Notes
Letter dated July 25, 2001 from Keith R. Smith, Water Resources Manager, Port Of Seattle, to Ann E. Kenny, Washington Department of Ecology Northwest Regional Office, clarifying the Low Streamflow Analysis and Summer Low Flow Impact Offset Facility Proposal for Seattle-Tacoma International Airport. Corrections address: embankment recharge calculation using ‘flat outwash grass’; non-contiguous groundwater contributions to Walker Creek (new impervious area corrected to 69 acres from 38, effective impervious area to 59.3 acres from 37.2); Reserve Storage Vaults for Walker Creek Contributing Drainage Area table (SDW2 subbasin, total 11.5 acres); Hydrus/slice modeling of embankment; Summary of Non-Hydrologic Impacts table for Miller Creek (236 septic tanks, 0.082 cfs, withdrawals +0.042, total impact -0.02) and Walker Creek (41 septic tanks, 0.014 cfs, total impact -0.01); spreadsheet files MillerWaterPumpage.xls and SepticRecharge.xls; Walker Creek basin model output files wwcnofill.inp and mnofill.inp. Conference call participants included Port, Ecology, King County, Parametrix, Aquaterra, and Floyd Snider McCarthy. AR 029221.