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"W� <br /> 10 October 1999 <br /> AGE-NC Project No. 99-0559 <br /> Page 7 of 8 <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 the ground surface with a <br /> cement grout. The grout mixture will consist of type 1/11 portland neat cement and not more than 6 <br /> gallons of water per 94-pound sack of cement. The grout will be placed by pumping through <br /> tremmie pipe. The PHS-EHD will be notified for grout inspection at least 48-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 /> 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 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 the <br /> surveyed reference point marked of the top of the PVC well casing. Before and after each use, the <br /> measurement device will be washed and rinsed with water. <br /> 4.5.2. Well Evacuation <br /> Subsequent to measuremer>t of depth to water and prior to sampling, the well will be purged using <br /> a submersible pump or a disposable bailer 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 /> Advanced GeoEniironmental,Inc. <br />