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i <br /> _. <br /> As an alternative to preparing a detailed,baseline environmental risk assessment, soil, groundwater <br /> and other data collected at a site can be directly compared to the ESLs and the need for additional <br /> actions determined in an expedited risk assessment. This approach has been shown to be especially <br /> effective and efficient at sites with limited or relatively straightforward types of contamination,where <br /> the preparation of a more formal risk assessment may not be warranted or feasible due to time and cost <br /> constraints. <br /> 4.5.2 Site ESL Criteria <br /> The below table is a summary table from the RWQCB(2005) ESL publication that presents shallow <br /> soil screening levels(<3 meters)for and commercial land use. This table was designed by RWQCB <br /> staff to present guidelines for potential regulatory agency site closure decisions. The table is designed <br /> to be used provided that sufficient data is available regarding contaminant source and concentrations <br /> in soil, depth to groundwater at the site, groundwater concentrations of remaining petroleum <br /> i hydrocarbons; direct exposure of humans and urban area ecotoxicity criteria. <br /> Regulatory Threshold Concentrations in Soils For Protection of Human Health <br /> Concentrations in mg/kg <br /> Chemical Sit. USEPA USE PA, Typical Central TTLC for TLC for <br /> 6a.kground Valley hazardous waste hazardous wast. <br /> RWQCB <br /> Coneentraiions` Residensial Industrial <br /> PRC PRG San Joaquin <br /> County <br /> Total Hydrocarbons I TPHd(I IU mg/kg) NA NA -U IUD(1) NA NA <br /> (diesel) <br />' 1. Threshold concentration based on protection of goundwater <br /> E <br /> Environmental\STETARSCRO 9102008.wpd 28 <br />