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f <br /> Site Assessment Report April 5, 1991 <br /> 139 South Center,Stockton,CA Page 5 <br /> SCOPE OF WORK <br /> is <br /> Subsurface soil and water conditions at this site were investigated to assess the presence and <br /> extent of adsorbed or dissoW 4d subsudace gasoline hydrocarbons. The following is a summary of the <br /> it <br /> work performed for this 4nvestlgation: <br /> o Obtained a well permit from the San Joaquin County Public Health Department, <br /> Environments Health Division to install four groundwater-monftoring wells at this site. A <br /> copy of the permit is lrx-uded in appendix A. <br /> o Drilled and logged four on-slte soil borings. Soil boring krcations were selected to <br /> assess the character of dissolved petroleum hydrocarbons in the groundwater beneath <br /> the site. <br /> a Installed four,2-inch-diameter,polyvinyl chloride(PVC)groundwater-monitoring wells In <br /> the soil borings. After installation,the wells were surveyed by a professional surveyor to <br /> establish location and wellhead elevation. <br /> r o Prepared this summary report,which Includes the results and findings of the <br /> t-a Investigation. <br /> Y <br /> ti MONITORING-WELL INSTALI-ATION PROCEDURES <br /> I kgs Four borings for the installation of groundwater-monitoring wells(MW-1,MW-2, <br /> tq MW-3 an:i MWA)were drilled on site on February 14 and 15, 1991,and February 19, 1991. The <br /> locations of these borings are shown on the Site Pian (Figure 2). The boring locations were selected <br /> t� primarily to determine the gradient and quality of the first saturated zone beneath the site. Each boring <br /> was drilled usir g a truck-mounted rotary drill N with 85-inch outside-diameter(O.D.).hollow-stem <br /> kn augers. Drilling was supervised by a Groundwater Technology field geologl;t,who maintained a <br /> continuous log of the materials encountered In accordance with the Unified Soil Classification System <br /> and selected so'f samples for possible laboratory analyses. For the borings for MW-1,MW-2 and MW-3, <br /> a Moot-long core barrel was used to obtain a continuous core of the intervals drilled. Sail samples for <br /> OROUNMATER <br /> TEMOLOCY,INC. ' <br /> p!➢di twat <br />