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All irrigation ditches will be crossed via the open-cut method. If at all possible, irrigation ditch crossings would be scheduled for times when the ditches are dry. Otherwise, water flow would be maintained at all times unless arrangements are made with the affected parties to curtail flows. The project has been authorized under a U.S. Army Corps of Engineers Nationwide General Permit Number 12 (Project No. 199875445). This permit and conditions related to stream, channel, and wetland crossings aze included as Attachment 5. • Road Crossings: In order to avoid disrupting normal traffic patterns, pipeline crossings of county roads and other paved roads would be completed by boring. The boring method requires an additional TUA on either side of the bore for work space and soil storage. The lazgest bore pits would be excavated at six county road crossings (two on Rio Blanco County Road 5, two on Rio Blanco County Road 3, and two on Gazfield County Road 215), and these would have maximum dimensions of 8 feet deep, 20 feet wide, and 50 feet long. Pits would be sloped back to OSHA requirements for sa#ety and to allow equipment to enter and exit the pit. The pipeline would be installed at these locations using either a wet bore ("slick bore") or a dry bore, as described below. Minimum burial depth for road crossings is 48 inches. A wet bore involves drilling a small borehole and pulling the drill string and attached pipe back through the crossing behind a cutting head. Pressurized water would be used to remove drill cuttings. All water and cuttings would be contained in the bore pit or an adjacent area protected from siltation by erosion control methods. A dry bore involves using a jacking machine to drive the pipe through the soil that underlies the crossing. An auger is inserted through and somewhat beyond the pipe to remove or pull back the cuttings. To protect the pipe from the increased loading and abrasion caused by a dry bore, the pipe would be coated with "Powercrete," a durable outer coating, or would be installed in a lazger-diameter casing pipe. Depending on the durability of the jacket on the insulated pipe, American Soda may use a casing pipe at these crossings. Crossings of unsurfaced, lightly traveled roads would be completed by the open-cut method or other methods required by the landowner. These crossings would generally be completed in 1 day. Provisions will be made to detour or control passage of traffic while construction takes place. Pipeline Plan of Devdopma~t ~ Yankee Gukh Sodium Minerak PmjeR Amerimn'' a, LLP.