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23 March 2000 <br /> AGE-NC Project No 96-0232 <br /> Page 7 of 8 <br /> 41 PILOT SOIL BORING <br /> One pilot soil boring will be advanced at the site to a maximum depth of 35 feet bsg utilizing a truck- <br /> mounted, hollow-stem drill ng and 10-inch diameter hollow-stem augers Cuttings generated during <br /> drilling activities will be placed on plastic sheeting and covered by plastic sheeting Rinseate will <br /> be containerized in properly labeled DOT-approved 55-gallon drums, and stored on-site in an area <br /> lacking public access Disposal alternatives will be evaluated based on results of soil and water <br /> analysis <br /> 42 WELL COMPLETION <br /> The 10-Inch diameter pilot boring will be single-completed as a ground water extraction well <br /> utilizing 6-Inch diameter schedule 40 polyvinylchlonde {PVC} 0 020-Inch slotted well screen and <br /> blank well casing A 25-foot length of well screen Is anticipated for Installation of the extraction <br /> well A proposed well construction diagram is depicted In Figure 3 <br /> After installing the well casing in each pilot boring, a filter pack material consisting of pre-washed <br /> #3 Lonestar sand will be added through the augers over the screen interval to approximately two feet <br /> above the screened Interval Following placement of the filter pack, the well will be surged to assist <br /> In settling the filter pack Additional sand will be added if settling occurs <br /> A nominal two-foot bentonite seal (pell plug-coded bentonite pellets) will be placed above the filter <br /> 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 pellets into the annulus and allowing them to <br /> settle on the filter pack The bentonite pellets will be allowed to hydrate for a minimum of one-half <br /> hour prior to grouting <br /> The remaining annular space will be filled to the ground surface with a cement grout The grout <br /> mixture will consist of Type I/II portland neat cement and not more than 6 gallons of water per 94- <br /> pound sack of cement The grout will be placed by pumping through tremmie pipe A grouting <br /> inspection will be scheduled with RWQCB/PHS-EHD personnel <br /> 43 WELL DEVELOPMENT <br /> Development of the proposed well will consist of a combination of bailing with a stainless steel <br /> bailer to remove the mayor 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 submersible pump to finish the removal of fine-grained sediment Developmental purging activities <br /> Advanced GeoEmironmental,Inc <br />