HDR Engineering, Inc. 1/20/2023 - Laserfiche WebLink

6 documentation of the operational conditions at the treatment facility and the status of optimization efforts associated with the monitoring data. • The City will participate in coordination meetings and review of draft annual reports and the Nutrient Reduction Evaluation (NRE). • Meetings will be held virtually or in-person at City offices,or as a mix or virtual and in- person attendance. • The City will be responsible for submitting the final Annual Reports to Ecology. Deliverables • Working Draft Nitrogen Optimization Plan • Draft and final Annual Reports for calendar years 2022 - 2026. • Draft and final Nutrient Reduction Evaluation (NRE). Task 2.0 NPDES Permit Review and Support Discharges to the Snohomish River and Puget Sound are subject to a number of regulatory compliance requirements that include Technology Based Effluent Limits (TBELs) and Water Quality Based Effluent Limits (WQBELs). The TBELs are the base requirements for secondary treatment that govern effluent limitations for Biochemical Oxygen Demand (BOD), Total Suspended Solids (TSS), and pH. The WQBELs result from application of Ecology’s water quality standards to site specific discharge conditions including Ammonia Nitrogen, Fecal Coliform Bacteria, and Total Residual Chlorine. Future WQBELs may include Total Inorganic Nitrogen, Enterococcus Bacteria (E. coli), metals, PCBs, and other regulated compounds, and potentially unregulated compounds that may be included in future water quality standards rulemaking such as PBDE, PFAS, etc. The permit support activities are focused on the following: • NPDES Permit review (Permit, Fact Sheets, and SEPA) • Calculations for comparing pollutant loadings to nearshore vs deepwater (for CSO alternatives analysis) The original scope of work for the Discharge Water Quality/Planning Assistance On-Call contract included the following: 2.1 Permitting Support and Strategy Provide assistance to the City for their work with Ecology on the Puget Sound Nutrient General Permit and collective work with other agencies. Assistance includes advising the City on defining optimization for nutrient treatment, efforts with the Puget Sound Clean Water Alliance, scoping and work for the Puget Sound Institute, sampling for PBDE and other permit renewal and plant compliance issues during the term of the contract. 2.2 Review draft permit application Review the current permit application that was submitted to Ecology in April of 2020, and other plant monitoring and process data as appropriate.