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-� Bear Creek.Winery ASE• • Lodi. San Joaquin Co. Monitoring Well lwtallation Proposal Health anti&1&tv Plan Upon arrival at the site, each member of the drilling team will be given a local map on which the route to Lodi Memorial Hospital is clearly marked The route will also be described verbally to each person. A cell telephone will be present at the drilling site for the duration of activities there. B. Drilling Details Hollow-flight augers(nominal 10"OD, 4 7/8"Ill) will be used to drill. Logging will be accomplished from continuous cores taken through the interior of the augers. The expected total depth is 40 to 50 feet. C. Monitoring WeU Design The proposed design of the wells is shown on Figure 2. The screened intervals of the wells will cover the first saturated interval. They will not begin less than 10 feet beneath the existing ground surface. They will not bridge two apparently separate hydrologic units. They will be long enough so that they we can reasonably expect them to intersect water even during low water table conditions. During high water table conditions, the water table is likely to be higher than the top of the perforated interval. The sand pack and screen size will be as shown on the figure(0.020" slots, Number 3 sand) if the water-bearing stratum targeted is medium sand or coarser. If the screen needs to be placed in fine or silty sand, 0.010" slots will be used. 'Threaded casing will be used throughout. Bentonite added to the grout mix will be at least 3 percent by weight but less than 5 percent to assure the grout will not shrink excessively. Ah grout will he placed with a tremie pipe. D. Well Development Development of the wells will not occur until more than 24 hours after the grout has been placed. The wells will be developed by alternately swabbing and pumping with a 0.5 hp submersible pump. The procedure will continue until the turbidity of water delivered by the pump after three casing-volumes have been purged is less than 5 NTU The development water will be placed in the adjacent infiltration area. E. Surveying A licensed land surveyor will be hired to measure the elevations (to within 0.01 foot) of the tops of the plastic casings and to locate them (to within 1 foot)on a rational coordinate system G. Well Sampling The wells will be sampled for the first time at least 48 hours after completing the development. The wells will be purged of 3 casing volumes using a 24-volt submersible pump. The purge water wiil continuously pass through a measuring cell and the pH, EC, and Temperature will be recorded at intervals. The pump carries a disposable