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i • <br />� M <br /> 18 December 2001 <br /> AGE-NC Project No 01-0839 <br /> Page 6 of 8 <br /> bentonite chips into the annular space between the auger and the well casing and allowing them to <br /> settle on the filter pack Bentonite chips will be hydrated using five gallons of water The bentonite <br /> 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 I/H 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 tremie pipe The PHS-EHD will be notified for grout Inspection at least 48 hours prior to <br /> conducting grouting procedures A typical monitoring well diagram is illustrated on Figure 5 <br /> IFollowing completion of the monitoring wells,well elevations and locations will be surveyed by a <br /> California-licensed surveyor <br /> 4 3 WELL DEVELOPMENT AND SURVEY <br /> Development will consist of a combination of balling to remove the mayor 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 finish the removal of sediment Development activities will be continued until <br /> field parameter(pH,electrical conductivity,and temperature)readings have stabilized Additionally, <br /> each well-head elevation will be surveyed by a licensed surveyor <br /> 4 4 GROUNDWATER SAMPLING PROCEDURES <br /> Ground water sample collection will be performed in accordance with the PHS-EHD's <br /> P <br /> Recommended Groundwater Sampling Guidelines, dated 15 February 1995 <br /> 4 4 1 Static Water Level Measurements <br /> Before purging and sampling during ground water monitoring events, static water level will be <br /> I measured using an electric water level indicator Water level data will be recorded to the nearest <br /> 0 01-foot from a reference point marked of the top of the PVC well casing Before and after each use, <br /> the measurement device will be rinsed with water <br /> Advanced GeoEnvzronmcntal,Inc <br />