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• One spiked sample for every ten samples, batch of samples or type of matrix, whichever is more <br /> frequent,with the spike made at ten times the detection limit or at the analyte level. <br /> ATL was instructed to homogenize the soil samples in accordance with contract specifications prior to <br /> analysis for metals. <br /> INVESTIGATION RESULTS <br /> The following sections present Summaries of the field sampling and laboratory testing activities. <br /> Soil Conditions <br /> At each boring location native alluvial soil was encountered beneath the asphalt pavement. The alluvium <br /> was generally comprised of clayey silt to silty clay to depths between 13 and 14 feet underlain by silty <br /> fine sand.Field indicators of apparent contamination(i.e.staining,odors,elevated PID readings)were not <br /> observed during the field sampling activities. Copies of boring logs presenting soil descriptions, sample <br /> depths and PID readings are attached. <br /> Analytical Results <br /> GRO, VOCs, SVOCs and PCBs were not detected above the laboratory reporting limits in each soil <br /> sample analyzed. DRO and ORO were detected in each soil sample at relatively low concentrations <br /> ranging from 3.6 to 5.6 milligrams per kilogram. <br /> Metals including arsenic, barium, chromium, cobalt, copper, lead, nickel, vanadium and zinc were <br /> reported in each soil sample at concentrations within the range of naturally occurring background levels. <br /> Summaries of the soil analytical data are presented in Tables 2 and 3. Copies of the laboratory report and <br /> COC documentation are attached. <br /> CONCLUSIONS AND RECOMMENDATIONS <br /> Based on field observations and lack of significant contaminant concentrations in the soil samples <br /> obtained from borings BI and B2, no evidence of UST-related petroleum hydrocarbon releases were <br /> identified. <br /> We recommend that Caltrans properly abandon the tank in-place in accordance with SJCEHD permit <br /> requirements. Comcast should further be notified that tank abandonment will include the portion of their <br /> fiber optic line that penetrated the tank. <br /> Linden UST Site Investigation,TO No.4 Caltrans Contract 06A 1895,EA No. 10-OY3600 <br /> Geocon Project No.S9800-01-04 -4- December 11,2013 <br />