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Appendix D 1 2 Appendix D 3 Anchoring Plan 4 Disposition of Offshore Cooling Water Conduits February 18, 2005 D-1 SONGS Unit 1 EIR Appendix D 1 2 3 4 5 6 7 This page intentionally left blank. 8 Disposition of Offshore Cooling Water Conduits February 18, 2005 D-2 SONGS Unit 1 EIR Southern California Edison Company SONGS 1 Intake and Discharge Conduit Dispositioning Project Work Execution Plan SECTION FIFTEEN - ANCHORING PLAN 15.1 Overview All nearshore and offshore activities will take place from a support vessel or derrick barge, or a surf sled vehicle (SSV). The support vessel or derrick barge will be moored in three or four-point anchorages. The SSV will be pulled ashore by a beach winch anchored by a deadman. The following anchoring protocols and plans will be employed in deploying, utilizing and recovering anchorages. 15.2 Anchoring Requirements The disposition work will generate the following anchoring requirements: 15.2.1 Support Vessel or Derrick Barge Anchoring A support vessel or derrick barge will be used to support the SSV operations and to support all offshore dispositioning operations. The support vessel or derrick barge will be moored over the planned work locations utilizing four anchorages (Anchor Set). Anchor Sets 1 through 3 will consist of 4-point anchorages while Anchor Set 4 will consist of a 3- point anchorage. 15.2.2 Beach Winch Anchoring The SSV will be pulled shoreward from its launching position by a beach winch anchored to the beach with a buried deadman. 15.3 Definition of an Anchor Set For purposes of this WEP, an “anchor set” is defined as any combination of anchors set at predetermined locations to provide anchorage within a defined work area. For example, a four- point anchor set involves the deployment of one anchor from each of the four corners of the derrick barge or support vessel. 15.3.1 Predefined Anchor Set Four anchor sets have been predefined for the nearshore and offshore dispositioning. These anchor sets have been plotted in attached Appendix C - Anchor Pre-Plot. The final locations and sizes of the anchor sets may be adjusted in the final Work Execution Plan as needed to suit the site conditions in existence when the dispositioning work is actually performed. Final Draft 120804 Page 92 Associated Pacific Constructors, Inc. Southern California Edison Company SONGS 1 Intake and Discharge Conduit Dispositioning Project Work Execution Plan 15.3.2 Safety Zone A safety zone is proposed around the anchor set. This safety zone will be defined as an imaginary boundary drawn between each anchor crown buoy of the anchor set. The purpose of this safety zone is to provide a boundary around the marine work site that helps commercial and recreational vessels in identifying the marine work site and remaining outside of the work areas. The safety zone will be physically discernable at the work sites by visually sighting between the crown buoys of the anchor set. The crown buoys will be marked with appropriate colors, striping and lettering, and will be also be marked with strobe lights. Figure 15-1 Typical Anchor Set Diagram Final Draft 120804 Page 93 Associated Pacific Constructors, Inc.
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