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C ed1ogica l Technics lac. <br /> 1 101 7"Street <br /> Modesto,California 95354 <br /> (209)522-4119/Fax(209)522-4227 <br /> Work Plan <br /> Soil & Groundwater Investigation <br /> Former Texaco Facility <br /> 401 N. San Jose Street <br /> Stockton, CA <br /> Project No. 879.2 <br /> March 29, 2002 <br /> 1.0 INTRODUCTION <br /> The site of a former Texaco facility is located at 401 N. San Jose in Stockton, California <br /> (see Figure 1). The purpose of this investigation is to determine if gasoline and/or diesel <br /> has been released from fuel storage systems at the site. <br /> 2.0 PROPOSED INVESTIGATION <br /> In an effort to determine if gasoline and/or diesel range petroleum hydrocarbons are present <br /> in the soil and/or groundwater under the site, Geological Technics Inc. (GTI) proposes to <br /> install ten GeoProbe boreholes, collect soil/groundwater grab samples and analyze these <br /> samples for petroleum hydrocarbons. A health and safety plan is included as Appendix A. <br /> 2.1 GeoProbe Survey <br /> Ten GeoProbe boreholes will be advanced in the locations indicated in Figure 2. <br /> Soil Sample Collection <br /> The boreholes will be drilled with a GeoProbe rig owned and operated by V&W Drilling of <br /> Rio Vista, CA (C57# 720904). The GeoProbe advances a coring tool with a pneumatic <br /> hammer to a selected depth. Upon reaching that depth the coring tool is opened and <br /> advanced further to fill the core barrel. The soil sample enters an acetate cylinder contained <br /> in the coring tool. Upon filling, the coring tool is pulled from the hole and the cylinder is <br /> removed. The cylinder is then cut and the selected interval is capped with Teflon foil and <br /> end caps and placed on ice for shipment to the laboratory. The remainder is used for <br /> geologic logging. A boring log providing sediment description using the USCS and other <br /> field observations will be maintained by a professional geologist working under the <br /> supervision of a registered geologist. <br /> Soil samples will be collected at five-foot intervals down to groundwater. One soil sample <br /> from each borehole will be submitted to the laboratory for analysis. This sample will be <br />