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NOR — <br /> RM. TME <br /> - <br /> " x,;-w- '` ", <br /> E <br /> I. H. KLE1NE=ELDER &ASSOCIATES <br /> ' linearly over depth while the volume of gasoline decreases rapidly between <br /> ^44. 16 and 21 feet and gradually between 21 and 31 <br /> _ feet. <br /> The vertical distribution of hydrocarbons appears to be influenced by soil <br /> type and lithology. The largest volume of hydrocarbons is present in the <br /> 13.5-18.5 foot range which is a silty sand, sandy silt type of soil. <br /> Below this is a silt layer. The reduction in volume and concentration of <br /> hydrocarbon indicates vertical migration of the hydrocarbon was retarded <br /> f <br /> by the silt. <br /> ttt <br /> t Possibly up to two additional <br /> point sources for the fuel leak are <br /> indicated by the data and pipeline leaks are suspected. The additional <br /> source area appears to lie within the area bordered by borings B-6, B-8 <br /> and B—?. <br /> Tlie water quality data show <br /> �,� ground water has beeh.: affected by.leakage froom' <br /> -m--thei tanks. n The highest concentration of hydrocarbons and its aromatic <br /> constituents was found in MW-1. This well is.located northeast a <br /> adjacent to a suspected source of leakage. Higher contamination likes;• <br /> exists below the northern and northeast areas of the "Shed and Service <br /> Pit" with a resulting plume of contaminated ground water extending cut <br /> below the- shed and migrating toward the southeast. Additional wells <br /> !.� upgradient and downgradient of the area are need6d to locate the leading <br /> edge and extent of ground water contamination. <br /> 5.4 PRELIMINARY SCREENING of FEASIBLE REMEDIAL ALTERNATIVES <br /> The data suggest the most feasible alternatives involve removal of the <br /> tv <br /> soil. The removal extent and subsequent disposition of the soil would <br /> Iti require further analysis. Preliminarily, alternatives could include. <br /> � <br /> _ f <br /> fir <br /> 38-87-43 15 <br /> 6. <br />