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Revised Work Plan For Soil and Groundwater Assessment 10 Ranch Market 23569 South Santa Fe Road Riverbank California April 25,2000 60 feet bgs. After allowing the cement to cure,the neat cement plug in the bottom of the steel casing will be drilled out and the well deepened to a depth of 85 feet bgs using 8-inch-diameter hollow-stem augers. The well will be completed using a 2-inch diameter polyvinyl chloride (PVC)blank casing and 0.020-inch-slot well screen. The well screen will be installed from the 80 to 85 feet bgs. The annulus of the well will be sealed with 2-3 feet of bentonite on top of the sand, and a portland cement/bentonite slurry to the surface. Refer to Table 4 for specific well completion details. The well be secured and protected from surface traffic with a water-tight locking expansion cap and 8-inch-diameter, traffic-rated, watertight street box. Shallow Groundwater Monitoring Well Completion The monitoring wells will be constructed of 2-inch diameter polyvinyl chloride (PVC)blank casing and 0.020-inch-slot well screen(Figure 4). The well screen will be installed approximately ten feet above and ten feet below the water table. A sand filter pack will be placed within the annulus of the well from the bottom of the boring to approximately three feet above the top of the well screen. The annulus of the well will be sealed with 2-3 feet of bentonite on top of the sand, and a portland cementlbentonite slurry to the surface(Table 4). Each well be secured and protected from surface traffic with a water-tight locking expansion cap and 8-inch-diameter, traffic-rated,watertight street box or three-foot-tall stove pipe. Well Development Each monitoring well will be developed by surging and pumping to remove fine grained sediments from the well and sand pack. Periodic measurements of pH, conductivity and temperature will be made during development to establish baseline values for groundwater. All water generated during the development activities will be stored in DOT approved 55 gallon drums pending disposal. Well Surveying After each wellhead is properly finished and set,the new wells will be professionally surveyed to establish horizontal position in relation to pertinent Site features and elevation with respect to mean sea level. The location and elevation of the existing four groundwater monitoring wells(MW-1,MW-2, MW-3, and MW-4) and four domestic wells (DM-1, DM-2, DM-3, and DM-4)will also be included in the professional survey. Fkn--GeoPrabe&WcU.Lw