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dewatering, and backfilling activities. As stated previously, background monitoring data <br /> suggested a groundwater gradient across the Wattenberg Lakes site in the northeast <br /> direction, apparently influenced by groundwater flowing to the site from both the south <br /> and the west. It appears that the dewatering operations, and potentially the backfilling <br /> activities,may have decreased the influence of groundwater flow from the south. With the <br /> slurry wall to the east, groundwater flow from the west appears to have shifted the <br /> groundwater gradient to a more east-northeast direction near MW-2 (see Figure 4). <br /> However, if the continued groundwater elevation decrease in MW-2 was solely due to a <br /> shift in the groundwater gradient across the Wattenberg Lakes site, it is reasonable to <br /> assume that the same affects would be seen at MW-1. Monitoring data at MW-1 indicated <br /> a slightly lower groundwater elevation than season lows during the recent mine dewatering, <br /> but the groundwater elevation has also begun to recover. This suggests there may be <br /> additional influences on groundwater elevations at piezometer MW-2. <br /> Immediately north of piezometer MW-2 is the Town of Wattenberg. The town municipal <br /> well is about 600 feet northwest of the piezometer. With the groundwater gradient shift <br /> near MW-2, the piezometer may now be influenced by the municipal well cone of <br /> depression. <br /> As dewatering outside of the slurry wall decreases and mined areas are backfilled, south to <br /> north groundwater flow across the site would be expected to increase,even as the area west <br /> of the slurry wall continues to receive groundwater flow from the west. It is anticipated <br /> that the increased flow from the south will shift the groundwater gradient back to a <br /> northeastern direction and the baseline condition. Until that time, areas downgradient of <br /> the mining and dewatering activities will likely continue to be primarily influenced by <br /> groundwater flowing from the west. <br /> Monitoring of the on-site piezometers will continue through mining and reclamation <br /> activities. The monitoring data will be evaluated on a regular basis to assess on-site <br /> conditions and potential off-site impacts from Aggregate Industries' operations. <br /> If you have any questions or need additional information regarding this project, you may <br /> contact me at(970) 227-2803. <br /> Sincerely, <br /> Blue Earth Solutions, LLC <br /> William Schenderlein, P.E. <br /> Project Engineer <br /> Cc: Connie Davis <br /> Aggregate Industries—WCR, Inc. <br /> Page 3 of 3 <br />