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`b Y <br />IV. Revegetation <br />The Division proposes to approve the use of introduced species in the <br />reclamation seed mix. The applicant has submitted information which <br />shows that the introduced species are desirable and necessary to <br />achieve the approved post-mining land use, and are not poisonous or <br />noxious. To convert the land to rangeland uses with warm season <br />emphasis, two species have been introduced. They are sideoats grama <br />and yellow Tndiangrass. (4.15.2). <br />2. The Division proposes to approve the use of sorghum mulch as a means <br />to meet soil stabilization requirements. See Minor Revisions 2 and <br />6. (4.15.4). <br />3. Methods to measure herbaceous cover and production, species diversity, <br />and woody plant density are discussed in Section 2.04.10(4) - Plant <br />Community Measurements. For this permit, there is no minimum <br />requirement for woody stems per acre. The Division proposes to <br />approve of these techniques. (4.15.7(1)). <br />4. To demonstrate that success criteria of 4.15.8, 4.15.9, or 4.15.10 <br />have been met, the criteria will be: species diversity and <br />herbaceous cover and production in comparison between the undisturbed <br />reference areas and reclaimed sites. Species diversity will be <br />considered successfully reestablished if a minimum of seven perennial <br />species: four (4> warm season grasses, two (2) cool season grasses <br />and one (1) forb are present. No one species should comprise a <br />relative importance of greater than 40 percent or less than three <br />percent. <br />Herbaceous cover and production standards shall be met when the <br />reclaimed sites exhibit at least 90 percent cover as compared to <br />reference areas at a 90 percent confidence interval measured for two <br />consecutive years.. <br />The Division proposes to approve the basis for this comparison. <br />5. The Division proposes to approve of the reference areas which the <br />applicant has selected based on the requirements of Rule 4.15.7(3). <br />6. The reference areas will be utilized to determine revegetation <br />success in a manner which the Division finds acceptable. 4.15.7(4)). <br />SES/ern/yjb <br />1305E <br />3/10/92 <br />-15- <br />