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at other mines in similar geologic settings has found that groundwater levels tend to fluctuate being highest in the <br /> summer irrigation season and lowest in the winter and early spring. <br /> If,during mining or reclamation,the relative seasonal groundwater elevation at the southern monitoring wells(PZ-20 and <br /> PZ-27)differs from maximum conditions by more than three(3)feet, and the condition was not observed during baseline <br /> monitoring, or if the miner receives a complaint from a well or property owner,then the Miner will evaluate the cause and <br /> take action within seven (7)days and notify the DRMS. <br /> After the DRMS has been notified, the Miner will review the data and available information and submit a report to the <br /> DRMS within 30 days. The evaluation will include discussions with the well owner who has contacted the miner <br /> regarding a concern and review of baseline data from the well and vicinity to evaluate whether changes may be due to <br /> seasonal variations, climate, mining, slurry wall lining or other factors. The report will identify the extent of potential or <br /> actual impacts associated with the changes. If the extent of groundwater changes due to mining or reclamation activities <br /> is determined to be a significant contributing factor that has or may create adverse impacts, the mining associated <br /> impacts will be addressed. <br /> The Miner will begin implementing one or more mitigation measures if mining and reclamation activity is determined to <br /> be a significant factor to groundwater changes requiring mitigation. Mitigation measures may include, but are not limited <br /> to: <br /> ➢ Placing water in a recharge pond to raise groundwater levels around the well. <br /> > Constructing a local clay liner at the edge of the mine Cell (i.e. between the dewatering point and the well) in <br /> order to raise water levels on the well side of the liner and mitigate dewatering effects. <br /> ➢ Cleaning the well to improve efficiency. <br /> > Providing an alternative source of water or purchasing additional water to support historic well use in terms of <br /> water quantity and quality. If needed, water quality parameters will be checked in affected wells to ensure <br /> alternative sources support historic use. <br /> ➢ Modifying a well to operate under lower groundwater conditions. This could include deepening the well or <br /> lowering pumps. All work would be done at the miner's expense with the exception of replacing equipment that <br /> was non-functional prior to mining. <br /> 7.0 REFERENCES <br /> Anderson, Mary P.,"Applied Groundwater Modelling,Academic Press Inc., San Diego CA, 1992. <br /> Colton, 1978, "Geological Map of the Boulder, Fort Collins, and Greeley Area, Colorado,"U.S.G.S. Map I-855-G. <br /> Monitoring and Analysis Plan—Monarch DENM Gravel Mine -5- March 2024 <br />