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

a. Review non-residential sources of nitrogen and identify any possible pretreatment opportunities. b. Identify potential strategies for reducing TIN from new multi-family/dense residential developments and commercial buildings. D. ACTION LEVEL EXCEEDANCE CORRECTIVE ACTIONS Permittees in Table 5 must evaluate whether or not they exceeded the facility specific action level or the bubbled action level (as applicable) and, if they did, implement corrective actions while continuing optimization. 1. If the Permittee determines in the Annual Report that they have exceeded their action level, they must: a. Identify possible factors that caused the action level exceedance. b. Identify whether modifications to the optimization strategy can improve performance. c. Assess whether a different strategy or combination of strategies may provide better overall process improvements. d. Document changes made to the optimization strategy, if any, while completing corrective action requirements. i. Provide a detailed description of the modified or new optimization strategy selected from the list developed in S4.C.1.b. Include an implementation schedule for any changes and, as necessary, use the treatment process assessment developed to evaluate anticipated results. ii. If the Permittee proposes no changes to the optimization strategy, they must provide reasons for not making changes. 2. With the next Annual Report, submit for review a proposed approach to reduce the annual effluent load by at least 10% below the action level listed in Table 5 for individual plants or Table 6 for multiple plants under a bubbled action level. This must be an abbreviated engineering report or technical memo, unless Ecology has previously approved a design document with the proposed solution. The proposed approach must utilize solutions that can be implemented as soon as possible. This may include influent load reduction strategies identified in S4.C.3. The engineering document must include: i. Brief summary of the treatment alternatives considered and why the proposed approach was selected. Include cost estimates for operation and maintenance; ii. The basic design information, including influent characterization; iii. A description of the proposed treatment approach and operation, including updates to the WWTP's process flow diagram; Puget Sound Nutrient General Permit Page 15