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'16 <br /> Pilot Testing Report and Conceptual Corrective Action Plan July 15, 1994 <br /> Manna Pro, 4004 South EI Dorado, Stockton, CA 16 <br /> The distance to the capture zone stagnation point around a single groundwater recovery well <br /> pumping at 1 3 gpm was calculated to be approximately 101 feet, using the Keely relationships <br /> ' discussed in Appendix E This calculation includes the maximum hydraulic gradient measured In the <br /> property vicinity on February 3, 1993, of 0 004 ft/ft, the groundwater pumping average rate of 1 3 <br /> ' gpm, and the average hydraulic conductivity of 74 gpd/ft2 Maximum width of the inflow zone, as <br /> defined by Keely, is approximately 635 feet <br /> fThe relatively large calculated steady state groundwater capture zone is caused by the relatively flat <br /> hydraulic gradient (0 004 ft/ft) and relatively low transmissivity value (738 gpd/ft) This implies that <br /> very few groundwater recovery wells will be necessary for hydraulic control of the Manna Pro <br /> property <br /> The actual drawdown that was measured and recorded duringthe aquifer test was lotted on the <br /> q p <br /> site plan and contours were drawn The data shows that the water table elevation was influenced at <br /> a maximum observed distance of 99 feet in response to groundwater pumping at EW-1 <br /> 52 Combined Groundwater Pumping and High-Vacuum Extraction Test <br /> A combined groundwater extraction and high-vacuum extraction (HVE) test was performed to meet <br /> the following objectives <br />' <br /> Quantify aquifer and vadose zone response to combined groundwater extraction <br /> and HVE, <br /> • Evaluate the feasibility of combined groundwater extraction and HVE as a remedial <br /> technology for the site, and <br /> • Develop a conceptual full-scale remedial system based on the combined <br /> groundwater pumping and HVE test <br /> 5 2 1 Methodology <br /> The combined groundwater extraction and HVE test was designed to depress the groundwater table <br /> using a submersible groundwater pump and extract soil vapor from the vadose zone using a <br /> liquid-ring pump A liquid-ring pump can produce maximum vacuum of between 15 to 23 inches of <br />' mercury ("Hg) During the test, groundwater was pumped at a constant rate and the vacuum <br />' 2819R034 070 LIM <br /> GROUNDWATER <br /> TECHNOLOGY, INC <br />