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Work Plan for Additional Soil and Groundwater Assessment 2 Chevron U.S.A. Products Company, 139 South Center St., Stockton, CA October 19, 1994 in the City of Stockton public right-of-way will be obtained from the City Department of Public Works. The access agreement for the off-site groundwater monitoring well will be obtained from the State of California Department of Transportation (Cal-Trans). Task 2: Soil Borings/Soil Sampling Groundwater Technology will drill a total of four soil borings (three for soil sampling only and one for groundwater monitoring well installation) at the locations shown on Figure 1 (Attachment 1) using a truck-mounted drill rig equipped with 8-inch-diameter hollow-stem augers. The two soil borings located south and west of the former gasoline UST cavity will be drilled and sampled to 'approximately 45 feet below around surface (BGS), the estimated depth to groundwater. The angled soil boring located east of the sumo islands will be drilled at a angle of 30 degrees from vertical to a point approximately 45 feet beneath the center of the eastern pump island. The boring drilled to accommodate groundwater monitoring well installation will be drilled and sampled to a depth of approximately 60 feet BGS. Soil samples will be collected from each soil boring at 5400t intervals beginning at 5 feet BGS using a split-spoon sampler lined with 2-inch-diameter by 6-inch-long brass sample tubes. The hollow- stem augers will be steam cleaned before drilling, and sampling equipment will be cleaned between each sampling interval. Each soil sample will be screened for hydrocarbon vapors using a photoionization detector (PID). Soils encountered during drilling will be logged using the Unified Soil Classification System by a Groundwater Technology field geologist, working under the supervision of a California registered geologist. One sample tube from each sampling interval will be sealed with aluminum foil, capped, taped, labeled, and placed on ice in an insulated container. Based on field observations, selected soil samples from each borehole will be analyzed by a State-certified analytical laboratory for benzene, toluene, ethylbenzene and xylenes (BTEX), and total petroleum hydrocarbons-as-gasoline (TPH-G). All soil generated through drilling will be placed on and covered with plastic sheeting on site pending characterization and disposal. Water generated by steam cleaning will be contained in a steam- clean trailer and temporarily stored on site in Department-of-Transportation (DOT) approved 55- gallon drums. 006BASGS.WKP(CHV-54) ❑❑`� GROUNDWATER —I❑ TECHNOLOGY .