2016-12-28_PERMIT FILE - M2016076 (2)

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CIVIL RESIDURCFS,LIC ENGINEERS 6 PLANNERS December 26,2016 Mr. Eric Scott Division of Reclamation, Mines,and Safety 1313 Sherman Street, Room 215 Denver,Colorado 80203 RE: Lupton Meadows Gravel Mine,Permit No.M-2016-076; Response to Mr.&Mrs.Temmer Dear Mr. Scott: This letter is being generated to respond to the Temmers concerns. The Temmers are direct neighbors to the north of the proposed Lupton Meadows Gravel Mine. - In response to the potential for groundwater impacts. To summarize and as reported in the DRMS permit submittal,groundwater impact memo. The area directly to the south has been slurry lined approximately thirteen years ago and water levels were reported from that mines monitoring program. Results and a short discussion from the groundwater memo is summarized below: Summary of Groundwater Regime The prevailing groundwater flow direction at the Lupton Meadows Gravel Mine area is north-northeast toward the South Platte River. Locally the groundwater levels and flow directions are influenced by, ➢ Existing Mines: The slurry walls associated with the Koenig Pit and He/t Pits create a flow obstruction in the local groundwater and are located immediately upgradient(south)of the Site, ➢ Surface Water The Site is bounded by two major drainage ways,the South Platte to the east and Little Dry Creek to the west. These two drainages act as natural drains that maintain groundwater elevation around approximately 484525 to 4840.62 at the South Platte and 4844.78 to 4843.0 at Little Dry Creek from south to north respectively, with normal base flow streams at distances ranging from 230 feet to 450 feet. The streams are approximately 5.5 feet to 8 feet below the natural grade on the Site based on monitoring wells adjacent to the South Platte and Little Dry Creek. Monthly water level monitoring has been completed since August at three monitoring wells drilled/n August 2016 and two monitoring wells(MW-3&MW-7)associated with the initial groundwater investigation in 2003. Historic water level data from monitoring in 200312004 has also been included in the Table below. Comparison of Water Levels Average Level Average Level Well (2005) (2016) CR-3 - 4842.79 CR-4 4845.09 CR-5 - 4842.77 MW-3 4845.87 4845.66 MW-5 4844.86 - MW-6 4842.17 - MW-7 4841.33 4840.735 Comparing 2005 and 2016 water level data show a range of 0.60 feet decrease in groundwater to a 0.60 foot increase. This indicates that the local groundwater is not significantly affected by the slurry wall(s)to the south(Heft Pit&Koenig 323 FIFTH STREET• P.O. Box 68O 0 FREDERICK, COLORAD❑ 80530 9 PHONE: 303.833.1 41 6 0 FAx: 303.B33.2850