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Site Background Information Five Star Marina <br /> Page 2 of 8 <br /> 1 <br /> UST Hydrocarbon odors were not observed in soil above 11 feet bsg Approximately 5 cubic yards <br /> ' ofhydrocarbon-impacted soil were removed and stockpiled during the UST excavation Soil samples <br /> were collected 2 feet below the UST, at depths of 12 feet bsg The overburden soil was used to <br /> backfill 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 (TPH-g) were detected in sample T 1-W at 690 mg/kg TPH-g was not <br /> detected in the soil sample collected from the eastern end of the UST <br /> ' PREVIOUS SITE INVESTIGATION <br /> tOn 14 November 1996 and 16 January 1997, a total of fifteen soil probe borings (P I 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 vicmity of the on-site <br /> ' plating shop Locations of the soil probe borings are illustrated on Figure 2 <br /> � . TPH-g,BTE,X,and methyl tertiary-butyl ether(MTBE)were detected 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 arca appeared to be of limited lateral extent TPH-g was detected in four of ten <br /> ' grab ground water samples collected from the West UST area at concentrations ranging from <br /> 84 micrograms per liter(pg/1)to 44,000µg/1 Various BTEX compounds were detected in six often <br /> Samples analyzed at concentrations ranging from 0 60 l.ig/l to 7,900 pg/l <br /> Hydrocarbon-impacted soil in the vadose (unsaturated) zone, associated with the West UST area <br /> within San Jose Strc,et, was limited to a narrow zone from depths of approximately 5 feet to 15 feet <br /> bsg immediately surrounding the UST The detection ofMTBE in boil samples collected from probe <br /> boring PI indicated the release of gasoline to be relatively rcLent, possibly within the past 20 years <br /> ' Gasoline-impactedgiound watc.ris presentaround the Wt-st UST area The dissolved gasoline plume <br /> appears to extend to approximately 50 feet northe&,t and 50 feat sout11WLs1 from the former West <br /> US F area, and has an approximate width of 40 feet <br /> ' Total petroleum hydrocaibon,, quantified as dteticl ('I PH-d) was deUUCCI at concentrations up to <br /> 6,600 gg/l from foul of five grab ground water samples analyzed from the western property <br /> ' boundary -1 he 4ubje.et propLrty has no docurnentLd List, Of I PH-Cl <br /> To dctcrM111c thL laLLral ctitt.nt oftlit h�dmLarbtnl impact to titan and ground witll <br /> tiic Wcst 11� 1 and the potcntial impact from ttic rc%aco facility to the tiub,Lct prop( riy additionA <br /> boil 1)robL horings were advanced at the site under the supervision of the EHD Hydrocaibon <br /> 1 <br /> 11l-M#_k J r1L�10 iti4(IC' 'V10 th' (1 10 1, iLllitt;' (it 01L U3111L, ink 'o( , <br /> 1 <br />