Laserfiche WebLink
Shadow /Mounding Analysis <br />Varra Gravel Operations <br />Longmont, Colorado <br />Page 2 <br />In July of 2010, 1 provided Varra with the results of a groundwater model simulation of an <br />impermeable barrier in a uniform flow field. The model results closely approximate actual field <br />conditions as documented from water level data obtained by Varra. That analysis is presented in <br />Attachment C. <br />This analysis indicates that lining mined gravel pits has almost unmeasurable influences to the <br />surrounding groundwater hydrology and does not change hydraulic gradients beyond the variations <br />that would normally be expected in the geologic settings associated with your operations. It is my <br />understanding the Division of Reclamation and Mine Safety has requested technical revisions to <br />your mine permits for the placement of liners at active operations such as Great Western Sugar. <br />Until the pits are completely lined and dewatering is no longer occurring a static analysis cannot be <br />performed, however, the analysis presented should be valid for mines in similar geologic settings. <br />If you have any questions regarding this letter or attachment, please contact me at 970 - 590 -3807. <br />Sincerely, <br />AWES, LLC <br />Joby L. Adams, P.G. <br />Principal Hydrogeologist <br />-AwU—s 4809 Four Star Court, Fort Collins, CO 80524 910-590-390/ <br />