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STATE OF COLORADO <br />DIVISION OF RECLAMATION, MINING AND SAFETY <br />Department of Natural Resources <br />1313 Sherman 6[., Room 215 <br />Denver, Colorado 80203 C O L O R A D O <br /> <br />Phone: (303) 866-3567 DIVISION OF <br />RECLAMATION <br />FAX: (303) 832-8106 M I N I N G <br /> - &- <br /> SAFETY <br /> Bill Ritter, Ir. <br /> Governor <br /> INTEROFFICE MEMORANDUM Harris D. Sherman <br /> Executive Director <br /> Ronald W. Cattany <br /> Division Director <br /> Natural Resource Trustee <br />DATE: July 13, 2007 <br />TO: Joe Dudash <br />FROM: Dan Mathews <br />RE: Blue Ribbon Mine (Permit C-1981-047) <br /> Year 9 Vegetation Report <br />I have reviewed the report Phase /I/Bond Release Evaluation-Year 1 of 2 (2006 <br />Revegetation Success Evaluation, Blue Ribbon Mine), prepazed by Cedar Creek <br />Associates, Inc., dated March, 2007. <br />This is an excellent report with sampling methods and statistical procedures clearly <br />documented. Data and analyses are properly presented in tables, supported by narrative <br />discussion, charts, and photographs. Sampling protocol and statistical procedures were in <br />conformance with permit requirements. Year 1 success was demonstrated for all <br />parameters. Cover and production success was demonstrated for both revegetated <br />communities (grassland and riparian) using the stringent "reverse null", one sample t-test. <br />Sample adequacy was demonstrated for each community and each parameter, in both <br />reclaimed and reference areas (as such, t-testing was actually not necessary to <br />demonstrate success). <br />Year 1 diversity success was properly demonstrated for each community. <br />Woody Plant density success demonstrations appear to conform to the approved <br />permit requirements, but do not fully comply with applicable requirements of Rule <br />4.15.11, which became effective in November of 2005, after the sampling and <br />statistical evaluation TR plan was approved, but before the sampling was <br />conducted. <br />For the grassland community, the approved plan allowed for a complete census count, as <br />an alternative to sampling, using a well defined protocol to ensure an accurate count. The <br />Office of Office of <br />Mined land Reclamation Denver Grand Junction Durango Active and Inactive Mines <br />