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WORK PLAN FOR GROUNDWATER INVESTIGATION <br />Chevron Service Station # 94054 <br />Stockton, CA <br />October 26, 2016 <br />photoionization detector (PID). Two soil samples will be analyzed from each boring based on <br />one from the highest PID reading and one from the vadose zone that is directly above the water <br />table. Additional samples will be collected and analyzed as warranted. The samples will be <br />placed under ice in an insulated cooler until relinquished and shipped, under documented <br />chain-of-custody control, to a certified analytical laboratory. Select soil samples will be analyzed <br />for TPHg using Environmental Protection Agency (EPA) Method 8015B(M) and for benzene, <br />toluene, ethylbenzene, total xylenes (collectively BTEX) using EPA Method 8260B. <br /> <br />3.6 INVESTIGATION DERIVED WASTE <br />Soil cuttings and decontamination rinsate water (investigation derive waste [IDW]) generated <br />during the field activities will be stored in Department of Transportation approved 55-gallon <br />capacity steel drums. The containers will be staged on-site pending laboratory characterization <br />as non-hazardous waste. The IDW transportation and disposal will be coordinated by Stantec. <br /> <br />4.0 Reporting and Scheduling <br />The activities outlined in this work plan will commence after receiving approval on the scope of <br />work from the CVRWQCB and budget approval from the State of California UST fund. Stantec <br />anticipates completing the field work over a span of five days for monitoring well installation and <br />sampling. <br />A summary report outlining the soil boring advancement activities and sampling of newly <br />installed groundwater monitoring wells will be submitted to CVRWQCB within eight weeks <br />following receipt of the final certified laboratory analysis reports for the groundwater sampling <br />event. The summary report will include a description of field activities; an updated Site location <br />map; and a summary of analytical results, data interpretation, and certified laboratory analysis <br />reports and chain-of-custody documents. <br />Stantec <br />6