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• ' IT CORPORATION Mr. J. Kelly Williamson Kayo Oil Company April 17, 1985 Page 2 Table 3 presents a simple model of the v lume of soil that is contami- nated at each five-foot level under the site. It presents a worst case volume for the amount of gasoline in the soil of 84 gallons. This does not include the volume of gasoline in thE soil between the 15- and and 35-foot levels, where we have no data. However, it does not appear likely that the total contamination coulc be more than 100 gallons of gasoline. The laboratory report showinc the BTX values used in the calculation is attached to this report. METHOD FOR TOTAL PRODUCT CALCULATIONS A simplistic calculation of a worst casE scenario to approximate the total volume of petroleum products in the soil at each of the sites was completed. The soils at each site were divided into zones five feet thick from the surface to the bottom of the borehole. Using the bore- hole data/LEL readings, the lateral extant of contamination in each five-foot thick zone was delineated and the "surface" area of this zone approximated. Since each layer is five feet thick, the volume of con- taminated soil for each layer was then calculated by multiplying the "surface area" by 5. The volumes of the individual levels were then summed, and the worst case volume of hydrocarbons present was calcula- ted. The total wet weight of the soil , assuming 12 percent moisture content, and then the total dry weight in kilograms was calculated. The highest hydrocarbon concentration (sum of Xylene, benzene and toluene) for each site was used to calculate the amount of g soline in the ground. Assum- ing a specific weight of approximately 0.8 g/cc for the hydrocarbons and 998.6 kgm/cubic meter for water at 500F. , the volume of gasoline in the soil was calculated. The calculations are recapped below: (TOTAL VOLUME OF DRY SOIL)*(125 LBS. PER CUBIC FOOT)= TOTAL UNIT WEIGHT i (TOTAL UNIT WT) (0.454 kgm/lbs)(1 1.12-soil moisture 12%) TOTAL DRY WEIGHT SOIL (TOTAL DRY WEIGHT SOIL) (TOTAL H OROCARBONS IN ppm) _ TOTAL HYDROCARBONS in mass t (TOTAL HYDROCARBONS IN MASS)/(O. *998.6) _ TOTAL HYDROCARBON VOLUME in cubi meters CONVERT CUBIC METERS TO LITERS OF HYDROCARBONS (TOTAL HYDROCARBONS in liters) (1 3.78)= i TOTAL HYDROCARBONS in gallons In addition, calculations were completec and are shown in graphical form, Plate 1, which shows the sensitivity of the final hydrocarbon