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

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Draft Supplemental Environmental Impact StatementKeystone XL ProjectA list of typical equipment to be used during construction is presented in Table 2.1-14. Actualequipment used would depend on the construction activity and specific equipment owned orleased by the construction contractors selected.Table 2.1-14ActivityClearing and gradingTrenchingStringing, bending, and weldingLowering-in and backfillingMinimum Equipment Required for Selected Construction ActivitiesTie-ins to the mainline (six tie-in crews perspread; equipment listed if for each crew)Cleanup and restorationEquipment deployed for each spreadMinimum Equipment6 D8 dozers1 - 330 trackhoe (thumb and hoe pack)6 - 345 trackhoes2 D8 with ripper attachment1 - 140 motor grader6 - 345 trackhoes1 - 345 trackhoe with hammer4 ditching machines2 - 345 trackhoes vacuum fitted (1 at pipe yard, 1 at ROW)1 - D7 tow cat15 string trucks2 bending machines10 - 572 side booms10 - 583 side booms6 - automatic welding machines with end-facing machine8 ultrasonic testing units1 NDE unit2 heat rings4 coating rings3 sleds with generators3 - 345 trackhoes (1 equipped with long neck)5 - 583 side booms2 padding machines3 D8 dozers4 welding rigs7 - 572 side booms2 ultrasonic testing units2 heat rings2 coating rings1 sled with generators2 - 345 trackhoes (1 equipped with shaker bucket)2 - 583 side booms1 D8 dozer6 D8 dozers3 - 345 backhoes2 tractors with mulcher spreaders (seed and reclamation)100 pickup trucks2 water trucks2 fuel trucks7 equipment low-boys7 flatbed trucks5 - 2-ton boom trucksProject Description 2.1-44 March 2013
Draft Supplemental Environmental Impact StatementKeystone XL ProjectSurveying and StakingBefore construction begins, the construction ROW boundaries and any additional TWAs wouldbe marked to identify the limits of the approved work area. The locations of approved accessroads and existing utility lines would be flagged. Wetland boundaries and other environmentallysensitive areas would be marked or fenced for protection. A survey crew would stake thecenterline of the trench and any buried utilities along the ROW.Some landowner fences would be crossed or paralleled by the construction ROW, requiringfence cutting and modifications (see Section 2.1.8.7, Fences and Grazing, for actions to restorethe fences after construction is complete). Each fence would be braced and secured beforecutting to prevent the fence from weakening or slacking. Openings created in the fences wouldbe temporarily closed when construction crews leave the area to contain livestock. In addition,gaps through natural livestock barriers would be fenced according to landowners or landmanagers requirements. If livestock are present, temporary gates and fences would be installed.Clearing, Grading, and TrenchingPrior to or immediately after vegetation removal along slopes leading to wetlands and riparianareas, temporary erosion control measures such as silt fences or straw bales would be installed Afencing crew would install these erosion control silt fences and straw bales. The work area wouldbe cleared of vegetation, including crops and obstacles such as trees, logs, brush, or rocks.Grading would be performed where necessary to provide a reasonably level work surface orwhere required by landowners or land managers. Where the ground is relatively flat and does notrequire grading, rootstock would be left in the ground. More extensive grading would be requiredin steep slope areas to safely construct the pipeline. Where grading occurs and topsoil is present,topsoil would be removed from the entire area to be graded and stored separately from thesubsoil.A clearing crew would follow the fencing crew and would clear the work area of vegetation(including crops) and obstacles (e.g., trees, logs, brush, rocks). Standard agricultural implementswould be used on agricultural lands and standard machinery used in timber clearing would beused in forested lands. The amount of top soil stripping would be determined in consultation withthe landowner (based on agricultural use) and the Natural Resources Conservation Service. FullROW stripping for forested lands would be avoided where practicable. In areas of rocky soils orbedrock, tractor-mounted mechanical rippers or rock trenchers would fracture the rock prior toexcavation.In areas where topsoil segregation would be required, topsoil would be removed up to amaximum depth of 12 inches and segregated. In most areas where soil would be removed fromonly the trench, topsoil would be piled on the near side of the trench and subsoil on the far sideof the trench. A “triple lift” method would be used in certain areas of saline/sodic soils withlimited reclamation potential to minimize impacts to agricultural production. This method wouldinvolve stockpiling three different soil horizons, including the topsoil horizon. This separation oftopsoil from subsoil would allow for proper restoration of the soil during the backfilling process.Where soil is removed from both the trench and the spoil side, topsoil would be stored on thenear side of the construction ROW edge, and the subsoil on the spoil side of the trench. Inaddition, the spoil piles would be spaced to accommodate storm water runoff. Typical soilseparation methods are illustrated in Appendix G, CMRP.Project Description 2.1-45 March 2013
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2.1 Overview of the Proposed Project - Keystone XL pipeline - US ...

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