Notes
Exhibit AR033807, WAC 173-340-747 soil concentration calculations for ground water and surface water protection under the Model Toxics Control Act (MTCA), SeaTac Third Runway Embankment Project. Tables derive cleanup levels for hazardous substances including antimony, arsenic, beryllium, cadmium, chromium +3, chromium +6, copper, mercury, nickel, selenium, silver, thallium, zinc, and lead using Equations 747-1 and 720-1. Parameters include Cs (mg/kg), Cw (ug/liter), UCF (mg/ug), DF, Kd (liter/kg), Ow, Oa (mL air/mL soil), Hcc, Pb (kg/liter), GWCL, RfD, ABW, UCF, HQ, AT, DWIR, INH, DWF, and ED. References WAC 173-340-720(4)(b)(A), MTCA Table 747-3, Technical Background Document 9355.4-17A (May 1996), and CLARC II (February 1996). Ground water cleanup levels for both carcinogens and noncarcinogens are derived using CPF values of 1.5 and 4.3 kg-day/mg for arsenic and chromium +6.