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13975 Hwy. 88 - 3 - 11 December 1998 <br /> Lockeford, San Joaquin County <br /> Summary: <br /> The lateral and vertical extent of soil and groundwater contamination at this site have been defined. <br /> The remaining contaminant mass is present in silt and clay located between 30 and 45 feet bgs. The <br /> mass calculation provided by AGE on 10 November 1998,based on analytical data collected during the <br /> drilling and sampling of MW-2 (1987) and SB-9 (1995), estimates 1151 pounds of TPH,or 1.84 gallons <br /> of gasoline were present in soil during the drilling/sampling activities. Residual soil contamination is <br /> limited in vertical and lateral extent, and appears to be isolated to the vicinity of MW-2 and SB-9. Low <br /> concentrations of TPHg were also reported to a depth of 60 feet bgs, in the soil borings for MW-2 and <br /> MW-3. Residual groundwater calculations could not be estimated,based on non-detectable laboratory <br /> reports for groundwater samples. . <br /> All groundwater monitoring wells reported nondetect for TPHg,BTEX, and the fuel oxygenates for the <br /> 26 May 1998 sampling event, with appropriate detection limits. The highest groundwater elevation, <br /> approximately 60 feet bgs,was reported during 1987. The remaining contaminants are present in low <br /> permeability units between approximately 35 and 45 feet bgs, and pose little threat to water quality. <br /> Based on the information provided we should concur with the SJCEHD determination of no farther <br /> action required for this site. <br />