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E. Fertilization and Weed Control -Manure will be spread on the prepared surface at the rate of 20 tons per acre; or nitrogen (N) and phosphorus (P2O5) fertilizer will be applied and incorporated at a rate of 40 lbs. per acre each. Time of application will be immediately prior to seeding. If manure is applied, the manure will be of a type that has 60% or more, by weight, heavy chunks 5 inches or more in diameter. Granular or powdery manure will not be used. If nitrogen and phosphorus are applied, a native hay or straw mulch will be spread and crimped into the soil at a rate of 4000 lbs. per acre after fertilizing. Mulch will be crimped into the soil in such a way that 6 inches of mulch protrudes from the soil surface. These measures will help control wind and water erosion until the grass becomes established. Weed control will be accomplished on the site during grass stand establishment. Weed control may be chemical or mechanical. Mowing shows best results when completed between mid June and early July. No grazing will be allowed during the first two years of establishment. After this period, the success of the seeding will be evaluated. If a lush stand is present, grazing may begin. If it is determined that an insufficient stand of grass is present, the area will be seeded again. F. Seeding. The species to be seeded and the seeding rates are listed in the Table shown in Item "C". These species were selected in conjunction with Soil Conservation Service recommendations, based on species compatibility with the climate, integrity of the clay cover, and surrounding vegetation and soils. The seeding rates presented in the Table in Item "C" are based on pure live seed; therefore, the actual amount of seed applied is based on the percent purity and germination of the seed purchased. The specific varieties of the species will be based on availability at the time of seed purchase. Seeding of the mixture will be conducted after April 15w and before May 15~', if planted in the spring, and after the first hard freeze, approximately October 15"', if planted in the fall. A suitable grass drill will be used to plant the seed. The drill will have 7 to 12 inch spacing and be capable of planting fluffy seeds. It will be equipped with a seedbox agitator, picker wheels, separate small seed box, double disc furrow openers with depth bands on every disc, and packer wheels. The seed will be planted directly into cover crop residue if a cover crop has been used. In areas, which are inaccessible with a drill seeder, the seed will be broadcast at twice the drilled rate, followed by covering with a harrow or by handraking. Seeding, raking and harrowing operations will be conducted across the slope. Topsoil stockpiles will be seeded with the mixture shown in the Table in Item "C" if left in place for more than two seasons. If stockpiles will remain for more than two months or less than nine months, they will be seeded with a cereal grain such as oats or wheat at 20 pounds per acre (pure live seed).