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24 May 2021 <br />Project No. 14-3002 <br />Page 16 of 23 <br /> <br />12 feet bsg in B31. Glass waste may have fallen out of the sample sleeve during <br />sampling of this boring. <br /> Additionally, mixed soil and waste was encountered in borings B44 and B56 <br />between 3.0 and 4.5 feet bsg and between 9.0 and 10 feet bsg, respectively. These <br />areas are depicted in Figures 10 through 16. <br /> <br /> <br />5.5. AOC2 – SUMMARY OF RESULTS AND EXTENTS <br /> <br />The following is a summary of the analytical results and extents of COC contamination in <br />soil and groundwater in AOC2. <br /> <br /> <br />5.5.1. PCB Results and Extents <br /> <br />A total of 138 soil and waste samples (15 waste samples); two concrete samples, and <br />three groundwater samples were analyzed for PCBs within AOC2 and just outside of <br />AOC2, along the perimeter of the Facility (surface samples and B78 and B79). PCB <br />Aroclor 1254 was the only Aroclor detected in AOC2 and at the Site. The samples were <br />collected from borings B30 through B36, B38, B40 and B43 through B68; surface sample <br />locations SS-1 through SS-11; and concrete from the former gas turbine package and <br />heat recovery steam generator (HRSG) in the Facility. <br /> <br />Soil and waste samples were analyzed from various depths between surface grade and <br />15 feet bsg, which mostly included surface grade, three feet, five feet, seven feet and ten <br />feet bsg. <br /> <br />PCBs were detected in 15 surface samples below the RSL and in the following samples <br />above the RSL of 0.97 mg/kg: <br /> <br /> Nine soil and waste samples collected from three feet bsg at concentrations <br />ranging from 1.2 mg/kg in B51 and B61 to 48 mg/kg in B44-3-soil/waste <br />(Table 1B). <br /> Nine soil and waste samples collected from five feet bsg at concentrations ranging <br />from 1.1 mg/kg in B50-5-waste to 100 mg/kg in B47-5 (Table 1C). <br /> Four soil and waste samples collected from seven feet bsg at concentrations <br />ranging from 1.1 mg/kg in B48-7-waste to 320 mg/kg in B46-7 (Table 1D). <br /> Two waste samples collected from ten feet bsg at concentrations of 1.1 mg/kg in <br />B50-10-waste and 3.0 mg/kg in B68-10-waste (Table 1E). <br /> <br />Analytical results of PCBs in soil and waste are summarized in Tables 1 through 1E, <br />depicted in plan view in Figures 10 through 15 and in cross-sectional view in <br />Figures 17 through 21.