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KLEINFELDER Appendix C. The results of the laboratory analysis is discussed in Section 5.2, Chemical Analytical Results., o A 3-foot bentonite plug was placed above the sand pack to provide a seal f against surface water infiltration. The bentonite was hydrated with City of 1� Tracy supplied water. o The remaining annular space was filled with cement/bentonite grout to the surface. o Each well was secured.inside a locked well cover. The well construction details are summarized in Table 1, Monitoring Well Construction Details (Appendix A). The Iithologic logs and drafted diagrams showing well construction details are contained in Appendix B. 33 SURVEY A field survey was made on November 17, 1988 by Nolte and Associates of Manteca, California. The "X", "Y" (Horizontal) and "Z" (Vertical) coordinates for well tap-of-casings were measured relative to a U.S. Coast and Geodetic benchmark. The "X" and "Y" coordinates were measured to an accuracy of the nearest 0.001 foot. The "Z" coordinates were measured to the nearest 0.1 foot. . 3. O 4 MONITORING WELL DEVELOPMENT AND SAMPLING On November 21, 1988,'the wells were checked for floating product, sheen, or odor using a clear acrylic bailer.,,No odor, sheen, or floating product was observed in the monitoring! wells. The wells were then developed by drawing the sediment from the formation into and out of the well and setting the filter pack. Because of slow recovery of the ground water into MW-2, only two well volumes could be purged from that well. Approximate 1.3 well volumes were purged from MW-1 and approximate 3.3 well volumes were purged from MW=3. Purged water was containerized in 55-gallon drums. On November 29, 1988, the monitoring wells were opened and initial depth to water readings were measured using a Slope Indicator Company electronic water level indicator. After the depth to water readings were recorded, the wells were purged and sampled. 156-88-2362 5