Notes
Exhibit 233 (AR 018943–018944). Letter dated April 30, 2001 from William A. Rozeboom, P.E., Northwest Hydraulic Consultants Inc., to Washington State Department of Ecology Water Quality Program (Kevin Fitzpatrick) and Shorelands and Environmental Assistance Program (Ann Kenny), on behalf of the Airport Communities Coalition (ACC). Comments on proposed major modification to NPDES Permit No. WA-002465-1 for the Port of Seattle, Seattle-Tacoma International Airport (Sea-Tac). Two specific issues: (1) Permit Conditions S1.E and S5.B lack enforceable IWS (Integrated Wastewater/Stormwater) system design criteria for authorized bypass overflows into the storm drain system; recommends republication for public comment with IWS performance expectations including overflow frequency and duration. (2) Permit Condition S14 (page 47 of 53) sets a stormwater detention standard referencing the Stormwater Management Manual for the Puget Sound Basin that is less stringent than SMP Section 2.1.4 ‘updated’ detention standards sought under Section 401 Certification for the Third Runway and Master Plan Update projects; recommends NPDES permit be amended to require updated standards for all new and retrofit construction. Affected waterbodies: Miller Creek and Des Moines Creek. Filed in PCHB Third Runway EIS administrative record.