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Mr Bill Vizza <br /> 1 June 1994 <br /> Page 4 <br /> Soil Results <br /> Laboratory results for the soil sample collected at a depth of ten feet from B-IB are presented in <br /> Table 3 As shown in Table 3, toluene was the only chemical detected at a concentration greater <br /> than its method detection limit The concentration of toluene detected is 0 007 mg/Kg with a <br /> method detection limit of 0 005 mg/Kg <br /> CONCLUSIONS <br /> Historic use of the former underground storage tank indicates that total petroleum hydrocarbons <br /> as diesel and benzene, toluene, ethylbenzene, and total xylenes are the chemicals of concern for <br /> this project Laboratory results for groundwater samples collected during October 1993 and April <br /> 1994 indicate that no detectable concentrations of total petroleum hydrocarbons as diesel and <br /> benzene, ethylbenzene, and total xylenes are present in site soil or shallow groundwater in the <br /> vicinity of the former underground tank Although toluene was detected at a concentration of <br /> 0 007 mg/Kg in a soil sample collected from a depth of 10 feet below ground surface at a location <br /> adjacent to the east end of the former underground storage tank, none of the other chemicals of <br /> concern were identified at a concentration greater than their method detection limits The <br /> concentration of toluene detected in the B-IB soil sample is slightly greater than the method <br /> detection limit of 0 005 mg/Kg Since benzene has not been detected in any of the groundwater <br /> or soil samples analyzed to date, it is concluded that the finding of very low concentrations of <br /> toluene in one soil sample does not indicate a significant potential impact to shallow groundwater <br /> RECOMMENDATIONS <br /> During our 7 March 1994 meeting with San Joaquin County Environmental Health Division, it was <br /> agreed that the former underground storage tank site would be closed if it was demonstrated that <br /> no chemicals were detected at concentrations greater than the method detection limit for the second <br /> set of groundwater samples collected during March 1994 and if concentrations of total petroleum <br /> hydrocarbons as diesel in soil collected from beneath the former underground tank location were <br /> less than 100 mg/Kg As indicated in this report, both criteria have been satisfied <br /> We recommend that this report be submitted to San Joaquin County Environmental Health <br /> Department On the basis of the findings and laboratory results for this project, it is recommended <br /> that no further site investigations be required and that site closure be approved by San Joaquin <br /> County Environmental Health Department <br />