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It is anticipated that the extent of pit inf lou induced draudowns will be less than • <br />predicted by the above exercise. The calculations are based on artificial, constant <br />pumping rates [ha[ cause maximum draudowns so that uo rs t-rase scenarios are presented. <br />The Theis equation does not account for aquifer recharge uh ich could reduce draudowns. In <br />atldition, for that portico of the Overburden aquifer that is unconfined, the Theis method <br />will predict larger drawdowns. <br />As can be seen when Exhibit 17-1 is compared with Exhibit 16-1, "water Rights in the <br />Vicinity of Yoast Mine", no existing eater rights or eater suppl i~es will be affected by <br />the pit inflow induced drawdowns ar,d the aerial extent of the impact is small. <br />Potential Mining Impacts on Local Water Rights. Complete descriptions of [he surface and <br />ground eater rights, as cell as unrighted water sources within and approximate to the <br />Yoast Mine, are contained in Tab [6, "Pater Rights and Alternative water Supplies". Table <br />16-1 provides investigated water rights information and Exhibit 16-1 depicts the Location <br />of righted and unrighted eater sources. Attachment 16-1 contains a consultant's report <br />detailing the study of eater rights in the vicinity of Yoas[ and the augmentation plans <br />for eater supplies and rights in the mine area. Attachment 16-2 contains another • <br />consultant's report detailing the study of long-term effects of pumpage from the proposed <br />Yoast production well. <br />Additional information is also contained in Tab 15, Hydrologic Monitoring Plan, and Tab <br />18, Hydrologic Reclamation Plan, pertaining ~to ground and surface water sources that have <br />been or will be monitored for potential impacts from the mining ,operation. Should any <br />proposed or ongoing monitoring show that impacts, particularly pi,t inflow drawdouns, to <br />the ground water aquifers are precluding its use, SLC will provide alternative eater <br />sources of comparable quantity and quality. <br />Several water rights have been secured by SCC for the life of the Yoast Mine (see Table <br />16-1 and Exhibit 16-1). The water rights have been secured for domestic, industrial, and <br />augmentation purposes and exist on Sage Creek, Scotchmans Gulch, and Grassy Creek. The <br />water rights owned by SCC are more than adequate for the prof ectedmining needs at Yoast. <br />Attachment 16-1 provides a more complete discussion of the rights and how the mining eater <br />uses will be adequately provided for. There are no forseeable mining impacts to water <br />rights in the vicinity of Yoast. • <br />12 Revised 03/01/95 <br />