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05 July 2007 <br /> AGE-NC Project No.03-1100 <br /> Page 6 of 9 { V <br /> �� Zy � <br /> After installin thcell casing in each pilot boring, a filter pack material consisting of pre-washed <br /> #2112 Loriestargs ud be added through the augers over the screen interval to approximately two <br /> _reet-above �tTescreened interval. Following placement of the filter pack, the well will be surged to <br /> assist in settling the filter pack. Additional sand will be added if settling occurs. <br /> A nominal two-foot bentonite seal (pell plug non-coded bentonite pellets)will be placed above the <br /> filter pack to minimize the potential for grout penetration into the screened section of the well. The <br /> bentonite seal will be formed by pouring bentonite chips into the annulus and allowing them to settle <br /> on the filter pack. The bentonite pellets will be allowed to hydrate for a minimum of one-half hour <br /> prior to grouting. <br /> The remaining annular space will be filled within one foot ofthe ground surface with a cement grout. <br /> The grout mixture will consist of Type 1/1I portland neat cement and not more than 6 gallons of water <br /> per 94-pound sack of cement. The grout will be placed by pumping through tremmie pipe. A <br /> grouting inspection will be scheduled with EHD personnel. <br /> Following completion of the monitoring wells,well elevations and GPS locations will be surveyed <br /> by AGE personnel, relative to a City of Stockton elevation benchmark. <br /> 3.3. WELL DEVELOPMENT <br /> Development of the proposed wells 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(purging)with <br /> a Waterra bailing pump to finish the removal of fine-grained sediment. Developmental purging <br /> activities will be continued until field parameter (pH, electrical conductivity, and temperature) <br /> readings have stabilized and purged water is visually sediment-free. <br /> 3.4. GROUNDWATER SAMPLING PROCEDURES <br /> Ground water sample collection will be performed in accordance with the CVRWQCB guidelines <br /> and general industry standards. <br /> 3.4.1. Static Water Level Measurements <br /> Before purging and sampling during ground water monitoring events, static water level will be <br /> measured using an electric water level indicator.Water level data will be recorded to the nearest 0.01 <br /> Advanced GeoEnvironmental,Inc. <br />