Laserfiche WebLink
ESA C. Project Scope <br /> • <br /> 4. Shoreline Configuration, Sedimentation <br /> Patterns, Hydrodynamics <br /> We understand that the City desires to evaluate alternative uses of the harbor <br /> y i , y; i basin, from maintaining the present use to thc maximum extent possible to <br /> i i L it I j If { ■converting portions to biological resource areas. Moffatt & Nichol will <br /> „z.',I • provide an opinion, using best engineering judgment, of the potential for <br /> utilizing the existing shoreline or reconfiguring it for other recreational uses, <br /> trU • • a <br /> it r- clai reconfiguring thc berthing layout and/or launching facility to leverage areas <br /> . `� <?+?,�:G= + of low deposition, and reducing thc marina navigation uses by re- allocating • <br /> some portions of the basin for creation of islands and/or marshes. <br /> The potential shoreline and basin reuse concepts, such as nesting/roosting <br /> islands, marshes, or a recreational beach, will be evaluated based on their <br /> ability to stabilize and thrive based on known current patterns, wave <br /> environment, and sediment characteristics. An opinion on potential <br /> maintenance associated with the shoreline concepts, taking into consideration <br /> the local sediment characteristics and wave climate, will be also provided. <br /> 5. The No- Action Alternative: Continuing to <br /> operate the Marina <br /> From conversations with Delmarie Snodgrass, the north side of Harbor, with <br /> its more recently constructed larger and deeper berths and concrete slips, <br /> appears to offer the best possibilities for re-use. However, with equilibrium <br /> depths in.the channel and basin estimated to range from I to 3 feet, future use <br /> of the basin as a conventional marina appears limited. <br /> There are other ways to view the Harbor, however. The Alameda County <br /> Fire Department maintains a rescue boat at the Marina; other Search and <br /> Rescue functions could base there, dispatching, for example, Coast Guard <br /> "Guardian" class vessels which draw 3 feet or less and which would be <br /> supported by shallower and Tess costly dredging, and perhaps higher user <br /> fees, than is now the case. Slightly more ambitious would be using those <br /> portions of the marina which have lower deposition rates for small power <br /> boats, kayaks, and perhaps dinghy sailing and instruction. <br /> This would leave the rest of the Basin to revert to mudflat, which would <br /> acquire salt water emergent vegetation over time, which in turn would <br /> promote sediment accretion and more vegetation until an equilibrium is <br /> reached. Such a process occurred during the decade when ESA biologists <br /> were monitoring Bunker Marsh and the end result was a complex assemblage <br /> of plants and associated wildlife. The No- Action Alternative could then be <br /> Gry of Son Leandro Harbor Basin Attomafives Study RFP 50536 C-3 <br />