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ru r� <br /> CLEARWATER <br /> G R O U P <br /> • Errv,,vn enfa! Servrces <br /> is existing fuel transport lune in the area if the site, and that it is currently filled with nitrogen gas <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 - Fust Quarter 1999 <br /> In March 2000, Clearwater supervised the completion of one hydropunch, six soil borings, the <br /> destruction of MW-5, and the installation of three monitoring wells (MW-5B, MW-7, and MW-8) in <br /> three of the soil borings All three wells were placed on the downgradient portion of the plume to help <br /> determine the downgradient extent of contaminants The hydropunch was performed In the former UST <br /> location to assess the vertical extent of groundwater contamination at 36 feet bgs Three soil borings <br /> were performed to defile 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 un 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 gg/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 October 11,2001 <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 8260B) <br /> Laboratory Kiff Analytical LLC, (Davis, CA) <br /> Remarks None <br /> ZB178C-4QT01 3 November 1,2001 <br />