2010-01-21_PERMIT FILE - M2009082 (11)

Home Browse Search

An initial temporary mitigation measure (for cases in which Lafarge's operation is a suspected cause) may entail providing an alternative water supply that meets the documented historic well production, or need, until further investigation can be conducted to determine if the well condition is due to Lafarge's mining operation. If, after review, the DRMS determines that the impact on a well, for which temporary mitigation has been initiated, is not a result of Lafarge's activities, or is not solely a result of Lafarge's activities, then Lafarge shall reduce or cease mitigation accordingly with the approval of the DRMS. Mitigation measures, divided into temporary and long term, may include, but are not limited to: Temporary: • Compensation for well owner to use their existing treated water system to replace the well production loss; • Provide a water tank and deliver water as necessary to meet documented historic well production or need; • Other means acceptable to both the well owner and Lafarge. Long-Term: • Cleaning a well to improve efficiency. • Providing an alternative source of water or purchasing additional water to support historic well use in terms of water quantity and quality. If needed, water quality parameters will be checked in affected wells to ensure alternative sources support the historic use. • Modifying a well to operate under lower groundwater conditions. This could include deepening existing wells or lowering the pumps. All work would be done at Lafarge's expense with the exception of replacing equipment that was nonfunctional prior to the impact. • If existing wells cannot be retrofitted or repaired, replacing the impacted well with a new well. • Providing groundwater injection/recharge to eliminate or reduce offsite impacts. If mining near the Cache la Poudre River results in stress to cottonwood or other riparian trees, Lafarge will mitigate the effect by using dewatering discharges or other water sources from decreed rights to irrigate the trees. Along with review of groundwater level monitoring data, trees in the vicinity of active mining and/or dewatering will be observed visually once a month to monitor for vegetative stress. Stress conditions will be gauged relative to other trees along the river in areas not subject to potential effects on groundwater levels due to mining. If a groundwater mitigation action is required, Lafarge will notify Weld County and the DRMS of the condition, action taken, and result. Lafarge West, Inc. - Parsons Mine 8 Groundwater Monitoring and Mitigation Plan