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Site Background Information Five Star Manna <br /> Page 2 of 3 <br /> 1 <br /> The UST was located in Lindsay Street, between the northern and southern blocks of buildings <br /> 1 Upon removal of the UST, holes were noted at the western end and in the bottom of the UST <br /> Hydrocarbon odors were not observed in soil above eleven feet below surface grade (bsg) <br /> Approximately five cubic yards of hydrocarbon-impacted soil were removed and stockpiled during <br /> the UST removal Soil samples were collected from two feet below the UST, at depths of twelve feet <br /> bsg The overburden soil was used to back fill the lowest portion of the excavation <br /> ' Analytical results of soil samples collected from the UST excavation indicated that an unauthorized <br /> release of hydrocarbons had occurred at the western edge of the UST Total petroleum hydrocarbons <br /> quantified as gasoline were detected in sample T 1-W at 690 mg/kg Total petroleum hydrocarbons <br /> ' quantified as gasoline (TPH-g) was not detected in the soil sample collected from the eastern end <br /> of the UST <br /> PREVIOUS SITE INVESTIGATION <br /> ' On 14 November 1996 and 16 January 1997, a total of fifteen soil probe borings (P1 through P15) <br /> were advanced at the site under the supervision of the EHD Soil probe bonngs were advanced in <br /> the vicinity of the West UST area at the western edge of the site and in the vicinity of the on-site <br /> ' plating shop Locations of the soil probe borings are illustrated on Figure 2 <br /> Total petroleum hydrocarbons as gasoline(TPH-g),BTEX, and methyl tertiary butyl ether(MTBE) <br /> ' were detected in soil samples collected from the probe borings at concentrations as high as <br /> 3,700 mg/kg Hydrocarbon-impacted soil associated with the West UST area appeared to be of <br /> ' limited lateral extent TPH-g was detected in four of ten grab ground water samples collected from <br /> the West UST area at concentrations ranging from 84 to 44,000 µg/l (micrograms per liter or parts <br /> per billion ppb) Various BTEX compounds were detected in six of ten samples analyzed at <br /> concentrations ranging from 0 60 to 7,800 µg/1 <br /> Hydrocarbon-impacted soil in the vadose (unsaturated) zone, associated with the West UST area <br /> ' within San Jose Street,was limited to a narrow zone from depths of approximately 5 to 15 feet bsg <br /> immediately surrounding the UST The detection of MTBE in soil samples collected from probe <br /> boring P 1 indicated the release of gasoline to be relatively recent, possibly within the past twenty <br /> ' years <br /> Gasoline-impacted ground water is present around the West UST area The dissolved gasoline plume <br /> ' appears to extend to approximately 50 feet northeast and 50 feet southwest from the former West <br /> UST area, and has an approximate width of 40 feet <br /> Total petroleum hydrocarbons quantified as diesel(TPH-d) was detected at concentrations up to <br /> 6,600 µg/1 from four of five grab ground water samples analyzed from the western property <br /> Advanced Geo Environmental,Inc <br />