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GeoStrategies Inc. � �1j, <br /> Chevron USA, Inc. <br /> February 6, 1992 <br /> Page 3 <br /> ANALYTICAL RESULTS <br /> Excavation Results <br /> TPH-Gasoline, TPH-Diesel and BTEX were not detected (ND) in sample CW-1. <br /> TPH-Oil and O&G were reported as 110 parts per million (ppm) and 280 ppm, <br /> respectively. Chemical analytical data and the sample collection depth are <br /> presented in Table 1. <br /> Stockpile Results <br /> TPH-Gasoline, TPH-Diesel and BTEX were reported for sample CWS-1 as ND. <br /> TPH-Oil concentration was reported as 160 ppm and O&G concentration was <br /> reported as 180 ppm. Total lead concentration was reported as 100 ppm. <br /> Chemical analytical data are summarized in Table 1. <br /> OVEREXCAVATION ACTIVITIES <br /> Upon receipt and evaluation of the chemical analytical data, the excavation was <br /> deepened to approximately 13 feet below grade, and two additional sidewall soil <br /> samples were collected. Samples CX-2S and CX-3S were collected at depths of <br /> approximately 11.5 feet below grade on the southern and northern sidewalls of <br /> the excavation, respectively (Plate 3). A representative of the SJCPHS witnessed <br /> the overexcavation and soil sampling. <br /> Approximately 15 cubic yards of soil from the overexcavation was stockpiled on <br /> the north side of the excavation (Plate 3), and sample CWS-2 was collected <br /> from the stockpile using procedures described above. <br /> Samples CX-2S, CX-3S and CWS-2 were analyzed for TPH-Gasoline, TPH- <br /> Diesel, TPH-Oil, BTEX and O&G. Sample CWS-2 was analyzed for TPH- <br /> Diesel, TPH-Oil, BTEX and O&G. In addition, sample CX-3S was analyzed for <br /> soluble lead. Sample CWS-2 underwent a Bioassay Toxicity Test required for <br /> soil disposal at a State-certified landfill. <br /> Ground-water Sample <br /> Groundwater was encountered approximately 12 feet below grade. Water sample <br /> CH-1 was collected after soil sampling was completed. The sample was <br /> analyzed for TPH-Gasoline, TPH-Diesel, TPH-Oil, BTEX, O&G, CL HC, PCBs <br /> and ICAP Metals. <br /> 729702-2 <br />