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Mr. Kenneth Earnest <br /> Ultramar Inc. <br /> November 5, 1993 <br /> Page 3 <br /> per billion (ppb) and TPH as gasoline at a concentration of 68 ppb. Monitoring wells MW-1 and <br /> MW-2 did not contain concentrations of petroleum hydrocarbons with the exception of xylenes at 1.1 <br /> and 2.6 ppb, respectively. <br /> Monitoring wells MW-1, MW-2, and MW-3 were resampled on September 8, 1993. Analytical test <br /> results indicate that petroleum hydrocarbons were not detected with the exception of xylenes in the <br /> samples collected from monitoring wells MW-2 and MW-3, at concentrations of 0.97 and 0.68 ppb, <br /> respectively. <br /> Analytical results for the ground water samples are summarized in Table 3. Analytical laboratory <br /> reports for ground water samples collected on August 27 and 31, 1993, are included in Enclosure C, <br /> and analytical laboratory reports for ground water samples collected on September 8, 1993, are <br /> included in Enclosure F. <br /> Discussion <br /> Analytical test results indicate that relatively low concentrations of petroleum hydrocarbons are <br /> present in soil beneath the west pump island at depths of approximately 26 and 41 feet_ Ground <br /> water samples collected from the monitoring wells on August 27 and 31, 1993, and <br /> September 8, 1993, contained relatively low concentrations of petroleum hydrocarbons. Since only <br /> relatively low concentrations of petroleum hydrocarbons were detected in two of the soil samples, <br /> and none of the soil samples within 25 feet of the ground water table contained detectable <br /> concentrations of petroleum hydrocarbons, it appears that the petroleum hydrocarbons in ground <br /> water may have potentially migrated from an off-site source. <br /> Remarks/Signatures <br /> The interpretations contained in this report represent our professional opinions,and are based in part, <br /> on information supplied by the client. These opinions are based on currently available information <br /> and are arrived at in accordance with currently accepted hydrogeologic and engineering practices at <br /> this time and location. Other than this, no warranty is implied or intended. <br />