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5.Marina Demolition and Decommissioning Methods <br />5.1 Landside <br />The landside restrooms and other structures are anticipated to be demolished using standard <br />methods with minor controls to ensure debris and runoff do not spill into the marina. The overwater <br />restrooms and access piers may also be easily accessible from the land side with more careful <br />consideration of debris and runoff collection. <br />5.2 Marina Side <br />The marina demolition would most likely be in reverse order of the construction process with the <br />following tasks: <br />Floats <br />The concrete and timber floats are disconnected from the guide piles and broken into smaller <br />sections. Using a barge-mounted crane, the timber floats can be loaded for offsite recycling or <br />disposal, and the concrete floats can be salvaged. <br />Building Structures <br />The Harbor Master’s office would require careful demolition to prevent debris from falling into the <br />water. The Blue Dolphin and former observation deck would require careful planning for safety. For <br />these structures, a landside crane and/or barge-mounted crane may assist in removing pieces for <br />offsite recycling or disposal. <br />Piles <br />After the floats, access piers, and buildings have been removed, barge-mounted vibratory <br />extractors can be used to remove the piles. The concrete and steel piles are expected to be <br />straightforward to remove, and may be salvaged. However, there is a risk that the timber piles may <br />break during the extraction process, especially at the piles that were repaired with an FRP jacket or <br />concrete top. These retrofits are designed to improve the bending and bearing capacity of the piles, <br />not tensile capacity. Therefore, it may be necessary to cut the timber piles to below the retrofit to <br />allow the extractor to grip onto the original timber section. Where the piles cannot be removed <br />without breakage, divers may be needed to cut the piles at the mudline. <br />Rip-Rap <br />Finally, after all the structures are removed from the marina, the rip-rap on the harbor basin slopes <br />under the access piers and building structures would need to be repaired. This may be <br />accomplished from the landside using long reach excavators. <br />33