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} kn KLEINFELDER o The well casing is 2-inch inside-diameter, flush-threaded joint, schedule 40 PVC pipe. The PVC casing was steam cleaned prior to installation in each borehole. o The well screen sections are perforated with 0.010-inch fact -cut slots.or i o The annular space between the wall of the boring and the casing was backfilled with Lone Star Industries #0/30 sand to approximately 2 feet above the top of the perforated section. o A 2- to 3-foot bentonite plug was placed above the sand pack to provide a seal against surface water infiltration. The bentonite pellets were hydrated with distilled water. o Each monitoring well was secured inside a locking monument by cementing r in place. A final water-tight cover was installed to grade for�MW-2 and MW- 3. The water-tight cover for MW-1 will be installed-J. during hospital construction to insure.the proper final elevation. The specific construction details for each monitoring well are included on, Plates 6 through 9 (Appendix A). Ground water was first encountered in MW-1 at a depth of 18.5 feet, in MW-2 at 14.0 feet, in B-8 at 14.5 feet and in MW-3 at 14.0 feet. € 3.4 MONITORING WELL DEVELOPMENT AND SAMPLING The three monitoring wells were developed on March 20, 1989. Water level measurements were taken prior to and after each well development. Each well was first sampled with a clean acrylic bailer and visually inspected for hydrocarbon layer or sheen. :INo product layer or sheen was observed. The wells were surged during the installation procedures prior to placing the bentonite seal to settle the sand pack. During development, the wells were purged with a clean bailer. Approximately 50 gallons of water was removed from MW-2, and 30 gallons each from MW-1 and MW-3. The water in all three wells did not come completely free of fines as the water bearing formation consisted primarily of silt and clay. All purged water was stored in 175-89-543 5