1. Spokane County Wastewater Toxics Monitoring – Year One April 24, 2013 | DRAFT

2. NPDES permit requirements Sampling locations & methods Results Next steps (draft) Draft Action submitted to Ecology on 4/15/2013 Agenda Brown and Caldwell | DRAFT 2

3. Spokane Area – Sewer Service DowntownSpokane Spokane Valley North Spokane ▲N▲N City of Spokane Riverside Park Water Reclamation Facility... serves North Spokane Spokane County Regional Water Reclamation Facility... serves Spokane Valley Brown and Caldwell | DRAFT 3

4. S2 requires monitoring of Spokane County Regional Water Reclamation Facility (SCRWRF) influent and effluent NPDES Permit Special Conditions Brown and Caldwell | DRAFT 4 Wastewater Influent Sampling ConstituentEPA MethodLocation DescriptionMinimum Sampling FrequencySample Type Total PCBs1668Each influent trunk lineBimonthly (6/year)24-hour time-weighted composite 2,3,7,8-TCDD1613Each influent trunk lineBimonthly (6/year)24-hour time-weighted composite PBDE1614Each influent trunk line1 per quarter24-hour time-weighted composite Wastewater Effluent Sampling ConstituentEPA MethodLocation DescriptionMinimum Sampling FrequencySample Type Total PCBs1668 After last treatment process 1 per quarter24-hour time-weighted composite 2,3,7,8-TCDD1613 After last treatment process 1 per quarter24-hour time-weighted composite PBDE1614 After last treatment process 1 per quarter24-hour time-weighted composite

5. S9 requires preparation of a Quality Assurance Project Plan (QAPP) S12 requires development of a plan with a goal of reducing to the maximum extent practicable PCB loads in the County’s wastewater collection system Influent sample results are needed to help identify PCB sources NPDES Special Permit Conditions (cont’d) Brown and Caldwell | DRAFT 5

6. Sampling Locations – Year One Brown and Caldwell | DRAFT 6 Spokane Valley Interceptor Sampling Location North Valley Interceptor Sampling Location Effluent Sampling Location

7. Sampling Location – Spokane Valley Interceptor (SVI) Pump Station Brown and Caldwell | DRAFT 7

8. Sampling Location – North Valley Interceptor (NVI) Pump Station Brown and Caldwell | DRAFT 8

9. Sampling Location – SCRWRF Effluent Brown and Caldwell | DRAFT 9

10. Sampling Procedures Brown and Caldwell | DRAFT 10 Sampler Calibration Sampler Intake Automated Sampler Composite Sample Bottle Teflon Tubing

11. Table 2-4. Laboratory Results for 2, 3, 7, 8-TCDD for First Three Events (pg/L) Location 2,3,7,8-TCDD concentration (pg/L) Event 1Event 2Event 3 NVI< 0.522 U< 0.515 U< 0.519 U SVI< 0.516 U< 0.519 U< 0.503 U SVI duplicateNT< 0.827 KJNT Effluent< 0.517 UNT< 0.543 U Effluent duplicateNT < 0.517 U NVI rinsate< 0.503 UNT< 0.515 U SVI rinsate< 0.507 UNT Effluent rinsate< 0.504 UNT Travel blank< 0.581 U< 0.534 U< 0.549 U Lab blank< 0.500 U 2,3,7,8-TCDD Results Brown and Caldwell | DRAFT 11 NT = not tested U flags indicate the substance was not detected at the reporting level. K flags indicate a peak was detected but did no meet qualification criteria. The result reported is the estimated maximum possible concentration J flags indicate that the sample concentration was lower than the lowest calibration equivalent

12. Total PBDE Concentrations (pg/L) for Events 1 and 3 NVI NVI Duplicate SVI SVI Duplicate Effluent NVI rinsate SVI rinsate Effluent rinsate Travel blank Lab blank Event 1133,581NT321,819338,2981,3741192891007598 Event 350,72155,928210,199NT789657NT 3,411 PBDE Results Brown and Caldwell | DRAFT 12 NT: Not tested

13. PBDE Results Brown and Caldwell | DRAFT 13 Influent

14. PBDE Homologs – Influent Samples Brown and Caldwell | DRAFT 14

15. PCB Results Brown and Caldwell | DRAFT 15 Total PCB Concentrations (pg/L) for First Three Events NVI NVI Duplicate SVIEffluentNVI rinsateSVI rinsate Effluent rinsate Travel blank Lab blank Event 111,51510,99810,563243314229178202614 Event 212,455NT9,384NT 463NT9758 Event 38,415NT10,32824875NT 8372 NT: Not tested

16. PCB Results Brown and Caldwell | DRAFT 16 Influent

17. PCB Homologs - Influent Samples Brown and Caldwell | DRAFT 17

18. PCB Aroclor Results – Influent Samples Brown and Caldwell | DRAFT 18

19. Table 2-11. Common Uses of Aroclors Common uses Aroclor 1016122112321242124812541260 Adhesives Capacitors Carbonless copy paper Chlorinated rubber Crepe rubber Cutting oils Dedusting agents Epoxy resins Ethylene vinyl acetate Gas transmission turbines Heat transfer Hydraulic fluid Inks Neoprene Nitrocellulose lacquers Pesticide extenders Polyester resin Polystyrene Polyvinyl acetate Polyvinyl chloride Rubber Sealants and caulking compounds Styrene-butadiene co-polymers Synthetic resins Transformers Vacuum pumps Varnish Wax Wax extenders Sources: Nagpal (1992), ATSDR (2000) Common Uses of Aroclors Brown and Caldwell | DRAFT 19

20. Work with Ecology to update the QAPP Begin trackdown sampling in collection system upstream of NVI and SVI pump stations Next Steps (Draft) Brown and Caldwell | DRAFT 20 Wastewater in County collection system

21. “Top-down” strategy - focus on known or suspected sources “Bottom-up” strategy- systematic downstream to upstream approach Potential Trackdown Strategies (Draft) Brown and Caldwell | DRAFT 21

22. Land Uses by Basin Brown and Caldwell | DRAFT 22

23. Proposed Trackdown Approach (Draft) Brown and Caldwell | DRAFT 23

24. Proposed Trackdown Locations for 2013 (Draft) Brown and Caldwell | DRAFT 24

25. Questions? Brown and Caldwell 25

26. PCB Monitoring Considerations Brown and Caldwell | DRAFT 26

27. Potential PCB Sources Brown and Caldwell | DRAFT 27

28. Potential PCB Sources Brown and Caldwell | DRAFT 28

29. Potential PCB Sources Brown and Caldwell 29

30. Potential PCB sources Brown and Caldwell | DRAFT 30