Safe Work Plan Emergency Drought Barrier Project
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Facilities RemovalAll rock, gravel, and structures will be removed from the project site in fall, with the exception of the sheet pile abutments. The methodology described herein is general. Although removal activities will primarily be situated in water, the contractors also will work from the levees. First, the contractors will mobilize construction equipment and crew. DWR will use multiple barges with excavators and work boats, which will be transported on water to the barrier site. In water, work will occur on one side of the barrier–either upstream or downstream from the barrier–in the direction of where the contractors will ship the rock. Next, the contractors will strategically place the barges adjacent to the barrier to excavate the rock. Rock will be excavated using cranes with clam-shell buckets, and/or excavators from one barge and placed onto another barge, where it will be transported to an approved off-loading site. Given the volume of rock, DWR anticipates that excavation will occur continuously (i.e., 24 hours per day, 7 days per week). To prevent levee scour, rock removal will start from the center of the channel and work outward. Excavation will occur from the top of the barrier down to the streambed to approximate pre-project contours. DWR will restore the levee geometry to ensure compliance with any local maintaining agency, Central Valley Flood Protection Board, or USACE requirements. Lastly, the rock will be shipped on a barge from the project site to be off-loaded onto dump trucks using excavators and loaders. The contractors will haul the rock to the Rio Vista stockpile location (outside waters of the U.S.), which is shown in Figure 2-4. DWR will monitor downstream water quality for parameters, including turbidity, identified in the Emergency Drought Barriers Water Quality Monitoring Plan, during the excavation process. Bathymetric surveys will be completed after emergency drought barrier removal to confirm that the rock is removed. 
Source: DWR, adapted by AECOM 2014 Figure 2-4. Stockpile Location
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