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lahprator } arsalysxs of soils revealed low hydrocarbons concentrations <br /> for :ampies collected from lOF jJ es con S-B and S-C in B parts per <br /> ` c;f 14 to 15.5 feet. [hese samples contained 3 ec B <br /> (pPw) total hydrocarbons. [tie soil sample collected from Boring 5-A <br /> to the 14- 15.5 foot depth interval contained 260 Ppm total <br /> hydrocarbons. Soil obtained from the: fill bax contained a relatively <br /> hr�7h ,.orreritration of 44,0[10 pPm total hydrocarbons. <br /> Cirnurui plater <br /> ticll S-1 15 located on the downgradient (west) side of the tank <br /> complex. The groundwater sample obtained from this Well contained <br /> relatively high BTX concentrations of 11 ,000per 'aillion (ppb) <br /> benzene. ?0,000 ppb toluene,and 1B4O00 PP0xylenes. <br /> i�uality Assurance NualitY Conmples <br /> trol Sa <br /> A number of additional saTples were collected and analyzed in <br /> fulfillment of QR/QC procedures required by Shell oil Company. The <br /> result are discussed below. <br /> Duplicate soil samples from Boring S-A ( 14-15.5hfe eet) were values anaanalyzed, <br /> total hydrocarbons measured 6 ppm and 3 PP <br /> were taken fromoUell Spl ,soil and thenmoqonei <br /> resultstwere6foundato bete tnearlypr pies <br /> were t <br /> identical. <br /> No BTX compounds were detected in the field blank and trip blank <br /> water samples. No pump blank water sample was analyzed for this site <br /> since only one well was sampled. <br /> No BTX compounds were detected in the organic-free water used as the <br /> final rinse on the split•-spoon sampler (rinsate). <br /> CONCLUSIONS <br /> 9ased on the results of this investigation, the following conclusions <br /> have been reached- <br /> Ground water occurs at the site under unconfined to semiconfined <br /> conditions, with stabilized water level at a depth of <br /> approximately 46.5 feet below grade. The ground-water flow <br /> direction is estimated to be to tha northwest, <br /> based a nlregional <br /> flow. However, local water supply wells <br /> ground-water gradient, as discussed in Appendix C. <br /> Page 4 <br /> !QO-12.01 <br />