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a • <br />Mr. Gregg Squire <br />May00 <br />Png 3 4 <br />~2_ <br />Mitigation of potential impacts caused by changing ground water elevations will be <br />addressed based upon the specific location and nature of the impact. If potential impacts <br />aze identified, monitoring data will be used to compaze measured ground water elevations <br />with ground water conditions observed prior to mining or reclamation activities. <br />Changes in measured ground water elevations will be evaluated based on natural ground <br />water fluctuations and changes in non-project related local conditions including <br />precipitation, river flows, and land use. If, due to mining or reclamation activities, <br />changes in ground water elevation create adverse impacts to adjacent properties, the <br />impacts will be addressed to the satisfaction of the Division. <br />• The applicant does not anticipate dewatering operations at the site to impact the water <br />rights of adjacent well owners. However, once dewatering at the site has started, ground <br />water levels in the immediate vicinity are expected to drop. If water levels are dropping <br />in adjacent wells, due to dewatering at the Riverbend operation, such that well owners <br />historic water production may be injured, the applicant will begin to implement one or <br />more of the following measures. However, if the well has not been put to beneficial use <br />prior to mining, the applicant should have no responsibility to provide mitigation. <br />1. Modify existing wells to operate under lower ground water conditions. This <br />would include re-drilling existing wells to deeper depths or lowering the pumps. <br />All work would be done at the applicants expense with the exception of replacing <br />equipment that was non-functional prior to mining. <br />2. If existing wells cannot be repaired, the applicant will drill a new well for the <br />owner to replace the damaged well. The new well will produce water of the same <br />quantity and quality to support the historic use. <br />Comment III <br />The plan maps in Exhibit C and Exhibit F have been corrected to illustrate that mining will not <br />extend beyond the permit boundary. The revised Exhibit C and Exhibit F plan maps aze <br />presented in Attachment D. <br />Sincerely, <br />T~~ PL~,GL~~ . <br />William Schenderlein <br />Project Engineer <br />Enclosures <br />cc: TA File #99-138 <br />Weld County Clerk to the Boazd <br />Duane Bollig, Lafazge <br />List of Objectors grid Other Interested Parties <br />