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21 October 2020 <br />Project No. 14-3002 <br />Page 8 of 15 <br />Additionally, waste was encountered in several borings without a distinct waste cell area. <br /> <br /> Mixed soil and waste were encountered in borings B44 and B56 between 3.0 and <br />4.5 feet bsg and in B56 from 9.0 to 10 feet bsg. Glass processing waste was <br />encountered in B65 between 8.5 and 13 feet bsg. These areas are depicted in <br />Figures 2 and 4. <br /> <br />Waste Cell No. 1A is discontinuous from the South Waste Cell. Waste was not <br />encountered in borings B69, B70 and B71, advanced approximately 1.5 feet from the <br />eastern property boundary and within the benched/sloped area of the stormwater <br />retention basin at 17100 Murphy Parkway. Groundwater was encountered in borings B69, <br />B70 and B71 between 7.5 and 8.0 feet bsg. Following advancement of the borings, AGI <br />used a Solinst water level meter to measure the depth to groundwater in well MW-4, <br />located approximately 65 feet west of boring B69. The depth to groundwater in MW-4 was <br />measured at 11.05 feet bsg, indicating the surface elevation of borings B69, B70, and <br />B71 was 3.0 to 3.5 feet bsg (Figure 3). Boring logs describing the wastes encountered <br />are included in Appendix C. <br /> <br />Based on the location and depth of the stormwater basin relative to the property boundary <br />and the investigation performed, it’s unlikely that any additional waste remains west of <br />the property boundary from the South Waste Cell formerly located at 17100 Murphy <br />Parkway. <br /> <br /> <br />5.3. ANALYTICAL RESULTS OF SOIL AND WASTE SAMPLES - PCBs <br /> <br />A total of one hundred fourteen (114) soil samples and eleven (11) waste samples (waste <br />and mixed waste/soil) collected from borings (B30, B31, B35, B44 through B68, B78 and <br />B79), surface samples (SS-1 through SS-11), and concrete samples (Concrete-1 and -2) <br />were analyzed for dry-weight PCBs as listed in Section 3.3. Aroclor 1254 was the only <br />congener detected above laboratory reporting limits in the PCB analysis. A summary of <br />the analytical results of all PCB congeners is provided in Table 1. <br /> <br /> <br />5.3.1. Surface Samples <br /> <br />A total of forty-two (42) surface samples were analyzed. Surface samples were collected <br />and analyzed from borings B30, B31, B35, B44 through B68, B78, and B79; SS-1 through <br />SS-11; and Concrete-1 and -2. The following is a summary of laboratory results: <br /> <br /> PCBs were detected in a total of fifteen (15) surface samples at concentrations <br />ranging from 0.076 mg/kg in SS-6 to 0.70 mg/kg in B53. <br /> PCBs were detected above the DTSC-SL in the sample collected from B53. <br />Although, the concentration was below the ESL.