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M-2000-016, Lafarge West, Inc.: Riverbend Operation, AM-01 July 25, 2005 <br />Adequacy Memo No. 4 Page 5 <br />Groundwater Monitoring Plan: <br />21. Please also see Item 15 for comments applicable to the Groundwater Monitoring Plan. <br />22. Please be aware that whenever the set trigger points or offsite impacts set mitigation <br />measures in motion, Lafarge needs to perform as many of the proposed measures to <br />mitigate well or other related impacts as necessary to rectify the situation to the <br />Division's satisfaction. <br />23. The Division does not accept the proposal to monitor for only 6 quarters after mining, or <br />to discontinue monitoring "as mining proceeds " The Division will require that ground <br />water monitoring continue quarterly until the Division approves an applicant request to <br />cease monitoring. Please change the application accordingly. <br />24. An acceptable trigger point for monitoring wetlands would be 2 feet, or ff the vegetation is <br />showing signs of stress, whichever comes first. Since cottonwoods could die by the time <br />a 2 feet drop in ground water level occurs, a trigger point of 1 foot or if the vegetation is <br />showing signs of stress, whichever comes first, would be acceptable. Immediate interim <br />mitigation measures must be specified to protect this vegetation. <br />25. All cottonwood groves in the wildlife corridor and within the boundaries of potential offsite <br />ground water impacts must be identified on all maps to help assure adequate monitoring <br />is in place. <br />26. On the Monitoring Wells location map, the cells shown in Phase 1 still do not entirely <br />match those on the Mine Plan maps of Exhibit C. Please modify the Monitoring Well <br />tocationsmap to correctaB discrepancies: - - <br />27. As noted in the April 22, 2005 review, ground water gradients must be clearly defined on <br />associated maps. <br />