San Leandro Marina Alts Study_Final

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2. Alternatives Considered habitat for wildlife and serve as a visual amenity. The wetland features would be designed with elevations set to be self-sustaining over time, but with an anticipated sea -level rise of 10 to 17 inches by 2050,2 the character of the features could be expected to modify itself with islands set at virtually high tide level today, and becoming high marsh areas over the next 30 to 40 years. All alternatives would also include a perimeter multi -use promenade around the basin, generally along the existing Marina pathway. The promenade would be lighted for security purposes and to encourage nighttime use. The theme for this promenade changes slightly between alternatives as described below. All alternatives would retain the existing overlook near Horatio's restaurant and the J/K restrooms currently located near the southeast corner of the basin. All new facilities (restrooms, other buildings, overlooks, promenades, boardwalks, and launch facilities) would be ADA -compliant. In the interests of clarity, the hydrogeological discussion is abbreviated below. Section 4.3 provides additional information on dredging, sedimentation, and hydrology for each of the Alternatives. Design concepts for each of the alternatives are illustrated following the discussion of each alternative. Marina Park Alternative This alternative would maintain an approximate 185 -slip Marina in the eastern portion of the Harbor Basin, eliminating the slips in the western portion of the basin (see Figure 2-2). The existing fuel dock would be removed and decommissioned. Remaining wooden slips would be upgraded as necessary and would range in size from 28 to 60 feet with an emphasis on larger slips reflecting recent market trends. Approximately 11 slips would be covered, as currently configured, and a maximum of 18 slips would be allowed for live -aboard boats. A replacement restroom to accommodate the berths would be constructed on the south end of the harbor, although its exact location will be determined at a later time and in consultation with the landside developer. The perimeter trail would be designed as a pedestrian promenade. A small, publicly accessible beach area would be developed in the northwest corner of the Harbor Basin and would also serve as an amenity for the hotel/conference center. The beach would be backdropped by a stepped shoreline suitable for seating. A stage area could be located in the center of the beach for outdoor concerts/events. Associated with the beach would be a small non -motorized boat rental concession, provided by the landside developer. There would also be boat and bike rentals at the boat launch. The western portion of the Harbor Basin would be dominated by natural features, including a marsh, a wildlife island/refugium, and various vegetative features. The western rip -rap shoreline of the basin would be backfilled to create a natural shoreline appearance and a vegetation transition from upland to wetland habitats. Some of the existing Marina concrete pilings would be retained for visual 2 http://www.hayward-ca.gov/departments/ced/documents/planning/2010/HASPA%2OReport%2Ovl5A%20- %20with%20acknowledgements.pdf San Leandro Marina Harbor Basin 2-3 ESA / 210461 Alternatives Study March 2011