2008-11-03_REVISION - M1999098 - Laserfiche WebLink

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Wells Within 600 Feet Owners of wells within 600 feet of existing permitted extraction cells have previously signed a 600-Foot Well Spacing statement and/or been notified of the gravel pit well permit for existing permitted operations. Additional well owners identified within 600 feet of the proposed amendment areas will receive notification in conjunction with a new well permit application. If requested by the well owner, Aggregate Industries will attempt to measure water levels in these wells prior to mining. GROUNDWATER MITIGATION Monitoring data will be used to identify potential changes in alluvial groundwater flow or elevation associated with mining and reclamation activities. Baseline data collected from the monitoring program will provide a range of relative water levels associated with pre-mining groundwater conditions. Experience at other sand and gravel mine sites in similar geologic settings has found that groundwater levels tend to fluctuate between two to four feet each year, being highest in the summer and lowest in the winter and early spring. If, during mining, the relative seasonal groundwater elevation at any of the domestic wells or monitoring wells differs from the baseline conditions by more than two feet, and the condition was not observed during baseline monitoring, or if Aggregate Industries receives a complaint from any well owner within 600 feet from the site boundary, then Aggregate Industries will evaluate the cause and take action within 30 days and notify DRMS. After DRMS has been notified, Aggregate Industries will review the available data and information and submit a report to DRMS within 30 days. The evaluation will include discussions with any well owner who has contacted Aggregate Industries regarding a concern and review of baseline data from the well and vicinity to evaluate whether changes may be due to seasonal variations, climate, mining, or other factors. The report will identify the extent of potential or actual impacts associated with the changes. If the extent of groundwater changes due to mining or reclamation activities is determined to be a significant contributing factor that has or may create adverse impacts, the mining associated impacts will be addressed to the satisfaction of the DMG. • Aggregate Industries will begin to implement one or more mitigation measures if mining and reclamation activity is determined to be a significant contributing factor to groundwater changes requiring mitigation. If, however, a subject well has not been put to beneficial use prior to mining, then Aggregate Industries would have no responsibility to provide mitigation. • Mitigation measures may include, but are not limited to: Cleaning a well to improve efficiency. Aggregate Industries-WCR, Inc. - Riverview Resource -2- February 11, 2008 Groundwater Monitoring and Mitigation Plan River Resource Amendment to Permit M1999098 112C Page G9 of G37