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VLEACH also requires the following soil properties be know or <br /> estimated for the contaminate compound fate to be simulated. <br /> Bulk density = Dry weight of soil per unit volume, 1 .45 <br /> gm/cm3 (from sample SB15-30) . <br /> Porosity = Faction voids per unit volume .4 (from sample SB15- <br /> 30) . <br /> Volumetric water content = Fraction water per unit volume . 3 <br /> (from samples SB15-30) . <br /> Organic Carbon Content = Fraction organic carbon per unit <br /> mass 0 . 001 . <br /> Recharge rate = The amount of water recharging the area in <br /> one years time, usually precipitation (estimated at 1 . 1 <br /> feet per year) . <br /> Contaminate concentration in ground water, air, and <br /> recharging water. <br /> Profile of contaminate compound in soil . <br /> SITE <br /> • During February 1994, three conformation soil borings were <br /> drilled on this site . Hydrocarbons were found in all of the soil <br /> borings . These borings were converted to vapor extraction wells, <br /> VSB13 , VSB14, and VSB15 . <br /> Using the information obtained from the three soil borings and <br /> prior work done on the site, three soil polygons were developed <br /> centered on the above lasted soil borings, see Figure 1 . <br /> The surface area of each polygon is as follows : VSB13 , polygon <br /> 1, 110 ft,' , VSB14, polygon 2 , 140 ft2 ; and VSB15, polygon 3 , 120 <br /> ft2 . <br /> The concentrations for the following compounds : TFH (Gasoline) , <br /> Benzene, Toluene, Ethylbenzene and Xylenes were entered into <br /> different files and the model run on each file <br /> Gasoline is a variable mixture of hydrocarbon compounds . There <br /> are no set physical constants for gasoline In order to form <br /> some prediction on the fate of gasoline in the soil at was modeled <br /> as n-octane, which as consistant with latarature reviews <br /> regarding gasoline in soil fate modeling. <br />