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�I <br /> Treadwell8RO110 <br /> elevation, and temporary one-inch diameter slotted PVC casing was placed into the boring <br /> Groundwater grab samples were collected using a dedicated disposable polyethylene bailer <br /> Immediately after collection, all samples were labeled, and placed in an iced cooler All <br /> groundwater samples and selected soil samples were submitted to STL Chromalab, a California <br /> state certified laboratory for analysis using chain of custody protocols <br /> All soil, groundwater and decontamination water generated during this scope of work were <br /> stored on site in drums pending analytical results All borings were closed by pressure grouting <br /> in accordance with San Joaquin County requirements <br /> 4.2 Laboratory Analytical Program <br /> Soil and groundwater samples were analyzed for <br /> • TPHg by EPA method 8015M, <br /> • Benzene, toluene, ethylbenzene, total xylenes (BTEX) and MTBE by EPA Method 8021 <br /> for soil, and <br /> • VOCs (including BTEX and MTBE) by EPA Method 8260B for water <br /> 4.3 Investigation Results <br /> Tables 1 and 2 summarize the analytical results for soil and groundwater respectively <br /> 43 1 Soil Results <br /> The highest concentrations of TPHg were encountered in the soil at the three borings located <br /> closest to the former UST location (1613-6b, 16B-7b and 1613-8) Soil samples collected between <br /> 16 5 and 18 5 feet bgs in these borings contained TPHg concentrations ranging from 15,000 to <br /> 20,000 milligrams per kilograms Shallower soil contamination in these borings did not exceed <br /> 150 mg/kg except in boring 16B-8 at 11 and 12 5 feet bgs, which had concentrations of TPHg of <br /> 5 <br /> 25971014 DGD 7 April 2004 <br />