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CeaCogceaC Tec �cccs l�cc. <br /> �` :. 1101 7'Street <br /> LModesto,Califomia 95354 <br /> (209)522-4119/Fax#5224227 <br /> tri <br /> Work. Plan <br /> Soil and Groundwater Investigation <br /> Cardoza Enterprises <br /> . <br /> 1,151 Louise Avenue <br /> Manteca, CA <br /> Project No. 1135.2 <br /> December 2, 2003 <br /> 1.0 -INTRODUCTION <br /> . In November of 2002.soil samples were obtained from beneath the gasoline dispenser islands <br /> at the site. A minor amount of MTBE(0.09 mg/kg).-was detected in soil sample "D-3". <br /> In a letter dated October 17; 2003 Cardoza Enterprises was directed by San Joaquin County <br /> Environmental Health Department to submit 'a work plan to determine the vertical and . <br /> horizontal extent of the contamination(see Figures 1 &2). <br /> 2.0 PROPOSED INVESTIGATION <br /> To further investigate the extent of soil and, groundwater impacted with gasoline range <br /> petroleum hydrocarbons, Geological Technics' Inc. proposes to install three (3) GeoProbe <br /> boreholes (GP4 through GP-3) collect soil and groundwater samples, and -analyze .these <br /> samples for petroleum hydrocarbon compounds. <br /> {•,= The proposed locations.of-the GeoProbes are illustrated in Figure 2. The locations are <br /> intended to define the extent of the soil plume and to-determine if groundwater has been <br /> impacted by the release. The actual location of the probes will be selected in the field, as <br /> numerous utility lines exist below ground surface at the site. <br /> 2.1 GeoProbe/Hydropunch Survey <br /> +� Soil Core Sampling <br /> Three GeoProbe boreholes will be drilled as indicated in.Figure 2 to a maximum depth of 35 <br /> feet below grade surface. Soil samples will be collected at five-foot intervals down to the <br /> capillary fringe. <br /> The boreholes will be drilled with a GeoProbeFrig owned and operated by V&W Drilling of <br /> Isleton, CA (C57# 720904). The GeoProbe advances a coring tool with a pneumatic hammer <br /> to a selected depth. Upon reaching that depth the coring tool is opened and,advanced further <br /> 1 <br />