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STATE OF COLORADO <br /> DIVISION OF MINERALS AND GEOLOGY <br /> Department of Natural Resources <br /> 1313 Sherman St., Room 215 <br /> Denver,Colorado 80203 <br /> Phone:(303)866-3567 <br /> FAX:(303)832-8106 <br /> DEPARTMENT OF <br /> NATURAL <br /> DATE: July 23, 1998 <br /> RESOURCES <br /> Roy Romer <br /> Governor <br /> TO: Steve Renner James S Lochhead <br /> Executive Director <br /> FROM: Dan Mathews "� Michael B.Long <br /> Division Director <br /> RE: Coal Basin Noxious Weed Sampling <br /> Attached are vegetation data summaries from the noxious weed reference areas at Coal Basin, <br /> sampled on June 16, 1998. Sampling was conducted by a crew from the OSM Denver office <br /> (Barbara Bowerman, Becci Siegel, Randy Pair, Mitch Rollings), and me. We located and <br /> marked four reference areas within disturbed areas at the mine which have become infested with <br /> noxious weeds. Reference area corners were delineated with orange marked wooden stakes. The <br /> infested areas will be subject to weed control efforts over the next few years. Repeated sampling <br /> of these same reference areas over the next couple of years should provide a quantitative basis for <br /> evaluating treatment success. <br /> Reference Area 41 is a 50m x 35m area on relatively flat topography located immediately to the <br /> west of the Sutey Refuse Pile, within the "V" formed by a ranch road and a pile access road <br /> which diverge at that location. A systematic sample design was used for this and other reference <br /> areas sampled. 10, 35 meter cover transects were run, with 5m spacing between transects. 2 <br /> cover readings were made at 1.5m intervals along each transect, using a tripod mounted ocular <br /> point bar, giving a total of 46 cover points per transect. Live vegetation(current year's growth <br /> on herbaceous vegetation) was recorded by species, along with litter, rock, and bare ground. <br /> Thistle density was estimated by counting thistle plants within a 1x35m belt along one side of <br /> each transect. No attempt was made to differentiate between the various thistle species for the <br /> density estimate. <br /> Reference Area#2 is a 50m x 25m area on the steep west facing slope of the Sutey Pile, near the <br /> southwest corner of the pile. 10, 25 meter cover transects were run, with 5 meter spacing <br /> between transects. Two cover readings were made at 1 in intervals along the transect, for a total <br /> of 50 cover points per transect. Density of thistle species (lumped), and houndstongue <br /> (Cynoglossum off cinale) was estimated for the south '/z of the reference area, by counting <br /> individual plants within 1x25m quadrats along one side of each of the 5 transects within the <br /> south half of the reference area. <br /> Reference Area# 3 is located along the relatively flat surface of a segment of the conveyor <br />