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i <br /> MONITOR WELL CONSTRUCTION <br /> MOBIL SERVICE STATION #10-NP4 <br /> 2375 Tracy Blvd . <br /> Tracy , California <br /> MW-5 <br /> kell completed to 20 feet in depth with 4 -inch , Schedule 40 PVC <br /> casing , flush-threaded ,points . Screen ( 0 .020 inch slot ) set from <br /> 20 to 4 feet . Number 6x12 and 12x20 Monterey sand placed from 20 <br /> to 3 feet . Bentonite pellets placed from 3 to 2 . 5 feet . <br /> Concrete seal placed from 2 . 5 to 0 feet . <br />