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Page 2 of 2 <br />years used to generate the equation, the equation need not be modified by subtracting out certain species. <br />After reviewing the data, the Division believes the 10% relative cover contribution threshold discussed <br />in the review of the 2011 annual report is appropriate to use when determining revegetation success and <br />allows for a fair comparison of the predicted vegetative cover and production success standard amount <br />and the measured amount for a given year. <br />Another option would be to create a predictive equation to estimate the relative cover and production of <br />annual /biennial species for a given year based on precipitation using the Osgood reference area data. By <br />doing this, it might be possible to predict the amount of annuals /biennials (excluding state listed noxious <br />weeds) for a given year to set the allowable contribution threshold. The predicted amount may be higher <br />or lower than the 10% threshold. The Division would then use whatever threshold amount is higher to <br />evaluate reclamation success. <br />In either case, State listed noxious weeds need to be excluded from the data when generating the <br />predictive equations. <br />If you have any questions please feel free to contact me. <br />Sincerely, <br />p o � k& C W-- <br />Jared Ebert <br />Environmental Protection Specialist <br />DRMS <br />CC: Don MacDonald, Coors Energy Company via e -mail <br />