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J ' <br /> TABLE 3-1 <br /> Chemical Concentrations in Soil Samples Used in.Risk Analysis <br /> ,.; Yellow Freight System, Inc., Stockton, California <br /> All results in mg/kg (parts per million-ppm) <br /> Sample Depth in TPH as TPH as_ Ethy17 Total <br /> Number Feet Diesel (1) Gasoline (1) Benzene#" Toluene# benzene# Xylenes# <br /> TSB-3-1 35.5-36 1900 80 µ 0.05 0.22' 2.4 4k <br /> TSB-3-3 40-40.5 2400 88 0.05 0.31 2.8 5.3 <br /> TSB-3-5 44-44.5 3200 50 0.05 0.25 2.6 0.24 <br /> TSB-3-7 48-48.5 4400 95 0.05 0.3 1.8 1.5' <br /> TSB-4-1 35.5-36 3100 47 0.025 0.19 0.58 11 <br /> TSB-4-3 40-40.5 31000 670 0.68 2.1 16; 44 <br /> .' TSB-4-5 46-46.5 4900 43 : 0.025 0.16 0.64 0.9 <br /> TSB-4-7 52-52.5 4200 38. 0.025 0.1 0.27 0.13 <br /> Population z 8 8 8 8 , <br /> Mean _ 0.12 ..-. -0.45 3.39 ...7.13 <br /> Standard Deviation . ,,, 0.23 0.67. 5.19 15.01 <br /> Standard Error , ,x_ 10.08 0.24 1.84 5.31 <br /> Upper 95 % Confidence Limit r ;0.27 0.89 . 6.80 17.00 <br /> r <br /> Notes: <br /> (1) Total Petroleum Hydrocarbons as Diesel and as Gasoline using modified EPA Method 8015. <br /> j A # Benzene, toluene, ethylbenzene, total xylenes using EPA Method 8020'. <br /> Benzene was detected only in one sample, TSB-4=3, the other samples were nondetect. <br /> Concentrations in bold are the highest hit and were used in the Reasonable Maximum Scenario. <br /> Upper 95 % Confidence Limit was;used for average exposure scenarios. <br /> Sheet 1 of 1 <br />