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iii. Any adaptive management applied to refine implementation during the <br /> reporting period. <br /> iv. Anticipated and unanticipated challenges. <br /> v. Any impacts to the overall treatment performance as a result of process <br /> changes. <br /> b. Discharge Evaluation. By March 31 each year beginning in 2023, each <br /> Permittee in Table 8 must review effluent data collected during the previous <br /> calendar year to determine whether TIN loads are increasing. <br /> i. Using all accredited monitoring data, determine facility's annual average <br /> TIN concentration and load from the reporting period. If the annual TIN <br /> load exceeds the Action Level in Table 8 (or the applicable bubbled <br /> Action Level in Table 9) take the corrective actions in S5.D. <br /> ii. Determine the treatment plant's TIN removal rate observed during the <br /> reporting period. <br /> 3. Influent Nitrogen Reduction Measures/Source Control <br /> Permittees in Table 8 must investigate opportunities to reduce influent TIN loads <br /> from septage handling practices, commercial, dense residential and industrial <br /> sources and submit documentation with the Annual Report. The investigation <br /> must: <br /> a. Review non-residential sources of nitrogen and identify any possible <br /> pretreatment opportunities. <br /> b. Identify potential strategies for reducing TIN from new multi-family/dense <br /> residential developments and commercial buildings. <br /> D. ACTION LEVEL EXCEEDANCE CORRECTIVE ACTIONS <br /> Permittees in Table 8 must evaluate whether or not they exceeded the facility specific <br /> action level or the bubbled action level (as applicable) and, if they did, implement <br /> corrective actions while continuing optimization. <br /> 1. If the Permittee determines in the Annual Report that they have exceeded their <br /> action level, they must: <br /> a. Identify possible factors that caused the action level exceedance. <br /> b. Identify whether modifications to the optimization strategy can improve <br /> performance. <br /> c. Assess whether a different strategy or combination of strategies may provide <br /> better overall process improvements. <br /> d. Document changes made to the optimization strategy, if any, while <br /> completing corrective action requirements. <br /> Puget Sound Nutrient General Permit Page 22 <br />