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i <br /> I cubic yard '= 1.3 tons <br /> = 2600 pounds <br /> Weight of Petroleum (per section) = Weight of Soil x Concentration <br /> 1 gallon gasoline = 6.68 pounds <br /> Average concentration = Pounds of Hydrocarbons _ Total Weight (Soil) <br /> = 75.37 T 399,244 <br /> = 188.8 ppm <br /> 11.29 gallons petroleum hydrocarbons on site <br /> Off Site Impacted Soil <br /> The same methods were used to calculate the volume of petroleum hydrocarbons off site. <br /> Fewer data points were available. Section M was calculated using the area between the limit <br /> of contamination and the 1,000 ppm concentration line. An average concentration of 500 <br /> ppm was assumed. The average concentration of section N was assumed to be the average <br /> of the 1,000 ppm concentration line and slightly higher than the highest concentration (6,000 <br /> ppm). <br /> Section Volume Weight Concentration Pounds Gallons <br /> (Grids) Tons Pounds (ppm) Petroleum Petroleum <br /> K 31/2 32.41 84,259 1.2 0.10 0.015 <br /> L 3 27.78 72,222 741.7 53.57 8.02 <br /> M 11 101.9 264,815 500 132.4 19.83 <br /> N 5 46.30 120,370 4,000 481.5 72.12 <br /> Total 221/2 208.3 541,667 1,121 667.6 100.0 <br /> Total Volume = 22.5 x 250 <br /> = 5625 fe <br /> = 208 cubic yards <br /> Average Concentration = 667.4 541,667 <br /> = 1232 ppm <br /> 100.0 gallons petroleum hydrocarbons off site <br /> l� <br />