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<br />II <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br /> <br />specifications to be developed in the project design phase. A concrete vault will be <br />constructed to encompass the tee and valves connected to the 24-inch steel pipe segment <br />and a portion of the proposed pipeline. <br /> <br />Section A-A', as presented in Figure 6.2, is typical of pipeline construction in the area from <br />Station 718+00to Station 754+00,and from Station 816+25to Station 822+21. Along with <br />the construction of the junction boxes, a trench will be excavated from the area of the <br />proposed boxes for pipeline placement. The trench excavation will be carried out such that <br />the top of the excavation shall not encroach toward the highway any closer than fifteen feet. <br />Due to shallow bedrock and the presence of large boulders in this section, the trenching <br />operation may be difficult and some blasting may be required. Special excavation support <br />may be required to prevent disturbance of the existing pipeline and S.H. 65 and 1-70. The <br />trench sidewalls will be constructed to applicable OSHA standards and the trench bottom <br />will be wide enough to facilitate pipe placement and bedding material. <br /> <br />Once the excavation is completed, the bottom will be inspected to determine the presence <br />of any soft, unstable areas or other areas which may present foundation support problems. <br />These problems will be corrected as required prior to pipe placement. The bedding material <br />will be placed in the trench bottom to a depth of at least one foot. The steel pipe will then <br />be placed on top of the bedding material, beginning in the area of the junction boxes. Cover <br />material will then be placed on the top of the pipe, covering the pipe to a depth of <br />approximately one foot above the pipe. The native materials which were removed from the <br />trench will be replaced and compacted in lifts. <br /> <br />Section B-B', as presented on Figure 6.3, is typical of pipeline construction in the area from <br />Station 754+60 to Station 762+ 10. This section presents a conceptual detail of pipeline <br />construction along the Plateau Creek flood plain. Subsurface conditions may present <br />problems during excavation of the pipeline trench, due to soft and unstable subsurface soils <br />and shallow water table. The construction may require de-watering and excavation support. <br />The material exposed at the bottom of the trench may be soft and lack the proper <br />compaction required to provide adequate support for the proposed pipe. Some <br />densification and stabilization may be required. The methods of stabilization may consist <br />of excavation and replacement or placement of gravels at the bottom of the excavation and <br />pushing them into soft subgrade soils to provide adequate support for pipeline. The bedding <br />material will be placed in the trench bottom to a depth of at least one foot. The steel pipe <br />will then be placed on top of the bedding material. Cover material will then be placed on <br />top of the pipe, covering the pipe to a depth of approximately one foot above the pipe. The <br />native materials which were removed from the trench, will be replaced and compacted in <br /> <br />37 <br />