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1 <br />' In October 2000, approximately 236 6 metric tons of soil was excavated from the property and <br /> Stransported off-site for disposal Soil samples collected from the excavation contained TPH-G <br />' concentrations up to 730 ppm TPH-D analysis was not performed <br />' Following excavation activities, five monitoring wells were installed on the property Results of <br /> the initial groundwater samples collected from the wells encountered TPH-G and TPH-D <br />' concentrations up to 11,000 ppb and 2,900 ppb, respectively, with the groundwater gradient <br /> generally directed to the north The SJCEHD files only contained records of two groundwater <br /> monitoring events being performed at the property, with the last event in April 2001 (Advanced <br /> GeoEnvironmental, Inc , 2001b) <br /> Former Unocal Service Station <br /> The property, also identified as the Well Fargo Property in the EDR report, is located <br /> approximately 300 feet to the south of the site, and is listed in both the LUST and Cortese <br /> databases (Photograph 9) A hydrocarbon leak was reported from the USTs on the property, with <br /> the case subsequently closed by the SJCEHD <br /> lieAccording to SJCEHD records, the property was reportedly used as a service station from 1920 <br /> to 1962 (Gettler-Ryan, 2001 a) Records indicate that three 550-gallon USTs had been installed <br /> on the northern portion of the property Between 1938 and 1950, three USTs of 2,600-gallon, <br /> 4,000-gallon, and 6,000-gallon capacities were installed in the northwest portion of the property <br /> (Pacific Environmental Group, Inc , 1995) In addition, a waste oil UST was installed in the <br />' center of the property, adjacent to the service station building In a 1950 site map, the station had <br /> been remodeled and the three 550-gallon USTs were identified as abandoned <br /> In November 1996, two 550-gallon USTs were removed from the northern portion of the <br />' property and one 550-gallon UST abandoned in place These USTs were encountered during soil <br /> boring activities and may correspond to the USTs identified as being abandoned in the 1950 site <br />' map <br />' A total of eight groundwater-monitoring wells have been installed as part of the Unocal site <br /> investigation activities, with quarterly sampling events conducted from December 1995 through <br />' March 2001 Groundwater gradient has generally been directed to the north to northwest <br /> CNCi3104-28-031S[iARE\UST103-0027 doc 6 <br /> 1 <br />