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Hydrogeologic conditions, the river boundary and the distance from wells, indicate that there <br /> should be no significant effect on local groundwater users due to the mining on the Lafarge <br /> Brown property. If Lafarge receives a complaint from a well owner, Lafarge will initiate an <br /> evaluation of the cause and notify the DRMS within two weeks. <br /> After the DRMS has been notified, Lafarge will review the available data and information and <br /> submit a report to the DRMS within 30 days. To the extent practicable, the report will identify <br /> the extent of potential or actual impacts associated with the changes. The evaluation will include <br /> discussions with any well owner who has contacted Lafarge regarding a concern and review of <br /> available data from the well and vicinity to evaluate the cause of any changes (e.g., seasonal <br /> variations, climate, mining by Lafarge, mining by others, or other factors). Lafarge would also <br /> enlist the service of a contract professional hydrogeologic consultant to provide an opinion and <br /> meet with the Division to discuss the findings. If the claim cannot be resolved with this <br /> information, Lafarge would fund the service of a 3rd party consultant agreeable to the Division to <br /> render a separate opinion. If Lafarge's mining or reclamation activities are determined to be a <br /> significant contributing factor that has or may create adverse impacts, the mining-associated <br /> impacts will be addressed to the satisfaction of the DRMS. <br /> An initial temporary mitigation measure (for cases in which Lafarge's operation is a suspected <br /> cause) may entail providing an alternative water supply that meets the documented historic well <br /> production, or need, until further investigation can be conducted to determine if the well <br /> condition is due to Lafarge's mining operation. If, after review, the DRMS determines that the <br /> impact on a well, for which temporary mitigation has been initiated, is not a result of Lafarge's <br /> activities, or is not solely a result of Lafarge's activities, then Lafarge shall reduce or cease <br /> mitigation accordingly with the approval of the DRMS. Lafarge has no responsibility to provide <br /> mitigation for wells that are constructed after the permit is approved. <br /> Mitigation measures, divided into temporary and long term, may include, but are not limited to: <br /> Temporary: <br /> • Compensation for well owner to use their existing treated water system to replace the <br /> well production loss; <br /> • Provide a water tank and deliver water as necessary to meet documented historic well <br /> production or need; <br /> • Other means acceptable to both the well owner and Lafarge. <br /> Long-Term: <br /> • Cleaning a well to improve efficiency. <br /> • Providing an alternative source of water or purchasing additional water to support historic <br /> well use in terms of water quantity and quality. If needed, water quality parameters will <br /> be checked in affected wells to ensure alternative sources support the historic use. <br /> • Modifying a well to operate under lower groundwater conditions. This could include <br /> deepening existing wells or lowering the pumps. All work would be done at Lafarge's <br /> Greeley 35`h Avenue Mine(M-1977-036) <br /> DRMS 112 Reclamation Permit Amendment Application <br /> Groundwater Monitoring and Mitigation Plan <br /> Page 4 <br />