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rY I • 24 April 2000 AGE-NC Project No. 97-0327 ' Page 3 of 6 beneath the site in cross sectional view is depicted on Figures 3 and 4. ' 2.5. MONITORING WELL COMPLETION Soil borings MW-1, MW-2 and MW-3 were single-completed as ground water monitoring wells utilizing schedule 40, 2-inch diameter blank polyvinylchloride (PVC) well casing and perforated, 2-inch diameter PVC well casing(0.020-inch slot). Each well was installed by placing the PVC well casing assembly through the hollow stem of the augers to the total depth of the boring. The augers were incrementally raised as No. 2112 Lonestar Lapis Luster sand(filter pack)was slowly poured down the annulus between the well casing and the 1 inner wall of the hollow stem auger. The filter pack was placed adjacent to the screened casing from the bottom of the boring to a point approximately two feet above the top of the screen; following filter pack placement, a surge block was inserted into the well casing and was alternately raised and lowered(surged)repeatedly for approximately 10 minutes. Two feet of bentonite chips(annular seal) were placed above the filter pack and were hydrated with clean tap water. The remaining annular ,. space was backfilled with portland cement (grout seal). As-built monitoring well-construction diagrams are included as Figures 5 through 7. 2.6. SURVEYING OF GROUND WATER MONITORING WELLS IOn 01 March 2000, a California state-licensed survey engineer from Baumbach & Piazza, Inc. surveyed a reference point on the casing tops of wells MW-1, MW-2 and MW-3 to the nearest 0.01- foot relative to the City of Stockton Bench Mark Datum BM# 346. The surveying report(Baumbach 1 &Piazza Job No. 9797) is presented'in Appendix B. ' 2.7. WELL DEVELOPMENT ACTIVITIES ' On 03 February 2000, monitoring wells MW-1, MW-2 and MW-3 were developed utilizing a stainless steel hand bailer and a Grundfos submersible pump. ' Groundwater was..purged from each monitoring well until,the,produced ground water was visually sediment free; approximately 30 gallons of water were removed from each well. Purged ground water was containerized in properly labeled D.O.T.-approved model 17H 55-gallon drums and was ' stored on-site in an area lacking public access. Monitoring well field logs for development activities ., are included in Appendix C. Advanced CecEnvironmental,Inc.