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24 May 2021 <br />Project No. 14-3002 <br />Page 9 of 23 <br /> <br />AOC2 <br /> <br />Soil and waste are impacted with PCBs, dioxins, TPH and Pb at maximum concentrations <br />of 320 mg/kg, 96.6 pg/g, 7,500 mg/kg (TPH-mo) and 160 mg/kg, respectively. The <br />maximum concentrations of dioxins and Pb were detected in waste samples and the <br />maximum concentrations of PCBs and TPH were detected in soil samples either directly <br />above or beneath waste. The maximum concentrations of PCBs, dioxins, and TPH were <br />above their respective RSLs and ESLs. <br /> <br />Groundwater is impacted with dioxins, TPH-diesel (TPH-d), TPH-motor oil (TPH-mo) and <br />total Pb at maximum concentrations of 2.41 pg/l, 1,000 µg/l, 6,100 µg/l and 0.37 mg/l, <br />respectively. The maximum concentrations were detected from borings where waste was <br />encountered. The maximum concentrations exceeded the MCL priority for TPH-d and the <br />MCL for Pb. However, total Pb concentrations need to be confirmed for the dissolved <br />concentration. Dioxins were detected significantly below the MCL of 30 pg/l and PCBs <br />were not detected above the laboratory reporting limit of 0.5 µg/l. <br /> <br /> <br />2.8.2. Figures and Tables <br /> <br />Analytical results of COCs in soil and waste are summarized in Tables 1 and 2 and results <br />of COCs in groundwater are summarized in Tables 3 and 4. Analytical results of Title 22 <br />metals, SVOCs, PAHs, VOCs, nitrates, total ammonia, and total dissolved solids are <br />provided in Tables 5 through 10. Groundwater elevation data is summarized in Table 11. <br /> <br /> <br />AOC1 <br /> <br />PCBs and dioxins in soil and waste are depicted in Figures 4 and 5, respectively, and in <br />cross-sectional view in Figures 6 through 9. <br /> <br /> <br />AOC2 <br /> <br />PCBs results in soil and waste from surface grade to 10 feet bsg and the estimated extent <br />of PCBs above the RSL are depicted in Figures 10 through 14; dioxin results in soil and <br />waste are depicted in Figure 15; and TPH-d results in soil and waste and the estimated <br />extent are depicted in Figure 16. Cross-sectional views illustrating lithology and the <br />estimated extent of PCBs and TPH-d are presented in Figures 17 through 21; TPH-d and <br />Pb results in groundwater are presented in Figure 22; and a groundwater elevation map <br />illustrating groundwater flow direction and gradient from monitoring performed on 06 April <br />2021 is presented in Figure 23. Additionally, a map depicting proposed boring locations <br />to further characterize the Site is presented in Figure 24. <br /> <br />