2.1 Overview of the Proposed Project - Keystone XL pipeline - US ...

Draft Supplemental Environmental Impact StatementKeystone XL ProjectStateCountyStructures Within 25 Feet ofConstruction ROW (Number)Structures Within 500 Feet ofConstruction ROW (Number)Boone 0 33Nance 0 15Merrick 0 8Polk 0 19York 0 20Fillmore 0 7Saline 0 14Jefferson 0 112.1.8.7 Fences and GrazingFences would be crossed or paralleled by the construction ROW. Before cutting any fence forpipeline construction, each fence would be braced and secured to prevent the slacking of thefence. To prevent the passage of livestock the opening in the fence would be closed temporarilywhen construction crews leave the area. All existing fencing and grazing structures, such asfences, gates, irrigation ditches, cattle guards, and reservoirs would be repaired topreconstruction conditions or better upon completion of construction activities. If gaps in naturalbarriers used for livestock control are created by pipeline construction, the gaps would be fencedaccording to the landowner’s requirements. All existing improvements, such as fences, gates,irrigation ditches, cattle guards, and reservoirs would be maintained during construction andrepaired to preconstruction conditions or better upon completion of construction activities.2.1.9 Waterbody CrossingsIn the final design phase of the proposed Project, perennial waterbody crossings would beassessed by qualified personnel with respect to the potential for channel aggradation ordegradation and lateral channel migration. The level of assessment for each crossing would varybased on the professional judgment of the qualified design personnel. The pipeline would beinstalled as necessary to address any hazards identified by the assessment. The pipeline would beinstalled at the design crossing depth for at least 15 feet beyond the design lateral migrationzone, as determined by qualified personnel. The design of the crossings also would include thespecification of appropriate stabilization and restoration measures.The actual crossing method employed at a perennial stream would depend on permit conditionsfrom U.S. Army Corps of Engineers (USACE) and other relevant regulatory agencies, as well asadditional conditions that may be imposed by landowners or land managers at the crossinglocation. Where the HDD method is not used for major waterbody crossings or for waterbodycrossings where important fisheries resources could be impacted, a site-specific plan addressingproposed additional construction and impact reduction procedures would be developed (seeCMRP, Appendix G). Prior to commencing any stream-crossing construction activities, at aminimum, permits would be required under Section 404 of the Clean Water Act throughUSACE, and Section 401 Water Quality Certification, per state regulations. These agenciescould require measures to limit unnecessary impacts such as requiring all the non-HDD crossingsto be constructed during dry conditions. Additional information on the types of crossing methodsproposed for use on the proposed Project is presented in the subsections below.Project Description 2.1-55 March 2013