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Morita Brothers Service Station Z O November G, 1992 <br /> °r <br /> ' The data obtained from the tank removal operations suggest that soil impacted with <br /> gasoline hydrocarbons at concentrations in excess RWQCB recommended guidelines <br /> exist at the subject site in an area beneath the former location of the 5,000 gallon <br /> underground unleaded gasoline tank as well as the product pipeline associated with <br /> the northern gasoline dispensers <br /> ' The subsequent soil drilling activities indicate that gasoline hydrocarbons in excess <br /> of 10 mg/kg are confined to a depth of less than 25 feet below surface at the location <br /> ' of the former 5,000 gallon unleaded gasoline tank, and less than 20 feet at the <br /> location of the product pipeline associated with the northern gasoline dispensers, <br /> and less than 10 feet laterally from the former tank, and less than 10 feet laterally <br /> ' from the former location of the product pipeline associated with the northern <br /> gasoline dispensers <br /> There is a single anomalous laboratory result of benzene detected at a concentration <br /> g Y <br /> ' of 10 mglkg, and toluene detected at 13 mglkg at a depth of 30 feet in boring TH-4, <br /> which was positioned 15 feet west of the west side of the former 5,000 gallon unleaded <br /> gasoline tank However TPPH as gasoline was detected at a concentration of only 5 85 <br /> mg/kg in this sample, and the concentration of benzene at a depth of 20 feet was only <br /> 0 021 mg/kg, and 0 052 mg/kg at a depth of 40 feet in this boring This indicates a <br /> ' very limited volume of impacted soil in the vicinity of the 30 foot sample <br /> ' Laboratory analysis of soil samples from the two vertical assessing borings detected <br /> total lead at what appears to be a background concentration of 19 to 20 mg/kg <br /> ' Soluble lead was analyzed tar in these samples and none was detected Therefore, no <br /> lead impacted soil has been observed Based on the field information and analytical <br /> data, it appears that if remediation measures are undertaken, they would involve less <br /> ' than 300 cubic yards of soil in the area of the former 5,000 gallon unleaded gasoline <br /> tank, less than 200 cubic yards of soil in the area of the product pipeline associated <br /> with the northern gasoline dispensers <br /> ' EB-8101-3 9210-EO55 RPT <br />