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r <br /> • Only fate and transport of dissolved phase contaminants are simulated (not <br /> appropriate for free product). <br /> Input Parameters <br /> Model Control Parameters: <br /> • Aquifer is "infinitely wide." <br /> s • Depth of aquifer is 24 feet. <br /> • "Instantaneous" release. <br /> • 100 year simulation time (maximum available). <br /> Reference is given to Section 1.4, Site Geology and Hydrogeology. Figures <br /> 3, 4, and 5 in Section 1.0 of this report present geologic cross-sections of the site <br /> based on boring data collected from the site. (Boring logs are presented in Appendix <br /> B.) Notice on Figures 4 and 5 that every boring which penetrates. a depth of <br /> approximately 24 feet (7.62 meters d surface <br /> } below ground (bgs) encounters what is <br /> described as a layer composed of clay or silty clay. Immediately above the clay layer <br /> is the sand aquifer which is approximately 10 feet (3.05 meters) thick. The <br /> underlying clay layer seems to be consistent across the site at a depth of <br /> approximately 24 feet bgs. Likewise, the clay layer is present at 24 feet bgs and the <br /> 10-foot thick sand aquifer is identified on the water well drillers report for the Louis <br /> Acosta well located nearby at 215 South Los Angeles Street. The Acosta well log <br /> is included as Attachment D-2 to this Appendix D. Based on information from all <br /> of these boring logs, the aquifer appears to be continuous in the lateral direction. <br /> �I <br /> Source Parameters: <br /> • Point source at x,y,z (0,0,0). <br /> • Instantaneous chemical release: Based on the highest concentration detected <br /> in any of the wells during fourth quarter 1995 monitoring, an approximated <br /> plume area ea o£ 319 square meters, and a thickness of 3.05 meters. The 319 <br /> square meters is determined by measuring the plume boundary shown on <br /> Figure 6 in Section 1.0 of this report and finding it to be approximately 26.2 <br /> meters (86 feet) by 12.2 meters (40 feet). This area of 319 square meters was <br /> then multiplied times the average thickness of the saturated sand layer shown <br /> b <br /> ` on Figures 4 and 5 in Section 1.0 0£ this report. The sand layer is <br /> La <br /> 96R7 D-2 East Bay Municipal Utility District <br /> 40429700.fer Final Closure Report <br /> I � <br /> fi <br /> 4 <br />