EXH0661024759

PCHBPollution Control Hearings Board of the State of Washington

ST00 Kitsa# Way _ 1231 F_ar Avenue l'-T7820 N.E. Hoirnan Suite202 , P.O.Box 460 Suite@_ _remenon. "NA 98312-_-°34 Sumner. WA 98390-;516 PorIlancl. OR 97218-2859 360-3TT-OQ14• i-:ax: 36Q-479-5961 253-a63-5128 • Fax: 253-863-Q9,t.6 503-256-5,.i-_ - 360-694.-5020 E-mail: pmxi_rern@l_ararnetrix.corn E-mail: pmxsurnner@!_aramemxcorn Fax: 503-2564221 _58C18 LaKeWashington. Siva. ,_E.- Texas Suite200 _ 10540RocxleyRoac KirKlan(_.WA 98033-T350 Suite 300 425-822-8880 - Pax: 4-25--389-8808 Houston. ,'D/,'T099-3531 E-mail: _mx@_ararnemx.corn 2.81-530-1920 • Fax: 2B1-530-674,4 We are transmitting the following materials: _),e._._'-- _?__,P .4_""__ Comments: / These are: C Per your Flecluest Sent via- .__¢'u.S. Mail ,_r- For your Information _ Couner _or your Fteview and Approval [] Exl_ress Overnight For your Files f'-i Other - Interoffice [] For your Action Sincerely, _ L/ AR 024759 Seattle-Tacoma International Airport WQ BMP Assessment June 11, 1999 1. PURPOSE AND SCOPE This document is prepared in support of the Water Quality Certification for the Seattle- Tacoma International Airport (STIA) Master Plan Upgrades. It describes the status of existing stonnwater runoff treatment best management practices 0BMPs) and proposed BlVIPupgrades to comply with redevelopment requirements. This document does not discuss BlVlYs for future Third Runway SDS subbasins, since these will be designed in compliance with the Department of Ecology Stonnwater Management Manual for the Puget Sound (the Ecology Manual). Hydrologic (flow) controls will not be discussed. The Port of Seattle (the Port) has demonstrated in other analyses that hydrologic controls for existing and future development will comply with Ecology Manual requirements. 2. REGULATORY REQUIREMENTS Ecology has stated that the Master Plan Upgrades are considered "redevelopment."…
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