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.�e2 Y special wrench to be opened. Ile wells are furzller secured with locking well caps And padlocks. The completion details of each well arc contained with dSc description of the soils In the drill logs anal tvs attarhed to this report as Appentlix A. 2.3 SAMPLING AND ANALYSIS OF SOILS As the soil borings were driilod,soils were sampled at five foot intervals with a tnodificsl Gslifornia split spoon sampler lined with three 2-Inch brass liners. -Ifie sampler and brass liners cue scrubbed with dcurgent and.Insed with tap Arai dcionizcd water before each a npling cvc,u. After collection of each sample,the exposed ends of one of the flux soil- filled brass liners were Immediately protected with Aluminum foil and tapped with plastic end caps;the plastic end caps were soled to the brass bncrs with plastic tape, The scaled S=plc was labelled and placed on ice for stn;age and(Ater trartspotta60n to the analytical lab. The rernWning soil-filled brass liners were emptied of their contents and seannod with an orgy vapor analyzer(llnerma Env4onntntal Instruments Model,,AOA OW equipped wide a photo-Ionization de:cctor). After being sea.rtncd with the OVM,the soil was descsibed according to the Unified Classifteltion►System And rebored on drill logs by the supervising geologist. All the soil samples that were collected wars submitted under chain-of-eustody to pace Labarawrics in Novato.California. face is rrsiificd by the Depasuncm of Health Sen lees Ha,;arr Ous Materiah to perform h=rdous and toxic waste analysis for metals and inorganic and organic parameters under onifneatc number 14B. Selected soil samples were a1Wyxcd for total petroleum hydrocarbons f I1E'fo'benzene. tolut=.ethylbenzcne,and xylenes(STEM according,to EPA method 9015. The results of these analyses are summarized In Table 3. The soil sample collected from 35 feet in MW 1 in the southwest comer of the site TIPM 6)did not contain detectable concentrations of petroleum hydrocarbons- The soil sa.-nples from MW2 in the southeast corner of the site,contained low levels of toluene(0.009 to 0.0039 mgft)and xylenes(0.0007 mg/kg). The highest concentrations of petrolerm hydrocarbons were detected in the soils of monitoring wellsP+�MW4;bode wells tett:close to the backf&d,tank extAVA n. 'The c0=ntrMdW$of pertmIcum hydrocarbons m&ch a maximum of 3,300 mgllog TPH with 9.6 mg/kg benzene.210 mg/kg toluene,Sft _..__ ILcthlbet=e.and 240 m&lk.-xylenes at.31._feet below.Voundmdam In MWS. This It S feet atbovc ru-n encouracred ground wmcr reed less than S fest above the stares ---- ---— ----- - water tabic. t onc�crttraft dons of petroleum hydsvcasboas In tete sails decline away limit bxkli W excavation in 61W5 and I► W6,low levels of bet n=(O.OM utd O.Op31 S �„ -- "