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.' . STATE OF COLORADO OffiCE OF THE STATE ENGINEER Division of Water Resources Department of Natural Resources 1313 Sherman Street, Room 818 Denver, Colorado 80203 Phone' (3031 866-3581 FAX, (3031 866-3589 November 6, 2001 Bill Owens Governor http://water.state.co.us/derault.htm Mr. Brian Len North West Colorado Consultants, Inc PO Box 775226 Steamboat Springs, CO 80477 Greg E. Walcher Executive Director Hal D. Simpson. P.E. State Engineer . When replying, please refer to: MARTIN CULL DAM CONSTRUCTION FILE NO,: C-694A Water Division 6, DAMID: 540103 SUBJECT: Approval of Plans and Specifications for Construction Dear Mr. Len: Thank you for subll,itting for the review and approval of the State Engineer the plans and specifications for the construction of the proposed rehabilitation and modification of the Martin Cull '. Dam in Moffat County, We have completed our review of the design and construction documents and have found them to be acceptable for construction, We are transmitting one mylar cover sheet of the construction drawings with approval signatures for the construction of this proposed project Our acceptance and approval of these documents are effective as of the date of this letter and contingent on the following item, . Riprap will be installed on the upstream Slope from the crest a vertical distance of ten feet to an elevation of 7490, The gradation of riprap will be approved by this office prior to its placement . A request for the waving of Rule 5.A(7)(c) of the Rules and Regulations was presented in your design documentation, Rule 5,A,(7){c) requires the placement of rock riprap on the entire upstream face of the dam embankment as slope protection to prevent erosion caused by reservoir wave action, The waiver request is for a partial placement of riprap on the upstream dam face from the dam crest down to Elevation 7590, which is ten feet below the crest and 4,5 feet below the spillway, In a letter from Mr. Paul Currier dated October 25, 2001, it states that the upstream face of the dam is in the leeward position and therefore does not suffer much wave action, In our review of the previous inspection reports, wave erosion is evident on the upstream face along the high water line in most of the reports, A modification of this Rule is granted as specified above, based on the aforementioned information and commitment to place additional riprap on the upstream face if warranted, The construction of this project must be performed under the purview of a professional engineer registered in the State of Colorado, Your attention is directed to Rule 9,C, (copy enclosed) of the Rules and Regulations concerning construction observations, coordination and documentation activities required for this small size, Class 3 dam. Please keep Mr. Mark Haynes of our Denver office at (303) 866-3581 Ext, 276 informed of the construction status so he may also meet his obligations under Rule 9.C, .