2015-06-16_REVISION - M1983139 (3)

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June 11, 2015 CITY oFARUADA UTILITIES DEPARTMENT FACSIMILE: 720-898-7603 ♦ TDD: 720-898-7869 PHONE: 720-898-7760 Michael Cunningham Division of Reclamation, Mining and Safety Colorado Department of Natural Resources 1313 Sherman St, Room 215 Denver, CO 80203 Re: Leyden Pit; Permit File No. M-1983-139; Technical Revision No. 3 (revision) Reclamation Plan Technical Revision Dear Mr. Cunningham: In March, a Technical Revision request was submitted for the final reclamation plan for Leyden Pit, Permit #M-1983-139. On May 8th, we received a response from you requiring additional information be provided to grant the Technical Revision. The following is being provided and submitted for your consideration. Change in Future Use of the Leyden Pit: The City of Arvada desires to construct a reservoir on the Leyden Pit property for future water storage capacity. The 100 acre reservoir would essentially cover most of the area currently disturbed. Additionally, the future Jefferson Parkway will be constructed through the northwestern corner of the site, which is the remainder of the area currently disturbed. All slopes will be graded 3H:1V or less; no slopes greater than 31-1:1V will remain. The attached revised Reclamation Map is being provided to show that all slopes will be regraded to 3HAV or less. Regrading to 31-1:1V rather than 7HAV is proposed because this area will be the site of a future water reservoir that will require a change in grade to accommodate the desired water capacity. The small pond located southwest of the sediment ponds known as Coors Pond, remains as is. We could not satisfy the requirement to obtain written documentation from the Office of the State Engineer that they agree Coors Pond was exposed prior to January 1, 1981, in time for this Technical Revision deadline of June 15th. This will need to be addressed in a later revision once documentation from the State is obtained. P.O. BOX 8101 ♦ 8101 RALSTON ROAD ♦ ARVADA, COLORADO ♦ 80001-8101