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. 24 March 2000 <br /> AGE-NC Project No 97-0141 <br /> Page 7 of 9 <br /> washed #2/12 Lonestar sand will be added from the bottom of the borehole to approximately two <br /> feet 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 <br /> An nominal two-foot thick bentonite seal will be placed above the filter pack to 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 annular space between the auger and the well casing and allowing <br /> them to settle on the filter pack Bentonite chips will be hydrated using five gallons of water The <br /> bentonite chips will be allowed to hydrate for a minimum of one-half hour prior to grouting <br /> The remaining annular space above the bentonite seal will be filled to within one foot of the ground <br /> surface with a cement grout The grout mixture will consist of Type 1/11 portland neat cement and <br /> not more than 6 gallons of water per 94-pound sack of cement The grout will be placed by pumping <br /> through tremmie pipe The PHS-EHD will be notified for grout inspection at least 72 hours prior to <br /> conducting grouting procedures <br /> Following completion of the monitoring wells, well elevations and locations will be surveyed by a <br /> California-licensed surveyor <br /> 43 WELL DEVELOPMENT <br /> Development will consist of a combination of bailing to remove the major portion of fine-grained <br /> sediment from inside the well, surging to flush out or draw in sediment from the filter pack, and <br /> additional bailing to firush the removal of sediment Development activities will be continued until <br /> field parameter (pH, electrical conductivity, and temperature) readings have stabilized <br /> 4 4 GROUNDWATER SAMPLING PROCEDURES <br /> Groundwater sample collection will be performed in accordance with the PHS-EHD's Recommended <br /> Groundwater Sampling Guidelines, dated 15 February 1995 <br /> 4 5 1 Static Water Level Measurements <br /> Before sampling and during groundwater monitoring, static water level will be measured using an <br /> electric water level indicator Water level data will be recorded to the nearest 0 01 foot from a <br /> reference point marked of the top of the PVC well casing Before and after each use, the <br /> i <br /> Advanced GeoEnvironmentat,Inc <br />