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annual and biennial cover averaging 35.2%. Dominant taxa were cheatgrass, fourwing saltbush, and <br />snakeweed (Gutierrezia saroth~ae) with 35.1%, 10.7%, and 3.4% average cover, respectively. This unit <br />fails the revegetation success criterion of 90% of the Greasewood Reference Area value when both <br />annual and perennial cover values are combined. It also fails when only perennial cover is compared. <br />The Cameo Borrow Area No. 1 currently passes three of the four diversity standards. There is <br />sufficient cover of perennial forbs or sub-shrubs and perennial cool-season grasses to pass the required <br />minimum values, and there are no planted species with greater than 70°k relative cover. However, the <br />present relative cover of perennial warm-season grasses (0.76%) is insufficient to pass the required <br />minimum value (2.0%). <br />3.7 Substation B <br />~ Ground cover of the Substation B area consisted of 39.9% live vegetation, 8.9% rock, 9.5% litter, <br />and bare soil exposure of 41.7%. Perennial cover across the unit averaged 20.7% with annual and <br />biennial cover averaging 19.2%. Dominant taxa were cheatgrass, forage kochia, Russian wildrye <br />(PSathyrostachys junceus), and fourwing salthush with 18.0%, 8.3%, 3.1%, and 2.2% average cover, <br />respectively. This unit fails the revegetation success criterion of 90% of the Shadscale Reference Area <br />value when both annual and perennial cover values are combined. However, it passes when only <br />~ perennial cover is compared. <br />The Substation B area currently passes all four diversity standards. The present relative cover of <br />perennial warm-season grasses, perennial forbs or sub-shrubs and perennial cool-season grasses is <br />sufficient to pass the required minimum values, and there are no planted species with greater than 70% <br />relative cover. <br />3.8 2 West Portal -East <br />Ground cover of 2 West Portal -East area consisted of 21.6% live vegetation, 34.0% rock, 15.3% <br />litter, and bare soil exposure of 29.1%. Perennial cover across the unit averaged 12.1% with annual and <br />biennial cover averaging 9.5%. Dominant taxa were cheatgrass, shadscale, fourwing saltbush, and <br />rubber rabbitbrush (ChrysoUramnus nauseosus) with 9.4%, 5.6%, 1.4%, and 1.3% average cover, <br />respectively. This unit fails the revegetation success criterion of 90% of the Shadscale Reference Area <br />value when both annual and perennial cover values are combined. However, it passes when only <br />perennial cover is compared. <br />CEDAR CREEK ASSOCIATES, INC. Page 16 SNOWCAP COAL COMPANY <br />Revegetation Evaluation - 2006 <br />