2014-06-18_HYDROLOGY - M2001051 - Laserfiche WebLink

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Upper Poudre Combined SWSP June 18, 2014 Page 2 of 10 the Partners Combined SWSP, they are within thus final reclamation liability remains with MMM assthe one Office DRMS Pitt for Home Office Pit and The Overland Pond Site is currently active. The siteis made up of five individual c liner for cell 1 was approved on October 5, 2011, and the liner for cell 2 was approved 16, 2013. Cell 4 has been lined, but the liner is not eta ells. The planned to be completed by August 2014. Celt 5 will be tined prior to an pp oved on December Y approved, and the liners for cells 3 and 5 are not expose any ground water prior to or during the mining ground water at the Overland Ponds Site is in g the linear feet y mining and therefore will Based on a trench width of 6 feet, the total exposed process. Currently, the only exposed noted above, cell 3 is proposed to be lined b Au of at the site trenches within cell 3. p d surfacearea at the site equals 0.43 acres. As ground water at the site. Please note that until the liners for cells 3-5 area roved August 014, after which time there wilt be no exposed office, any water exposed within their lined perimeters must be treated as groundby this evaporation losses assessed. water with For the North Taft Hill Expansion Site, there are two ponds of 2.45 acres and 5.07 are exposing ground water. The North Taft Site is proposed to be mined during this plan period. currently inactive and is not P acres that See Figure 1 for the location and boundaries of the subject mining sites. Depletions During the term of this plan, consumptive use at the Home Office Pit will evaporative depletions from exposed ground water and waterpumped for dust controlof use at the Overland Ponds Site will consist of evaporative depletions from t consist d water lost with mined product; and consumptive use at the North Taft Hill Expansion consumptive Site wilt be limited to evaporative depletions from exposed ground water. The exposed ground water and sites are shown in Table B below. total depletions for the subject Table B - Depletions Evaporation Lost in Mined Site Name Losses Dust Total Total Lagged Product Control (ac-ft) (ac-ft) (ac-ft) (ac-ft) Stream Depletions Home Office Pit (ac-ft) 32.40 0.00 38.59 70.99 68.33 Overland Ponds Site 0.68 24.62 0.00 25.30 North Taft Hill 26.53 Expansion Site 15.52 0.00 0.00 15.52 15.30 Total 45.76 12.83 51.80 110.38 113.12 Pursuant to 5 37-90-137(11)(b), C.R.S. and 2009CW49, a gravel i does not need to replace depletions that occur due to evaporation from round to January 1, 1981 as a result of open mining of sand and pit operator or property owner whether mining continued after December 31, 1980. This SWSP recognizes g water exposed prior gravel ("pre-81 areas"), regardless of the Home Office Pit as being pre-81 exposure. Of the 100 acres eco acres are as reflected Office the Partners Combined SWSP for their portion oft grazes a total of 100.0 acres at A Ivs reflected SWSP 77.9 acres are recognized as beingwithin Lamb Lake r Water Supply Plans for Sand and Gravel Pits" updated he Home Office Pit. Therefore, for pre-81. Per our General Guidelines for Substitute physical location at which the groundwater was exp sed prior to Januaryr1,8 areas with are tied to the wth the exception