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13 November 2018 AGE Project No. 18-4357 Page 8 of 11 AdvancedGeo Environmental 58.9 mg/kg in SW -E and 4,220 mg/kg in S6-2. Additionally, TPH-mo was reported in B-5, below the detection limit, at a concentration of 43.0 mg/kg; in the lab report the detection is listed as: trace concentration between the method detection limit and practical quantitation limit. • TPH-g, TPH-d, and TPH-mo were not detected above laboratory reporting limits in the soil samples collected at 5 feet bsg from S7, S8, S9, and S11. • Chromium was detected by TTLC analysis in the soil samples analyzed at concentrations ranging between 54.1 mg/kg and 89 mg/kg. • Based on the chromium TTLC results, 17 soil samples were analyzed by STLC analysis for chromium. Chromium was detected by STLC analysis in the soil samples analyzed at concentrations ranging between 0.063 mg/I and 1.20 mg/I. All the results were below the California Hazardous Waste Limit of 5.0 mg/I for chromium. • Lead was detected by TTLC analysis in the soil samples analyzed at concentrations ranging between 4.03 mg/kg and 189 mg/kg. • Based on the lead TTLC results, 3 soil samples were analyzed by STLC analysis for lead. Lead was detected by STLC analysis in the soil samples analyzed at concentrations of 7.25 mg/I (S5-2), 2.20 mg/I (SP -1) and 2.83 mg/I (SP4). The STLC concentration detected in sample S5-2 was above the California Hazardous Waste Limit of 5.0 mg/I for lead; the other two samples were below the 5.0 mg/I limit. • Various additional CAM 17 metals were detected in the soil samples. However, all detections were within normal background levels for metals in California soils (Background Concentrations of Metals, a Progress Report, DTSC Geological Services Unit, Glendale and Background Concentrations of Trace and Major Elements in California Soils: Kearney Foundation of Soil Science Division of Agriculture and Natural Resources University of California, March 1996). • TPH-g, PCBs, VOCs, and SVOCs were not detected above laboratory reporting limits in the samples analyzed for the constituents. Analytical results of all soil samples are summarized in Table 1. Additionally, each analytes respective ESL, DTSC-SL, RSL, and California Hazardous Waste Limit is listed in Table 1. The laboratory reports (Enviro Chem, Inc. Lab I.D.: 180815, 180906, and 181102), quality assurance/quality control report and chain of custody form are included in Appendix C. 6.0. CONCLUSIONS Based upon the investigation performed at the site in August 2018, AGE provides the following conclusions: