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�. �x� ;"� � _•.kir,� r � s�� '� � wryr �'�' n i �' � g�' • ��` <br /> M1 <br /> i <br /> Y � z <br /> Sg I�Q <br /> Laboratory analysis of soils revealed total hydrocart=s <br /> concentrations of 230 parts per million (ppm) in goring 5-1 (39-40.5 <br /> feet), 47 ppm in Boring S-2 (39-40.5 feet), and 7 ppm 1n Boring S-A <br /> ( It?.5-20 feet). No total hydrocarbons were detected in soil obtained <br /> from Boring S-B (9-10.5 feet). Soli obtained Frem the fill box <br /> contained 4,740 ppm total hydrocarbons. <br /> Pr_piLn_dj <br /> _Ajar <br /> Weil S-1 is licated at the downgradient (northwest) edge of the tank <br /> complex. The ground-water sample obtained from Well 5-1 contained <br /> 1 ,700 parts per billion (ppb) benzene, 2,400 ppb toluene, and 1 ,700 <br /> ppb xylene. Well S-2, located at the upgradient (south) edge of the <br /> tank complex, contained 150 ppb benzene, 820 ppb toluene, and <br /> 1 ,400 ppb xylenes. <br /> 4 <br /> t <br /> d <br /> [,�iaiity A sur n ./Qualitv,Control 5arroles <br /> A number of additional samples were collected and analyzed in <br /> fulfillment of QA/QC procedures required by Shell Oil Compsny. The <br /> results are discussed below. <br /> I <br /> Duplicate soil samples from Boring S-2 (39-40.S feet) were analyzed; <br /> total hydrocarbons Treasured 30 ppm and 47 ppm. These values are <br /> comparable, allowing For 3011 inhomogeneity. Duplicate water samples <br /> were also taken from Well S-I, and the results were found to be <br /> nearly Identical. <br /> BTM compounds were not detected in the field blank and trip blank <br /> water samples. The pump cleaning blank did contain 1.0 ppb toluene <br /> and 0.5 ppb xylenes; it was taken after sampling Well S-2 ( the last <br /> well sampled), which contained relatively high concentrations of BTx <br /> compounds. <br /> BTX compounds were not detected in the organic-free water used as the <br /> final rinse on the split-spOon sampler (rinsate). <br /> CONCLUSIONS <br /> Based on the results of this investigation, the following conclusions <br /> have been reached: <br /> Ground water occurs a+ the site under unconfined to seniconfined <br /> conditions. with stabilized water levels at a depth of <br /> r _ approximately--3-B.-5--fe.e .- <br /> -tbelow-grade.----The-groundwater-flow — - — - - — -- -- <br /> 1 direction is estimated to be to the northwest, based an regions! <br /> s f low, <br /> ? 100-13.01 <br /> t Pen 4 <br />