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19 March 1999 <br /> AGE-NC Project No. 98-0471 <br /> Page 10 of 12 <br /> feet to 15 feet bsg. <br /> The casing,filter pack and well sealing materials will be placed into the borehole through the interior <br /> of the hollow-stem augers. After installing the well casing, filter pack material consisting of pre- <br /> washed #2/12 Lonestar sand will be added from the bottom of the borehole to approximately one <br /> foot above the screened 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. A nominal (two- <br /> foot)bentonite seal will be placed above the filter pack to seal off the filter pack and minimize the <br /> potential of grout penetration into the screened section of the well. The bentonite seal will be formed <br /> by pouring bentonite chips into the annulus and allowing them to settle on the filter pack. Bentonite <br /> chips will be hydrated using five gallons of water. The bentonite chips will be allowed to hydrate <br /> for a minimum of one-half 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 <br /> 94-pound sack of cement. The grout will be placed by pumping through tremmie pipe. Grouting <br /> procedures will be inspected by PHS-EHD personnel. <br /> Following completion of the monitoring wells, well elevations and locations will be surveyed by a <br /> AGE personnel. <br /> 4.2.3. Well Development <br /> Development will consist of a combination of bailing to remove the major portion of fine-grained <br /> sediment from inside the wells, surging to flush out or draw in sediment from the filter pack, and <br /> additional bailing to finish the removal of sediment. Development activities will be continued until <br /> field parameter (pH, electrical conductivity, and temperature) readings have stabilized. <br /> 4.3. GROUNDWATER SAMPLING PROCEDURES <br /> Ground water sample collection will be performed in accordance with pertinent applicable sampling <br /> protocols, details of which are presented below. <br /> 4.3.1. Static Water Level Measurements <br /> Before sampling and during quarterly groundwater monitoring, static water level and free-product <br /> thickness (if present) will be measured using an electric oil/water level indicator. Water level data <br /> Advanced CeoEnvironmental,Inc. <br />