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<br /> <br /> <br />r <br />~i <br /> <br /> <br /> <br /> <br />~~ <br />L~ <br /> <br />LJ <br /> <br /> <br />1 <br /> <br /> <br />1 <br /> <br /> <br />Luis Project specifically. Dr. Cook's main concern over providing <br />enough subsoil is related to coarse rock fills or toes of slopes <br />where the coarser rock tends be segregated. In the case of the <br />San Luis Project "suitable subsoil" referred to in the reference <br />quoted can be provided to a depth of 18 inches by the waste rock <br />material itself. Waste rock in general is made up of a variety <br />of rock sizes. The actual size components can vary within a pile <br />due to changing rock types and sizing is not fully known until <br />the waste rock piles are constructed. In addition, during <br />construction a segregation of coarser material to the bottom of <br />the lift occurs during dumping leaving the finer material on top. <br />The action of haul trucks and dozers on the piles also tends to <br />break down any coarser materials which may remain on top. The <br />uppermost lift of a normal waste rock pile is believed to be <br />suitable growth medium. At the San Luis Project, this can be <br />demonstrated by examining the old heap area where run-of-mine <br />material without topsoil is exhibiting enough fine material to <br />support natural invasion. <br />In addition, Dr. Cook cautioned against the use of the <br />predominantly sandy subsoils such as the subsoils typically found <br />at the San Luis Project below the B horizon as a suitable subsoil <br />material. These sails will likely provide less water holding <br />capacity and will not enhance the revegetation efforts. <br />BMR does not believe that it will be necessary, and in fact it <br />may be detrimental, at the San Luis Project to salvage 2 to 3 <br />feet of subsoil to aid in the revegetation effort. <br />Further research by MLRD revegetation expert led MLRD to request that 18 <br />inches of topsoil/plant growth medium be replaced. BMO agreed to comply with <br />this request and revised Exhibit E, Section E.2.1 2/15/89. <br />Section E.2.] Grading and Stabi)ization <br />65. Roads should be graded upon reclamation so that they bend in with the <br />adjacent topography, and not act as drainages. Please address. <br />Response: Road reclamation, including grading to blend with the adjacent <br />topography, is discussed in Section E.3.5. <br />No application change necessary. <br />Section E.2.4 Surface and Seedbed Preparation <br />66. Please specify the application rate of hay if it is chosen as a <br />mulching material. <br />Response: If hay is used as the mulching material the application rate will <br />be two tons per acre. <br />Exhibit E, Section E. 2.4 revised 4/20/89. <br />Section 1.2.5 Seeding Mixtures and Rates <br />