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2.4 Access Roads • The access roads adjacent to the evaporation azea, holding pond, and evaporative sprayers will allow one-way access for maintenance. The roads have an overall slope of approximately 1.5 percent with a top width of 10 feet. The roads aze approximately 2 feet high with side slopes of 3H:1V. 2.5 Diversion Channel The diversion channel was designed to intercept the 100-yeaz, 24-hour storm runoff from the drainage basins north of the evaporation azea and route the water azound the evaporation facility to dischazge downstream of the holding pond. The design incorporated three different slopes along its length: 1.7 percent from Station 0+00 to Station 1+74; 0.8 percent from Station 1+74 to Station 10+00; and 0.7 percent from Station 10+00 to Station 14+06, the tie-in to existing ground. During excavation, fractured bedrock was encountered between Stations 3+00 and 6+00. To facilitate construction, the design of the channel was changed from three slope segments to two, with the transition point at approximately Station 5+50. • The as-built average slope of the channel bottom is approximately 1.1 percent from Station 0+00 to Station 5+50, and approximately 0.8 percent from Station 5+50 to Station 12+00, the tie-in point to existing ground. Channel centerline elevations aze presented in Table 1. • Table 1 As-built Channel Subgrade Elevations Upper Channel Lower Channel Station Centerline Elevation ([t) Station Centerline Elevation (ft) 0+00 8617.6 6+00 8610.4 0+50 8617.0 6+50 8610.2 I+00 8616.5 7+00 8609.7 1+50 8615.9 7+50 8609.4 2+00 8615.3 8+00 8609.2 2+50 8614.9 8+50 8608.6 3+00 8614.4 9+00 8608.3 3+50 8613.7 9+50 8607.9 4+00 8613.1 10+00 8607.5 4+50 8612.6 10+50 8607.1 5+00 8611.9 11+00 8606.7 5+50 8611.6 11+50 8606.3 12+00 8605.9 Battle Mountain Resources, lnc. 3 August 10, 1999