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Work Plan for Environmental Investigation June 21, 1989 <br /> Waterfront Redevelopment, Stockton, California AGS 39048-1W <br /> Monitoring Well Construction <br /> Monitoring wells will be constructed in the borings using <br /> 2-inch-inner-diameter, thread-jointed, Schedule 40 polyvinyl <br /> chloride (PVC) casing. No chemical cements, glues, or solvents <br /> will be used in well construction. The slotted portion of each <br /> well will consist of factory-perforated casing with 0. 020-inch- <br /> wide slots. The well screen will extend from total depth of the <br /> well to a point approximately 5 feet above first encountered <br /> ground water. This interval will allow sampling of water near <br /> the air-water interface in the wells, which is representative of <br /> the water in the formation during seasonal fluctuations of the <br /> ground-water level. The annular space in the well will be packed <br /> from the bottom with sorted sand until it is approximately 2 feet <br /> above the slotted interval. A 3-foot-thick plug of bentonite �! <br /> pellets will be placed above the sand pack to keep out cement. <br /> The remaining annulus will be backfilled with a slurry of cement% <br /> water, and bentonite powder to grade. <br /> Monitoring wells will be protected with cast-aluminum utility <br /> boxes equipped with PVC skirts. These utility boxes will be <br /> installed flush with the surface grade. These boxes have <br /> watertight seals to protect against surface-water infiltration <br /> c <br /> Applied GeoSystems <br />