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C = .2 (grass cover at 20 percent) <br />P = .25 (contour stripping) <br />A = (75) (.28) (.31) (.2) (.25) <br />A = .33 tons/acre/year <br />The "T value" for Table Mountain Loams is 5 tons/acre/year. <br />Therefore, a 20o vegetative cover producing .33 tons/acre/year <br />would be an acceptable management level. <br />Active areas will be evaluated using the following criteria: <br />Cover. Herbaceous cover shall be greater than or <br />equal to 90% of the reference area cover (or <br />other approved cover standard). Comparisons <br />will be made with results valid at the 90% <br />confidence level, using a one-sided test <br />with a 0.10 alpha error probability. <br />Production. Herbaceous production shall be greater than <br />or equal to 900 of. the reference area <br />production. Comparisons will be made with <br />the results valid at the 9oe confidence <br />level, using a one-sided test with 0.10 <br />alpha error probability. <br />Diversity. Species diversity will be deemed adequate <br />when the reclaimed lands consist of a <br />minimum of 2 cool season grasses, 2 warm <br />season grasses and 1 forb. These species <br />shall comprise at least Sa, and no more than <br />60e relative cover and shall consist of <br />perennial non-noxious species. <br />Woodv Plant Density. The woody plant density standard for the <br />wildlife habitat (upland) is 1,000 <br />trees/shrubs per acre. The woody plant <br />density standard for the wildlife habitat <br />(riparian) is 1,742 trees/shrubs per acre. <br />The Division has stipulated "seeding windows" (Stipulation 23) <br />for New, Elk operations. These windows are between August 15 to <br />November 15 and April 1 to May 15. Basin believes the optimum <br />seeding time is between May 15 and June 1 just prior to the summer <br />thunderstorms. This is based on general observation, Middle Fork <br />flow patterns and precipitation records of the New Elk Mine. Basin <br />requested and received approval from the Division to extend the <br />spring seeding window to June 1, rather than May 15. <br />(Revised 11/14/88) <br />(Revised 11/28/88) <br />(Revised 04/15/94) <br />(Revised 12/15/94) <br />Page 2.05-47(c) <br />