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t' I 1 1-09-68 03: 5, CC OAKLAA'A P06/* r <br /> 8810197TWP CON-3 <br /> MW-5: north of the main plant at an up-gradient location near <br /> Industrial Park Drive, for baseline chemistry data; <br /> MW-6: in the 3-1/2-acre future expansion area east of the existing <br /> plant facilities. <br /> The monitoring wells will be installed chronologically in order of least <br /> suspected contamination to most suspected contamination (i .e. upgradient to <br /> downgradient). <br /> r <br /> The six soil borings, with depths below the static ground-water table, will <br /> be converted to permanent ground-water monitoring wells. The wells will be <br /> installed in conformance with San Joaquin County' s requirements and with <br /> permits from and inspections by the County's Local Health District. The <br /> materials used for the monitoring wells include: 2-inch I.D. , schedule 40 <br /> PVC piping (slotted and blank) , employing screw joints and friction fit <br /> caps (See Figure 2) . The case slotting is will be 0.010 inches. ' The sand <br /> pack backfill will be washed, kiln dried, Monterey No. 2- sand. The sand <br /> pack will be placed such that it will extend 1 foot above the top of the <br /> slotted casing interval . Above the sand pack will be an expansive <br /> bentonite pellet seal which will maintain a minimum 1 to 3-foot <br /> thickness. Above the bentonite seal , the annular space will be filled to <br /> the ground surface using a bentonite/cement grout. The grout mix will be <br /> composed of about 4% powdered bentonite and cement mixed with potable water <br /> at a rate of about 5.2 gallons/sack of cement. The bentonite/cement grout <br /> seal will be installed as a slurry. The bentonite pellets and <br /> cement/bentonite grout will be placed by tremie pipe or down the center of <br /> the hollow-stem auger depending on whether ground conditions can support <br /> encased holes above the water table. All monitoring wells will be fitted <br /> with locking, metal Christy boxes to ensure well integrity and support <br /> surface traffic. The wells will then be properly developed to maximize <br /> pumping capacities and to optimize the representativeness of ground-water <br /> samples. <br />