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Exhibit 221: WQP Policy 1-22 — Adopting Supplemental Treatment as a Best Management Practice and Defining Compliance with Water Quality Standards for Stormwater Impacts for the Water Quality and SEA Programs

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This 2000 Washington State Department of Ecology policy document establishes procedures for how stormwater discharges must comply with water quality standards under Sections 401 and 402 of the Federal Clean Water Act. It outlines how Best Management Practices (BMPs), including Supplemental Treatment, should be applied to control stormwater pollution, and defines how compliance decisions are made for various permit types. The policy applies to Ecology Water Quality and SEA Program staff when reviewing or permitting projects that have stormwater impacts.

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Notes

Exhibit 221 (AR 018842–018844, ECY00009241–ECY00009243). Email chain dated November 6–7, 2000 from Raymond Hellwig (Ecology) forwarding revised stormwater policy to Kevin Fitzpatrick and Ann Kenny, with attached WQP Policy 1-22 (effective March 31, 2000, authored by Sandra Manning and Bill Moore). Policy governs Ecology Water Quality and SEA Program staff when reviewing or permitting projects with stormwater impacts under Sections 401 and 402 of the Federal Clean Water Act. Defines compliance with WAC 173-201A-160(3) via Best Management Practices (BMPs) including Supplemental Treatment BMP; addresses compliance requirements for Individual State 402 NPDES permits, General 402 Stormwater permits (municipal and construction), and 401 Water Quality Certifications; covers 303(d) listed parameters, ESA species requirements, anti-degradation provisions for wetlands, and conditions for holding 401 Certifications in abeyance. Filed in PCHB Third Runway EIS administrative record.

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