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Mr. Gregg Sguire <br />Ocm6er 19, 2004 <br />Page 3 of 4 ~ - <br />observed data trends during mining and reclamation activities may make it appropriate to reduce <br />the monitoring frequency in one or more wells. If applicable, the applicant will request that the <br />Division allow for the reduction in monitoring frequency. <br />Monitoring data will be used to identify potential changes in alluvial groundwater flow or <br />elevation associated with dewatering, installation of the scurry walls, or other mining and <br />reclamation activities. Baseline data collected from the monitoring wells has provided a range of <br />relative water levels associated with current groundwater conditions both upgradient and <br />downgradient of the site. If, during dewatering or after installation of the slurry wall, the relative <br />groundwater elevation between two or more of the wells differs from the seasonal baseline <br />conditions by more than two (2) feet, the Division will be notified. <br />After the Division has been notified, the applicant will review data from all the monitoring wells <br />and submit a report to the Division within 30 days. Changes in measured groundwater elevations <br />will be evaluated based on natural groundwater fluctuations and changes in non-project related <br />local conditions including precipitation, river flows, and land use. The report will present results <br />of the evaluation and identify any potential impacts associated with the change. Mitigation of <br />potential impacts caused by changing groundwater elevations will be addressed based upon the <br />specific location and nature of the impact. If, due to dewatering, installation of the slurry wail, <br />or other mining or reclamation activities, changes in groundwater elevation may create adverse <br />impacts to adjacent properties, the adjacent property owners will be notified and the impacts will <br />be addressed to the satisfaction of the Division. <br />If dewatering of the Wattenberg Lakes site (or installation of the slurry wall) creates injuries to <br />surrounding wells, the applicant will take all necessary actions to remedy the injuries. If water <br />levels are dropping in adjacent wells, due to installation of the slurry wall or dewatering-at the <br />Wattenberg Lakes site, such that well owners historic water production may be injured, the <br />applicant will begin to implement one or more of the following measures. However, if the well <br />has not been put to beneficial use prior to mining, or does not have the legal right to operate, the <br />applicant should have no responsibility to provide mitigation. Mitigation measures may include, <br />but are not limited to: <br />I. Modify existing wells to operate under lower groundwater conditions: This would <br />include re-drilling. existing wells to deeper depths or lowering the pumps. All work <br />would be done at the applicant's expense with-the exception of replacing equipment that <br />was non-functional prior to mining. <br />2. If existing wells cannot be repaired, the applicant will drill a new well for the owner to <br />replace the damaged-well. The new well will produce water of the same quantity and <br />quality to support the historic use. <br />3. Provide an alternative source of water to support the historic well water use. <br />Additionally, if it is determined that installation of the slurry wall creates mounding or <br />shadowing impacts to surrounding water resources, the applicant will take appropriate corrective <br />action. Impacts would trigger mitigation measures that may include, but are not limited to: <br />1. Pumping from mounding areas or mine dewatering operations to recharge ponds in <br />shadowing azeas. <br />.,. tra.~. 3'r:+.3m~ .rb':+, 4s~a~+y.5x„v'[ ~.. •='t.. a.~.., ,ti." Pr. ::~{ Sn_a ~ I <br />