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i <br /> Project No 58080-06-OIC <br /> August 31, 1994 <br />' ranging from 148 to 910 micrograms per liter (ug/L) Uriah reported that a high percentage <br /> of the reported TPHg concentrations was methyl-tert-butyl-ether (MTBE), "a gasoline additive <br />' that has come into prominence only recently many years after the underground storage tanks <br /> were removed from the 305 South Hutchins Avenue site " In addition, the following <br /> halogenated volatile organic compounds were reported for the water sample obtained from <br /> MW-1 in January 1993 cis-l,2-dichloroethene at 8 53 ug/L, 1,2-dichloroethane at 70 1 ug/L, <br /> and tetrachloroethene (PCE) at 12 2 ug/L Based on the reported MTBE concentrations and <br />' the reported fact that "30 feet of uncontaminated soil separate the contaminated intervals <br />' from groundwater," Uriah concluded that the reported groundwater impacts likely resulted <br /> from an offsite source A summary of the groundwater sample laboratory test results reported <br /> r <br /> by Uriah is presented on Table II <br /> 1 <br /> Uriah submitted an application in September 1992 to the San Joaquin Valley Unified Air <br /> iPollution Control District for authority to construct a soil vapor extraction system at the site <br /> Uriah reported a maximum TPHg concentration of 11,000 mg/Kg at a depth of 25 feet bgs <br /> in boring EB-11 The volume of soil impacts, as estimated by Uriah, was reported to be <br />' approximately 35 feet x 35 feet in plan area x 20 feet thick, or 24,500 cubic feet <br /> - 18 - <br /> r <br />