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Demonstration Area #2 <br />Demonstration Area #2 is located in the southern portion of Mine 3, and is comprised of <br />• some 57 acres of reclaimed land. Of this, 6 acres were seeded in 1986, 3 acres in 1987, <br />and the remainder (which surrounds the 1986 seeding) was seeded in 1983. <br />The area-weighted average of the ECCS evaluations for the parcels within Demonstration <br />Area 2 yielded an average condition value of 28, which places the area into the sli h <br />erosion condition class. However, the Native Pasture Reference Area (which is only some <br />1500 feet to the north) is possessed of nearly identical slopes, and has an ECCS value <br />of 22, which also places it in the sli h erosion condition class. <br />The USLE calculation, utilizing a topographic factor of 8.25 (~ erage slope length 400 <br />feet, average slope gradient 20%) and a cropping factor of 0.07 (0.065 by interpolation <br />using average standing cover of 40%, and 58% ground cover) yields a calculated soil loss <br />of 5.60 Tons/Acre/Year for Demonstration Area #2. In comparison, the native pasture <br />reference area, utilizing a topographic factor of 9.5 (20% slope, with 600 ft slope length) <br />and a cropping factor of 0.08 (Appreciable brush, 50% grass dominant canopy and 40% <br />• ground cover/litter) yield a calculated soil loss) of 7.30 Tons/Acre/Year from the Native <br />Pasture Reference Area. If (for comparison) the same topographic factor of 8.25 is used <br />for both areas, the calculated soil loss from the Native Pasture Reference becomes 6.34 <br />Tons/Acre/Year. This value is still greater than that calculated for Demonstration Area <br />#2. Therefore, CYCC feels that Demonstration Area #2 meets the criteria of Rule <br />4.05.121. <br />• <br />TR 90-06 Exhibit 3 - 48 Revised <br />