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1 <br />' The pipe will be manufactured with American Petroleum Institute (API) X65 or <br />X60 grade steel. The wall thickness of the pipe will likely be increased in areas of <br />road crossings to meet jurisdictional restraints and design criteria. Wall <br />thickness may be increased for added strength, workability, and safety at valves, <br />stream crossings, and road crossings. All pipes will have an external anti- <br />, corrosion coating of fusion-bonded epoxy (FBE) applied under controlled <br />conditions at the pipe mill. <br />The minimum burial depth for the mainline pipes will be 30 inches from the top <br />of pipe, which is in accordance with 49 CFR Part 195. Minimum burial depths <br />' will be increased to 48 inches at public road crossings and to 60 inches below the <br />bottom of the restored streambed at stream crossings. Figure 2-1 shows the <br />proposed layout of the two pipes, including spacing and padding. <br />' • Valves: It is estimated that three full-conduit gate valves will be placed <br />along the pipeline. Valve spacing generally will be approximately 15 miles, with <br />' variations to meet applicable design codes. The valves will be buried below <br />ground in 6-foot corrugated conduit pipes and will be accessib'.e through a locked <br />box at ground level. These valves will be manually operated. Tha number and <br />' size of valves could change following completion of final design. <br />2.3 Pipeline Specifications <br />Both pipes (product line and return line) will be placed in a single trench. The <br />pipeline trench will be 72 to 80 inches wide and 54 to 60 inches deep. The two <br />' pipes will be spaced 24 inches apart. There will generally be 6 inches of bedding <br />under the pipe and 30 to 36 inches of soil above the pipe, depending on the <br />presence of rock substrate. At perennial stream crossings, the minimum burial <br />depths will be increased to 60 inches below the bottom of the restored streambed. <br />At public road crossings, the product and water return pipelines will be placed in <br />separate bores 10 feet apart, with the pipelines buried 48 inches deep. <br />' • Pipeline Corridor Dimensions <br />The pipeline construction ROW (construction easement) will generally be a <br />maximum of 125 feet wide to allow for operation of construction machinery, <br />placement of excavated materials, and movement of other pipeline construction <br />traffic along the pipeline corridor during pipeline construction. The <br />construction ROW may be less than the proposed 125-foot width in some areas to <br />' mitigate potential impacts to existing resources, and it may also overlap existing <br />pipeline corridors in certain locations. The permanent pipeline easement width <br />will be 50 feet. <br />1 <br />' Pipelin lnfomuhon Summary 5 <br />Yanks GWch Sodium Minerals Projvt <br />Amv¢an Soda, L.L.P. <br />