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t encountered as shown on plate 3. The mine should have over a million gallons in storage of a remarkably high quality water. Two water teats are enclosed in the appendix; one of April 23, 1969 by the State Health Department and one of March, 1974, taken by F.M. Fox and Associates. The only high chemical contents are sodium and total dissolved solids, neither of which are of serious concern." There is no indication whether the difference in water levels in the two main pockets of water is due to different aquifers being tapped or, if so, what isolates 'the two pockets from each other. 4.0 Monitor Well TP-W1 Early in May, 1983 an exploration hole that had been drilled with mud, near the south end of the proposed Twin Pines No. 2 Mine area, was completed by J.F. Sato and Associates as monitor hole TP-W1. It was backfilled to a depth of 205 feet, cleaned . and cased with 2-inch schedule 40 PVC to monitor the sandstone aquifer just below the Brookside seam. As shown in figure 2.04.7(1)-3 a 5-foot slotted PVC screen was placed opposite the sandstone aquifer in the interval from 191 to 196 feet. This zone was packed with No. 8-14 Fountain Sand gravel and isolated from below and above with bentonite. The rest of the hole was backfilled to the surface with 1/4 to 3/8-inch pea gravel. The surface was sealed off with cement and a 2 1/2 feet, 15-inch steel pipe with a hood and padlock was embedded in the cement to protect the PVC casing. The geophysical logs for borehole T.P. No. 8 (fig. 2.04.70)-1) and monitor hole TP-W1 (fig. 2.04.7(1)-2) show that there is a shale unit 2 to 3 feet thick between the Brookside coal and the underlying sandstone aquifer. The cross-sections in figures 2.04.6-1 and 2.04.6-2 do not show this shale because of scale but the sandstone is extensively seen as a sheet-like body throughout the project area. JFSA-36