Notes
Exhibit 410 (AR 021884–021886), prepared by Pacific Groundwater Group, Ecology and Environment, and Earth Tech Inc. for the Washington State Department of Ecology Northwest Regional Office, dated June 19, 2000. Report examines hydrologic impacts of the Sea-Tac Airport third runway embankment fill on Miller Creek, Walker Creek, wetlands, fish habitat, groundwater recharge, and stormwater management. Topics include fill chemistry effects, shallow groundwater circulation, HSPF surface-water model calibration, flow control design, wetland mitigation review, borrow area impacts, hydrogeologic characterization of geologic units (Qvr, Qvt, Qva, Qtb), soil water balance, and construction-period stormwater controls. Prepared under project number JE9907.