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As the two locations are well covered by a building, asphalt and pavement, the actual mass <br /> loading spike, and, therefore, the contaminant impacts to groundwater will be lower than the <br /> fid values in Table 5 <br /> A.3 Sensitivity to Fraction Organic Carbon Content (fd <br /> Fraction Organic Carbon Content (fes) vanes with sedimentary facies According to the <br /> VLEACH Manual, the mean organic matter (om) for loamy sand is about 0 61%, and the <br /> organic content f,,, is therefore 0 35%. (fes — om/1 724, Dragun, 1988) The f,,c values are <br /> higher for sand (0 42%) and Iower for loam (0 30%) The f,,, values of the silty sand at the <br /> project locations fall between 0 30% and 044% We therefore examined the groundwater <br /> [[t loading to which f. was set to 0 30%, 0 35%, 0 40%, and 0 50% <br /> The results of the sensitivity analysis for f,,, are shown in Figures A-6 through A-9 They <br /> indicate that higher coefficient f,, will delay the appearance of contaminant spikes, and also <br /> reduce the absolute value of spikes. The average TPH content at Location I is 12,036 ppm, <br /> or 12% We used 0.35%, a more conservative fc value The f,,, values of the soil column at <br /> ' the two localities are probably higher than 0 35% Therefore, the maximum contaminant <br /> concentrations in the groundwater will likely occur later in time, and at lower levels than <br /> shown in Table 5. <br /> it <br /> Elt� <br /> 11` <br /> L�1 <br /> s <br /> 1, <br /> MZ/04-06-95/UST/95-0089 APP 2 <br /> d <br />