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24 May 2021 <br />Project No. 14-3002 <br />Page 15 of 23 <br /> <br />5.3.4. Lateral and Vertical Extent of COC Contamination <br /> <br />The data indicates that the glass processing waste is the source of the PCB, dioxin, and <br />total lead contamination. The maximum concentrations of COCs were detected in the <br />waste samples, and very low to non-detect levels were detected in the step-out borings <br />advanced to define the waste cells. PCBs and lead exceeded their respective RSLs in <br />only one waste sample collected from AOC1, and the PCB concentration of 1.0 mg/kg <br />was just slightly above the RSL of 0.97 mg/kg. <br /> <br />Only limited sampling was performed in the area of Waste Cell No. 1A because the main <br />objective was to define the waste cell in that location. However, the limited data collected <br />from this area is consistent with the data collected from Waste Cell No. 1. Even with <br />limited data points, AGI concludes that the lateral and vertical extent of COC <br />contamination in AOC1 is defined, and the contamination is limited to the locations of <br />Waste Cell No. 1 and 1A. Additionally, confirmation sampling performed at the adjacent <br />property (17100 Murphy Parkway) following the removal of the NWC and SWC further <br />confirms this conclusion (Appendix H). <br /> <br />COC concentrations are summarized Tables 1 through 6 and illustrating in Figures 4 <br />through 9. <br /> <br /> <br />5.4. AOC2 - WASTE CELL DELINEATION <br /> <br />Soil borings B31 through B68 were advanced within the Facility area. The borings located <br />Waste Cell No. 2, Waste Cell No. 2A, and isolated areas that contained buried glass <br />waste mixed with soil but not within a distinct waste cell. The waste identified in AOC2 <br />was consistent with the glass processing waste encountered in AOC1. The waste <br />consisted of dry, small pieces of clear, bluish, and red glass mixed with white-, red- and <br />black-colored crumbly and powdery solid residue. Limited pieces of waste exhibited a <br />bright orange color, and a faint burnt odor was observed in the glass waste encountered <br />in borings B35, B40, and B47. <br /> <br /> Waste Cell No. 2 is located beneath the central-eastern area of the Facility. The <br />waste cell comprises an aerial extent of approximately 5,100 square feet and was <br />encountered between approximately 5.0 feet and 14.5 feet bsg. The limits of the <br />waste cell appear to be defined by step-out borings B36, B39, B41, B42, B43, B64, <br />B66 and B79 (Figures 10 through 17, and 21). <br /> Waste Cell No. 2A is located beneath the southwestern area of the Facility. The <br />waste cell comprises an aerial extent of approximately 10,000 square feet and was <br />encountered between 4.0 feet and 12.5 feet bsg. The limits of the waste cell appear <br />to be defined to the north, northeast and east by borings B30, B31, B49, B52 and <br />B67. The waste cell limits are undefined to the south and west of the Facility <br />(Figures 10 through 16, 18 and 19). Borings B30, B49 and B52 were only <br />advanced to five and ten feet bsg. Also, no recovery was logged between 10 and