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s� <br /> MEMO <br /> �4 <br /> PRG TANK REMOVAL SOIL ASSESSMENT <br /> 620 West Charier way,3toe§ton,CA <br /> j Delta Project No.40-88-686 <br /> Page 8 <br /> r� <br /> j To evaluate the distribution of petroleum constituents in soiis and ground water, the installation of <br /> monitoring wells at the site is proposed. A complete description of proposed monitoring well <br /> h installation will be presented in a work plan which is currently being prepared. <br /> E,y5.0 METHODSD PROCEDURES <br /> f 5.1 Drilling and Soil S rn lln <br /> Soil borings were drilled using a mobile B-80 drilling rig and 8-inch-diameter hollow-stem augers. <br /> The soil borings were drilled to a maximum depth of 30 feet below ground surface. <br /> i <br /> 0 Samples of subsurface soils were obtained using a California modified spilt-spoon sampler. Samples <br /> I were collected and examined from each cf the four soil borings. All soil samples were collected in <br /> glass jars and headspace gas measurements of total organic vapors were made with at.hNu PID. The <br /> readings from the PID are recorded on the soil boring logs presented in App6'ldix A. <br /> All drilling and sampling equipment was cleaned before drilling each boring using a high-pressure, <br /> steam-cleaning apparatus. The split-spoon sampler was cleaned with phosphate-free soap and rinsed <br /> with water following each sample collection. <br /> i ? <br /> 5,2 <br /> :2 <br /> Soil Classification <br /> E All soil samples were examined in the field by a geologist and described for color, grain size, <br /> ► moisture content,mineral content,and odor,and were classified in accordance with the Unified Soil <br /> ( , Classification System. <br /> 5.3 Analytic ll 5aMnle Selection and Preservation <br /> f A soil sample from the bottom of each borehole was submitted to the laboratory for analysis. In <br /> addition,a second sample from each of the soil borings surrounding the tank cluster was submitted <br /> for analysis on the basis of the results of PID screening. <br /> Groutin¢of$oil B ro_tnoc <br /> All soil borings were grouted from the bottom of the borehole to ground surface on February 10, <br /> `r 1989. Approximately 1 cubic foot of bentoniii)was emplaced at the bottom of each borehole prior <br /> to grouting. The grout consisted of a cement/sand slurry. <br />