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VI. Revegetation <br />'Compatible with the post- mining latid use `and will meet all the <br />requirement's of Rule 4.44.2(2): <br />.. # s„ . <br />The`Division ..has previously as permanent 21 check dams in the <br />West Ridge and `Center Ridge areas Tl e `check dams in the West <br />- ' :drainage "are coinmorilyreferred to as `the "String of Pearls ". Both <br />, - the'West Ridge and _Center Ridge watercourse are ephemeral. In <br />accordance -with Rules 4.05:3 and 4:05 :4; the spillways are'designed to <br />' pass the peak flow froti'a24= r. storm event of either 10 -yr. <br />recurrence or 25 -yr. recurrence, depending on whether thedrainage area is <br />less than or more than one square mile. <br />The Division has "previously approved the use of introduced species in the <br />reclaination'seed -mix: , The applicant lias'submitted information which <br />shows that the =introduced `species are desirable' and necessary to achieve <br />the approved post- mining land use, and are not poisonous or noxious <br />(Rule 4.15.2): <br />The Division has 'previously approved'the'use'of a cover crop as a means <br />to meet' soil stabilization requirements. Winter wheat was' used as a cover <br />crop'oh'portions: f the West Ridge area fRule 4.15.4). <br />`Methods" to measure herbaceous cover and production; species diversity, <br />and woody plant density are discussed in =Section 4.4 the PAP. These <br />techniques include reference area comparisons. The Division previously <br />approved these' techniques [Rule`4.15.7(1)]. <br />r; <br />On topsoil replaced areas, comparison between disturbed areas and <br />reference areas in terms of covet and productivity will be used to <br />demoiisttrate that the success criteria of Rule 4.15.8 have 'been met. <br />An acceptable species diversityrevegetation standard for topsoil <br />redistribution areas has been approved by the Division. The approved <br />standard states that herbaceous species diversity will require the presence <br />of at'least five species ;with relative importance of each species <br />equal toYor greater than three percent; but less than 40 percent. The <br />m <br />cobined relativeimportarice of five herbaceous species will not exceed <br />75 percent. If thereare'six or rriore'perenriial herbaceous species that <br />satisfy the relative importance requirements; then the inaximum <br />combined relative importance standard Will be'waived. A numerical <br />standard for cool and warm season/forb species was not required, since a <br />diverse permanent reclamation seed ri ixture of pererinial,13redominately <br />native, plants containing cool and warm season grass species and forbs <br />and woody species, was planted. For the two vegetation communities <br />6 Page 3 of Appendix 4.6 -M in Volume l l a of the PAP <br />C1980 -001 Edna Mine Permit Renewal No. 6 °•27 <br />