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<br />Remediation Goals are used to screen pollutants in <br />environmental media, to trigger further investigation and <br />to provide initial clean up goals. Different Preliminary <br />Remediation Goals are established for residential and <br />industrial properties, with stricter standards being <br />applied for residential uses. <br /> <br />Varying levels of pesticides were detected in the soil <br />samples collected on the project site. However, based on <br />the US EPA criteria, none of the samples with detected <br />levels of pesticides exceeded the Preliminary Remediation <br />Goal for industrial or residential uses. <br /> <br />The State of California Department of Toxic and Substance <br />Control (DTSC) also have threshold levels for various <br />pollutants in soil. The total threshold limit concentration <br />and soluble threshold limit concentration are used to <br />determine whether excavated soil would be classified as a <br />hazardous or nonhazardous waste for disposal purposes. The <br />detected concentrations of pesticides in the soil samples <br />collected on the project site were analyzed for pesticides <br />and compared to the total threshold limit concentration <br />thresholds established by the DTSC. None of the detected <br />concentrations of pesticides exceeded their respective <br />total threshold limit concentration nor were high enough to <br />require further analysis. <br /> <br />Metals <br /> <br />Varying concentrations of metals were detected in the soil <br />samples collected and analyzed for metals. Both arsenic and <br />lead were identified to have elevated levels in the soil <br />samples collected. The Preliminary Remediation Goals for <br />residential and industrial settings for arsenic are 0.062 <br />and 0.25 mgjkg. Background concentrations of arsenic found <br />in the Eastern United States soils (non-contaminated sites) <br />range from 0.10 to 97 mgjkg. The USEPA do not require <br />cleanup below natural background levels. All of the <br />analyzed soil samples detected arsenic concentrations above <br />the Preliminary Remediation Goals for residential and <br />industrial settings and all of the detected concentrations <br />are within the range of naturally occurring background and <br />concentrations for arsenic. <br /> <br />Additionally, the levels of metals detected were compared <br />to total threshold limit concentration levels established <br />by the DTSC. The total threshold limit concentration was <br /> <br />16 <br /> <br />31A731 <br />