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additional utility information was gathered through record drawings and potholing for <br /> critical facilities. Trenchless crossing methods (horizontal auger,conventional trench boring <br /> machine or microtunneling) will be used where required for major highways to minimize <br /> traffic control issues and greatly reduce public inconvenience. Roads with volumes less than <br /> 10,000 average daily traffic may be considered for full closure if allowed by the local <br /> agencies and if appropriate detours and traffic control plans are developed. <br /> Proposed Future Development <br /> Several alternatives were evaluated for the proposed alignment through the Brighton <br /> corporate boundaries,and the final alignment was selected with input from the City's <br /> engineering staff to avoid conflicts with existing City infrastructure and future <br /> development. The selected alignment will parallel the city's future sewer and drainage <br /> facilities through the Palomobo property,thus establishing a utility corridor in an area that <br /> will likely develop as commercial property.The route across the Elkhart LLC property <br /> south of Sable Road will follow the E-470 ROW around the northern perimeter of the <br /> proposed Adams County office complex. <br /> Special Crossings and Land Use Assessment <br /> Several locations have been identified as special crossings that require a trenchless method <br /> to be utilized. Special crossings include certain road crossings,railroad crossings,canals and <br /> waters of the United States that may result in federal action if they were not crossed using a <br /> trenchless method. It may be necessary to modify the construction technique depending on <br /> final determination of the existence and extent of jurisdictional wetlands or waters of the <br /> U.S. as determined by the USACE. <br /> Pipeline Segment 2 Alignment <br /> Several alternative locations for the Pipeline Segment 2 crossing of the E-470 corridor,and <br /> alternative pipeline corridors were evaluated.The 26th Avenue site was selected as the <br /> crossing location for Pipeline Segment 2 due to adequate ROW widths and minimal conflicts <br /> with existing and planned facilities. Initially,the pipeline route was recommended to run <br /> east along 26th Avenue,almost to Monaghan Road,then south across I-70 to the east side of <br /> the PS-3 site. This route had a high point along 26th Avenue west of Monaghan Road that is <br /> now avoided by relocating the pipeline to go south across 1-70 at the half-section line west of <br /> Powhaton Road.This change allows the pipeline to enter the PS-3 site on the west side. <br /> Refer to Figure 7 below for an overview of the Segment 2 alignment. <br /> Required Easements and Rights-of-way <br /> The majority of the Segment 2 alignment is within the west side MUE of E-470,which will <br /> minimize the number of easement acquisitions and streamline the permitting through one <br /> agency.All construction operations will be contained with in the 75-foot MUE.Typically, <br /> the minimum easement width for the SPP pipeline is 80 feet(60-foot permanent easement <br /> with a 20-foot temporary construction easement),but 75 feet is acceptable because the 5-foot <br /> depth of cover within the E-470 MUE provides shallower excavation depths. However,80 • <br /> - <br /> foot minimum easements are still recommended where additional easements are required <br /> outside the E-470 MUE,for constructability and to accommodate existing and future <br /> utilities. <br /> 17 <br />