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i► <br /> 1 <br /> to be installed closer to the site. Land between the site and the City of <br /> Stockton well is occupied by a cemetery, and the CalWater Service well is <br /> located immediately north of the site boundary. Furthermore, any new <br /> construction around the site will be served by a public water system, so that <br /> new well installations are unlikely near the site. <br /> 4.5 Trans or nd Fate Anal i <br /> Transport and fate analysis is used to estimate the concentrations of <br /> exposure at receptor locations using information about the site and the <br /> distribution of the chemicals present. When several chemicals are of <br /> interest, one may be chosen on the basis of increased mobility in the <br /> significant pathways for more detailed modeling. In this case, the single <br /> significant pathway of exposure to be considered is leaching of contaminants <br /> to the groundwater which would then be transported to the receptor well. As <br /> stated before, the nearest downgradient well is screened at a depth much lower <br /> than the groundwater table, but this transport pathway was modeled using <br /> ovide' a health and environmentally conservative <br /> conservative assumptions to pr <br /> assessment. <br /> 4.5.1 Leaching to Groundwater <br /> Transport to groundwater is modeled using equilibrium partitioning between <br /> soil and water infiltrating the site. The equilibrium nater concentration is <br /> given by: <br /> C = Cs / Kd (CDOES, 1986) <br /> leachate <br /> Where C = concentration in infiltration water (mg/1) <br /> leachate <br /> C =concentration in'sOil (mg/kg) <br /> s <br /> Kd = partition coefficient (ml/g) <br /> 4-6 <br /> GGA/0179b <br />