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s z s 3) EXISTING ROADS AS AFFECTED AREA The existing roads to be utilized as access routes for the permit mining activity are not to be substantially upgraded for this use. Surface use agreements negotiated with the land surface owner, BLM, and provided with *Exhibit S include only provision for normal maintenance grading and for replacing road base material to rep serve the existing condition of the road base and surface during permitted operations. The access route, including County Road 21, is not to be included in the bonded "affected area" of this permit. 4) MINING UNITS The enclosed *Exhibit C "Mining Map" has been herewith modified to clarify the extent of all 16 indicated mining Untts 1 through XVI. The north- south width dimension of all Units (except Unit XVI, at 190') is designated as 150 feet. East-west length dimensions however vary from 500 to 1950 feet depending upon the extent of the deposited gravel resource. 5) DRAINAGE CHANNEL RECONSTRUCTION The intermittent drainage channel that traverses mining Units IX through XIII shall be reconstructed at its approximate pre-mining location and outlet, featuring a 10-foot wide flat bottom ditch having 3-horizontal to 1-vertical re-vegetated sideslopes. Re-vegetation of the stream bottom is demonstrated by the existing situation to be impractical, and shall not be required nor attempted in the reclamation phase of the operations. The drainage channel slope run-down and 25 feet of the downstream channel at the west excavation boundary, however shall be rip-rapped to protect that portion of the channel from headwall erosion by the erosive forces of the higher velocity stream flow incurred by the steeper stream gradient. Rip rap material shall be provided from the larger screened cobble from pit operations. The outflow from the replacement channel into the off-site natural channel shall be controlled by silt fence and straw bale filtration dike, to control particulate bed-load of the stream, as per the site's qualifying Stormwater Management Plan, until upslope distwbed areas have been successfully re-vegetated. Certification under the state-wide general Stormwater Permit shall be acquired, as required, before mining Unir IX. 6) DRAINAGE CONTROL BERMS Natural drainage for the majority of the entire site is practically non-existent due to the sparse precipitation, the absence of a significant upslope watershed, and the porous absorbing nature of the surface soils. Natural slopes are generally west to east, beginning with the first eight mining units sloping to the east- southeast, and the remainder of the units sloping to the east-northeast.