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on sandstones of the Wasatch/Ohio Creek formations. Water levels in these two wells show minor seasonal fluctuations, with peaks in early spring and troughs in late fall and early winter (Figures 3.3-9 and -10). The downstream well, OW-3, deviates from the seasonal fluctuations in early 1983 as shown by its continual rise through August, at which time it begins to decline. This is most likely due to irrigation activities of Barton Porter, including his use of a sizeable reservoir located between the up and downgradient wells, during this time period. OW-4 encountered dark brown, medium dense, silty sand with oc- casional sandstone fragments and slightly sandy, hard, blue to gray claystone with occasional sandstone lenses. The hydrograph for well OW-4 (Figure 3.3-11) also shows a cyclic water fluctuation during the data collection period. The peaks are in late winter through early spring and the troughs in mid summer • through fall and early winter. Since this is a south facing slope and the water-bearing zone is fairly shallow, the water levels may be very sensitive to any late winter warmup and snowmelt. This suggests that recharge is predominantly due to snowmelt rather than summer thunderstorms. The upgradient wells OW-3L and OW-7 in the loadout and facility areas, respectively, have been dry during the monitoring period. The downgradient wells OW-8 and OW-4L have been monitored for the monthly and quarterly parameters during the baseline period. OW-8, the downgradient facility well, encountered 85 feet of brown, loose to medium dense, clayey, sandy, gravel, with some cobbles and boulders. OW-4L encountered brown, medium to hard, sandy, gravel- ly, clay with some gravel and cobble lenses. A ten foot variation in water level in OW-8 has been observed since • September, 1983, whereas a four foot variation has been recorded in NC8C - Coal Ridge ;1 3-27 AeC/1145/900301