Laserfiche WebLink
Shadow/Mounding Analysis <br />Varra Gravel Operations <br />Longmont, Colorado <br />Page 2 <br />In July of 2010, I 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 />.Y9asr:HPT-s-.... 'k ' 'BAY'vL'`�t4S: b'R,62'0'hl4A'sc;lh.+f.M:NWY£+_R.uGx5rb"5`%aSaY.'�I v+F'«„c�•_#X.'s s4€.` iF'.r” a-a;�S�»".^t"-.+s-`g8'J3=:. aF°--%� 4T. 6,10 ,15,0 <br />