TagPollution Control Hearings Board(1532)

This August 2001 draft document outlines Water Quality Certification conditions for Sea-Tac International Airport (STIA), requiring the Port of Seattle to implement a Comprehensive Stormwater Management Plan covering treatment, flow control, and retrofitting of stormwater facilities. Key requirements include obtaining Ecology approval before discharging operational stormwater to state waters, conducting a Water Effects Ratio Study, and ensuring all runoff from impervious surfaces is treated using all known available and reasonable treatment methods. The Port must also retrofit existing stormwater facilities at a rate proportional to new impervious surface construction, with progress documented in quarterly reports.

Letter dated August 3, 2001 from Pam Bissonnette, Director of King County Department of Natural Resources, to Ann Kenny, Senior Permit Specialist at Washington Department of Ecology Northwest Regional Office, conveying King County’s technical review findings on the Port Of Seattle’s Comprehensive Stormwater Management Plan (SMP) for Master Plan Update (MPU) Improvements at Seattle-Tacoma International

This August 2001 draft document outlines Water Quality Certification conditions (#1996-4-02325) governing stormwater management at Seattle-Tacoma International Airport (Sea-Tac). It sets requirements for the Port of Seattle to implement and maintain a Comprehensive Stormwater Management Plan, including retrofitting existing impervious surfaces, meeting state water quality standards, and obtaining Ecology approval before discharging stormwater to receiving waters. The document also addresses scheduling, flow control benchmarks, and the use of all known available and reasonable treatment methods (AKART) for runoff from impervious surfaces.

In August 2001, King County's Department of Natural Resources wrote to the Washington Department of Ecology confirming that the Port of Seattle's Comprehensive Stormwater Management Plan for Sea-Tac International Airport Master Plan improvements met the technical requirements of the 1998 King County Surface Water Design Manual. The review found that the plan demonstrated a feasible conceptual strategy for managing stormwater from proposed airport construction projects. Reviewers noted that while the plan showed compliance with design standards, additional oversight and monitoring would be needed as individual projects moved from planning into construction.

Letter dated August 3, 2001 from King County Department of Natural Resources Director Pam Bissonnette to Ann Kenny, Senior Permit Specialist, Washington Department of Ecology Northwest Regional Office, transmitting King County’s technical review comments on the Port Of Seattle’s Low Flow Impact Analysis – Low Flow Impact Offset Facility Proposal (July 2001). The enclosure provides

In this August 3, 2001 email, Andrea Grad, a paralegal at Helsell Fetterman, submits a Public Disclosure Act (PDA) request to Ann Kenny at the Washington State Department of Ecology. Grad notes that several sections of the Port of Seattle's two-volume Low Flow Analysis — including the Introduction and the section on Determination of Impacts to Streamflow — were either incomplete or entirely missing from the copy provided by Ecology. She asks Ecology to confirm whether the Port had submitted the missing sections, and requests copies of any such materials.

This August 2001 King County review evaluates the Port of Seattle's Low Flow Impact Analysis and proposed Flow Impact Offset Facility, which aims to mitigate reductions in stream flows in local creeks—including Des Moines, Miller, and Walker creeks—caused by future airport development. The review finds that while the proposed water storage and augmentation measures substantially offset low-flow impacts during the critical late-summer period, there are significant gaps in documentation, biological assessment, and design details that need to be addressed. Recommendations include professional engineering certification, enhanced biological monitoring, improved calibration documentation, and refinements to the reserve storage facility designs.

Internal email from Ann Kenny (Ecology) to Ching-Pi Wang, cc Steve Alexander (ECY) and Raymond Hellwig, dated August 2, 2001, transmitting deliberative draft Section 401 water quality certification conditions F1–F4 for the Sea-Tac Airport (STIA) Third Runway Master Plan Update. Conditions address prevention of contaminated groundwater transport from the Airport Maintenance and Operations Area via

Email from Dianne Pastore, Ecology Director’s Office, to Raymond Hellwig and Curt Hart (cc: Thomas Fitzsimmons, Sheryl Hutchison) requesting briefing materials for Tom Fitzsimmons’ meeting with the Governor and Paul Isaki on the SeaTac 3rd Runway Project. Materials requested by Dennis Clark, Governor’s Office, by COB Tuesday August 7, 2001. AR 017821, Exhibit 96.

Washington State Department of Ecology Water Quality Program publication numbers 99-11 through 99-15, August 2001. Stormwater Management Manual for Western Washington covering five volumes: Volume I Minimum Technical Requirements and Site Planning, Volume II Construction Stormwater Pollution Prevention, Volume III Hydrologic Analysis and Flow Control Design/BMPs, Volume IV Source Control BMPs, Volume V Runoff Treatment