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Groundwater Monitoring Well Installation Work Plan 2 <br /> The Southland Corporation-Store#20632 4627 Da Vinci Drive Stockton,CA November 30.1998 <br /> TASK 2: SOIL BORINGS/SOIL SAMPLING <br /> Fluor Daniel GTI will drill one soil boring at the location shown on Figure 2 using a truck-mounted drill rig <br /> equipped with 84nch-diameter hollow-stem augers. The location of the well was chosen based on <br /> hydrocarbon and oxygenate concentrations detected in soil samples collected from previous soil borings <br /> drilled at the site. Historical groundwater and soil analytical results are included in Attachment 2. The <br /> boring will be drilled to approximately 20 feet below ground surface (BGS), and will provide additional <br /> information to characterize and delineate the extent of the soil hydrocarbon plume. <br /> Soil samples will be collected from the soil boring at 5-foot intervals to a total depth of 20 feet BGS <br /> beginning at 5 feet BGS using a split-spoon sampler lined with 2-inch-diameter by 6-inch-long brass sample <br /> tubes. The hollow-stem augers will be steam cleaned before drilling, and sampling equipment will be <br /> cleaned between each sampling interval. Each soil sample will be screened for hydrocarbon vapors using <br /> a photoionization detector(PID). Soils encountered during drilling will be logged using the Unified Soil <br /> Classification System by a Fluor Daniel GTI field geologist,working under the supervision of a California <br /> registered geologist. One sample tube from each sampling interval will be sealed with Teflon sheets, <br /> capped,taped, labeled, and placed on ice in an insulated container. <br /> Based on field observations,selected soil samples from the borehole will be analyzed by a State-certified <br /> analytical laboratory for benzene,toluene,ethylbenzene,xylenes(BTEX),methyl-tert-butyl ether(MTBE), <br /> and total petroleum hydrocarbons-as-gasoline (TPH-G) by EPA methods 8020/8015 modified,and the <br /> oxygenates:tert butanol (TBA), MTBE,di-isopropyl ether(DIPE),ethyl-tert-butyl ether(ETBE),and tert- <br /> amyl-methyl ether(TAME) by EPA Method 8260. An estimated three soil samples will be analyzed from <br /> the boring. <br /> All soil generated through drilling will be placed in Department of Transportation (DOT)-approved 55-gallon <br /> drums pending characterization and disposal. Water generated by steam cleaning will be temporarily <br /> stored on site in DOT-approved 55-gallon drums pending characterization and disposal. All waste will be <br /> disposed of as non-hazardous at a certified facility by a licensed hauling firm. <br /> TASK 3: WELL CONSTRUCTION/DEVELOPMENT/GAUGING/SAMPLING <br /> One groundwater monitoring well (MW-5)will be constructed in the boring of 2-inch diameter Schedule 40 <br /> poly-vinyl-chloride (PVC)casing with flush threads and 0.0204nch-slot well screen from 5 feet to 15 feet <br /> BGS. Prior to installation of the well casing,hydrated bentonite chips will be placed in the borehole from <br /> 20 feet to approximately 16 feet BGS. A sand filter pack will be placed around the well screen to a <br /> maximum height of 1 foot above the top of the screen. The well casing will be sealed with 2 feet of <br /> hydrated bentonite pellets,followed by a neat-cement grout to grade containing a mixture of 95 pounds of <br /> 20632wkp.ftr <br /> FLUOR DANIEL GTI <br /> i"«1 <br />