1989-10-10_REVISION - M1988112 (16)

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• 4.0 SITE PREPARATION 4.1 Clearing, Grubbing, and Striooinq Clearing, grubbing, and stripping shall be done for the embankment foundation areas, tailings disposal area, secondary collection facilities, access roads, and miscellaneous structures, as shown on the Drawings. Clearing involves removal of surface vegetation by a method that mulches the vegetation for inclusion in the topsoil stockpile. Grubbing involves removal of brush roots in excess of ~ inch in diameter in the subsoils. Stripping involves removal of organic soils, or otherwise unsuitable foundation materials, as determined by the Engineer. An organized topsoil stripping pattern with grade stakes shall be impledented by the Contractor as approved by the Engineer to ensure that topsoil is removed without over excavation. The Engineer shall examine the exposed soils to determine their suitability as liner base soils. • ` Clearing, grubbing, and stripping shall extend 20-ft beyond the embankment and synthetic liner limits. Clearing, grubbing, and stripping limits shall extend five-ft beyond diversion structures, access roads, and other facilities. The vegetative and topsoil materials removed during clearing, grubbing, and stripping shall be removed and disposed in topsoil stockpile areas as shown on the Drawings or directed oy the Owner. Topsoil stockpiles shall be located adjacent to the final disposal area limits. Side slopes of topsoil stockpiles shall oe no steeper than 2H:1V. Topsoil stockpiles shall be stabilized by seeding with a quick growing cover crop such as western wheatgrass. 4.2 Monitoring Wells Monitoring wells outside of the tailings impoundment area shall be protected and maintained in good operating Condit ion throughout • construction. The Contractor shall be solely responsible for the 14