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20.3 EXECUTION The CONTRACTOR shall give the PROJECT MANAGER at least two (2) days notice of the time and place of starting his revegetation operations and shall continue to advise as to the schedule of operations. I~evegetation may take place at the completion of work at an individual opening if the CONTRACTOR so desires. Fertilizers Immediately prior to seedbed preparation, fertilizer shall be uniformly applied over the areas designated for needing and immediately incorporated into the soil by tilling methods as discussed below. Commercial fertilizer shall be applied at the rate of 300 pounds per acre. Manure shall be applied at the rate of 30 tons per acre. Seedbed Preparation The seedbed shall be firm. Trash, weeds and other debris that will interfere wish seeding operations shall be removed or disposed of as approved by the PROJECT MANAGER. On sites where equipment can operate, the seedbed shall be adequately loosened (four to six inches (4" to 6") deep) and smoothed. Chiseling, discing, harrowing or cultipacking may be required. Work shall be done on the contour where practicable. On sites whene equipment cannot operate, the seedbed shall be hand-raked or otherwise prepared by hand by scarifying to a minimum depth of one inch (1") to provide a roughened surface so that seed will stay in place. Seedbed preparation shall be suspended when soil moisture conditions are not suitable for the preparation of a satisfactory seedbed as determined by the PROJECT MANAGER. Seeding The designated seed mixture shall be sown uniformly on the prepared areas. Seeding shall not be done if the ground is frozen. Some areas, such as rock outcrops, etc., within the work limits may not be designated to be seeded. Drill Seeding. In all areas where practicable and where the area to be seeded exceeds one (1) acre, seeding :;hall be performed with a grassland drill with depth bands and seedbox agitator and equipped with either packing wheels or a cultipacker. The drill shall be capable of properly handling the seed on all slopes designated for this method. Seed shall be drilled across the slope, where practicable. The distance between drilled furrows shall not be more than twelve (12) inches. Seed shall be planted one-quarter inch (1/4") to one-half inch (1/2") deep. Broadcast Seeding. Seeding shall be performed using hand-operated or machine seeders whereby dry seed shall be applied in prescribed quantities uniformly on specified areas. Broadcast seeding shall be used where drill seeding is not practicable, or where the area to be seeded is less than one acre, or may be used at the Contractor's option. Broadcast seed shall be covered about one-quarter (1/4) to one-half (1/2) inch deep by flexible-tine harrowing or a similar method acceptable to the PROJECT MANAGER. One to two operations may be required to obtain adequate coverage as specified by the PROJECT MANAGER. Colorado Division of Minerals & Geology GENERAL BID SPECIFICATIONS 1996 Page 2