Section 3.10: Site Plans and Technical Data - Rick Neufeld Comments

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Northern Gateway Pipelines Inc. Section 3.10: Site Plans and Technical Data Table of Contents 2.2.3.3 Fill for Levelling Courses Although efforts will be made to minimize the amount of rock overbreak, the surface of the rock face after blasting will likely be somewhat irregular, which is not ideal as a bearing area for structure foundations. In order to seat the marine structures properly, it may be necessary to place a layer of engineered fill or tremie concrete on the horizontal rock faces to act as a levelling course in order to provide a flat working surface. This surface will facilitate seating of the structures and the drilling of anchor piles or rock sockets. 2.3 Tanker Berth Marine Structures Several structure types and construction methodologies were considered during the development of the tanker berth marine structures. For each concept various criteria were evaluated such as design practicality, reliability, durability, constructability, and long-term maintenance issues (Reference 2). Based on a review of the advantages and disadvantages, and the associated risks for each concept, two options are proposed for each functional element of the tanker berths. The proposed options represent a range of structure-types and construction methodologies that are considered the most viable for this project. 2.3.1 Tanker Berth Structural Arrangement Each tanker berth is comprised of the following functional elements: • Central Loading / Unloading platform structure; • Breasting / berthing dolphin structures; • Mooring structures; and, • Access structures consisting of main and secondary trestles, and catwalks. The basic layout of the berths is based on conventional industry practice for tanker berths and complies with the recommendations of the Oil Companies International Marine Forum (OCIMF), which is one of the most widely recognized international standards. OCIMF guidelines for the layout of tanker berths are summarized in Figure 2-4. The berth layouts also generally comply with TERMPOL Appendix 3, Berth, Mooring and Fendering guidelines. The TERMPOL guidelines (Diagram B, Appendix 3) differ somewhat from the OCIMF guidelines in that they recommend providing a head line and stern line at approximately 45 degrees from the axis of the largest ships. Although these lines are less efficient than “pure” breasting lines or spring lines, they do offer some additional redundancy and safety during storm wind conditions. The proposed berth layout therefore includes additional mooring points on shore, located to provide head and stern lines lead angles of approximately 45 degrees (see Drawing No. 002). These additional mooring points could be used at the ship master’s discretion if desired. Page 2-8 FINAL - Rev. 0 January 20, 2010
Northern Gateway Pipelines Inc. Section 3.10: Site Plans and Technical Data Table of Contents Figure 2-4 OCIMF Guidelines for Tanker Berth Layout (Reference 19) Two different configurations of these functional elements are shown in Drawing Nos. 003, 003A, 004 and 004A. For both options, the central loading / unloading platform provides the interface for transferring cargo between the ship and the on-shore tank facilities. Located in the middle of each berth, the central platform will be an independent structure that supports the cargo transfer arms and will have a deck surface approximately 35 metres wide and 58 metres long. Piping, loading arms and other equipment will take up a portion of the deck space and the remaining area will be available for maintenance vehicle access such as a mobile crane or truck. January 20, 2010 FINAL - Rev. 0 Page 2-9
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Section 3.10: Site Plans and Technical Data - Rick Neufeld Comments

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