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IT CORPORATION <br /> Mr. J. Kelly Williamson <br /> Kayo oil Company <br /> April 17, 1985 <br /> Page 2 <br /> The water table at the station is at a level of 47 feet below ground <br /> surface. On the basis of the depth of ground water and the declining <br /> LEL values with depth, it does not appear likely that ground water is <br /> contaminated yet. <br /> The pattern of contamination indicates that the source of the hydro- <br /> carbons is in the area of the tanks and that the hydrocarbons moved <br /> essentially downward with minor lateral spreading to the west. <br /> Table 1 indicates the volume of soil that is contaminated at each five- <br /> foot level under the site and presents a worst case volume for the <br /> amount of gasoline in the soil of 197 gallons. The volume of contami- <br /> nated soil is approximately 1,065 cubic yards, ignoring the volume of <br /> the tanks. The laboratory report for the soils samples is attached to <br />. this report. <br /> SUMMARY OF TOTAL PRODUCT CALCULATIONS <br /> A calculation of a worst case scenario to approximate the total volume <br /> of petroleum products in the soil at each of the sites was completed. <br /> The soils at each site were divided into levels five feet thick, from <br /> the surface to the bottom of the borehole. Using the borehole data/LEL <br /> readings, zones with contamination in each five-foot thick layer were <br /> delineated and the "surface" area of this zone approximated. Since each <br /> layer is five feet thick, the volume of contaminated soil for each layer <br /> was then calculated by multiplying the "surface area" by 5. The volumes <br /> of the individual levels were then summed, and the worst case volume of <br /> hydrocarbons present was calculated. <br />