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Site Background Information: Five Star Marina <br /> Page 2 of 4 <br /> Part I <br /> In May 1986, one 550-gallon gasoline underground storage tank (UST; West UST Area) was <br /> removed from the City of Stockton right-of-way in San Jose Street. Total volatile hydrocarbons <br /> (TVH) and volatile aromatics benzene, toluene, ethylbenzene, and xylenes (BTEX) were reported <br /> at concentrations as high as 2,000 mg/kg(milligrams per kilogram)in a single soil sample collected <br /> from the UST excavation (Table A l).Analytical results of soil samples collected from the UST <br /> excavation indicated that an unauthorized release of hydrocarbons had occurred at the western edge <br /> of the UST. Total petroleum hydrocarbons quantified as gasoline(TPH-g)were reported in sample <br /> T1-W at 690 mg/kg. TPH-g was not reported in the soil sample collected from the eastern end of the <br /> UST (Table Al). <br /> On 14 November 1996 and 16 January 1997,a total of fifteen soil probe borings(P 1 through P 15) <br /> were advanced at the site under the supervision of the EHD. Soil probe borings 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. <br /> TPH-g,BTEX,and methyl tertiary-butyl ether(MTBE)were reported in soil samples collected from <br /> the probe borings at concentrations as high as 3,700 mg/kg. Hydrocarbon-impacted soil associated <br /> with the West UST area appeared to be of limited lateral extent. TPH-g was reported in four of ten <br /> grab ground water samples collected from the West UST area at concentrations ranging from <br /> 84 micrograms per liter(µg/1)to 44,000 pg/1.Various BTEX compounds were reported in six of ten <br /> samples analyzed at concentrations ranging from 0.60 Vg/1 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 feet to 15 feet <br /> bsg 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 20 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 reported at concentrations up to <br /> 6,600 µg/1 from four of five grab ground water samples analyzed from the western property <br /> boundary. The subject property has no documented use of TPH-d. <br /> To determine the lateral extent of the hydrocarbon impact to soil and ground water associated with <br /> the West UST, and the potential impact from the Texaco facility to the subject property,additional <br /> soil probe borings were advanced at the site under the supervision of the EHD. Hydrocarbon- <br /> impacted water associated with the West UST was limited to vicinity of the former tank location, <br /> Advanced GeoEnvironmental,Inc. <br />