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f <br /> occurred in the 7 to 8-1/2 foot depth sample from U-C. The certified analytical reParts <br /> indicate that the TPH-diesel concentrations observed may represent mixtures of other <br /> hydrocarbons with chromatograph retention times similar to that of the diesel standard. <br /> CIAa. In general, hydrocarbon concentrations appear to attenuate with depth, and are very <br /> low (less than 21 ppm} below 15 feet. Generalized Geologic Cross Sections A-A' <br /> and B-B' (Fres 3 and 4) indicate the spatial distribution of TPH-pasoline and TPH- <br /> diesel concentrations in the soils underlying the site. Certified Analytical Reports are <br /> included in Appendix B. <br /> 33 Groundwater Analytical Results <br /> from all project wells on May 23, 1991, and <br /> Groundwater samples were collected <br /> - analyzed for TPH-gasoline, TPH-diesel, and BTEX compounds iTable 3). TPH- <br /> hest in Well U-5 at 3,200 parts per billion(ppb). Wells <br /> gasoline concentrations were highest band 240 b, <br /> ! U-2 and U-6 contained TPH-gasoline concentrations of 350 pp PP <br /> respectively. TPH-diesel was detected in Wells U-4, U-5, and U-6, at respective <br /> concentrations of 50 ppb, 180 ppb, and 280 ppb. These concentrations may represent <br /> colnpounds 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. <br /> 3 <br /> 1 <br /> 1 <br /> September 30,1991 <br /> 3100101/RF-PORT- <br />