Notes
Letter dated May 24, 2000 from Azous Environmental Sciences (professional wetland scientist, SWS certification 001067) to Ms. Gail Terzi and Mr. Jonathan Freedman, US Army Corps of Engineers, Regulatory Section, Seattle District, submitted on behalf of the Airport Communities Coalition (ACC). Reviews wetland impacts to Wetland 43 from construction of the SR509 temporary interchange associated with the third runway at Seattle-Tacoma International Airport in Burien, WA. Concludes that sediment-laden stormwater discharges to Wetland 43 will occur due to steep slopes (30-foot drop over 60 feet), proximity of construction zone (as little as 40 feet from wetland boundary), and inadequate temporary erosion controls including wattles and silt fence. Identifies inconsistent wetland boundary delineations between HNTB Corporation plans (February 24, 2000), HNTB hydraulic report (April 12, 2000), and Parametrix, Inc. memorandum (May 3, 2000). Notes stormwater facility improperly sited within Wetland 43; references Walker Creek, Miller Creek, Wetland 44, Category 2 wetland classification, and 1961 aerial photo evidence. Cites scientific buffer distance studies (minimum 33 feet to maximum 197 feet) relevant to sediment discharge protection.