoring, the Permittee must 

submit a sediment sampling and analysis plan and data report in accordance with

the following.

a. Sediment sampling and analysis plan

The Permittee must submit to Ecology for review and approval a sediment 

sampling and analysis plan (SSAP) for sediment monitoring at least eight 

months prior to sediment testing. The Permittee must submit one paper copy

and an electronic copy (preferably as a PDF). The purpose of the plan is to 

characterize sediment (the nature and extent of chemical contamination and 

biological toxicity) quality in the vicinity of the discharge locations. The SSAP 

must be consistent with the CSO Sediment Quality Characterization Sampling 

and Analysis Plan in Appendix H of the County’s approved Post-Construction 

Monitoring Plan. The Permittee must list method detection limits in the plan.

b. Sediment data report

Following Ecology approval of the Sediment Sampling and Analysis Plan, the 

Permittee must collect sediments according to the plan. The Permittee must 

submit to Ecology a Sediment Data Report containing the results of the 

sediment sampling and analysis no later than ten months after the data was 

collected. The Permittee must submit two paper copies and an electronic copy 

(preferably as a PDF). The sediment data report must conform to the approved 

sediment sampling and analysis plan. 

In addition to a Sediment Data Report, the sediment chemical and biological 

data must be submitted to Ecology’s EIM database (http://www.ecy.wa.gov/eim/), 

and Ecology’s MyEIM tools must be used to confirm the accuracy of the 

submitted data (http://www.ecy.wa.gov/eim/MyEIM.htm).

S13.C. Sediment quality summary at CSO outfalls

The Permittee must submit to Ecology an update to the 2009 Comprehensive 

Sediment Quality Summary Report no later than December 1, 2018. The 2009 

report summarizes sediment data collected at all CSO outfalls including CSO 

treatment plants. The purpose of this update is to keep CSO sediment monitoring 

history information consolidated to help King County and Ecology assess the 

potential for sediment impacts from CSO discharges. 

This update report must provide any new site-specific information including

quantity and quality of the discharges, receiving water characteristics, and new 

knowledge about sediment quality near the CSO outfalls. The report must also 

include a status of sediment cleanup sites and monitoring plans. 
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Permit No. WA0029181

Data not previously submitted and not yet formatted and future data must be 

formatted in the EIM format.

S14. Outfall evaluation

The Permittee must inspect, once during the permit term, the submerged portions of the

West Point WWTP and CSO treatment plant outfall lines and diffusers to document their

integrity and continued function. If conditions allow for a photographic verification, the 

Permittee must include such verification in the reports. The Permittee must submit the 

inspection reports to Ecology with the NPDES Permit renewal application. The inspector 

must at minimum:

 Assess the physical condition of the outfall pipes, diffusers, and associated couplings.

 Determine the extent of sediment accumulation in the vicinity of the diffusers.

 Ensure diffuser ports are free of obstructions and are allowing uniform flow.

 Confirm physical location (latitude/longitude) and depth (at MLLW) of the diffuser 

sections of the outfalls.

 Assess physical condition of anchors used to secure the submarine lines.

 For the West Point WWTP, follow-up on the findings from the 2011 inspection by 

inspecting gaps and checking for leaks at station 30.

S15. Elliott West CSO treatment plant – copper reduction assessment

The Permittee must assess copper discharges from the Elliott West CSO treatment plant

and submit a Copper Reduction Assessment Report to Ecology by November 1, 2018. As 

part of the assessment, the Permittee must:

1. Evaluate sample reliability/accuracy of copper measurements, including potential 

sample interferences, from the Elliott West facility. 

2. Assess copper discharge patterns such as first flush or seasonal (wet season vs. dry 

season) impacts, land use patterns, etc.

3. Conduct a copper source inventory and provide a list of significant copper sources.

4. Provide a description of copper source control options.

5. Examine opportunities for outfall mixing enhancements.

6. Recommend a preferred strategy with corresponding schedule to address copper 

discharges from the Elliott West CSO treatment plant.

S16. Elliott West CSO treatment plant – settleable solids removal assessment

The Permittee must assess settleable solids discharges from the Elliott West CSO 

treatment plant and submit a Settleable Solids Reduction Assessment Report to Ecology 

by November 1, 2018. As part of the assessment, the Permittee must:

1. Assess settleable solids discharge patterns such as seasonal or first flush impacts, 

stormwater vs. domestic wastewater concentrations, etc.
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Permit No. WA0029181

2. Recommend a preferred strategy with corresponding schedule to address settleable

solids discharges from the Elliott West CSO treatment plant in order to meet the 

annual average settleable solids limit.

S17. Application for permit renewal or facility modifications

The Permittee must submit an application for renewal of this permit one year prior to its 

expiration date, or by January 31, 2019. The Permittee must submit a paper copy and an 

electronic copy (preferably as a PDF). 

The Permittee must also submit a new application or application supplement at least one 

hundred eighty (180) days prior to commencement of discharges, resulting from the 

activities listed below, which may result in permit violations. These activities include any 

facility expansions, production increases, or other planned changes, such as process 

modifications, in the permitted facility.
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Permit No. WA0029181

General Conditions

G1. Signatory requirements

1. All applications, reports, or information submitted to Ecology must be signed and 

certified.

a. In the case of corporations, by a responsible corporate officer. For the purpose of 

this section, a responsible corporate officer means:

 A president, secretary, treasurer, or vice-president of the corporation in charge 

of a principal business function, or any other person who performs similar 

policy or decision making functions for the corporation, or 

 The manager of one or more manufacturing, production, or operating 

facilities, provided, the manager is authorized to make management decisions 

which govern the operation of the regulated facility including having the 

explicit or implicit duty of making major capital investment 

recommendations, and initiating and directing other comprehensive measures 

to assure long-term environmental compliance with environmental laws and 

regulations; the manager can ensure that the necessary systems are established 

or actions taken to gather complete and accurate information for permit 

application requirements; and where authority to sign documents has been 

assigned or delegated to the manager in accordance with corporate 

procedures. 

b. In the case of a partnership, by a general partner.

c. In the case of sole proprietorship, by the proprietor.

d. In the case of a municipal, state, or other public facility, by either a principal 

executive officer or ranking elected official.

Applications for permits for domestic wastewater facilities that are either owned or 

operated by, or under contract to, a public entity shall be submitted by the public 

entity.

2. All reports required by this permit and other information requested by Ecology must 

be signed by a person described above or by a duly authorized representative of that 

person. A person is a duly authorized representative only if:

a. The authorization is made in writing by a person described above and submitted 

to Ecology.

b. The authorization specifies either an individual or a position having responsibility 

for the overall operation of the regulated facility, such as the position of plant 

manager, superintendent, position of equivalent responsibility, or an individual or 

position having overall responsibility for environmental matters. (A duly 

authorized representative may thus be either a named individual or any individual 

occupying a named position.)

3. Changes to authorization. If an authorization under paragraph G1.2, above, is no 

longer accurate because a different individual or position has responsibility for the 

overall operation of the facility, a new authorization satisfying the requirements of 
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Permit No. WA0029181

paragraph G1.2, above, must be submitted to Ecology prior to or together with any 

reports, information, or applications to be signed by an authorized representative.

4. Certification. Any person signing a document under this section must make the 

following certification:

I certify under penalty of law, that this document and all attachments were prepared 

under my direction or supervision in accordance with a system designed to assure 

that qualified personnel properly gathered and evaluated the information submitted. 

Based on my inquiry of the person or persons who manage the system or those 

persons directly responsible for gathering information, the information submitted is, 

to the best of my knowledge and belief, true, accurate, and complete. I am aware that 

there are significant penalties for submitting false information, including the 

possibility of fine and imprisonment for knowing violations.

G2. Right of inspection and entry

The Permittee must allow an authorized representative of Ecology, upon the presentation 

of credentials and such other documents as may be required by law:

1. To enter upon the premises where a discharge is located or where any records must be 

kept under the terms and conditions of this permit.

2. To have access to and copy, at reasonable times and at reasonable cost, any records 

required to be kept under the terms and conditions of this permit.

3. To inspect, at reasonable times, any facilities, equipment (including monitoring and 

control equipment), practices, methods, or operations regulated or required under this 

permit.

4. To sample or monitor, at reasonable times, any substances or parameters at any 

location for purposes of assuring permit compliance or as otherwise authorized by the 

Clean Water Act.

G3. Permit actions

This permit may be modified, revoked and reissued, or terminated either at the request of 

any interested person (including the Permittee) or upon Ecology’s initiative. However, 

the permit may only be modified, revoked and reissued, or terminated for the reasons 

specified in 40 CFR 122.62, 40 CFR 122.64 or WAC 173-220-150 according to the 

procedures of 40 CFR 124.5. 

1. The following are causes for terminating this permit during its term, or for denying a 

permit renewal application:

a. Violation of any permit term or condition.

b. Obtaining a permit by misrepresentation or failure to disclose all relevant facts.

c. A material change in quantity or type of waste disposal.

d. A determination that the permitted activity endangers human health or the 

environment, or contributes to water quality standards violations and can only be 

regulated to acceptable levels by permit modification or termination.
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Permit No. WA0029181

e. A change in any condition that requires either a temporary or permanent 

reduction, or elimination of any discharge or biosolids use or disposal practice 

controlled by the permit.

f. Nonpayment of fees assessed pursuant to RCW 90.48.465.

g. Failure or refusal of the Permittee to allow entry as required in RCW 90.48.090.

2. The following are causes for modification but not revocation and reissuance except 

when the Permittee requests or agrees:

a. A material change in the condition of the waters of the state.

b. New information not available at the time of permit issuance that would have 

justified the application of different permit conditions.

c. Material and substantial alterations or additions to the permitted facility or 

activities which occurred after this permit issuance.

d. Promulgation of new or amended standards or regulations having a direct bearing 

upon permit conditions, or requiring permit revision.

e. The Permittee has requested a modification based on other rationale meeting the 

criteria of 40 CFR Part 122.62.

f. Ecology has determined that good cause exists for modification of a compliance 

schedule, and the modification will not violate statutory deadlines.

g. Incorporation of an approved local pretreatment program into a municipality’s 

permit.

3. The following are causes for modification or alternatively revocation and reissuance:

a. When cause exists for termination for reasons listed in 1.a through 1.g of this 

section, and Ecology determines that modification or revocation and reissuance is 

appropriate.

b. When Ecology has received notification of a proposed transfer of the permit. A 

permit may also be modified to reflect a transfer after the effective date of an 

automatic transfer (General Condition G7) but will not be revoked and reissued 

after the effective date of the transfer except upon the request of the new 

Permittee.

G4. Reporting planned changes

The Permittee must, as soon as possible, but no later than one hundred eighty (180) days 

prior to the proposed changes, give notice to Ecology of planned physical alterations or 

additions to the permitted facility, production increases, or process modification which 

will result in:

1. The permitted facility being determined to be a new source pursuant to 40 CFR 

122.29(b)

2. A significant change in the nature or an increase in quantity of pollutants discharged.

3. A significant change in the Permittee’s biosolids use or disposal practices. Following 

such notice, and the submittal of a new application or supplement to the existing 
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Permit No. WA0029181

application, along with required engineering plans and reports, this permit may be 

modified, or revoked and reissued pursuant to 40 CFR 122.62(a) to specify and limit 

any pollutants not previously limited. Until such modification is effective, any new or 

increased discharge in excess of permit limits or not specifically authorized by this 

permit constitutes a violation.

G5. Plan review required

Prior to constructing or modifying any wastewater control facilities, an engineering report 

and detailed plans and specifications must be submitted to Ecology for approval in 

accordance with chapter 173-240 WAC. Engineering reports, plans, and specifications 

must be submitted at least one hundred eighty (180) days prior to the planned start of 

construction unless a shorter time is approved by Ecology. Facilities must be constructed 

and operated in accordance with the approved plans.

G6. Compliance with other laws and statutes

Nothing in this permit excuses the Permittee from compliance with any applicable 

federal, state, or local statutes, ordinances, or regulations. 

G7. Transfer of this permit

In the event of any change in control or ownership of facilities from which the authorized 

discharge emanate, the Permittee must notify the succeeding owner or controller of the 

existence of this permit by letter, a copy of which must be forwarded to Ecology.

1. Transfers by Modification

Except as provided in paragraph (2) below, this permit may be transferred by the 

Permittee to a new owner or operator only if this permit has been modified or revoked 

and reissued under 40 CFR 122.62(b)(2), or a minor modification made under 40 

CFR 122.63(d), to identify the new Permittee and incorporate such other 

requirements as may be necessary under the Clean Water Act.

2. Automatic Transfers

This permit may be automatically transferred to a new Permittee if:

a. The Permittee notifies Ecology at least thirty (30) days in advance of the proposed 

transfer date.

b. The notice includes a written agreement between the existing and new Permittees 

containing a specific date transfer of permit responsibility, coverage, and liability 

between them. 

c. Ecology does not notify the existing Permittee and the proposed new Permittee of 

its intent to modify or revoke and reissue this permit. A modification under this 

subparagraph may also be minor modification under 40 CFR 122.63. If this notice 

is not received, the transfer is effective on the date specified in the written 

agreement.
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Permit No. WA0029181

G8. Reduced production for compliance

The Permittee, in order to maintain compliance with its permit, must control production 

and/or all discharges upon reduction, loss, failure, or bypass of the treatment facility until 

the facility is restored or an alternative method of treatment is provided. This requirement 

applies in the situation where, among other things, the primary source of power of the 

treatment facility is reduced, lost, or fails.

G9. Removed substances

Collected screenings, grit, solids, sludges, filter backwash, or other pollutants removed in 

the course of treatment or control of wastewaters must not be resuspended or 

reintroduced to the final effluent stream for discharge to state waters. 

G10. Duty to provide information

The Permittee must submit to Ecology, within a reasonable time, all information which 

Ecology may request to determine whether cause exists for modifying, revoking and 

reissuing, or terminating this permit or to determine compliance with this permit. The 

Permittee must also submit to Ecology upon request, copies of records required to be kept 

by this permit. 

G11. Other requirements of 40 CFR

All other requirements of 40 CFR 122.41 and 122.42 are incorporated in this permit by 

reference.

G12. Additional monitoring

Ecology may establish specific monitoring requirements in addition to those contained in 

this permit by administrative order or permit modification.

G13. Payment of fees

The Permittee must submit payment of fees associated with this permit as assessed by 

Ecology.

G14. Penalties for violating permit conditions

Any person who is found guilty of willfully violating the terms and conditions of this 

permit is deemed guilty of a crime, and upon conviction thereof shall be punished by a 

fine of up to ten thousand dollars ($10,000) and costs of prosecution, or by imprisonment 

in the discretion of the court. Each day upon which a willful violation occurs may be 

deemed a separate and additional violation. 

Any person who violates the terms and conditions of a waste discharge permit may incur, 

in addition to any other penalty as provided by law, a civil penalty in the amount of up to 

ten thousand dollars ($10,000) for every such violation. Each and every such violation is 

a separate and distinct offense, and in case of a continuing violation, every day's 

continuance is deemed to be a separate and distinct violation.
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Permit No. WA0029181

G15. Upset

Definition – “Upset” means an exceptional incident in which there is unintentional and 

temporary non-compliance with technology-based permit effluent limits because of 

factors beyond the reasonable control of the Permittee. An upset does not include noncompliance to the extent caused by operational error, improperly designed treatment 

facilities, inadequate treatment facilities, lack of preventive maintenance, or careless or 

improper operation.

An upset constitutes an affirmative defense to an action brought for non-compliance with 

such technology-based permit effluent limits if the requirements of the following 

paragraph are met.

A Permittee who wishes to establish the affirmative defense of upset must demonstrate, 

through properly signed, contemporaneous operating logs, or other relevant evidence that: 

1. An upset occurred and that the Permittee can identify the cause(s) of the upset.

2. The permitted facility was being properly operated at the time of the upset.

3. The Permittee submitted notice of the upset as required in Special Condition S3.F.

4. The Permittee complied with any remedial measures required under S3.F of this permit.

In any enforcement action the Permittee seeking to establish the occurrence of an upset 

has the burden of proof.

G16. Property rights

This permit does not convey any property rights of any sort, or any exclusive privilege.

G17. Duty to comply

The Permittee must comply with all conditions of this permit. Any permit non-compliance

constitutes a violation of the Clean Water Act and is grounds for enforcement action; for 

permit termination, revocation and reissuance, or modification; or denial of a permit 

renewal application.

G18. Toxic pollutants

The Permittee must comply with effluent standards or prohibitions established under 

Section 307(a) of the Clean Water Act for toxic pollutants within the time provided in the 

regulations that establish those standards or prohibitions, even if this permit has not yet 

been modified to incorporate the requirement.

G19. Penalties for tampering

The Clean Water Act provides that any person who falsifies, tampers with, or knowingly 

renders inaccurate any monitoring device or method required to be maintained under this 

permit shall, upon conviction, be punished by a fine of not more than $10,000 per violation, 

or by imprisonment for not more than two (2) years per violation, or by both. If a conviction 

of a person is for a violation committed after a first conviction of such person under this 

condition, punishment shall be a fine of not more than $20,000 per day of violation, or by 

imprisonment of not more than four (4) years, or by both.
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Permit No. WA0029181

G20. Compliance schedules

Reports of compliance or non-compliance with, or any progress reports on, interim and 

final requirements contained in any compliance schedule of this permit must be submitted 

no later than fourteen (14) days following each schedule date.

G21. Service agreement review

The Permittee must submit to Ecology any proposed service agreements and proposed 

revisions or updates to existing agreements for the operation of any wastewater treatment 

facility covered by this permit. The review is to ensure consistency with chapters 90.46 

and 90.48 RCW as required by RCW 70.150.040(9). In the event that Ecology does not 

comment within a thirty-day (30) period, the Permittee may assume consistency and 

proceed with the service agreement or the revised/updated service agreement.
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Permit No. WA0029181

Appendix A 

LIST OF POLLUTANTS WITH ANALYTICAL METHODS, DETECTION LIMITS AND QUANTITATION LEVELS 

The Permittee must use the specified analytical methods, detection limits (DLs) and quantitation levels (QLs) in the following table for 

permit and application required monitoring unless:

 Another permit condition specifies other methods, detection levels, or quantitation levels.

 The method used produces measurable results in the sample and EPA has listed it as an EPA-approved method in 40 CFR 

Part 136, or EPA has granted the laboratory written permission to use the method.

 The Permittee knows that an alternate, less sensitive method (higher DL and QL) from those listed below is sufficient to 

produce measurable results in their effluent.

 If the Permittee is unable to obtain the required DL and QL due to matrix effects (such as for treatment plant influent or CSO 

effluent), the Permittee must strive to achieve to lowest possible DL and QL and report the DL and QL in the required report.

If the Permittee uses an alternative method, not specified in the permit and as allowed above, it must report the test method, DL, and 

QL on the discharge monitoring report or in the required report.

All pollutants that have numeric limits in Section S1 of this permit must be analyzed with the methods specified below. When the permit 

requires the Permittee to measure the base neutral compounds in the list of priority pollutants, it must measure all of the base neutral 

pollutants listed in the table below. The list includes EPA required base neutral priority pollutants and several additional polynuclear 

aromatic hydrocarbons (PAHs). The Water Quality Program added several PAHs to the list of base neutrals below from Ecology’s 

Persistent Bioaccumulative Toxics (PBT) List. It only added those PBT parameters of interest to Appendix A that did not increase the 

overall cost of analysis unreasonably.

Ecology added this appendix to the permit in order to reduce the number of analytical “non-detects” in permit-required monitoring and to 

measure effluent concentrations near or below criteria values where possible at a reasonable cost.

CONVENTIONAL PARAMETERS

Pollutant & CAS No. (if available) Recommended Analytical 

Protocol

Detection (DL)1 

μg/L unless 

specified

Quantitation Level 

(QL) 2 μg/L unless 

specified

Biochemical Oxygen Demand SM5210-B 2 mg/L

Total Suspended Solids SM2540-D 5 mg/L

Total Ammonia (as N) SM4500-NH3-B and C/D/E/G/H

Kerouel & Aminot 1997

0.3 mg/L

Dissolved oxygen SM4500-OC/OG 0.2 mg/L

Temperature (max. 7-day avg.) Analog recorder or use microrecording devices known as 

thermistors

0.2o C

pH SM4500-H

+ B N/A N/A

NONCONVENTIONAL PARAMETERS

Pollutant & CAS No. (if available) Recommended Analytical 

Protocol

Detection (DL)1

μg/L unless 

specified

Quantitation Level 

(QL)2 μg/L unless 

specified

Total Alkalinity SM2320-B 1.3 mg/L as CaCO3

Chlorine, Total Residual SM4500 Cl G

4500 Cl D/E, Hach 8370

50.0

Fecal Coliform SM 9221E,9222 N/A Specified in method -

sample aliquot 

dependent

Nitrate + Nitrite Nitrogen (as N) SM4500-NO3- E/F/H 200

Nitrogen, Total Kjeldahl (as N) SM4500-NorgB/C and SM4500NH3-

B/C/D/EF/G/H

EPA 351.2

500
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Permit No. WA0029181

Pollutant & CAS No. (if available) Recommended Analytical 

Protocol

Detection (DL)1

μg/L unless 

specified

Quantitation Level 

(QL)2 μg/L unless 

specified

Nitrogen, Total (as N) SM4500-N-C 50 100

Soluble Reactive Phosphorus (as P) SM4500- PE/PF 100 100

Phosphorus, Total (as P) SM 4500 PB followed by SM4500-

PE/PF

100 300

Oil and Grease (HEM) 1664 A or B 1,400 5,000

Salinity SM2520-B 3 practical salinity 

units or scale (PSU or 

PSS)

Settleable Solids SM2540 -F Sample and limit 

dependent

Sulfate (as mg/L SO4) SM4110-B, 4500-SO4 E 7.1 mg/L

Sulfide (as mg/L S) SM4500-S

2

F/D/E/G 200

Sulfite (as mg/L SO3) SM4500-SO3B 2000

Total dissolved solids SM2540 C 20 mg/L

Total Hardness SM2340B C, 

200.7, 200.8

200 as CaCO3

Aluminum, Total (7429-90-5) 200.8 2.0 10

Barium Total (7440-39-3) 200.8 0.5 2.0

BTEX (benzene +toluene + ethylbenzene + 

m,o,p xylenes)

EPA SW 846 8021/8260 1 2

Boron Total (7440-42-8) 200.8 2.0 10.0

Cobalt, Total (7440-48-4) 200.8 0.05 0.25

Iron, Total (7439-89-6) 200.7, 200.8 12.5 50

Magnesium, Total (7439-95-4) 200.7, 200.8 10 50

Molybdenum, Total (7439-98-7) 200.8 0.1 0.5

Manganese, Total (7439-96-5) 200.8 0.1 0.5

NWTPH Dx 4Ecology NWTPH Dx 250 250

NWTPH Gx 5Ecology NWTPH Gx 250 250

Tin, Total (7440-31-5) 200.8 0.3 1.5

Titanium, Total (7440-32-6) 200.8 0.5 2.5

METALS, CYANIDE & TOTAL PHENOLS

Antimony, Total (7440-36-0) 200.8 0.3 1.0

Arsenic, Total (7440-38-2) 200.8 0.1 0.5

Beryllium, Total (7440-41-7) 200.8 0.1 0.5

Cadmium, Total (7440-43-9) 200.8 0.05 0.25

Chromium (hex) dissolved (18540-29-9) SM3500-Cr B 5 10

Chromium, Total (7440-47-3) 200.8 0.2 1.0

Copper, Total (7440-50-8) 200.8 0.4 2.0

Lead, Total (7439-92-1) 200.8 0.1 0.5

Mercury, Total (7439-97-6) 1631E 0.0002 0.0005

Nickel, Total (7440-02-0) 200.8 0.1 0.5

Selenium, Total (7782-49-2) 200.8 1.0 1.0

Silver, Total (7440-22-4) 200.8 0.04 0.2

Thallium, Total (7440-28-0) 200.8 0.09 0.36

Zinc, Total (7440-66-6) 200.8 0.5 2.5

Cyanide, Total (57-12-5) 335.4, SM4500-CN-C,E 5 10

Cyanide, Weak Acid Dissociable SM4500-CN I 5 10

Cyanide, Free Amenable to Chlorination 

(Available Cyanide)

SM4500-CN G 5 10

Phenols, Total EPA 420.1 50

ACID COMPOUNDS

2-Chlorophenol (95-57-8) 625 1.0 2.0

2,4-Dichlorophenol (120-83-2) 625 0.5 1.0
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Permit No. WA0029181

2,4-Dimethylphenol (105-67-9) 625 0.5 1.0

4,6-dinitro-o-cresol (534-52-1) 

(2-methyl-4,6,-dinitrophenol)

625/1625B 2.0 4.0

2,4 dinitrophenol (51-28-5) 625 1.5 3.0

2-Nitrophenol (88-75-5) 625 0.5 1.0

4-nitrophenol (100-02-7) 625 1.0 2.0

Parachlorometa cresol (59-50-7) 

(4-chloro-3-methylphenol)

625 1.0 2.0

Pentachlorophenol (87-86-5) 625 0.5 1.0

Phenol (108-95-2) 625 2.0 4.0

2,4,6-Trichlorophenol (88-06-2) 625 2.0 4.0

VOLATILE COMPOUNDS

Acrolein (107-02-8) 624 5 10

Acrylonitrile (107-13-1) 624 1.0 2.0

Benzene (71-43-2) 624 1.0 2.0

Bromoform (75-25-2) 624 1.0 2.0

Carbon tetrachloride (56-23-5) 624/601 or SM6230B 1.0 2.0

Chlorobenzene (108-90-7) 624 1.0 2.0

Chloroethane (75-00-3) 624/601 1.0 2.0

2-Chloroethylvinyl Ether (110-75-8) 624 1.0 2.0

Chloroform (67-66-3) 624 or SM6210B 1.0 2.0

Dibromochloromethane (124-48-1) 624 1.0 2.0

1,2-Dichlorobenzene (95-50-1) 624 1.9 7.6

1,3-Dichlorobenzene (541-73-1) 624 1.9 7.6

1,4-Dichlorobenzene (106-46-7) 624 4.4 17.6

Dichlorobromomethane (75-27-4) 624 1.0 2.0

1,1-Dichloroethane (75-34-3) 624 1.0 2.0

1,2-Dichloroethane (107-06-2) 624 1.0 2.0

1,1-Dichloroethylene (75-35-4) 624 1.0 2.0

1,2-Dichloropropane (78-87-5) 624 1.0 2.0

1,3-dichloropropene (mixed isomers) (1,2-

dichloropropylene) (542-75-6) 6

624 1.0 2.0

Ethylbenzene (100-41-4) 624 1.0 2.0

Methyl bromide (74-83-9) (Bromomethane) 624/601 5.0 10.0

Methyl chloride (74-87-3) (Chloromethane) 624 1.0 2.0

Methylene chloride (75-09-2) 624 5.0 10.0

1,1,2,2-Tetrachloroethane (79-34-5) 624 1.9 2.0

Tetrachloroethylene (127-18-4) 624 1.0 2.0

Toluene (108-88-3) 624 1.0 2.0

1,2-Trans-Dichloroethylene 

(156-60-5) (Ethylene dichloride)

624 1.0 2.0

1,1,1-Trichloroethane (71-55-6) 624 1.0 2.0

1,1,2-Trichloroethane (79-00-5) 624 1.0 2.0

Trichloroethylene (79-01-6) 624 1.0 2.0

Vinyl chloride (75-01-4) 624/SM6200B 1.0 2.0

BASE/NEUTRAL COMPOUNDS (compounds in bold are Ecology PBTs)

Acenaphthene (83-32-9) 625 0.2 0.4

Acenaphthylene (208-96-8) 625 0.3 0.6

Anthracene (120-12-7) 625 0.3 0.6

Benzidine (92-87-5) 625 20 40

Benzyl butyl phthalate (85-68-7) 625 0.3 0.6

Benzo(a)anthracene (56-55-3) 625 0.3 0.6

Benzo(b)fluoranthene 

(3,4-benzofluoranthene) (205-99-2) 7

610/625 0.8 1.6

Benzo(j)fluoranthene (205-82-3) 7

625 0.5 1.0

Benzo(k)fluoranthene 

(11,12-benzofluoranthene) (207-08-9) 7

610/625 0.8 1.6

Benzo(r,s,t)pentaphene (189-55-9) 625 1.3 5.0

Benzo(a)pyrene (50-32-8) 610/625 0.5 1.0
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Permit No. WA0029181

Benzo(ghi)Perylene (191-24-2) 610/625 0.5 1.0

Bis(2-chloroethoxy)methane (111-91-1) 625 5.3 21.2

Bis(2-chloroethyl)ether (111-44-4) 611/625 0.3 1.0

Bis(2-chloroisopropyl)ether (39638-32-9) 625 0.5 1.0

Bis(2-ethylhexyl)phthalate (117-81-7) 625 0.3 1.0

4-Bromophenyl phenyl ether (101-55-3) 625 0.3 0.5

2-Chloronaphthalene (91-58-7) 625 0.3 0.6

4-Chlorophenyl phenyl ether (7005-72-3) 625 0.3 0.5

Chrysene (218-01-9) 610/625 0.3 0.6

Dibenzo (a,h)acridine (226-36-8) 610M/625M 2.5 10.0

Dibenzo (a,j)acridine (224-42-0) 610M/625M 2.5 10.0

Dibenzo(a-h)anthracene 

(53-70-3)(1,2,5,6-dibenzanthracene)

625 0.8 1.6

Dibenzo(a,e)pyrene (192-65-4) 610M/625M 2.5 10.0

Dibenzo(a,h)pyrene (189-64-0) 625M 2.5 10.0

3,3-Dichlorobenzidine (91-94-1) 605/625 2.0 4.0

Diethyl phthalate (84-66-2) 625 1.9 7.6

Dimethyl phthalate (131-11-3) 625 1.6 6.4

Di-n-butyl phthalate (84-74-2) 625 0.5 1.0

2,4-dinitrotoluene (121-14-2) 609/625 1.0 2.0

2,6-dinitrotoluene (606-20-2) 609/625 1.0 2.0

Di-n-octyl phthalate (117-84-0) 625 0.3 0.6

1,2-Diphenylhydrazine (as Azobenzene)(122-66-7) 1625B, 625 5.0 20

Fluoranthene (206-44-0) 625 0.3 0.6

Fluorene (86-73-7) 625 0.3 0.6

Hexachlorobenzene (118-74-1) 612/625 0.3 0.6

Hexachlorobutadiene (87-68-3) 625 0.5 1.0

Hexachlorocyclopentadiene (77-47-4) 1625B/625 2.0 4.0

Hexachloroethane (67-72-1) 625 0.5 1.0

Indeno(1,2,3-cd)Pyrene (193-39-5) 610/625 0.5 1.0

Isophorone (78-59-1) 625 0.5 1.0

3-Methyl cholanthrene (56-49-5) 625 2.0 8.0

Naphthalene (91-20-3) 625 0.4 0.75

Nitrobenzene (98-95-3) 625 0.5 1.0

N-Nitrosodimethylamine (62-75-9) 607/625 2.0 4.0

N-Nitrosodi-n-propylamine (621-64-7) 607/625 0.5 1.0

N-Nitrosodiphenylamine (86-30-6) 625 1.0 2.0

Perylene (198-55-0) 625 1.9 7.6

Phenanthrene (85-01-8) 625 0.3 0.6

Pyrene (129-00-0) 625 0.3 0.6

1,2,4-Trichlorobenzene (120-82-1) 625 0.3 0.6

DIOXIN

2,3,7,8-Tetra-Chlorodibenzo-P-Dioxin 

(176-40-16) (2,3,7,8 TCDD)

1613B 1.3 pg/L 5 pg/L

1. Detection level (DL) or detection limit means the minimum concentration of an analyte (substance) that can be measured and 

reported with a 99% confidence that the analyte concentration is greater than zero as determined by the procedure given in 40 CFR 

part 136, Appendix B.

2. Quantitation Level (QL) also known as Minimum Level of Quantitation (ML) – The smallest detectable concentration of analyte 

greater than the Detection Limit (DL) where the accuracy (precision & bias) achieves the objectives of the intended purpose. (Report 

of the Federal Advisory Committee on Detection and Quantitation Approaches and Uses in Clean Water Act Programs Submitted to 

the US Environmental Protection Agency, December 2007).

3. Soluble Biochemical Oxygen Demand method note: First, filter the sample through a Millipore Nylon filter (or equivalent) - pore size 

of 0.45-0.50 um (prep all filters by filtering 250 ml of laboratory grade deionized water through the filter and discard). Then, analyze 

sample as per method 5210-B. 

4. NWTPH Dx

- Northwest Total Petroleum Hydrocarbons Diesel Extended Range – see http://www.ecy.wa.gov/biblio/97602.html

5. NWTPH Gx - Northwest Total Petroleum Hydrocarbons Gasoline Extended Range – see http://www.ecy.wa.gov/biblio/97602.html

6. 1, 3-dichloroproylene (mixed isomers) - You may report this parameter as two separate parameters: cis-1, 3-dichlorpropropene 

(10061-01-5) and trans-1, 3-dichloropropene (10061-02-6). 

7. Total Benzofluoranthenes - Because Benzo(b)fluoranthene, Benzo(j)fluoranthene and Benzo(k)fluoranthene co-elute you may report 

these three isomers as total benzofluoranthenes.