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27 February 2015 <br /> AGE-NC Project No. 96-0235 <br /> Page 9 of 10 <br /> installed from 40 feet to 60 feet bsg. A diagram of the proposed monitoring well <br /> construction is depicted in Figure 3. <br /> After installing the well casing in each pilot boring, a filter pack material consisting of <br /> Y pre-washed #3 Lonestar sand will be added through the augers from total depth to <br /> approximately 2 feet above the screened interval. Following placement of the filter pack, <br /> the well will be surged to assist in settling the filter pack. Additional sand will be added if <br /> settling occurs. f a M� �. <br /> )mss <br /> A three-foot bentonite seal will be placed above the filter pack to minimize the potential <br /> for grout penetration into the screeWed section of the wells. The bentonite seal will be <br /> formed by pouring bentonite pellets into the annulus and allowing them to settle on the <br /> filter pack. The bentonite pellets will be allowed to hydrate for the duration of time <br /> specified by the manufacture; prior to grouting. The remaining annular space will be <br /> filled to within one foot of the ground surface with a cement grout. The grout mixture will <br /> consist of Type 1/II Portland neat cement and not more than 3 gallons of water per,.0�-y�� l� <br /> pound sack of cement. The grout will be placed by pouring or pumping through a tremie <br /> pipe or auger. A grouting inspection will be scheduled with SJCEHD personnel prior to <br /> any application of grout. <br /> Following completion of the monitoring wells, each well location will be surveyed at the <br /> top of each well casing by a California-licensed surveyor relative to a City of Stockton <br /> - benchmark and the North American Vertical Datum 88. <br /> 4.3. WELL DEVELOPMENT <br /> Development of the proposed wells will consist of a combination of bailing with a <br /> stainless steel bailer to remove the major portion of fine-grained sediment from inside <br /> the well, surging to flush out or draw in sediment from the filter pack, and additional <br /> groundwater evacuation with a Waterra inertia pump to finish the removal of fine- <br /> grained sediment. Developmental purging activities will be continued until field <br /> parameters (pH, electrical conductivity, and temperature) have stabilized and purged <br /> water is visually sediment-free. <br /> 4.4. GROUNDWATER SAMPLING PROCEDURES <br /> Groundwater sample collection will be performed in accordance with AGE's standard <br /> monitoring and sampling procedures, which have been included as Appendix B. <br /> Advanced GeoEnvironmental Inc. <br />