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

Draft Supplemental Environmental Impact StatementKeystone XL ProjectBaseRouteLength(Miles)RerouteLength(Miles)MaximumPerpendicularDistance fromCenter Line(Feet) Reason for Route Change aCountyBeginMPEndMPHolt 661.82 663.75 1.77 1.94 1,796 The primary reason for this proposed rerouteis to avoid landowner’s row of trees locatedin tract ML-NE-HT-30405.000 by shiftingthe CL and TWAs east.Holt 665.44 667.47 1.85 2.03 1,845 Landowner preferenceBoone 740.05 741.02 0.93 0.98 457 Landowner preferenceBoone 745.45 746.88 1.47 1.44 1,344 Landowner preferenceBoone 749.98 750.94 0.96 0.96 201 The primary reason for this proposed rerouteis to avoid a large drain that is located next toa road and to allow the drainage feature androad be crossed separately by shifting thecenterline and work spaces further west.Nance,Merrick,York,Polk764.99 796.31 31.49 31.33 50,938 See Table 2.3-2 of Nebraska SER (expEnergy Services, Inc. 2012a).Saline,Jefferson840.95 855.03 13.49 14.08 18,546 See Table 2.3-3 of Nebraska SER (expEnergy Services, Inc. 2012a).Jefferson 873.29 874.50 1.29 1.20 275 The primary reason for this proposed rerouteis to shift CL and TWAs away from fencethat runs parallel to the current CL.Source: exp Energy Services, Inc. 2012a.aCL = Centerline; TWA = Temporary Workspace Area; HDD = Horizontal Directional Drill; MLV = mainline valve; PI = Pointof Inflection (angle).The route as proposed by Keystone is modified from the Final EIS route to avoid the NebraskaDepartment of Environmental Quality (NDEQ)-defined Sand Hills Region. The original pipelineroute in Nebraska as presented in the Final EIS trended northwest to southeast beginning at theSouth Dakota and Nebraska border in Keya Paha County, Nebraska, and ending at Steele City,Nebraska. The route as proposed by Keystone avoids the NDEQ-defined Sand Hills Region aswell as additional areas in Keya Paha County identified by the NDEQ that have soil andtopographic characteristics similar to the Sand Hills Region. The proposed route also avoids theVillage of Clarks wellhead protection areas in response to concerns expressed by NDEQ andother stakeholders. The proposed route places the pipeline approximately 4 miles downgradientand to the east of the wellhead protection area boundary as shown in Figure 2.1.1-1.Theproposed route also avoids the newly designated Village of Western wellhead protection area,which is depicted in Figure 2.1.1-2.The original Final EIS route for Nebraska included approximately 254 miles of pipeline andassociated project facilities. The total proposed route in Nebraska is now approximately 275miles long, of which approximately 209 miles comprise the route modification portion of theproposed route. Table 2.1-3 shows the changes between the original Final EIS route and theproposed route. Keystone’s proposed route also includes four pump stations, which are onlytentatively sited at this time. There is one pump station on the portion of the proposed route thathas not changed from the original route evaluated in the Final EIS.Project Description 2.1-5 March 2013