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I' E CAMBRIA Mr. Ron Rowe i C6 October 15, 1997 i Site Health and Safety Plan: We will prepare a comprehensive site safety plan to protect site workers. The plan will be kept on site during-field activities and signed by each site worker. Permits: Cambria will obtain well permits from SJCPHS for the boring(s) and installation of the well(s). A boring permit application and a check for the permit fee in the amount of$89 are attached. Soil Boring: Cambria will drill the first soil boring-to at least a 35 feet depth in the location near the southern dispenser island shown on Figure 1.This boring will be installed using a drill rig equipped with 8-inch hollow-stem augers,and a 5-foot long core barrel for continuous sampling. The sample cores will be preserved in acetate. If hydrocarbons are detected in soil or ground water during the installation of the first boring,two additional j wells will be installed during the same mobilization. Field detection of hydrocarbons can be achieved by visual or olfactory means,or by a portable volatile vapor.analyzer. The proposed locations for these wells are shown in Figure 1. Soil Sampling: In addition to the Cambria standard protocol,Cambria will select soil samples for chemical analysis based historical ground water levels,on observations of staining and odor,and on the results of field screening with a portable vapor analyzer. At a minimum, three soil samples from the first boring will be analyzed: one each from the historically lowest ground water level(35 feet),the highest ground water level(5 feet).,and the capillary fringe(expected 1 to be approximately 20 feet,based on your information).The San Joaquin County Flood Control and Water Conservation District map entitled"Lines of Equal Depth to Water in Wells"dated Fall 1977 is the reference that was used to determine the historically low ground water level. i If hydrocarbons are observed in the first boring,two additional wells will be installed. These borings will extend to approximately 25 feet and sampled at 5-foot intervals with a modified California split spoon sampler. One soil sample from each distinct lithological unit across the site will be preserved for physical analyses. For each location, Cambria will attempt to preserve two brass tubes, each 6 inches long by 2 inches in diameter. Soil observed to contain hydrocarbons will not be used for physical analyses. Water Sampling: For the first soil boring, Cambria will take discrete ground water samples at five foot intervals from the capillary fringe to the historically lowest ground water level. A BAT sampler will be used 2