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- - <br /> sampling, MW1 and MW2 were also sampled on 19 July 1989. <br /> sample from MW2 contained The <br /> no detectable fuel constituents, and <br /> the sample from MW1 contained no detectable fuel constituents <br /> except for 0.0015 mg/L toluene. <br /> Copies of the analytical results are included as Appendix B. <br /> 4. 3 FINAL REMEDIAL PLAN <br /> f In pursuit of site closure, EA has resampled the soils <br /> ne <br /> the underground storage tank excavations at former ExxobeRsath <br /> 7-1050. Samples collected every five feet from the surface to <br /> the saturated zone document that only minor concentrations of <br /> i fuel cot�s.tituents are <br /> r J F present in the subsurface near the old <br /> product wanks. Borings SB6 and SB7 encountered soils which. <br /> y contained 0. 011 to 0. 034 mg/kg toluene and xylenes <br /> at. depths. of <br /> 30 to 45 feet. : TPH was detected in only one sample: 1 .6 mg/kg <br /> x at a 'depth of 30.5- feet in. SB7. '.No benzene. or ethylbenzene above <br /> the 0.005 mg/kg detection limit was found :in the borin . <br /> r' old product tank pits. gs 'nearthe } <br /> Soil samples collected from the boring near the ;waste oil it , <br /> contained no detectable fuel c p <br /> constituents, ai <br /> 1 lead. : Cadmium, chromium, and zinc values,arelwithinrtase, or <br /> _ concentrations normally' found. in <br /> clay-rich he range of { <br /> i <br /> ' y-rich sediments (USGS 197 # <br /> 6) . <br /> The groundwater beneath former Exxon RS. 7-1.050 i <br /> `i zene concentrations does contain ben- <br /> greater. than the maximum contaminant level. <br /> (MCL) specified 'by Title-;22, California-Administrative Code♦ <br /> rw� Groundwater with elevated benzene and other 'gasoline constituents <br /> is confined to the ort'' <br /> p ion of the aquifer intercepted by'.MW3 <br /> water samples from MW1 and' MW2 do not resent) contain <br /> ' trataans of fuel constituent presently <br /> concen- <br /> -�- <br /> greater than- method detection <br /> limits; water samples .from W4Nand MW contained onlyl <br /> ow levels <br /> of fuel' constituent in' the past. These wells effectively <br /> surround MW3 P <br /> and MW2 is ositione directly downgradient .from <br /> 1 e25/71050/8-89/txi; <br /> 77j'. <br /> 1 <br /> 31 <br /> - 3 <br /> nS <br /> WE <br /> t fi <br />