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• • <br /> Work Plan For Remedial Approach and Well Installation 10 <br /> Ranch Market Site 23569 South Santa Fe Road,Riverbank,California May 2,2002 <br /> chloride (PVC) blank casing and 0.020-inch-slot well screen. The well screen will be installed <br /> from 13 feet bgs to 30 feet bgs (Table 1, Attachment 3). A sand filter pack will be placed <br /> within the annulus of the well from the bottom of the boring to approximately two feet above <br /> the top of the well screen. The annulus of the well will be sealed with two feet of bentonite on <br /> top of the sand, and a portland cement/bentonite slurry to the surface. A 10-inch-diameter, <br /> traffic-rated, watertight street box will be installed to protect the well from surface traffic. <br /> Each well will be developed by surging and bailing using a surge block and bailer to remove <br /> fine-grained sediments from the well and sand pack. Periodic measurements of pH, <br /> conductivity and temperature will be made during development to establish baseline values for <br /> groundwater. All water generated during the development activities will be stored in DOT <br /> approved 55-gallon drums pending disposal. <br /> After each wellhead is properly finished and set, the new wells will be professionally surveyed <br /> to establish horizontal position in relation to pertinent site features and elevation with respect to <br /> mean sea level. <br /> Ozone Sparge Wells <br /> Ozone sparge wells S-1 through 5-23 will be constructed of 1.25-inch diameter schedule 80 <br /> PVC blank casing and a 3-foot long sparging diffuser tip. The sparge tip will be installed from <br /> 35 to 38 feet bgs (Table 1, Attachment 3). A sand filter pack will be placed within the annulus <br /> of the well from the bottom of the boring to approximately two feet above the top of the well <br /> screen. The annulus of the well will be sealed with two feet of bentonite on top of the sand, and <br /> a portland cementlbentonite slurry to the surface. An 8-inch-diameter, traffic-rated, watertight <br /> street box will be installed to protect the well from surface traffic. <br /> Report Preparation <br /> A technical report summarizing the results of well installation, well development and soil <br /> sampling activities will be submitted to the RWQCB. <br /> Schedule of Events <br /> An estimated schedule to complete the proposed assessment is provided in Attachment 5. <br /> Fde:Reoch Mm t-Riscrbeek\W.r plmsV.h rtu '-RaM System <br />