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• of the total pumpage or 5.8 ac-ft/yr (Table 3). Most of the stream depletions aze <br />caused by long-term pumpage from the Yoast well. This is due to the location of the <br />Yoast well which is closely surrounded on three sides by the Trout Creek <br />outcrop/recharge area and, consequently, to areas where streams cross the Trout <br />Creek outcrop. Most of the ground water withdrawn is derived from aquifer storage. <br />Drawdown <br />Maximum drawdown of about 186 feet occurs in the Yoast well when both wells are <br />pumping at the end of mining, simulation year 15 (Figures Sa and 8b). When only <br />the Yoast well is pumped, the maximum drawdown is 186 feet suggesting that there <br />is no influence of the Seneca IIW well at the Yoast well when both wells are active. <br />Maximum drawdown for the IIW well at the end of simulation year 15 is l62 feet <br />when modeled both alone (Figures 4a and b) or together with the Yoast well (Figures <br />8a and 8b). Thus, the wells are not expected to interfere with each other. <br />• <br />Recovery <br />Recovery was simulated for 20 years past the end of pumpage (from years 2005 <br />through 2024). Drawdown of up to 11.7 feet remains in the unconfined outcrop area <br />upgradient of the Seneca IIW well at the end of simulation year 35, in the year 2024 <br />(Figures IOa and lOb). This is due primarily to the depleted unconfined storage, the <br />small amount of recharge available to this area, and to the Trout Creek Sandstone's <br />low to moderate transmissivity. In the year 2024, less than one foot of drawdown <br />may still occur up to five miles away from the Seneca IIW well. In the area of the <br />Yoast well, recovery is nearly complete with drawdowns of slightly greater than 1 <br />foot extending within a mile of the well. Based on the assumptions used in the <br />model, it is estimated that full recovery will be very slow near the IIW well. <br />• 7 <br />