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t <br /> Work Plan Evaluation of Soil and Ground eater December 4, 1989 <br /> Unocal Station No. 6981, Stockton, California AGS 38032-3W <br /> r <br /> SUMMARY OF WORK <br /> the work tasks to evaluate soil and groundwater conditions at the Unocal site includes the <br /> following: <br /> o Update and revise the Site Safety Plan. <br /> o Provide liaison with the San Joaquin County Public Health Services, <br /> Environmental Health Division(SJCPHS),to acquire permits for drilling and <br /> inspection of well construction. <br /> Q o Drill five soil borings to approximately 60 feet below surface grade to <br /> construct monitoring wells and to evaluate the vertical extern,.of suspected soil <br /> contamination. During.the drilling of three of the borings, a 5-foot-long <br /> continuius.core sampler will be used to provide a continuous log (provided <br /> that samples can be recovered) of the soil encountered between the 5-foot <br /> +: undisturbed sample intervals. <br /> o Collect and classify relatively undisturbed soil samples taken at 5-foot intervals <br /> for possible laboratory analysis. <br /> o Construct ground-water monitoring wells in each of the five boreholes onsite. <br /> The wells will be constructed using 4-inch inner-diameter polyvinyl chloride <br /> (PVC) casing. One monitoring well will be constructed with continuous <br /> wrapped screen for use as a pumping well if necessary. <br /> o Develop and purge the wells and collect groundwater samples. <br /> o Submit two soil samples from each boring for chemical analyses. Soil samples <br /> submitted for analysis will be analyzed for total petroleum hydrocarbons as <br /> gasoline(TPH)using Environmental Protection Agency (EPA) Method 8015 <br /> with EPA extraction Method 5030, and for benzene, toluene, ethvlbenzene, <br /> and xylene (BTEX) using EPA Method 8020. <br /> o Submit one groundwater sample from each monitoring well for chemical <br /> analysis. Samples will be analyzed TPH using EPA Method 8015 with EPA <br /> extraction Method 5030, BTEX using EPA Method 602. Four of the ground <br /> 12 <br /> �' Applied G&OSYSImS <br />