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i <br /> ISOM <br /> i, <br /> AnalysisnA pX <br /> Both the pump test and slug test data are presented in <br /> Appendix B. The results of the pump test were used to <br /> calculate the hydraulic conductivity parameters using both <br /> the Theis and Cooper-Jacob methods. The Theis method <br /> calculations were performed using a computer program <br /> developed by the International Ground Water Modeling Group <br /> (IGMG) ; results are presented in Appendix C. The <br /> Jacob-Cooper method of calculating aquifer parameters was <br /> done graphically, as shown in Figure 3 in Appendix C. The <br /> hydraulic conductivity of the aquifer, based on the slug test <br /> data, was also determined by the graphical method, as shown <br /> in Figures 4 and 5 in Appendix D. <br /> The value of the hydraulic conductivity determined by the <br /> slug test for MW-3 and MW-4 is 0.02 and 0.01 meters per day, <br /> respectively. The hydraulic conductivity determined by the <br /> slug test can be averaged to 0.015 meters per day. The <br /> transmissivity and storage coefficient for the aquifer using <br /> the Theis and Cooper--Jacob solutions are 44.2 m2/day and <br /> 1.01 X 10-4 m/m, and 39.8 m2/day and 1.07 X 10-4 m/m, <br /> �. respectively. Assuming an aquifer thickness of 20 feet <br /> (6.1 meters) , the hydraulic conductivity (T = KB) of the <br /> ,..,� aquifer can be estimated using the averaged transmissivity %o <br /> be 6.9 meters per day. <br /> Hydraulic conductivity can also be used to calculate the <br /> t average linear velocity at which a subsurface fluid moves <br /> using Darcy's law. Darcy's law can be stated as follows: <br /> where: v = Darcy velocity of water, <br /> K = hydraulic conductivity of aquifer material, and <br /> = the slope of the water table (gradient) . <br /> V The linear velocity of the ground water at the site can best <br /> "i be estimated by using the hydraulic conductivity value based <br /> on the pump test data. The offsite velocity should be <br /> calculated using the slug test hydraulic conductivity value. <br /> The hydraulic gradient at the site was measured previously to <br /> be 0.001 foot/font. A review of the regional hydrogeology of <br /> the area also indicated the gradient to be approximately <br /> 0.001 foot/foot. Based on these values, the onsite and <br /> offsite linear velocities were calculated to be 6.9 X 10-3 <br /> s. and 1.5 X 10-5 meters per day. At this rate, it would take a <br /> 10 <br />