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

3. Influent Nitrogen Reduction Measures/Source Control Permittees in Table 11 must investigate opportunities to reduce influent TIN loads from septage handling practices, commercial, dense residential and industrial sources and submit documentation with the Annual Report. The investigation must: a. Review non-residential sources of nitrogen and identify any possible pretreatment opportunities. b. Identify strategies for reducing TIN from new multi-family/dense residential developments and commercial buildings. C. AKART ANALYSIS 1. Permittees in Table 11, except for those who meet the exclusions listed in this paragraph, must prepare and submit an approvable all known, available and reasonable treatment (AKART) analysis to Ecology for purposes of evaluating reasonable treatment alternatives capable of reducing total inorganic nitrogen (TIN). Permittees must submit this report by December 31, 2025. Permittees that maintain an annual TIN average of< 10 mg/L and do not document an increase in load through their DMRs do not have to submit this analysis. 2. The analysis must contain appropriate requirements as described in the following guidance (or the most recent version): a. The Criteria for Sewage Works Design (ECY Publication No. 98-37, 2019)9 b. Reclaimed Water Facilities Manual: The Purple Book (ECY Publication No. 15- 10-024, 2019)10 3. The AKART analysis must include the following elements: a. Wastewater Characterization i. Current volumes, flowrates and growth trends ii. Current influent and effluent quality b. Treatment Technology Analysis i. Description of current treatment processes ii. Identification and screening of potential treatment technologies for TIN reduction that achieves AKART for nitrogen removal c. Economic Evaluation https://apps.ecology.wa.gov/publications/documents/9837.pdf io https://apps.ecology.wa.gov/publications/SummaryPages/1510024.html Puget Sound Nutrient General Permit Page 30