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The value of the hydraulic conductivity determined by the <br /> slug test for MW-3 and MW-4 is 0.061 and 0.040 meter per day, <br /> respectively, with an average value of 0.051 meter per day <br /> (0.167 ft/day) . Assuming the aquifer thickness is 20 feet <br /> (6.1 meters) , the hydraulic conductivity (T = KB) of the <br /> aquifer can be estimated with the averaged transmissivity to <br /> be 0.311 meter per day. <br /> Hydraulic conductivity can also be used to calculate the <br /> average linear velocity at which a subsurface fluid moves <br /> " using Darcy's law. Darcy's law can be stated as follows: <br /> v <br /> where: v = Darcy velocity of water <br /> K = Hydraulic conductivity of aquifer material <br /> i = The.slope of the water table (gradient) <br /> The linear velocity of the ground water at the site can best <br /> be estimated by using the hydraulic conductivity value based <br /> on the slug test data. Assuming that the average hydraulic <br /> conductivity of the aquifer is 0.167 ft/day and an estimated <br /> hydraulic gradient of 0.005 foot per foot, the linear <br /> 4_ velocity at the site is 0.305 foot per year. <br /> 5.0 ANALYTICAL, METHODS <br /> Laboratory analyses were performed by Superior Analytical <br /> Laboratory, Inc. and Anametrix Inc, both of which are <br /> w California-certified laboratories. All soil and ground water <br /> analyses were performed using standard test methods of the <br /> ? U.S. Environmental Protection Agency (EPA) and the California <br /> Department of Health Services (Cal-DHS), as discussed below. <br /> 4 <br /> 5.1 AnaiypAm of Soil SaMpIgg <br /> The four soil samples collected from the additional soil <br /> borings were analyzed for total petroleum hydrocarbons as <br /> gasoline (TPH-G) using EPA Methods 5030 and $015 and benzene, <br /> toluene, ethylbenzene, and xylenes (HTEX) by EPA Methods 5030 <br /> and 8020. A summary of the results of the soil analyses is <br /> presented in Table 2. The official laboratory reports and <br /> chain of custody documents are included in Appendix G. <br /> .2 alialysis of Ground WateK Samgles <br /> - All ground water samples from the monitoring wells were <br /> analyzed for TPH-G by EPA Methods 5030 and 8015 and BTEX by <br /> EPA Methods 5030 and 602. A summary of the results of the <br /> J <br /> 12 <br />