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21 October 2020 <br />Project No. 14-3002 <br />Page 12 of 15 <br />samples analyzed. Analytical results of samples are summarized in Table 7. TPH results <br />and the approximate extent of TPH-impacted soil are depicted in Figure 9. The laboratory <br />reports (MAI Work Orders 2006B65, 2006C29, 2006D41, and 2006D64), QA/QC reports, <br />and chain of custody forms are included in Appendix D. Laboratory EDF files were QA/QC <br />checked and uploaded to the State Water Board GeoTracker site. <br /> <br /> <br />5.5. ANALYTICAL RESULTS OF WASTE SAMPLES – LEAD AND DIOXINS <br /> <br />A total of three (3) waste samples collected from B46, B48, and B50 were analyzed for <br />total lead, and four (4) waste samples collected from borings B46, B48, B50 and B65 <br />were analyzed for dioxins/furans as listed in Section 3.3. <br /> <br />The following is a summary of laboratory results: <br /> <br /> Total lead was detected in B46-10, B48-7, and B50-10 at concentrations of <br />23 mg/kg, 160 mg/kg, and 47 mg/kg, respectively. Total lead concentrations were <br />detected below the DTSC-SL and ESL. <br /> Dioxins/Furans were detected in samples B46-10, B48-7, B50-7, and B65-10 at <br />Toxic Equivalency (TEQ) concentrations of 96.6 picograms per gram (pg/g), <br />2.19 pg/g, 64.5 pg/g and 4.47 pg/g, respectively. Dioxins/furans concentrations in <br />B46-10 and B50-7 were detected above the established ESL of 22 pg/g (Table 7). <br /> <br />An explanation for the calculation of the dioxin/furan TEQ is provided in Appendix E. <br /> <br />No additional analytes were reported above laboratory detection limits in the waste <br />samples analyzed. Analytical results of lead and dioxin/furans are summarized in Table 7. <br />The laboratory reports (MAI Work Order 2006B65 and Ceres ID: 13670), QA/QC reports, <br />and chain of custody forms are included in Appendix D. Laboratory EDF files were QA/QC <br />checked and uploaded to the State Water Board GeoTracker site. <br /> <br /> <br />5.6. ANALYTICAL RESULTS OF GROUNDWATER SAMPLES <br /> <br />A total of five (5) grab groundwater samples were collected by AGI from borings B46, <br />B48, B65, B67 and B79. Groundwater samples were collected beneath encountered <br />waste in borings B46, B48, and B65 and analyzed for TPH, lead and dioxin/furans. <br />Additionally, groundwater samples collected from borings B67 and B79 were analyzed <br />for TPH. Duplicate groundwater samples were collected by Regional Board staff from <br />borings B65, B67, and B78/79 and analyzed for PFOA and PFOS; the sample collected <br />from B78/79 was also analyzed for TPH-g. <br /> <br />The following is a summary of laboratory results: <br /> <br /> TPH-g were not detected above laboratory reporting limits in the groundwater