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17 July 2001 <br /> AGE-NC Project No, 97-0327 <br /> Page 6 of 7 <br /> of water per 94-pound sack of cement. The grout will be placed by pumping through tremmic pipe. <br /> A grouting inspection will be scheduled with PHS-EHD personnel. A traffic-rated well box will be <br /> installed over the top of the well casing. <br /> 3.4. WELL DEVELOPMENT <br /> Development of the proposed well will consist of a combination of bailing with a stainless steel <br /> bailer to rernove the major portion of fine-grained sediment from inside the well, surging to flush <br /> out or draw in sediment from the filter pack and additional ground water evacuation (purging) with <br /> a submersible pump to finish the removal of fine-grained sediment. Developmental purging activities <br /> will be continued until field parameter(pH, electrical conductivity, and temperature) readings have <br /> stabilized and purged water is visually sediment-free. <br /> 3.5. EQUIPMENT DECONTAMINATION <br /> All down-hole drilling and sampling equipment will be pressure washed prior to starting the boring. <br /> 3.6. GROUND WATER MONITORING PROCEDURES <br /> Groundwater sample collection will be performed in accordance with PHS-EHD guidelines (Still <br /> Joaquin County Public Health Services Environmental Health Division Well Standards) and <br /> CVRWQCB guidelines (Tri-Regional Water Qualitv Control Board Recommendations for <br /> Preliniinat-v Investigations and Evaluation of Underground Storage Tanks) sampling protocols. <br /> 3.6.1. Static Water Level Measurements <br /> Prior to a]I ground water purging and sampling, static water levels in each well 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 on the top of each PVC well casing. Before and after each use, the <br /> measurement device will be rinsed with clean tap water. <br /> 3.6.2. Well Evacuation <br /> Subsequent to measurement of depth to water and prior to sampling, each well will be purged using <br /> a bailer or submersible pump to ensure that the sample is representative of the surrounding aquifer <br /> ground water. The well will be purged until: 1) a minimum of three casing volumes have been <br /> removed from the well; and/or 2) the field-measured ground water parameters have stabilized. <br /> Advanced GeoEnNironmental.Inc. <br />