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Mr Ron Rowe <br /> C A M B R I A August 17, 1998 <br /> Offsite Well Investigation <br /> On July 22, 1998, Cambria removed the pump and piping from the well at 333 E Main, which is <br /> immediately adjacent to the Shell-branded station at 341 E Main The well location is shown on <br /> Figure 1 The depth to water was 26 65 ft, and the total depth of the well was 66 50 ft Cambria <br /> collected a grab water sample from the well and analyzed it for the same components as the ground <br /> water samples from the CPT investigation <br /> Cambria collected a water sample from a CalTrans irrigation well located southeast of the Shell-branded <br /> station The well pump was turned on for five minutes, and a sample was collected from a sample tap <br /> at the well head The sample was analyzed as described above <br /> Onsite Well Purging and Sampling <br /> Cambria pumped and sampled existing onsite monitoring well MW-1 The initial depth to water was <br /> 26 85 ft, and the total well depth was 27 2 ft The well was pumped dry a total of four times during a <br /> period of one hour and 15 mmutes,during which a total of seven gallons of water were pumped from <br /> the well Samples were taken at the beginning and end of the pumping, and analyzed for the same <br /> parameters as the CPT ground water samples The analytical results are included in Table 3 <br /> RESULTS <br /> CPT Soil Analytical Results No TPPH, BTEX,TAME, DIPE, ETBE, ter -Butanol, or ethanol were <br /> detected in the soil samples analyzed,except for 0 00806 milligrams per kilogram(mg/kg)ethylbenzene <br /> and 0 110 mg/kg xylenes from boring CPT-1 at a depth of 20 ft MTBE was detected in five samples <br /> from CPT-1, with a maximum concentration of 27 mg/kg in the sample from 29 ft bgs MTBE was not <br /> detected in any of the samples from the other borings Methanol was detected in ten of the samples, <br /> with a maximum concentration of 5 1 mg/kg at 20 ft bgs in CPT-1 Soil analytical results are <br /> summarized in Table 1 Complete analytical reports are included in Attachment C Analytical results <br /> for physical parameter will follow later under separate cover <br /> CPT Ground Water Analytical Results: No TPPH, BTEX, TAME, DIPE, ETBE, tert-Butanol, or <br /> ethanol were detected in the grab ground water samples from any of the CPT borings MTBE and <br /> methanol concentrations were detected at maximum concentrations of 170,000 micrograms per liter <br /> (gg/L), and 59 pg/L,respectively,in boring CPT-1 Methanol is a common laboratory contaminant <br /> I0 <br /> 1 4 <br />