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D.sa[voli.tlav\004'" ' October 4 1995 PW-3- . total extractable hydrocarbons, quantified as diesel, kerosene and motor oil (TEPH) by Method I3510ALUFT One trip blank was carried in the cooler in which the groundwater samples were placed The trip blank was returned, unopened, to the laboratory A SJCPHS,EHD Irepresentative was on site during sampling activities RESULTS OF ANALYSES Laboratory analyses of the confirmation groundwater sample collected from MW1 detected no evidence of hydrocarbon contamination at or above the laboratory reported detection limits The results of the laboratory analyses are listed in Table 1 Laboratory report sheets Iindicating analytical methods used, detection limits, and results of analyses are attached Table 1 Results of Analyses - Di Salvo Trucking Lathrop, California TEPH B T E X Kerosene Diesel Motor Oil Detect,on 03 03 03 06 005 005 05 Sample ID Limits: µg/1 µg/1 99/1 µ9/1 Mg/1 mg/1 mg/1 1418-MW1-9/25/95 ND ND ND ND ND ND ND Out Converstons µfill parts per bdhon(ppb) B==benzene,toluene,ethyl benzene,and xylene -fill parts per mtlhon(ppm) TEPH=total extractable petroleum hydrocarbons quantified as kerosene,diesel and otor ail ND=none detected at or above laboratory detection hurt REMAINING SOIL CONTAIVIINATION I Based on laboratory analyses of the soil samples collected following UST removal, over- excavation and Installation of MW 1, the lateral extent of soil contamination has been evaluated at the DI Salvo Lathrop site The concentrations of hydrocarbon constituents detected in the soil sample collected from beneath the east end of TK4 at approximately 15 5 feet bgs were used to estimate the mass of contamination remaining in the subsurface at the site Condor assumed the contamination is dispersed homogeneously throughout a cylindrical volume of soil located at the east end of TK4 The radius of the cylinder is one half the distance from the east end of TK4 to the nearest non-detect soil sample or approximately 5 feet The height of the cylinder is the distance from the detected soil contamination, 15 5 feet, to the low permeable silt layer at 16 feet, �� CONDOR