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24 May 2021 <br />Project No. 14-3002 <br />Page 14 of 23 <br /> <br />PCBs were detected in one soil sample at a concentration of 0.082 mg/kg (B15-3) and in <br />five waste samples at concentrations ranging from 0.180 mg/kg (B18-SL Waste) to <br />1.0 mg/kg (20-SL Waste). The maximum concentration was detected in the duplicate <br />waste sample collected from B20-5. Although, PCBs were detected in B20-5 at a <br />concentration of 0.680 mg/kg. The PCB concentration detected in the duplicate waste <br />sample was the only concentration detected above the RSL of 0.97 mg/kg. Analytical <br />results of PCBs are summarized in Tables 1, 1B, and 1C and Figure 4, and depicted in <br />cross-sectional view in Figures 6 and 7. <br /> <br />PCBs were not detected above the laboratory reporting limit of 0.5 µg/l in the groundwater <br />samples collected from AOC1 (Table 4). <br /> <br /> <br />5.3.2. Dioxins and Lead Results <br /> <br />A total of 13 soil and waste samples and two groundwater samples were analyzed for <br />dioxins in AOC1. Dioxins were detected in three soil samples at Toxic Equivalency (TEQ) <br />concentrations ranging from 0.00984 pg/g (B18-10) to 0.0304 pg/g (B20-15) and in eight <br />waste samples at TEQ concentrations ranging from 1.12 pg/g (B18-5 Waste) to 17.6 pg/g <br />(B18-9 Waste). All dioxin concentrations were detected below the RSL of 22 pg/g. <br />Analytical results of dioxins are summarized in Table 2 and Figure 5 and depicted in <br />cross-sectional view in Figures 6 and 7. An explanation for the calculation of the dioxin <br />TEQ is provided in Appendix G. <br /> <br />Dioxins were not detected above the laboratory reporting limit in the groundwater samples <br />collected from AOC1 (Table 3). <br /> <br />A total of 16 soil and waste samples and three groundwater samples were analyzed for <br />total lead in AOC1. Lead was detected in nine soil samples at concentrations ranging <br />from 1.2 mg/kg (B9-5) to 15.8 mg/kg (B2-15) and in seven waste samples at <br />concentrations ranging from 13.5 mg/kg (B19-5 Waste) to 6,400 mg/kg (B18-SL Waste). <br />The next highest concentration was 69.5 mg/kg detected in B20-5 Waste. Except for total <br />lead in B18-SL Waste, concentrations were detected below the RSL of 800 pg/g. <br />Analytical results of lead are summarized in Table 2. <br /> <br />Lead was not detected above the laboratory reporting limit in the groundwater samples <br />collected from AOC1 (Table 3). Additionally, STLC analysis was performed for samples <br />B16-5 Waste, B18-5 Waste, and B20-5 Waste and lead was detected between 0.52 mg/l <br />and 1.32 mg/l, below the California Hazardous Waste Limit of 5.0 mg/l (Table 6). <br /> <br /> <br />5.3.3. TPH Results <br /> <br />A total of 12 soil and waste samples and two groundwater samples were analyzed for <br />TPH in AOC1. Soil, waste, and groundwater samples were not detected above laboratory <br />reporting limits in the samples analyzed (Tables 2 and 3 and Figures 6 and 7).