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13 October 2006 <br /> AGE-NC Project No. 04-1207 <br /> Page 4 of 4 <br /> A nominal 2-foot bentonite chip seal will be placed above the filter pack to minimize the potential <br /> for grout penetration into the screened section of the wells. The bentonite seal will be formed by <br /> pouring bentonite chips into the annulus and allowing them to settle on the filter pack.The bentonite <br /> chips will be allowed to hydrate for a minimum of hour prior to grouting. <br /> The remaining annular space will be filled to within 1 foot of the ground surface with a cement <br /> grout. The grout mixture will consist of Type I/II portland neat cement and not more than 6 gallons <br /> of water per 94-pound sack of cement. The grout will be placed by pumping through a tremie pipe. <br /> A grouting inspection will be scheduled with EHD personnel. A proposed monitoring well <br /> construction diagram is depicted on Figure 3. <br /> Following completion of the monitoring well, its elevation and location will be surveyed by a <br /> California-licensed surveyor relative to a City of Lodi elevation benchmark. <br /> 3.3. WELL DEVELOPMENT <br /> Development of the proposed well will consist of a combination of bailing with a stainless steel <br /> bailer to remove the major portion of fine-grained sediment from inside the well, surging to flush <br /> out or draw in sediment from the filter pack,and additional ground water evacuation with a Waterra <br /> inertia pump to finish the removal of fine-grained sediment. Developmental purging activities will <br /> be continued until field parameters(pH,electrical conductivity,and temperature)have stabilized and <br /> purged water is visually sediment-free. <br /> 3.4. GROUNDWATER SAMPLING PROCEDURES <br /> Ground water monitoring and sampling will be conducted as detailed in the AGE-prepared <br /> Monitoring Well Installation Work Plan, dated 08 March 2005. <br /> 3.5. EQUIPMENT DECONTAMINATION/WASTE MANAGEMENT <br /> All sampling tools used for sample collection will be thoroughly rinsed with clean water after being <br /> washed with a solution of Alconox. Cuttings and rinseate generated during drilling activities will be <br /> containerized in properly labeled,Department of Transportation(DOT)-approved 55-gallon drums <br /> and stored on-site. Disposal alternatives will be evaluated based on the results of soil analysis. <br /> Advanced GeoEnvironmental,Inc. <br />