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<br />less than mature growth stage of the revege[ation at 3 to 5 yeazs through multiplying by a <br />factor of 0.5. <br />4) A soil productivity adjustment was also made by multiplying by a factor oti 0.8 (a 20% <br />reduction is assumed for the anticipated 3 to 5 year revegetation evaluation period). This <br />adjustment was made to compensa[e for impacts to soil structure resulting from salvage and <br />reconstruction handling and volume losses, which affect productivity capability. Please <br />note that potential soil productivity can be expected to recover as post-disturbance <br />pedogenic processes develop. <br />Total Plant Ground Cover success standards for the Foothills Swale, Foothills Pinyon/Juniper, <br />Rolling Loam, and Dry Exposure range sites a[ the Piceance Site and for the Alkaline Slopes <br />and Rolling Loam range sites a[ the Parachute Site are presented in Table 13. The Total Plant <br />Ground Cover values contained in the table represent values that are 40% of the respective <br />expected average mature reclamation plant community's total ground cover. <br />Total Plant Ground Cover Standard =mature plant community ground cover value <br />X 50% vegetation maturity factor <br />X 80% soil productivity factor <br />= 40% <br />It may be necessary to adjust these values for loc.°1 conditions at the Yankee Gulch Project <br />because: <br />• Productivity values were derived from county-wide data (local vegetation communities may <br />vary from the average, especially when disturbance areas are relatively small); <br />• Field experience and a limited data base were used to develop the productivity-cover <br />nomograph relationship for this site, and <br />• The relationship between productivity and plan[ cover may vary significantly from one <br />vegetation community to another. <br />(f future adjustments are deemed appropriate, they may be accomplished by conducting Total <br />Plant Ground Cover calibration surveys in the range sites prior to their disturbance or in <br />adjacent similar range sites followmg~disturbance. <br />A Habit Diversity goal has also been indicated for each range site (Table 13). For each range <br />site, diversity goals have been set that represent the relative contribution of each plant habit <br />(i.e., grasses and grass-like plants, Corbs and woody plants) that may be expected to occur in <br />the vegetation community being re-established within the success evaluation time of 3 to 5 <br />years. The Habit Diverstty goal values indicated in the table represent percent contribution to <br />total vegetation cover. Diversity information recorded with Total Plant Ground Cover <br />measurements will be used to characterize inter-habit and inva-habit plant diversity. <br />The Habit Diverstty percentage values for each plant habit have been derived From the <br />composition of their respective mature range site plant communities. The composition <br />percentage values in the table have been adjusted to favor grass and grass-like species by <br />multiplying the forb and woody component by ~0%. since newly replaced topdressing <br />materials tend to favor their growth for ~+ years after reconstruction. The reduction values for <br />Corbs and woody species have been added to the mature composition value for grass and grass- <br />like species to amve at the Habit Diversity goal value. The goals contained in Table l3 <br />amencan Soda. L.L.P. 5- l4 <br />tiail Conservaz~on. Plosion and Scdimcnt <br />Convol. ~eclamauon and Reveeeuuon Plan <br />(k~o6cr -'tl, 1998 <br />Reused Apnl 9. 1999 <br />