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2005-10-24_REVISION - M2000016 (2)
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2005-10-24_REVISION - M2000016 (2)
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Last modified
6/15/2021 2:53:40 PM
Creation date
11/21/2007 7:40:38 PM
Metadata
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Template:
DRMS Permit Index
Permit No
M2000016
IBM Index Class Name
Revision
Doc Date
10/24/2005
Doc Name
Seventh Adequacy Review Response
From
Tetra Tech RMC
To
DMG
Type & Sequence
AM1
Media Type
D
Archive
No
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monitoring program will provide a range of relative water levels associated with pre-mining <br />groundwater conditions. Experience at other sand and gravel mine sites in similar geologic <br />settings has found that groundwater levels tend to fluctuate between two to four feet each year, <br />being highest in the summer and lowest in the winter and early spring. <br />WELLS <br />If, during mining, the relative seasonal groundwater elevation at any of the domestic <br />wells or monitoring wells adjacent to domestic wells differs from the baseline conditions <br />by more than two feet, and the condition was not observed during baseline monitoring, or <br />if Lafarge receives a complaint from any well owner within 1,500 feet from the site <br />boundazy, then Lafarge will evaluate the cause, or take action within 7 days as indicated <br />below, and notify the DMG. <br />• If a well goes dry, Lafarge will implement mitigation measures within 7 days. Mitigation <br />measures would include providing a temporary alternative water supply that meets the <br />documented historic well production, or need, until further investigation can be <br />conducted to determine if the well condition is due to the mining operation. Historic <br />production will be documented as outlined in the above section `Wells Within 600 Feet'. <br />After the DMG has been notified, Lafazge will review the available data and information <br />and submit a report to the DMG within 30 days. The evaluation will include discussions <br />with any well owner who has contacted Lafazge regarding a concern and review of <br />baseline data from the well and vicinity to evaluate whether changes may be due to <br />seasonal variations, climate, mining, or other factors. The report will identify the extent <br />of potential or actual impacts associated with the changes. If the extent of groundwater <br />changes due to mining or reclamation activities is determined to be a significant <br />contributing factor that has, or may create adverse impacts, the mining associated impacts <br />will be addressed to the satisfaction of the DMG. <br />• If, after review, the Division of Minerals and Geology determines that the impact on a <br />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 <br />cease mitigation accordingly with the approval of the DMG. <br />Lafarge will begin to implement one or more mitigation measures if mining and <br />reclamation activity is determined to be a significant contributing factor to groundwater <br />changes requiring mitigation. Lafarge has no responsibility to provide mitigation for <br />wells that are constructed after the permit is approved. <br />• Mitigation measures, divided into temporary and long term, may include, but are not <br />limited to: <br />Temporary: <br />- Compensation for well owner to use their existing treated water system to replace <br />the well production loss; <br />i.afarge West, Inc. Riverbend <br />Groundwater Monitoring and Mitigation Plan <br />-4- <br />October 2005 <br />H:\4137_012 02\GmundwaternRiverbend GW Mon & Mitigation PUn 8-2&OS.doc <br />
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