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<br />used where streams with year-round flows intersect a Trout Creek sandstone • <br />outcrop, and along the north-northwestern model boundary where the Trout <br />Creek sandstone is downgradient and overlain by the Williams Fork <br />Formation, Lewis Shale, and Lance Formation, and 3) a RECHARGE boundary <br />which was applied to the recharge nodes located along the Trout Creek <br />outcrop areas (Figures 1 and 2). <br />4. Aquifer Parameters <br />A 50 hour pumping test was conducted at the Seneca IIW well ql. The <br /> <br />transmissivity and confined storage coefficient values were calculated and <br />the unconfined storage coefficient was estimated (Williams and Driver, <br />1982) as follows: <br />Transmissivity = 23.3 ft2/d <br />Confined storage = 10-4 • <br />Unconfined Storage beneath the Trout Creek outcrop = .10 <br />These parameters were used to characterize the aquifer in the model. <br /> <br />5. Pumping Schedule <br />Seneca IIW well Yoast well <br />pump on: 1990 through 2004 (15 yrs) 1996 through 2004 (9 yrs) <br />recovery: 2005 through 2024 (20 yrs) 2005 through 2024 (20 yrs) <br />Mining at Seneca IIW is scheduled to begin in the year 1990, and at <br />Yoast in the year 1996. Mining at both properties is scheduled to be <br />complete in the year 2004. <br />8333003.004 <br />4 <br />• <br />r'n..T ~...~ :... <br />