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u �) <br /> Soil and Groundwater Investigation <br /> Quik Stop No 121 <br /> Page 3 <br /> SCOPE OF WORK <br /> As previously stated, the purpose of this investigation was to determine the extent of soil and <br /> groundwater contamination discovered during the tank removal operation conducted in March 1998 <br /> The following procedures were undertaken in completing the investigation <br /> I) Explored subsurface soil and groundwater conditions at the site using a Geoprobe <br /> Continuous Core Sampler(GCCS), <br /> 2) Obtained soil and groundwater samples to be analyzed for the presence of total petroleum <br /> hydrocarbons as gasoline (TPHG), benzene, toluene, ethlybenzene, and total xylenes <br /> (BTEX) and methyl-tertiary-butyl-ether (MTBE) In addition, the groundwater samples <br /> were analyzed for oxygenates using EPA Test Method 8260, <br /> i <br /> 3) Analyze three soil samples for porosity and specific gravity using ASTM D-854, <br /> 4) Conducted a 2,000-foot radius well survey for domestic, municipal and irrigation wells, <br /> 5) Presented the results of the investigation and findings in this summary report <br /> FIELD INVESTIGATION <br /> Prior to beginning the field work, a boring permit was obtained from the San Joaquin County Public <br /> Health Department In addition, the proposed locations of the GSS sample points were "cleared" <br /> of utility lines using an underground line location service and by notifying Underground Service <br /> Alert(U S A) CCI conducted the field work for this investigation on October 19 and 20, 1998 The <br /> field work included continuously coring by "direct pushing" a total of five GSS probe locations <br /> (Figure 2) <br /> A total of twenty-one soil samples and five grab water samples were collected for chemical analysis <br /> during the investigation Three additional soil samples were collected for analysis of porosity and <br /> specific gravity at a geotechnical laboratory <br /> Geoprobe Continuous Core Sampling <br /> CCI subcontracted Precision Sampling Inc (Precision) of San Rafael, California to use its Geoprobe <br /> Continuous Core Sampling System (GCCS) to collect soil and groundwater samples from five <br /> selected locations at the subject site(Figure 2) CCI used the GCCS because it creates only a small <br /> • hole in the pavement and generates very little soil cuttings during sampling <br />