Vantage to Pomona FEIS Index 34 - Laserfiche WebLink

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Vantage to Pomona Heights Chapter 2 230 kV Transmission Line Project FEIS Proposed Action and Alternatives PAGE 2-28 For all helicopter activities, the construction contractor would work with the appropriate federal, state, and local agencies to ensure that the appropriate notifications are made to coordinate the air space with other possible aircraft and helicopters in the area being used for military training, fire support, or other use. 2.2.3.8 Construction Yards/Staging Areas and Fly Yards Several construction yards/staging areas, roughly five acres each, would be required for materials and equipment storage and staging and helicopter operations (fly yard) for construction activities. Possible locations would be identified during preliminary engineering design. All possible areas would be located on existing disturbed areas, and locations would be approved by land owner or land management agencies. The yards would serve as field offices, reporting locations for workers, parking space for vehicles and equipment, and sites for temporary marshalling of construction materials. 2.2.3.9 Marking of Sensitive Areas All sensitive areas, biological and cultural, would be marked on drawings and in the field prior to construction to ensure protection and avoidance of these areas according to resource protection plans in the POD. Marking in the field would consist of wooden stakes, which would be spray painted the same color (e.g., high visibility blue) for all sensitive areas. The stakes would represent general avoidance areas; no distinction between biological and cultural sites would be made. The marking would take place prior to construction. A preconstruction walk with the construction contractor and appropriate agency and/or tribal entities would be conducted to identify avoidance areas in the field. After construction is complete in an area or when it has been determined there is no longer a threat to important biological and cultural resources, the stakes would promptly be removed to protect the sites location and significance from gaining unwanted attention and/or damage. 2.2.3.10 Erosion and Sediment Control Erosion and sediment control may be necessary to prevent soil erosion in construction areas located on hillsides where a road to access a structure location or a leveled area is required to allow equipment set-up for pole installation. Applying and maintaining standard erosion and sediment control methods would minimize erosion. These may include weed-free straw wattles, weed-free straw bale barriers, and silt fencing which would be placed at construction boundaries. Gravel ramps may be installed at access points to public roadways, as needed, to prevent or minimize the tracking of mud, dirt, sediment, or similar materials onto paved roadways. An Erosion and Sediment Control Plan will be included in the POD. Erosion control structures such as waterbars, diversion channels, terraces, and slope roughening may be constructed if determined to be necessary to divert water and reduce soil erosion along the ROW corridor or other areas disturbed by construction where slopes exceed 30 percent. Selection of appropriate erosion control materials would be based on soil properties, steepness of slope and anticipated surface flow or runoff, and would be detailed in the proposed Project’s Stormwater Pollution Prevention Plan (SWPPP). Existing vegetation would be preserved to the maximum extent practicable during all phases of construction. Vegetation clearing would be kept to a minimum and occur only where construction plans call for it. All disturbed areas would be re-seeded using a seed mixture as specified by the appropriate land management agency and best management practices for erosion control. Re-seeding would occur during the appropriate season(s) for successful establishment of new vegetation. On slopes greater than 30 percent, additional measures such as organic fiber mulching, geo-textile fabrics, and sod mats may be used. Specific erosion and sediment control measures and locations would be specified in a SWPPP.