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' Mleatir8. I:.111[d ;1lld (~ '111.` <br />,. August 'L 9, 198 <br />Page 3 <br />An acceptable method For employing the diversity component in the re- <br />vegetation success evaluation has not at present been finalized, and no <br />objective interpretation has been included in this report. The diversity <br />component will be used in evaluating revegetation success and as soon as <br />test results are available to substantiate the method a full description <br />of the method and its role in determining revegetation success will be <br />forwarded to [he Office of Surface Mining and the State Mined Land Recla- <br />mation 1)ivislon for approval. <br />Special Stipulation No. 17_ states: <br />"12. The applicant shall identify the proposed methods for measuring <br />success on pasturelands and submit a plan for and description of the <br />proposed method by Septenll~er 1, 1980." <br />The Pastureland Vegetation Type occupies approximately 144 acres that <br />will be disturbed by mining. Smooth Brome (Rromus inermis) dominates the <br />area with 84% of the cover and 92% of the production. OE the six vegeta- <br />tion types occurring within tl~e permit boundry, Pastureland contains the <br />least diverse plant community with a diversity index value of 0.428. The <br />remaining five vegetation types have index values of 0.729, 0.955, 1.006, <br />1.034 and 1.286. Plant production (1.788 lbs/acre) and plant cover (44Y,) <br />for the Pastureland Vegetation Type is comparable to adjacent native plant <br />communities (1.487 lbs/acre and 65% cover for Big Sagebrush, and 70, <br />lbs./acre and 41% for low sagebrush). <br />Revegetation success on reclaimed sites will utilize plant cover and <br />production from the Pastureland Vegetation Type but not species diversity. <br />Cover and production will be used as described in Section 816-116, Revege- <br />tation Success. However, because the Pastureland Vegetation Type is not a <br />naturally occurring plant community, species diversity from this type will <br />not be used in calculating the species diversity portion of the success <br />standard. <br />Please contact the undersigned with comments oc questions. Thank <br />you. <br />Sincerely, <br />ENERGY FUELS CORPORATION <br />LE~Z~ <br />R. Parkin <br />Range Scientist <br />CP/lar <br />cc: JAdams, JCooper, <br />GGrandey, MMcCarthy <br />