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1.5-inch to 0.75-inch gravel over the existing roadway section, and <br />approximately 20 inches of compacted 1.8-inch to 0.75-inch gravel in <br />the new road section. The road base is 28 feet wide. The road sur- <br />face is rubberized asphalt mixed with 0.75-inch aggregate to a width <br />of 24 feet. The road surface is crowned with a slope of 0.25 inch per <br />foot toward each side of the road. <br />Ditches are located along <br />the surrounding area and <br />Culverts are provided at <br />otherwise at a maximum of <br />and culverts are designed <br />24-hour flood event. <br />the road to intercept surface runoff from <br />to divert runoff from the road surface. <br />any natural watercourse intersection and <br />every 1,000 feet of road length. Ditches <br />:o safely pass the peak flow from a 10-year, <br />Maintenance includes repairs to the road surface, embankments, and <br />drainage facilities to meet initial design criteria. The road surface <br />is maintained by filling potholes and resurfacing with asphalt <br />overlays as required. Other maintenance includes revegetation of cuts <br />i and embankments and cleaning of ditches and culverts. <br />The existing multi-purpose county road was improved by paving the <br />length of the road from the mine to the Crystal River Ranch. The <br />paving meets county and state specifications far 90,000-pound truck <br />traffic. The 90,000-pound limit allows the trucks to carry a full <br />laod of 30 tons of coal, thereby cutting truck traffic 20 percent <br />below the number otherwise required under the previous 80,000-pound <br />load limit. <br />An existing ranch road was also improved to appropriate standards as <br />mentioned above. This road follows existing contours until a point <br />opposite the truck dump. At that point, the road turns and goes <br />directly to the dump site. This route was selected to minimize <br />disruption to agricultural use of the remainder of the ranch. The <br />u <br />4-36 <br />