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f � <br /> Chevron/Airport 6 <br /> February 1991 <br /> SCOPE OF WORK <br /> Subsurface so!f and water conditions at tt, i site were investigated to assess the presence and <br /> extent of adsorbed or dissolved gasoline hydrocarbons. The following Is a summary of the work <br /> performed ter this Investigation: <br /> o Performed an historical review of land-use and an environmental sunray cf ttre <br /> surrounding area. This research Included a review of atrial photographs from 1968 to <br /> 1990 available from Pacific Aerial Surveys In Oakland,Cai''rymia. <br /> a Obtained a well permit from the San Joaquin County Dearth Services Environmer.'.2i <br /> Health Division to Instarl three,monitoring wells at this site. A copy of the permit Is <br /> Included In Appendix A. <br /> o Drilled and logged three on-site soil borings. Soil boring locations were selected to <br /> assess the character of dissolved petroleum hydrocarbons In the groundwater beneath <br /> the site. <br /> ! <br /> . o Irn-talled three 2-inch-dlameter,polyvinylchloride(PVC)groundwater-monftortng wells In <br /> the soil borings. After installation,the wails were surveyed bu 2 professional surveyor to <br /> establish location and wellhead elevation. <br /> P, o Prepare ibis summary report,which includes the results and findings of tie <br /> [ovestigation. <br /> HISTORICAL VICINITY LAND-USE AND ENVIRONMENTAL SURVEY <br /> Information from the San Joaquin County and State of California agencies ws^e utilized to obtain ; <br /> InformWon for this environmental survey. Aerial pho!.rgraphs dating from 1969 to 1990 were revleua3d <br /> to determine historical land use. <br /> ! <br /> Iri s GROUNDWATER } <br /> ! �t TECHNOLOGY,INC. <br /> R_ <br />