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' pipeline and during cleanup and subsequent revegetation/soil stabilization. Proposed erosion control methods may include: • Channel Stabilization: In smaller intermittent channels, gabion (wire baskets filled with large cobbles and rocks) would be placed downstream of the channel to slow scour action and trap sediment. In larger channels, a downstream gabion structure would be installed, the eroded area backfilled, and ' another gabion structure placed upstream of the backfilled area to slow scour action and trap sediment. ' Diversion Structures: At some locations, waterbars (earthen dams) would be placed above the washout area to trap sediment and divert water away from the incised channel. Areas of exposed pipe would be backfilled and compacted. ' Gabion structures would be designed to withstand expected hydraulic loading and to avoid increased scour of the opposite bank. ' 4.0 Water Diversions: Water diversion structures will be constructed as needed to control surface w Ater runoff and erosion. To accomplish this, waterbars will be constructed on the contour across disturbed areas. Waterbars ' will be constructed to the size, spacing, and cross sections specified by the BLM to divert water from all disturbed areas for at least 3 to 5 years. Waterbars will be constructed to simulate the imaginary contour lines of the slope, to drain away ' from disturbed areas, and to continue across the ROW so that water is carried to established vegetation whenever possible. All such structures will be constructed according to BLM specifications. General spacing intervals shown ' for waterbars are provided in Attachment 2 -Pipeline Reclamation Plan. ' • Mulching: Site specific applications of mulch will be made to control erosion. Mulch will be applied on highly erodible soils and in areas with slopes greater than 15 percent. Only mulch that has been certified to be weed free will be used. Where applied, the mulch will be spread across the ROW, temporary use area, and laydown areas as needed. On steep slopes, hydromulching may be appropriate. i 3.4.2 Revegetation ' All disturbed areas will be seeded according to BLM seed mixture specifications, where provided. Seeding will be done at the end of construction or at the next prescribed seeding season. Seed labels from each bag shall be available for ' inspection while seeding is in progress. Certified, weed-free seed will be used whenever possible, and, in all cases, seed will be free of primary noxious weeds. A rangeland drill or similar device that contains disks and separate seed boxes ' will be used to apply seed. ' PipeWe Wormaoon Summary 20 YankR GWch Sodium Minerals Pro~ert ' Amencan Soda, L.L.P.