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vegetative filter to address any anticipated sediment control requirements. Progressive backfilling, soil <br />replacement, and revegetation of the pipeline disturbance immediately following pipeline installation will serve to <br />minimize any short- or long-term impacts. .Where the pipeline crosses under Fish Creek, BMP's at the crossing <br />. location will include placement of stream buffer zone markers at any point where the pipeline corridor is within 50 <br />feet of the stream buffer zone prior to any activity; completion of the work during low-flows; placement of silt <br />fence or anchored straw bales at least 50 feet downstream to catch any sediment released prior to initiation of work; <br />placement of sediment control materials (straw wattles or silt fence) around the entire side and near stream <br />perimeters of the jacking pit disturbance areas; restrictions on storage or transfers of petroleum products within the <br />buffer zone; and reclamation of the affected areas immediately following completion of pipeline installation. <br />Construction and sediment control details are shown by the design drawings in Exhibit 490. <br />Thickener Underflow Pipelines and Borehole (TR07-60, MR07-2211- With the exceptions of the surface casing for <br />the Underflow Borehole and any intermediate access manhole(s), surface disturbance for the Thickener Underflow <br />Pipelines and Borehole will be temporary and surface activities will be limited to pipeline/borehole installation <br />activities. During construction, and for the minor surface structures, drainage and sediment control will be provided by <br />Alternative Sediment Controls (ABC's) consisting of combined Best Management Practice (BMP) measures. <br />Construction-related surface disturbance will be limited to soil removal and windrowing from the pipeline trench <br />alignment and borehole pad area, excavation of the trench and temporary stockpiling of excavated material adjacent to <br />the trench, and excavation of temporary pits (within existing disturbance areas) for pipeline boring or jacking operations <br />under the Foidel Creek culvert crossing and raikoad spur. Following installation of appropriate ASC's for each portion <br />of the project disturbance, available soil materials will be bladed from any new disturbance areas and temporarily <br />windrowed on the upgradient edge of the disturbance area. <br />Much of the pipeline excavation and borehole pad disturbance will occur in areas that are, or have previously been, <br />disturbed. For the remaining pipeline trench areas, consideration of soil horizon segregation must be balanced with the <br />objective of limiting overall surface disturbance. In the interest of minimizing overall surface disturbance, TCC <br />proposes to not segregate and separately stockpile individual soil horizons for the pipeline trench disturbance, and <br />• submits that this approach will not significantly alter soil suitability characteristics, since the differences between the <br />• <br />TR08-65 2.05-84.1 08/20/08 <br />