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• OF C III IIIIIIIIIIIII III <br /> O 999 <br /> o DEPARTMENT OF NATURAL RESOURCES <br /> David H.Getches.Executive Director <br /> 87 MINED LAND RECLAMATION DIVISION <br /> * �876 + DAVID C. SHELTON, Director <br /> Richard D.Lamm <br /> Governor <br /> December 5, 1986 <br /> Mr. John Althouse <br /> Mine Engineer <br /> Keenesburg Mine <br /> P. 0. Box 359 <br /> Keenesburg, CO 80643 <br /> RE: Keenesburg Mine-1986 Vegetation Sampling Results <br /> File No. C-81-028 <br /> Dear Mr. Althouse: <br /> Attached are data summaries from vegetation cover sampling conducted by Dan <br /> Mathews , Mike Savage, and Tom Schreiner during the 1986 field season at the <br /> Keenesburg Mine. <br /> .The spring 1986 seeded area was sampled along with the fenced referenced area. <br /> It will be several years before it can be determined if a successful stand <br /> dominated by warm season perennial grasses has become established, but this <br /> year's data (when compared to the stand that develops over a number of years) <br /> should provide some insight into the competitive interaction between the various <br /> cool and warm season short and tallgrasses. . <br /> The 1978 cover depth test plots were also sampled. The data serves to support <br /> previously noted observations including the fact that, for some reason, warm <br /> season tallgrasses established most successfully on the two foot depth sand <br /> over clay plot rather than the three foot plot which would have been expected. <br /> It is possible that different levels of compaction resulting from plot preparation <br /> work may have affected the result. A similar experiment was initiated in spring <br /> 1986 on actual mine backfill . It is important for Coors Energy Company to closely <br /> monitor the newly established plot on an annual basis in order to record trends <br /> and to allow for reliable interpretation of observed results. <br /> Feel free to call if you have any questions regarding the 1986 vegetation <br /> sampling results. <br /> Sincerely, <br /> Thomas A. Schreiner <br /> Reclamation Specialist <br /> TAS:rl <br /> 423 Centennial Building, 1313 Sherman Street Denver, Colorado 80203 Tel. (303) 866-3567 <br />