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23 April 1999 <br /> AGE-NC Project No. 95-0,100 <br /> Page 6of7 <br /> if settling occurs. A nominal I-foot bentonite seal will be placed above the filter pack. The bentonite <br /> chips will be hydrated with five gallons of potable water. The bentonite chips will be a allowed to <br /> hydrate for a minimum of one-half hour prior to grouting. <br /> The remaining annular spaces 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 10 gallons of water per <br /> 94-pound sack of cement. The grout will be placed over the bentonite as a annular seal. Grouting <br /> procedures will be inspected by PHS-EHD personnel. A traffic-rated well box will be installed over <br /> the wells, in accordance with County regulations. Following completion of the monitoring Wells, <br /> well elevations and locations will be surveyed by AGE personnel,relative to monitoring well MW-1. <br /> 4.4. 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 finish the removal of sediment, Development activities will be.continued until <br /> field parameter(pH, electrical conductivity, and temperature)readings have stabilized. <br /> 4.5. GROUNDWATER SAMPLING PROCEDURES <br /> Groundwater sample collection will be performed in-accordance with pertinent applicable sampling <br /> protocols, details of which-are presented below. <br /> 4.5.1. Static Water Level Measurements <br /> Before sampling andduring quarterly ground water monitoring, static water level will be measured <br /> using an electric water level indicator. Water level data will be recorded to the nearest 0.01'foot from <br /> a reference point marked of.the top of the PVC well casing Before and after each use, the . <br /> measurement device will be rinsed with water. <br /> 4.5.2. Well Evacuation <br /> Subsequent to measurement of depth to water and prior to sampling,the upper water in the well will <br /> be purged using a disposable bailer of pug-pump to ensure that the sample is representative of the <br /> formation,rather than water standing in the well casing.The well will be purged until: 1)a minimum <br /> of three casing volumes is removed from the well; and/or 2) the field-measured ground water <br />