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S • II 1 August 21, 1989 JOE t,ELL - TRACY, CALIFORNIA Job Rama: on July field observations,believed to information and the area helsee plate on the above four soil borings in a tanks. Based up TECC drilled underground storage s were 18, 1989, The borings on containedt�ee soils borings• These are have formerly equipment. borings for the locations augexing Efforts to drill the using hand and B- p ad were unsu_ drilled as B-1� B_2� B-3, a concrete p continually plate 1 beneath the grave prevented revented h the materials eared to c pea g sloughing p to be through that app The continual umed the These materials,the Bore-hole• h these materials (ass int a sloughed intoe of borings through in turn drilled excavation Teti The boring were former tan]G the comp erimeter of the materials backfill materials) the p The soil of clays is around materials) • consist primarily soil materials backfill appeared to (and the in the borings (anountere in that appeared tO encand silty soil materials free ground water terminated into the soil/ the werejevea near encountered in sheveryborimois . and bemoistawet soils were rade. Upon t plow surface g be The very eight-feet b- a soils Interface- s into these materials or.ing• t approximately end of each b each borings a boring from thecompletion of the from the terminal Collected a clean, collected soil samples were and sample was ed hand sampler undisturbed gPlatively undisturbed a E;odifJ driven into the d using a Californi sampler was Between borings an boring The slide hammer• equipment was brass sample liner• ound and sampling Tsp) soapy s using a ten-p augerin9 phosphate material the tri-sodium samplings' Solution of the soil with a water water• ht and one Cleaned with clean tap eig and then rinsed roximatelY were at app samples of the water dwater was enbelowc rade• No gree group nine-feet below g half-feet to collected. 2 3t .I