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plan has also been developed to prevent sustained combustion of flammable materials.(4.14.3(1)(a)) The Division proposes to approve the method and design specifications for covering of acid-and toxic-forming materials in order to prevent leaching into surface and ground water and to insure backfill stability.(4.14.3(2)) XI. Revegetation A. The Division proposes to approve the use of introduced species in the reclamation seed mix. The applicant has submitted information which shows that the introduced species aze desirable and necessary to achieve the approved post-mining land use, and are not poisonous or noxious. The introduced species is Winter rye, which is included to act as a nurse crop until the perennial species become established. (4.15.2(3)) B. The Division proposes to approve the use of straw mulch as a means to meet soil stabilization requirements. The applicant proposes to use a interim seed mix (Table 2.05.4-4) for areas that will be temporarily revegetated. (4.15.4) C. Methods to measure herbaceous cover and production, species diversity, and woody plant density are discussed in section 2.05.4 of the permit. These techniques include comparison of the reveoetated communities with extended reference aeeas. The Division proposes to approve oFthesetechniques.(4.15.7(1)) D. Comparisons between reclaimed and undisturbed areas, in order to demonstrate that success criteria of 4.15.8, 4.1.9, or 4.1.10 have been met, will be based on the following: For grassland aeeas, success will be demonstrated for cover and production when the reclaimed area is at least 90 % of the reference area and meets the 90% confidence interval using aone-sided T-test. No woody stem density standazd will apply to grassland areas. Species diversity standards are 2 cool season grasses and 1 warm season grass comprising 5 to 30 percent of total live vegetative cover excluding annual weeds. One perennial forb should compromise 5% of total live vegetative cover excluding annual weeds. For oak/pinyon areas, success will be demonstrated for cover and production when the reclaimed area is at least 90 % of the reference area and meets the 90% confidence interval using aone-sided T-test. The woody stem density standard is 500 stems per acre. Species diversity standards aze 2 cool season grasses and 1 warm season grass comprising 5 to 30 percent of total live vegetative cover excluding annual weeds. One perennial forb should compromise 5% of total live vegetative cover excluding annual weeds. 30