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_ .:,~. STATE OF COLORADO MINED LAND RECLAMATION DIVISION Department of Natural Resources 1313 Sherman St ,Room 215 Denver, CO 80203 303 866-3567 RAx 303 632 8106 DATE: April 21, 1992 of ~~~ ~``,~~ ~e~ i 1 V (ry' ~ X676 ~ Roy Romer, Gwemor Michael B. Long, Division Director TD: Christine John`st~on FROM: Steve Shuey /~ RE: Blue Ribbon Mine, Permit No. C-81-047, Vegetation Monitoring Report I have reviewed the "Year 5" Vegetation Monitoring Report for Blue Ribbon Mine submitted to MLRD February 18, 1992. The mine site is split Into two areas, a riparian area and a grassland area. These areas are inturn split into two areas, the east and west riparian areas and the slope and flat grassland areas. There are four success criteria for revegetation. Percent Cover, Production, Woody Stem Density and Species Diversity. Cover, production and woody stem density must ali meet sample adequacy. That means the success standard for each must be met within a statistically derived number of samples (5-15). In this report, none of the parameters were sampled to adequacy in either the grassland or the riparian area except for the percent cover in the grassland. After viewing the mine site, I believe that sample adequacy for cover can be met in both areas by redesignating the east riparian area as grassland. Its vegetative cover more closely resembles the grassland. Productivity in both areas will probably not meet sample adequacy until a few more growth years have passed. Productivity data would be better if the lm2 quadrat was used in sampling (as described in the permit) instead of the .25m2 quadrat used for this monitoring. Woody stem density is rarely ever sampled to adequacy due to the small numbers of stems/ac. required and the "patchiness" of shrub establishment. Successful revegetation is defined as meeting 907, of each success standard Dr~e~ r~ delineated in the permit. Success standards are the same for 4over~ ands y production for b~th vegetative communities. ~~ody S}~M pans,+y s~4.,~~ds o,ce cor-rrnunr~y Spec, c. In the grassland community cover averaged 33.87 and needs to achieve 39.97. to meet the 907 of standard. This should be attainable in years nine and ten of the liability period. Production for the community averaged 1397 lbs/ac. and needs to achieve 1606 lbs/ac. which should be no problem by years nine and ten of the liability period. Woody stem density for the community averaged 119 stems/ac. which exceeds the standard of 100 stems/ac. Species diversity for the grassland meets all but one requirement. There is only one established cool season bunch grass species instead of the required three species.