TagStormwater(373)

Port Of Seattle report (AR 043696, Volume 1) examining effects of runway deicing chemicals on dissolved oxygen in receiving waters at Seattle-Tacoma International Airport for the 1999-2000 winter season. Documents ground deicing chemical applications including potassium acetate (PA, Cryotech E36 LRD), sodium acetate (SA), and calcium magnesium acetate (CMA) on airfield, ramp, and landside roadways.

Final draft meeting notes prepared by Kate Snider of Floyd & Snider Inc. for the Sea-Tac Airport Third Runway 401 Permit Negotiations meeting held October 31, 2000, 8:00–11:00 AM. Attendees included representatives from Washington State Department of Ecology (Ray Hellwig, Kevin Fitzpatrick, Ann Kenny), Port Of Seattle (Michael Cheyne, Elizabeth Leavitt, Keith Smith), King County

These draft meeting notes from October 27, 2000 document technical negotiations between the Port of Seattle and the Washington Department of Ecology regarding the 401 water quality permit for the Sea-Tac Airport Third Runway project. The meeting covered topics including stormwater management planning, base flow impacts, Tyee Pond buffer requirements, and staffing for permit review. A master list of technical issues was maintained to track which items had been resolved, were pending additional information, or required further discussion.

A 2000 engineering memorandum from HNTB and Hart Crowser advises the Third Runway Design Team against artificially increasing stormwater infiltration within the proposed runway embankment. The memo warns that enhanced infiltration would raise risks of slope instability, soil liquefaction during earthquakes, and long-term maintenance problems that could not be remedied once the embankment was built. The engineers concluded that these safety and structural risks outweighed any stormwater detention benefits that increased infiltration might provide.

Resume of Paul S. Fendt, P.E. (Parametrix), dated October 26, 2000, detailing over 16 years of stormwater engineering and planning experience. Projects include Valley Creek Estuary Restoration (Port of Port Angeles, WA), Stormwater Pollution Prevention Plans (SWPPP) for Potlatch Corporation (Lewiston, ID) and Port of Vancouver (Columbia River, WA), stormwater treatment system design for Port

A October 25, 2000 internal memo from Tom Luster to Ann Kenny outlines the transition of the 401 water quality certification review for the Sea-Tac Airport expansion project. It covers key outstanding issues including flow augmentation, water quality BMPs, and Clean Air Act compliance, as well as coordination needs with the Army Corps of Engineers, EPA, and WDFW. The memo also addresses document management, public disclosure requests, and contract administration changes related to the King County Stormwater Review.

Email exchange dated October 24, 2000 between Ann Kenny (Ecology NWRO, 425-649-4310) and Rachel McCrea of Floyd & Snider, Inc. regarding Third Runway 401 permit negotiations with Port Of Seattle. McCrea informs Kenny she will be replacing Tom Luster in the 401 permit negotiations and provides meeting notes (3rw-401 100200, 100600, 101000, 101300, 102000). Upcoming

Final draft meeting notes prepared by Kate Snider of Floyd & Snider Inc. for the Sea-Tac Airport Third Runway 401 Permit Negotiations held October 20, 2000. Attendees include representatives from Washington State Department of Ecology (Ray Hellwig, Kevin Fitzpatrick, Chung Ki Yee, Erik Stockdale), Port Of Seattle (Michael Cheyne, Elizabeth Leavitt, Keith Smith), King County

STIA Construction Site Stormwater Monitoring reports dated 10/16/2000 and 10/20/2000, samplers JL/RS and JB/RS. AR017259–AR017261. Documents turbidity and pH measurements at multiple construction sites including Logistics Site Development (unnamed catch basin, Tyee Pond, IWS Lagoon 3), MWS Lagoon 3 Construction treatment facility, Airfield Improvement (construction staging area, SDS-7, SDS-6, SDS3-594), Dobbs Flight Kitchen Remodel (SDE4-611,

STIA Construction Site Stormwater Monitoring reports dated 10/16/00 and 10/20/00, samplers JL/RS and JB/RS. Documents turbidity and pH measurements at multiple Sea-Tac Airport construction sites including Logistics Site Development (Tyee Pond, Des Moines Creek outfall), MWS Lagoon 3 Construction, Airfield Improvement (SDS3-594, SDS-6, SDS-7), Dobbs Flight Kitchen Remodel (SDE4-611, SDE4-607, SDE4-615, SDE4-601, SDE4-602), Booster Pump