WA ST Dept of Ecology 2/15/2022 - Laserfiche WebLink

Table 6. Bubbled Action Levels for Corrective Action Assessment Jurisdiction Bubbled Action Level, TIN lbs/year King County 15,820,000 C. NITROGEN OPTIMIZATION PLAN AND REPORT Each Permittee listed in Table 5 must develop, implement and maintain a Nitrogen Optimization Plan to evaluate operational strategies for maximizing nitrogen removal from the existing treatment plant to stay below the calculated action level. Each Permittee must document their actions taken, any action level exceedances, and apply an adaptive management approach at the WWTP. Permittees will quantify results with required monitoring under this Permit. The Permittee must begin the actions described in this section immediately upon permit coverage. Documentation of Nitrogen Optimization Plan implementation must be submitted annually through the Annual Report (S9- Reporting Requirements). See Appendix C for Annual Report questions that satisfy the Nitrogen Optimization Plan requirements. The Nitrogen Optimization Plan submitted by each Permittee in Table 5 must include the following components: 1. Treatment Process Performance Assessment Assess the nitrogen removal potential of the current treatment process and identify viable optimization strategies prior to implementation. a. Treatment Assessment Develop a method to evaluate potential optimization approaches for the existing treatment process. Use the evaluation to: i. Determine current (pre-optimization) process performance to determine the existing TIN removal performance for the WWTP. ii. Create a list of potential optimization strategies capable of meeting the action level at the WWTP prior to starting optimization. Update the assessment and list of options as necessary with each Annual Report. b. Identify and evaluate optimization strategies. From the list developed in S4.C.1.a.ii, identify viable optimization strategies for each WWTP owned and operated by the Permittee. Prioritize and update this list as necessary to continuously maintain a working set of strategies for meeting the action level with the existing treatment processes. The Permittee may exclude any optimization strategy from the initial list created in S4.C.a.ii that was considered but found to exceed a reasonable implementation cost or timeframe. Documentation must include an explanation of the rationale and financial criteria used in the exclusion determination. If the Permittee finds no viable optimization strategies exist Puget Sound Nutrient General Permit Page 13