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L.G. Everist, Inc. <br />Fort Lupton Sand and Gravel Mine, M -1999 -120 <br />Adequacy Response -lb <br />EXHIBIT G, WATER INFORMATION - ADDENDUM 2 <br />Groundwater Monitoring Data Analysis <br />The Groundwater Monitoring Data Analysis has been revised to simplify <br />the overall analysis and to incorporate the changes discussed between <br />the Division of Reclamation, Mining, and Safety and L.G. Everist, <br />Inc., the operator /owner of the Fort Lupton Sand and Gravel mine. <br />Map Exhibit G -2, Monitoring Well Locations <br />This map has been revised to be used with this Groundwater Monitoring <br />Data Analysis. The revisions are as follows: (a) the wells that are <br />part of this analysis (see tables and graphs) are colored light blue, <br />(b) the external water features (river, ditches, creek) have been <br />highlighted and labeled, and (c) the permit boundary has been <br />highlighted as well. <br />Baselines and Trigger Points <br />The baselines for each well have been agreed upon and determined by <br />taking the high and low elevations of each well for the first two (2) <br />years of data collection. At this time, the trigger points have been <br />determined as greater than one (1) foot above the high baseline and <br />greater than one (1) foot below the low baseline. <br />The possibility of adjusting the baseline ranges in the future was <br />discussed between the Division and the operator. As the operator <br />collects more data over the years - and from wells that are outside <br />the influences from the operations - if system -wide trends are seen in <br />wells, the operator and the Division may review and possibly revise <br />the baseline ranges of some wells if appropriate. The baseline range <br />changes would be documented with a Technical Revision. <br />If the groundwater levels in a monitoring well pass their trigger <br />points more than 3 months in a row, the operator will investigate to <br />determine causes, and do mitigation as necessary. The operator will <br />notify the Division of the trigger investigations and any subsequent <br />mitigation. <br />If a monitoring well(s) that is internal to L.G. Everist operations <br />hits a trigger point, L.G. Everist may investigate to determine causes <br />of the groundwater level changes, but mitigation would most likely be <br />unnecessary because the only affected party would be L.G. Everist. <br />A neighbor complaint could also be a "trigger ". Examples of possible <br />issues are: water well levels low, flooding fields, and vegetation <br />suffering. L.G. Everist would investigate to determine causes and <br />mitigate if necessary as needed following the mitigation plan approved <br />by the Division in 2005. <br />FL- DRMS- GroundwaterAnalysis- Oct2012 doc <br />October 2012 <br />