Laserfiche WebLink
Ms. Jennifer S. Lindhal Page 2 <br /> June 8, 2016 <br /> This combined SWSP submittal addresses the projected depletions from the Morton Lakes and <br /> Holton Lakes sites, expected operations from April 1, 2016 through December 31, 2017. Mining of the <br /> Morton Lakes site in combination with the adjacent Holton Lakes Mine is expected to last ten to <br /> fifteen years. The proposed replacement of depletions for these sites will come from a lease of fully <br /> consumable water from the City of Aurora. <br /> Morton Lakes <br /> The Morton Lakes Mine is located in the SE 1/, of Section 1, and the NE1/4 of Section 12, all in <br /> Township 1 North, Range 67 West of the 6`h P.M. The sand and gravel operation is west of the South <br /> Platte River near the City of Fort Lupton as shown on the attached Figure 1. The depletions that <br /> result from the mining operation over the period of this SWSP include evaporation from exposed <br /> ground water, dust suppression, dewatering, water lost with the mined product and a first fill of the <br /> northern portion of Stage 1. <br /> The southern portion of Stage 1 was completed in 2015 and was allowed to fill with water in <br /> November 2015, exposing approximately 5 acres. RMCC plans to dewater and mine the northern 12- <br /> acre portion of Stage 1 from April 1 through September of 2016, exposing not more than 1 acre in the <br /> dewatering trenches. The pit will continue to be dewatered until spring 2017 at which time the <br /> dewatering wilt cease and the pit wilt be filled to a total surface area of 16.9 acres. Upon <br /> completions of Stage 1, RMCC will begin mining and dewatering of Stage 7, around September 2016. <br /> Stage 7 (shown on attached Figure 2) is expected to expose 2 acres of ground water during <br /> dewatering and mining. Mining of Stage 7 is expected to be completed by July 2017 , however the <br /> site will continue to be dewatered until free river conditions exist to allow the pit to be filled <br /> without augmentation replacement requirements. The dewatering of Stage 7 is not anticipated to <br /> stop during this SWSP approval therefore the first fill volumes and tagged dewatering depletions of <br /> Stage 7 are not included in this SWSP. If RMCC opts to discontinue dewatering during the period of <br /> this SWSP additional replacement water will need to be obtained from the City of Aurora or another <br /> approved augmentation supply to replace the first-fill depletions of Stage 7 and an amended SWSP <br /> must be obtained. <br /> Holton Lakes <br /> The Holton Lakes Mine is located in the SW '/, of Section 6, and the NW1/4 of Section 7, all in <br /> Township 1 North, Range 66 West of the 6`h P.M. The South Platte River runs through the property. <br /> The Holton Lakes property is outlined on the attached Figure 1. Figure 1 also outlines Stage 1 and 7 <br /> (Morton Lakes) and Stage 2 (Holton Lakes). Stage 2 is located east of the South Platte River and <br /> mining is expected to begin following the completions of Stage 7, in July 2017 and to be completed <br /> by spring 2018. Stage 2 is expected to expose 2 acres of ground water during dewatering and mining, <br /> but will be backfilled with overburden from Stage 7 and will result in no permanent surface areas or <br /> first fill depletions. The depletions that result from the mining operation over the period of this <br /> SWSP include evaporation from exposed ground water, dust suppression, dewatering, and water lost <br /> with the mined product. <br />