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existing monitoring wells. The pumps are constructed of Teflon and <br /> stainless steel and are attached to Teflon air and discharging tubing. <br /> The pumps will be certified by the manufacturer to be free of contami- <br /> nation. <br /> Because these wells are larger diameter (4 inches) , EMCON recommends <br /> that a Well Wizard pneumatic purge pump be installed in series with <br /> each sampling bladder pump. The extra pumps are necessary to allow <br /> efficient purging of standing water in the well prior to obtaining <br /> ground-water samples. These pump pairs were installed in 4-inch moni- <br /> toring wells at the nearby Harney Lane Sanitary Landfill and were <br /> found to be economical and efficient. <br /> After the pumps have been installed, the well will be surveyed to <br /> determine the ground surface elevation, top-of-casing elevation, and <br /> coordinates of each well . This will enable accurate determination of <br /> ground-water elevations and hydraulic gradients. <br /> An application for a drilling permit will be submitted to the San <br /> Joaquin County Local Health District with a detailed work schedule and <br /> map showing boring holes, depths, and locations. A valid permit will <br /> be obtained prior to beginning any drilling operations. <br /> PJ9 9390207.00D 13 <br />