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1! I1? <br />Enron Coal Company <br />Dear Greg, <br />RIO BLANCO COUNTY WEED CONTROL <br />RIO BLANCO COUNTY COURTHOUSE <br />POST OFFICE BOX 599 <br />MEEKER. COLORADO 81641 <br />303 878.5081 <br />November 16, 1990 <br />I am writing this letter concerning the revegetation <br />on the Northern 1, Rienau 2, and the Refuse area in the <br />9 Mile area of Rio Blanco County. The species of noxious <br />weeds in that area are: Leafy Spruge, Canada Thistle, <br />Houndstongue, Mullin, and Bull Thistle. I'm sure all of <br />these weeds were present prior to mining operations. The <br />9 Mile area has the largest concentration of Leafy Spurge <br />in the County and as far as I can tell was introduced into <br />that area in the late 1800's and early 1900's. Disturbance <br />of the ground always encourages propagation of these noxious <br />weeds thus the problems you have been encountering in that <br />area. I would like to address the question of why the <br />grass on the roadside (highway) look healtier than the <br />grass and forbes on the reclaimed area. There are several <br />reasons for this: <br />1. Noxious perenial weeds such as Leafy Spurge and <br />Canada Thistle rapidly out compete the grasses and forbes <br />for water and nutrients in the soil thus suppressing the <br />growth of desirable vegetation. <br />2. With the presence of noxious weeds comes the need <br />for control of those weeds. The best most effective and <br />expedient way of controlling those weeds at this time is <br />herbicides. The noxious weeds mentioned above are all <br />broadleaf plants so are forbes and brushes. Therefore <br />as you treat noxious weeds you will no doubt kill some <br />of these forbes therefore reducing desirable vegetation. <br />Also timing is very critical in treating various noxious <br />weeds (different optimum times for different weeds). <br />Therefore, there will always be some missed. <br />0(01% A- qv