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Mr. J. Kelly William <br /> Kayo Oil Company <br /> April 17, 1985 IT CORPORATIOR <br /> Page 2 <br /> The pattern of contamination indicates that the source of the hydrocar- <br /> bons is in the area of the tanks and that the hydrocarbons moved essen- <br /> tially downward with only minor lateral spreading. <br /> Table 1 presents a simple model of the volume of soil that is contami- <br /> nated at each five-foot level under the site. The table also presents a <br /> worst case volume for the amount of gasoline in the soil of <br /> 258 gallons. The volume of contaminated soil is approximately 611 cubic <br /> yards, ignoring the volume of the tanks. <br /> METHOD FOR TOTAL PRODUCT CALCULATIONS <br /> A simplistic calculation of a worst case scenario to approximate the <br /> total volume of petroleum products in the soil at each of the sites was <br /> completed. The soils at each site were divided into zones five feet . <br /> thick, from the surface to the bottom of the borehole. Using the bore- <br /> hole data/LEL readings, the lateral extent of contamination in each <br /> five-foot thick zone was delineated and the "surface" area of this zone <br /> approximated. Since each layer is five feet thick, the volume of con- <br /> taminated soil for each layer was then calculated by multiplying the <br /> "surface area" by 5. The volumes of the individual levels were then <br /> summed, and the worst case volume of hydrocarbons present was calcula- <br /> ted. <br /> The total wet weight of the soil, assuming 12 percentmoisture content j <br /> and then the total dry weight in kilograms, was calculated. As indica- <br /> ted in the drilling reports, one sample adjacent to the sample where the <br /> highest field LEL reading occurred was sent to the laboratory for ben- <br /> zene, taleune, xylene (BTX) analysis. The analytical result showing the <br />