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_ k <br /> occurred in the 7 to 8-1/2 foot depth sample from U-C. The certified analytical reports <br /> ' indicate that the TPH-diesel concentrations observed may represent mixtures of ether <br /> hydrocarbons with chromatograph retention times similar to that of the diesel standard. <br /> In general, hydrocarbon concentrations appear to attenuate with depth, and are very <br /> low (less than 21 ppm) below 15 feet. Generalized Geologic Cross Secdoas A-A' <br /> tom' and B-B' (Figures 3 and 4) indicate the spatial distribution of TPH-gasoline and TPH- <br /> i.i diesel coucentrations in the soils underlying the site. Certified Analytical Reports are <br /> y <br /> included in Appendix B. a <br /> 4 ' 33 Groundwater Analytical Results <br /> Groundwater samples were collected from all project wells on May 23, 1991, and { <br /> = t <br /> I <br /> an for Tl?H-gasoline, TPH-diesel, and BTEX compounds (Table 3). IPH, <br /> gasoline'.co�icentiations.were highest in Well U-5 at 3,200 parts per,billioti(ppb). Wells <br /> U-2 and U-6 contained TPH-gasoline concentrations of 350 ppb and 240 ppb, <br /> respectively. TPH-diesel was detected in Wells U-4, U-5, and U-6, at respective f. , <br /> concentrations of 50 ppb, 180 ppb, and 280 ppb. These concentrations may represent <br /> z <br /> r compounds other than diesel,as discussed above and indicated in the laboratory reports <br /> in Appendix B. A Dissolved Hydrocarbon Concentration Map is presented as Figure 6. c <br /> 60 <br /> J <br /> t � t <br /> K r`� <br /> l _ 1 <br /> i <br /> l:.r <br /> t � <br /> 3100101/REPOR7= 5 September 30,1991 <br />