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1 <br /> benzene, toluene, and total xylenes, less than 0 15 parts per million (ppm) were <br /> detected in soil at depths from 9 5 to 50 feet bgs at this location TPHd was also <br /> previously detected at 2 4 ppm at this location. <br /> o Soil boring CB-3 was located adjacent to boring B-14 (VEW-1) and completed to a <br /> depth of 46 5 feet bgs In order to determine the radius of influence of the VES and <br /> ' extent of hydrocarbons, if any, east of the former UST Previously, low levels of <br /> benzene, toluene, and total xylenes, less than 0 014 ppm, were detected in soil at <br /> ' depths from 10 5 to 41 feet bgs at this location <br /> o Soil boring CB-1 was located in the vicinity of borings B-12 (MW-5) and B-18 and <br /> 1 completed to a depth of 75 feet bgs in order to determine the extent of hydrocarbons, if <br /> any, south of the UST Previous concentrations of BTEX in either of these locations <br /> were less than 0 033 ppm at depths from 40 to 70 feet bgs <br /> o Soil boring CB-4 was located adjacent to boring B-6 (MW-3) and completed to a depth <br /> of 61 5 feet bgs in order to determine the radius of influence of the VES and extent of <br /> hydrocarbons, if any, in this direction Previously, low levels of benzene, toluene, <br /> ethyl benzene and total xylenes, less than 0 038 ppm, were detected in soil at depths <br /> 1 from 20 to 65 feet bgs at this location <br /> Three to four soil samples were collected from each confirmation boring and were submitted to <br /> Argon Laboratories of Modesto, California (DOHS Lab No 1873) for analysis of TPHg and <br /> BTEX by EPA Methods 801518020, and TPHd by EPA Method 8015 In addition, two soil <br /> ' samples from borings CB-6 and CB-7 were submitted to Sequoia Analytical of Redwood City, <br /> California for analysis for parameters for possible modeling purposes Copies of chains of <br /> custody and laboratory reports are contained in Appendix C <br /> Petroleum hydrocarbon compounds were detected only in one sample from confirmation <br /> 1 boring CB-2 at 21 5 ft bgs Ethyl benzene and total xylenes were detected in the sample at <br /> concentrations of 0 010 ppm and 0 16 ppm, respectively Petroleum hydrocarbon analytical <br /> Iresults of soil samples collected from the borings are summarized in Table 1 under the <br /> n 10540061reports\CLOi 195 doc 10 <br /> • <br /> SMTH <br /> 1 <br />