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Average concentration = weighted volume � Actual Soil Volume <br /> Volume of petroleum + Volume of Soil) ,. <br /> = 3133.27 +16.58 <br /> { = 1.57 + 8292) <br /> = 189.0 ppm <br /> Vol. of petroleum = Volume of Soil x Concentration <br /> = 8292 x 189 ppm <br /> = 1.57 ft' <br /> 7.48 gallons = 1 fe <br /> = 11.7 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 of the highest concentration (6,000 ppm) and the 1,000 ppm concentration line. <br /> Section Volume Concentration Weighted Volume <br /> (ppm) Volume Petroleum <br /> Grids Cubic feet ft, <br /> K 31/2 1,750 1.2 4.2 0.0021 <br /> L 3 1,500 741.7 2,225 111 <br /> M 11 5,500 500 5,500 2.75 <br /> N 5 2,500 3,500 17,500 8.75 <br /> Total 221/2 11,250 1,121 25,229 12.61 <br /> Total Volume = 22.5 x 500 <br /> = 11,250 <br /> Average Concentration = 25,229 T 22.5 <br /> = 1121 ppm <br /> Volume Petroleum = 11250 x 1121ppm <br /> = 12.61 fe <br /> = 94.3 gallons petroleum hydrocarbons off site <br />