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08 December 2005 <br /> AGE-NC Project No. 01-0828 <br /> Page 7 of 9 <br /> W <br /> Schedule 40 PVC blank well casing and 0.020-inch slotted well screen installed from 45 feet to <br /> LW 65 feet bsg. A monitoring well construction diagram is depicted on Figure 5. <br /> After installing the well casing in each pilot boring,a filter pack material consisting of pre-washed <br /> #3 Lonestar sand will be added through the augers from total depth to approximately 2 feet above <br /> the screened interval. Following placement of the filter pack, the well will be surged to assist in <br /> settling the filter pack. Additional sand will be added if settling occurs. . <br /> L <br /> A nominal 2-foot bentonite chip seal will be placed above the filter pack to minimize the potential <br /> for grout penetration into the screened section of the wells. The bentonite seal will be formed by <br /> W pouring bentonite chips into the annulus and allowing them to settle on the filter pack.The bentonite <br /> will be allowed to hydrate for a minimum of/2-hour prior to grouting. <br /> +a• The remaining annular space will be filled to within 1 foot of the ground surface with a cement <br /> grout. The grout mixture will consist of Type I/II portland neat cement and not more than 6 gallons <br /> of water per 94-pound sack of cement. The grout will be placed by pumping through a tremie pipe. <br /> A grouting inspection will be scheduled with EHD personnel. <br /> Following completion of the monitoring wells,well elevations and locations will be surveyed by a <br /> California-licensed surveyor relative to a City of Stockton elevation benchmark. <br /> LW 4.3. WELL DEVELOPMENT <br /> +6W Development of the proposed wells will consist of a combination of bailing with a stainless steel <br /> bailer to remove 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 with a Waterra <br /> V, inertia pump to finish the removal of fine-grained sediment. Developmental purging activities will <br /> be continued until field parameters(pH,electrical conductivity,and temperature)have stabilized and <br /> purged water is visually sediment-free. <br /> 4.4. GROUNDWATER SAMPLING PROCEDURES <br /> 1.� <br /> Ground water sample collection will be performed in accordance CVRWQCB guidelines and the <br /> EHD's Recommended Groundwater Sampling Guidelines, dated 15 February 1995. <br /> Lr Advanced GeoEnvironmental,Inc. <br /> V <br />