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5731 State Highway 13 <br />Meeker, Colorado 87641 <br />(303) 924-4451 <br />Mr. Dan Mathews October 17, 1984 <br />Colorado Mined Land Reclamation Division <br />423 Centennial Building <br />1313 Sherman Street <br />Denver, CO 80203 <br />SUBJECT: Technical Revision - Addition of Temporary <br />Diversion Structure & Diversion Ditch to <br />Water Suooly Retention Area <br />Dear Dan: <br />The attached information is <br />Revision to the Colowyo Mining Permit <br />and utilize a diversion structure and <br />water supply retention pond located i <br />is in accordance with my conversation <br />12, 1984. <br />submitted as a request for a Technical <br />No. C-019-81. The request is to construct <br />associated diversion ditch at the existing <br />i the Taylor Creek Drainage. This request <br />with you and Candy Thompson on September <br />This request is submitted as a Technical Revision in accordance with <br />• Rule 2.08.4 Revision to a Permit, since the diversion structure and diversion <br />ditch constitutes an additional regulated facility. <br />ENVIRONMENT: <br />The proposed location is adjacent to the paved access road from the <br />pit to the loadout area. The environment of the area is described in the <br />Colowyo Permit. The location is described as situated in the NWlj4 of Section <br />27, T4N, R93W, 6th P.M., as shov+n on the enclosed map, Proposed Taylor Creek <br />Diversion System. <br />BACKGROUND: <br />The Taylor Creek Pond was in existance prior to commencement of the <br />Colowyo operation, and was used for stock watering. Since 1979, Colowyo has <br />used the pond as a part of its water system. Colowyo's use of the pond has <br />consisted of storing runoff water and water pumped from the Wilson Reservoir. <br />Prior to 1984, sediment buildup in the Taylor Creek Pond was not excessive. <br />F'~wever, during the Spring runoff of 1984, sediment built up level with the <br />spillway during about a two week period, and the sediment concentrations of <br />Taylor Creek continue to be excessive. Above normal precipitation the past <br />several years has caused natural land slides and increased erosion along the <br />banks of Taylor Creek, resulting in a significant increase in sediment concen- <br />trations. It appears that the natural erosional processes will continue for <br />years to come, creating operating problems for the o-+ater system. The results <br />of the high sediment loads are decreases ire water storage capacity and malfunc- <br />tions at pumping and filtering stations. In addition, there is currently no <br />• ans to dewater the pond to perform maintenance on the inlet/outlet structure <br />i_~r the pumps, or to dredge the pond to desired capacity. <br />