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Stantec August 6,2019 Page 3 of 14 Task 200 Regulatory Requirements Stantec will work with City staff to review existing discharge limitations and prohibitions and potential future changes to those requirements affected by Washington State Department of Ecology(Ecology) regulation. Subtask 200.001 Current Effluent Discharge Requirements Stantec will summarize the existing effluent discharge requirements contained in National Pollutant Discharge Elimination System (NPDES)Waste Discharge Permit (WDP) No.WA0024490. Subtask 200.002 Future Regulatory Changes The purpose of this task is to evaluate potential future regulatory changes and assess their impacts on performance criteria and discharge standards for the WPCF.At this time,the Stantec team understands the potential for nutrients to be included in receiving water assimilative capacity assessments or maximum daily load calculations conducted by Ecology,which could lead to new effluent limits for pollutants of concern in that category.Stantec and City staff will meet with Ecology staff to discuss future regulatory direction. In collaboration with the City and Ecology,Stantec will develop recommended benchmarks(concentration and/or loading)to use as guidelines for identifying and evaluating treatment process improvements,and estimated timeframes for regulatory changes to be used in phasing capital improvements. If necessary,Stantec will suggest sampling and analysis activities which the City may wish to undertake in order to collect sufficient data to document existing conditions, both in the City's effluent and the receiving waters to which that effluent is discharged. In addition to nutrient limitations,Stantec will identify other potential regulatory changes and assess their potential to impact future treatment needs at the WPCF.These potential future regulatory requirements include legacy chemicals; persistent,toxic and bioaccumulating chemicals;and per-and polyfluoroalkyl substances(PEAS).These topics will be raised at a meeting with Ecology staff to discuss future regulatory direction. Stantec will provide a summary of the degree to which the WPCF may be affected by potential regulation of these compounds by Ecology. An assessment of the possible impact of potential new requirements on the WPCF will be provided. This assessment will be based on the most recent direction available from Ecology and relevant examples from regulated communities outside of Washington. This range will be used to select and assess long- term alternatives considered in the Liquid Stream Alternatives Analyses(Task 500). Subtask 200.003 Biosolids Regulations Stantec will summarize Ecology's biosolids regulations (WAC 173-308)to inform alternatives considered in Task 600 and identify potential future regulations that may impact biosolids treatment and reuse requirements. Subtask 200.004 Reuse Regulations Stantec will summarize Ecology's reuse regulations(WAC 173-219)to inform alternatives considered in Task 500 and identify potential future regulations that may impact effluent reuse. Subtask 200.005 Environmental Regulations Environmental documentation and permitting requirements relevant to modification and operation of the WPCF will be summarized.