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Mr. Darry Ferguson -4- February 18, 1993 9. A demonstration that the berm around Topsoil Pile 2 can contain a 25 year event to prevent topsoil loss must be made in order for it to qualify the area as a small area exemption. Another alternative is to grade the berm around the topsoil pile so that any runoff that spills over the berm will be directed into the west fill downdrain. Vegetation and Soils: 1. The seed mix is still incorrect. The first submittal had headings titled; pounds of bulk seed/acre, Pounds of pure live seed/acre, and cost/pound of the seed. It was pointed out that the seed mix was way too heavy and that the same species could be used, just in lower proportions. The operator submitted a mix that now contains numbers under a heading of lbs./ft P.L.S. Please submit a new table using the same species and the pounds of P.L.S./acre that will provide for a final mix that contains 40-50 pure live seeds/sq.ft. The amount of bulk seed is really not important at this time because purity of seed is subject to change and when they actually go to make up the mix the purity may not be the same as it is today. 2. The Division requires a success standard for vegetative growth and proposes the following standards that we feel are acceptable. Oakridge Energy may submit their own standards for review, but in either case, please include the standards in the appropriate section of the text. Diversity: Two warm season grasses, two cool season grasses and one perennial forb each contributing to at least 3% but not greater than 40% relative cover. Vegetative cover: The cover standards should be a direct comparison of the reference area and should be 90% of the reference area with 90% statistical confidence. Herbaceous production: This should also be a reference area comparison at 90% of the reference area with 90% statistical confidence. Wood plant density: This shall be as the operator proposed at 1000 stems/acre. The operator should also provide a discussion about what methodology will be used to collect data and the statistical comparison to be utilized to prove success.