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I^ <br />April 28, 2015 <br />CITY of ARUADA <br />UTILITIES DEPARTMENT <br />FACSIMILE: 720-898-7603 ♦ TDD: 720 - 898 -7869 <br />PHONE: 720 - 898 -7760 <br />Michael Cunningham <br />Division of Reclamation, Mining and Safety <br />Colorado Department of Natural Resources <br />1313 Sherman St, Room 215 <br />Denver, CO 80203 <br />Re: Permit #M- 1983 -139, Leyden Pit <br />Reclamation Plan Technical Revision <br />Dear Mr. Cunningham: <br />RECEIVE <br />MAY 0 i 201° <br />DIVISION OF RECLAMATION <br />MINING AND SAFETY <br />This letter serves as a request to allow the following revisions to the final reclamation plan for Leyden <br />Pit, Permit #M- 1983 -139. These changes are necessary as a result of conversations with Division <br />Inspector Peter S Hays during a November 21, 2013, inspection and due to the City of Arvada's <br />intention to construct reservoirs on the Leyden Pit property in the future for additional water storage <br />capacity. <br />The following revisions are proposed because of the temporary nature of the final reclamation: <br />• All slopes will be graded 3H:1V or less; no slopes greater than 3H:1V will remain. <br />• Old sediment ponds will be backfilled or breached to achieve positive drainage. <br />• All internal access roads within the site will remain as is. <br />• Growing medium such as topsoil will be installed 2" —4" in depth. <br />• Buffalo Brand Sharp's Dryland Pasture Mix seed is proposed for reclamation of the pit. A <br />description of the proposed seed mix is attached for your consideration. <br />In addition to the revisions noted above, we request that a small pond, which is located southwest of <br />the sediment ponds, known as Coors Pond, remains as is. According to the Colorado Department of <br />Natural Resources, Division of Water Resources' "General Guidelines for Substitute Water Supply Plans <br />for Sand and Gravel Pits" updated April 1, 2011, supporting information must be submitted that shows <br />"the extent and location of any ground water surface area exposed to the atmosphere prior to January 1, <br />1981." The attached 1980 aerial photography shows that this pond existed pre -law, prior to January 1, <br />1981. <br />,* AF & Report <br />No Violations <br />11.0. Box 8101 ♦ 8101 RALSTON ROAD ♦ ARVADA, COLORADO ♦ 80001-8101 <br />