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Evaluation of Hydrocarbons May 17, 1990 <br /> Waterfront Redevelopment, Stockton, California AGS 39048-2W <br /> the ground-water level. The annular space in the well will be packed from the bottom with <br /> sorted sand until it is approximately 2 feet above the slotted interval. A 3-foot-thick plug <br /> of bentonite pellets will be placed above the sand pack to keep out cement. The remaining <br /> annulus will be backfilled with a slurry of cement, water, and bentonite powder to grade. <br /> Monitoring wells will be protected with cast-aluminum utility boxes equipped with PVC <br /> skirts. These utility boxes will be installed flush with the surface grade. These boxes have <br /> watertight seals to protect against surface-water infiltration and must be opened with a <br /> special wrench. This design discourages vandalism and reduces the possibility of accidental <br /> disturbance of the well. <br /> Ground-Water Sampling <br /> Water samples will be collected for subjective analysis before developing and purging <br /> monitoring wells. A sample will be collected from the ground-water surface in each well <br /> with a Teflon bailer cleaned with Alconox and deionized water. Any subjective evidence <br /> of product detected in the well will be recorded. If no floating product is detected, the <br /> wells will be developed and purged, and ground-water samples will be collected for <br /> laboratory analysis. <br /> 12 <br /> AP101100' GeoSystelns <br />