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FIELD PkOCEDURES <br /> Soil Borings <br /> Prior to drilling, Under$round Services Alert will'be contacted and.soil boring; permits will be <br /> obtained frorkhe San,Joaquin Environmental Health D.ivision.. A minimum.of six soil borings will <br /> be advanced to a depth of 30.fect:.using a drill-rig equipped with,a push=point sampling. device .:. <br /> One of the six'borings'wilhbe continuously sampled to:a depth of 30 feet, and then sampled:at five- <br /> foot maximum.intervals to the first encounter`of ground water,or 50 feet,whichever is encountered <br /> fiisC.. The soils encountgre.d in each boring.will be'logged by afield geologist using the Unified <br /> Soils-Classification System. Soil'samp: s will be.coflected from the borings at five400t rnaximum .' <br /> intervals beginning,at,a depth-of ten feet,using,plastic one-..inch diameter sampling tubes..; Samples <br /> will be screened in'the-field with-a photoionization:detector:to'estimate the extent of hydrocarbon <br /> contamination. The''samples ,tabes' will be but <br /> to. an appropriate length;. sealed., with <br /> polytetra#luoroethylene (P fFE}-coated sheets and plastic caps to.reduee volatile hydrocarbon loss,' <br /> ;preserved on, ice. and submitted with.chain-of-custody.documentation, to a California-certified <br /> = - laboratory, Sampling equipment will be decontaminated in the.field,bet,&een borings using'�eithcr'a <br /> solution of liquinox and water or a steam'cleaner. 'Rinseate from the decontaminatiwprocedure .- <br /> wrll be'contained and stored onsite in sealed and labeled.55 gallon drums <br /> Soil samples will be,selected from each.bonng and analyzed for Total;Petroleum Hydrocarbons <br /> (TPH) as gasoline using.modified BPA method 8015;and for:Benzene, Toluene,.Ethylbenzene;and <br /> Total Xylenes,(BT-BX), 'using EPA method'8020.' Soilgenerated'during drilling activities will be <br /> placed with.the existing stockpiled soils. <br /> Upon completion of,drilling and sampling,the soil borings will be sealed to'the.sutface by pumping <br /> a:slurry of cemea.and-bentonite,into each boring._. <br /> 805'North Liricoln,•_Suhe E Dixon,'California, '9.5620-2172 " <br /> Phbne. 916,678.4253.LFax 916.678.1988 ' <br />