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Ms. Kathleen Minahan - 6 - 31 January 2007 <br /> Table 1. Soil Screening Levels And Groundwater Cleanup Levels For Compounds <br /> Identified at Lesco, Inc., Port of Stockton <br /> Soil Screening Reference for Screening Water Quality Basis for <br /> Compound Level Level Objective' Objective <br /> Nitrate-N 100 mg/kg (sum m /I 10 California Primary <br /> of Nitrate-N plus Generic groundwater g MCL <br /> protection via leaching <br /> Ammonium Ammonium-N) 1.5 mg/I Odor Threshold <br /> Generic groundwater Range of <br /> Sulfate 2,500 mg/kg protection via leaching 250-500 mg/I Secondary MCLs <br /> Public Health <br /> Lead 1,500 mg/kg CHHSL, residential 2 ug/I Goal <br /> Public Health <br /> Nickel 16,000 mg/kg CHHSL, residential 12 ug/I Goal <br /> Zinc 23,000 mg/kg CHSSL, residential 2,000 ug/I Agricultural Water <br /> Quality Limit <br /> Cal/EPA Cancer <br /> DDT 1.6 mg/kg CHSSL, residential 0.1 ug/I Potency Factor <br /> d-Benzene USEPA PRG 2004, 0.0088 ug/l Cal/EPA Cancer <br /> 0.3 mg/kg residential Potency Factor <br /> Hexachloride Y <br /> Cal/EPA <br /> Dieldrin 0.035 mg/kg CHSSL, residential 0.0022 ug/I Potency Cancer <br /> Potency Factor <br /> Dicamba 18,000 mg/kg USEPA PRG 2004 210 ug/l US EPA IRIS <br /> Reference Dose <br /> 2,4-D 6,900 mg/kg CHSSL, residential 70 ug/I California Primary <br /> MCL <br /> Total Petroleum <br /> Hydrocarbons as 100 mg/kg Generic groundwater Taste and Odor <br /> 100 ugll <br /> protection via leaching Threshold <br /> Diesel <br /> ' A Compilation of Water Quality Goals, Regional Water Quality Control Board, Central <br /> Valley Region, August 2003 <br /> Abbreviations. <br /> 2,4-D 2,4-dichlorophenoxyacetic acid <br /> CHSSL California Human Health Screening Levels <br /> IRIS Integrated Risk Information System <br /> MCL Maximum Contaminant Level for Drinking Water <br /> PRG US EPA Preliminary Remediation Goals <br />