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acre waterhshed were ~ineated on Map 28-2 (TR 87-~2), tlatural Gully <br />Density on Unmined Areas. As measured, approximately 15,700 linear feet of <br />• gullies exist on the designated area which represents 39 feet per acre. As <br />shown on Table 28-1, Gully Density, the 39 feet per acre ratio is larger <br />than the average ratio of permanent drainageways proposed for Mine 1 and <br />Eckman Park; for 2225 reclaimed acres, the drainage density would be about <br />36 feet per acre. <br />Based upon tfre study, Colorado Yampa Cual Company provided a <br />demonstration that gully formation is a natural geomorphic process in the <br />vicinity of Mines 1, c", and Eckman Park. It is apparent that active erosion <br />occurs en undisturbed native areas which are well managed and have similar <br />soils and vegetation as found on CYCC's reclamation. Rilling and gullying <br />occurring within reclamation is a natural aeorrorphic process and is <br />consistent with the post-mining land uses. Additionally, Colorado Yampa <br />Coal Company leas given an adequate demonstration to indicate the proposed <br />permanent drainageway density within reclamation is roughly equivalent to <br />the drainage density of similar, undisturbed areas. The locations of <br />proposed and existing permanent drainageways within the C-81-071 permii are <br />• shown on Map 28-3 (TR 87-14-3), Existing and Potential Permanent Drainac,•eway <br />Locations. <br />As indicated by the September 1985 approval, the Givision concurs with <br />Colorado Yampa Cual Company's contention that rilling and gullyir:y within <br />reclamation is a natural geomorphic process. Furthermore, it ryas agreed <br />that the proposed density of permanent drainageways is consistent with <br />existing densities of surrounding undisturbed areas. <br />n <br />U <br />28-8 <br />