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The partition coefficient and the receptor/leachate concentration ratio <br /> are combined in order to calculate a soil to groundwater transport factor for <br /> transport from contaminated soils an-site. By estimating transport from the <br /> soil to the leachate to the groundwater to the receptor well, the <br /> concentration at the well is given by: <br /> C = 1/Kd x C/Co x Csoil <br /> where: <br /> C = receptor well concentration <br /> K = leachate partition. factor (14.2 ml/g) <br /> C/Co = receptor/leachate concentration ratio (0.61 percent) <br /> When all of the coefficients are combined, the resulting soil to groundwater <br /> transport factor, S = 4.29x10-4 g/ml. This factor may then be used to <br /> relate allowable concentrations at the groundwater receptor well to allowable <br /> soil levels on site. if the groundwater concentration is given by Cw, then <br /> the corresponding soil concentration Cso,1 on-site is given by: <br /> £soil = Cw/S (mg/kg) . <br /> This relation will be used in the next section to calculate acceptable soil <br /> concentrations on-site based on health effects criteria. <br /> 4.6 Environmental and Heal h Assessment;. - Development of Cleanup Criteria <br /> The potential for off-site receptors to be exposed to unacceptable levels <br /> of chemicals from the site is analyzed in an environmental and health <br /> assessment. This analysis determines acceptable naphthalene concentrations in <br /> on-site soils that avoid unacceptable contaminant levels in groundwater at <br /> receptor locations. <br /> The applicable health and environmental criteria for naphthalene are given <br /> in Table 4-2. Because groundwater in the Stockton area is used for potable <br /> i <br /> . I <br /> 4-9 <br /> I <br /> GGA/0179b <br />