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ENGEO <br /> INCORPORATED <br /> • Away from locations where other agriculturally related features (e.g., irrigation lines, tail <br /> water collection points, etc.) may have localized interference on groundwater levels. <br /> Monitoring Well Installation and Development <br /> Prior to beginning drilling activities at the site, well permits will be obtained from the <br /> San Joaquin County Environmental Health Department and Underground Service Alert (USA) <br /> will be contacted for underground utility clearance. The well boreholes will be drilled to a depth <br /> of approximately 31 feet using 8'/4-inch-diameter hollow stem augers. Drilling will be <br /> performed by a licensed well drilling contractor under the supervision of a Professional <br /> Geologist. During drilling, the Geologist will sample and describe the aquifer materials in <br /> accordance with the Unified Soil Classification System. A copy of the field boring log form is <br /> included in Appendix A. Depth to first-encountered groundwater will be recorded on the log. <br /> The monitoring well will be constructed using a 2-inch-diameter Schedule 40 PVC casing with <br /> flush threaded couplings as shown in Figure 3. The lower 10 feet of casing will consist of <br /> 0.010-inch machine-slotted casing. A waterproof locking PVC cap will be used at the top of the <br /> casing. The borehole annulus will be backfilled with #2/16 clean silica sand to about one foot <br /> above the top of the screened interval. An approximate 6-inch-thick seal of bentonite chips will <br /> be placed on top of the sand filter pack. The remaining annular space will be backfilled with a <br /> cement grout. The well will be completed with an aboveground stovepipe-style, steel, locking <br /> protective cover with a 3-foot-square by 4-inch-thick concrete apron. Three to four steel bollards <br /> will be cemented into the ground surrounding the protective cover to help minimize damage to <br /> the well from farming equipment. <br /> Following completion of the installation activities, the top of the newly installed well casings <br /> will be surveyed by a licensed surveyor within a horizontal control of f 0.1 feet and a vertical <br /> control of 0.01 feet. <br /> 4943.4.640.01 <br /> April 17, 2007 4 <br />