2012-01-24_PERMIT FILE - M2011054 (4)

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Response to Adequacy Review Permit No. M- 2011 -054 Debeque Sand and Gravel Resource ATTACHMENT Ground Water Monitoring and Mitigation Plan Monitoring and Reporting Plan The operator will install two upgradient wells on the east side of the permit area and will monitor the lake level as the downgradient well groundwater flows east to west on the property. These wells will continue to be monitored quarterly for one year after mining operations are complete or dry- mining has ceased. Existing and /or preliminary data will be used to establish a baseline against which relative impacts from dewatering, other operations, and off -site effects may be analyzed. The operator will monitor water surface level using monitoring wells and the lake. If the operator does not encounter any problems with ground water during mining operations, then data summary and water level requirements will be submitted once a year to the Division. Potential adverse effects will be subject to intensified monitoring and /or mitigation, with adjustments to the program as necessary to account for such adverse effects, described below. Monitoring data will be used to identify any changes in groundwater flow or elevation associated with dewatering or other mining and reclamation activities. If the groundwater elevation in a well increases or decreases by four (4) or more feet from the seasonal range (as determined from baseline monitoring data), such change is plausibly and in fact attributable to mining operations, and the measured elevation is not consistent with groundwater elevation trends at the other wells on -site, the operator will monitor on a weekly basis and evaluate the appropriateness of mitigation measures if the variation continues unabated. In the event that the operator is contacted by impacted parties with wells, verifying a potential injury, within seven (7) days the Division will be notified. After the Division has been notified, the applicant will review data from all monitoring wells and submit a report to the Division within 30 days. Changes in measured groundwater elevations will be evaluated based on natural groundwater fluctuations and changes in non - project related local conditions including precipitation, river flows, and land use. The report will present results of the evaluation and identify any potential impacts associated with the change. Mitigation of potential impacts caused by changing groundwater elevations will be addressed based upon the specific location and nature of the impact. If, due to dewatering or other mining or reclamation activities, changes in groundwater elevation may or does in fact create adverse impacts to adjacent properties, the adjacent property owners will be notified and the impacts will be addressed to the satisfaction of the Division.