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SUMMARY <br />• <br />A very conservative approach was used to model the effects of pumpage on surface <br />flows by underestimating recharge and overestimating pumping rates and the amount <br />of hydraulic communication between the Trout Creek Sandstone outcrop areas and <br />the intersecting surface-water features. The modeling results show that the largest <br />impact to streamflow.s occurs at the end of mining in simulation year l5 (2004) when <br />both wells have been pumping. The stream depletions are due primarily to pumpage <br />from the Yoast well and effects are felt only in streams close to the Yoast mining <br />operation. Recovery will almost be complete at the Yoast well in 2024; however, <br />drawdowns of up to 11.7 feet occur in the azea upgradient of the IIW well. It is <br />anticipated that recovery will be slower in this region. Given the limited use of the <br />Trout Creek Sandstone aquifer and the conservative model assumptions, it is <br />anticipated that there should be no domestic, agricultural, or livestock wells that will <br />be adversely affected by the Seneca IIW or Yoast wells combined pumpage from the • <br />Trout Creek Sandstone. <br />8 <br />• <br />