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rr � <br /> CLEARWATER <br /> G R O U P <br /> En vrronmenlaf Sa.vrcrs <br /> Based on this information, Clearwater recommended additional investigation along South Fresno <br /> Avenue to better understand the distribution of contamination and possible contribution from potential <br /> off-site sources The results of this phase of investigation were presented in Clearwater's Well <br /> Installation and Groundwater Monitoring Report - First Quarter 1999 <br /> In March 2000, Clearwater supervised the completion of one hydropunch, six soil borings, the <br /> destruction of MW-5, and three of the borings were converted into monitoring wells (MW-5B, MW-7, <br /> and MW-8) All three wells were placed an the downgrachent portion of the plume to help determine <br /> the downgradient extent of contaminants The hydropunch was performed in the former UST location to <br /> assess the vertical extent of groundwater contamination at 36 feet bgs Three soil borings were <br /> performed to define the lateral extent of soil and groundwater contamination on the northeastern <br /> portion of the site and assess possible off-site sources A total of three soil samples and one groundwater <br /> sample were analyzed from each boring Soil concentrations of TPHg and BTEX were only detected in <br /> boring MW-5B The highest soil concentration of TPHg (1,000 mg/kg) was detected at 25 feet bgs in <br /> MW-5B This sample was also analyzed for TPH as Jet Fuel and contained 55 mg/kg Detectable <br /> concentrations of BTEX were present in soil samples collected from boring MW-5B at 25 feet and 35 feet <br /> bgs MTBE was not detected by EPA method 8260 in any of the soil samples analyzed Groundwater <br /> concentrations of TPHg and BTEX were detected in borings SB-9, MW-5B, MW-7 and MW-8 The <br /> highest groundwater concentration of TPHg (9,700 µg/L) was detected in MW-5B MTBE was not <br /> detected by EPA method 8260 in any of the groundwater samples analyzed <br /> GROUNDWATER MONITORING AND SAMPLING ACTIVITIES <br /> Date of groundwater sampling August 22,2001 <br /> Wells gauged MW-1 through MW-8 <br /> Wells purged and sampled MW-1 through MW-8 <br /> Analytes tested TPHg/BTEX/MTBE(EPA Method 8015M/8020/8260B) <br /> Laboratory Entech Analytical Labs, (Sunnyvale, CA) <br /> Remarks None <br /> ZB178C-3QT01 3 September 17,2001 <br />