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Quik Stop Market No. 120 October 9, 1994 <br /> Project No. 349120-31 Page 4 <br /> - in Redwood City, California analyzed the sample using methods approved by the <br /> RWQCB and the Environmental Protection Agency (EPA). <br /> Both soil and groundwater samples were analyzed for: total petroleum hydrocarbons as <br /> gasoline (TPHG) with characterization for benzene, toluene, ethyl benzene, and total <br /> xylenes (BTEX); total petroleum hydrocarbons as diesel (TPHD); and total lead. In <br /> - addition, some of the soil samples were analyzed for soluble lead. Copies of soil and <br /> groundwater analytical reports and chain of custody records are included in Appendix <br /> B. <br /> SUMMARY OF ANALYTICAL RESULTS <br /> The following is a brief description of the soil and groundwater analytical data. For a <br /> summary of soil and groundwater results, refer to Tables I and 2. <br /> Soil <br /> TPHG was detected in soil samples from MW-1 and MW-3 at maximum concentrations <br /> of 6.0 milligrams per kilogram (mg/kg) at an apptoximate depth of 30 feet and 8.7 <br /> mg/kg at an approximate depth of 20 feet, respectively. Various concentrations of <br /> BTEX were detected in soil samples from all three borings to depths ranging from 5 to <br /> 45 feet. <br /> TPHD was detected in soil samples from MW-1, MW-2, and MW-3 at maximum <br /> concentrations of 7.0 mg/kg at a depth of 30 feet, 7.2 mg/kg at a depth of 25 feet, and <br /> 6.3 mg/kg at a depth of 25 feet, respectively. Laboratory analyses revealed total lead in <br /> - all soil samples. <br /> Groundwater <br /> Laboratory analyses did not detect any TPHG or BTEX in groundwater samples from <br /> MW-1, MW-2, or MW-3. TPHD was detected in the sample from MW-3 at a <br /> concentration of 120 micrograms per liter (µg/1). Total lead was detected in <br /> groundwater samples from all three wells. <br /> DISCUSSION AND RECOMMENDATIONS <br /> Soil analytical results for lead were compared to the Total Threshold Limited <br /> Concentration (TTLC, I,000 mg/kg) and Soluble Threshold Limit Concenntion <br /> (STLC, 5.0 milligrams per liter [mgA]) as defined by the Department of Health Services <br /> (DHS) in Title 22 of the California Administrative Code. If the analyses results <br /> exceeded the STLC but were below the TTLC, a Waste Extraction Test (WET) was <br /> �- performed. A total of four soil samples from MW-2 and MW-3 were analyzed using <br /> the WET. All of the soil results from the WET were below the STLC for Lead. <br />