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H. The Division approves the applicant's plan for disposal of debris, acid-forming or toxic materials, or materials constituting a fire hazard in a manner designed to prevent contamination of ground or surface waters. A contingency plan has also been developed to prevent sustained combustion of flammable materials.(4.14.3(1)(a)) The Division approves 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 approves the use of introduced species in the reclamation seed mix. The applicant has submitted information that shows that the introduced species are desirable and necessary to achieve the approved post-mining land use, and is not poisonous or noxious. (4.15.2(3)) B. The Division approves the use of straw mulch as a means to meet soil stabilization requirements. The applicant will 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 compazison of the revegetated communities with extended reference areas. The Division approves of these techniques. (4.15.7(1)) D. Compazisons between reclaimed and undisturbed areas, in order to demonstrate that success criteria of 4.15.8, 4.15.9, or 4.15.10 have been met, will be based on the following: For grassland 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 cone-sided T-test. No woody stem density standard 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 comprise 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 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 comprise 5% of total ]ive vegetative cover excluding annual weeds. 21