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• Vertical dispersivity = 0.34 m (0.05 times longitudinal dispersiv- <br /> ity) <br /> S Bulk density of soil = 1.76 g/cm' (from sand/silt/clay standard <br /> of 110 .1b/ft3) <br /> • Fractional organic carbon <br /> 4� content = 0.01 g/g (conservative estimate) <br /> A Thickness of aquifer = 3.05 m (based on boring logs) <br /> { <br /> Chemical Parameters: <br /> Chemical 4rga tic Carbon Molecular D gradatit�n Rath. <br /> Bart tjon Diffusion Constant. <br /> Coe Icie ismC10� oefficirsii:ent (1/play) <br /> t <br /> Benzene 83 9.80E-06 9.63E-04 <br /> Toluene 300 8.60E-06 2.00E42 <br /> Ethylbenzene 11006.8OE`06 3.04E <br /> Xylene 240 7.80E-06 193E ► <br /> The entries for organic carbon partition coefficients and molecular diffusion <br /> l <br /> coefficients are defaultyalues of the model. The degradation rate constants were selected <br /> from the range of values for each BTEX constituent provided by Dr. Ashok Kaytal, a <br /> renowned modeling specialist from Draper Aden Environmental Modeling (Attachment D- <br /> 2). Each degradation constant was selected as the most conservative value (smallest K <br /> value) of the range of values provided. <br /> Receptor Well Data: (Refer to Figure 6 in Section 1.0 of this report.) <br /> 0 x-coordinate = 67 m (distance from MW-9 to property <br /> line along flow path) <br /> O y-coordinate = 0 m <br /> ® z-coordinate, top of screen = Om ' <br /> O z-coordinate, bottom of screen .= 3.05 m <br /> 96R7 -4 <br /> - East Say Municipal Utility District <br /> 40429700.fcr Final Closure Report <br /> C <br /> E <br />