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• BALAZ 8t ASSOCIATES, INC. <br />203 Sunset Circle Palisade, Colorado 81526 Phone/Fax: (970) 464-7942 <br />June 5, 1997 <br />Mr. William ). Carter <br />Division of Minerals and Geology <br />1313 Sherman Street, Room 215 <br />Denver, Colorado 80203 <br />Re: Technical Revision No. 29 Review Response <br />Permit No. 81-022 <br />Dear Bill: <br />Oxbow Carbon & Minerals, Inc. is submitting this response to the Division's review letter dated <br />May 8, 1997, for the above referenced technical revision. This response addresses review item <br />numbers 17, 18, and 24. <br />• Item 17 -Commitment From operator to adhere to recommendations of Lincoln DeVore and <br />stability analysis at requested road stations. <br />Oxbow Carbon & Minerals, Inc. intends to follow the recommendations of Lincoln DeVore for <br />the construction of the West Valley Fill and Haul Road based on its understanding of the field <br />conditions. Variance from the assumed conditions may require that the design criteria be <br />modified during construction. These field modifications will be done with input from Lincoln <br />DeVore and Balaz & Associates, Inc. <br />Lincoln DeVore has analyzed the slope stability at the following sections West Valley Haul Road <br />8+00', 10+00', 17+00', 27+00', Sediment Pond Road station 15+00', Elk Creek Section station <br />33+00' and Cemetery Road station 1+00'. Oxbow Carbon and Minerals, Inc. has added section <br />8+00' on the West Valley Haul Road due to its proximity to the Somerset Cemetery. The road <br />alignments have been revised by Balaz & Associates, Inc. to minimize the cut and fill requirements <br />and to provide the bench widths required by Lincoln DeVore on the Sediment Pond Road. The <br />Cemetery Road alignment has been modified to provide a l5% road between the cemetery and the <br />culinary water tank. This new alignment eliminates the loop around the water tank to get to the <br />cemetery. The stability analysis for these sections indicate factors of safety that range from <br />1.7-1.8 for the fill slopes and 2.4 for the cut slopes. The attached report from Lincoln DeVore <br />provides a detailed discussion and the slope stability calculations. <br /> <br />