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~Si G~~ <br />Mr. Thomas Schreiner <br />Environmental Protection Specialist <br />Division of Reclamation, Mining and Safety <br />1313 Sherman Street, Room 215 <br />Denver. CO 80203 <br />RE: Adequacy Review -Corliss Sand Pit <br />M-2007-001 ~/ <br />Dear Mr. Schreiner: <br />40586 Co. Rd. 21 <br />Haxtun, CO 80731 <br />February 5, 2007 <br />/EE8 0 6 ?007 <br />~~~nnn ~m on of Reclamation, <br />~ f/~n~n9 and Safety <br />I am providing a response to your letter of January 16, 2007 and the adequacy concerns <br />regarding the Corliss Sand Pit. I am showing the questions raised as you presented them. <br />The responses are in bold. <br />6.3.3 EXHIBIT C -Mining Plan <br />1. In conformance with Rule 6.3.3, please clarify the maximum disturbance to be <br />expected at any one time throughout the life of the operation, i.e.: maximum pit <br />dimensions & depth, maximum volume of overburden to be stockpiled, maximum <br />volume of topsoil to be salvaged and stockpiled for reclamation, and maximum <br />number of acres to be re-vegetated. <br />We would anticipate that the maximum disturbance open at one time will be about 2 <br />acres. That would encompass are area approximately 300' x 300' x 20' in depth. <br />Overall maximum pit dimensions will be approximately 657' by 657' as shown on <br />the original Mining Plan drawing. In the original application we indicated that the <br />top 4-5 feet below the topsoil is not suitable for manufacturing concrete. However, <br />it will be mined and sold for landscaping or other construction purposes. There is <br />no intent of any stockpiling of this overburden. The estimated 4" of topsoil at the <br />site will be stockpiled as each area is opened. The maximum volume of that <br />stockpile is anticipated to be about 5300 cubic yards. All of that stockpile will be <br />salvaged for use in reclamation. Then entire 9.9 acres will be re-vegetated during <br />reclamation. <br />2. The applicant specifies that the water table below the site is approximately 25-30 <br />feet and that the anticipated mining depth will be 20 feet. Please commit to <br />limiting the excavation to no more than two (2) feet above the groundwater <br />surface, and to immediately backfilling any exposed groundwater if encountered <br />throughout the mining operation. <br />