San Leandro Marina Alts Study_Final

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5. Alternatives for Future Use of the DMMS would consist primarily of relatively intensive vegetation management (e.g., frequent discing, spraying of saline water onto the site) and mosquito control measures. 17 Compatibility with Harbor Basin Alternatives The Harbor Basin alternatives, as presented Section 2 of this report, are: • No Action • Marina Park • Aquatic Park • Nature Park In addition, a dredged materials disposal concept, discussed in Section 3, is also being considered. This concept is a phasing plan that starts with the Marina Park Alternative, using only cost-effective disposal areas, then allows transition to a long-term plan in the future. The long-term plan could be continuation of the Marina Park Alternative harbor configuration, if a cost-effective means of dredge material disposal becomes available. Or it could be a transition to the Aquatic Park or Nature Park Alternatives. Placement of fill at the DMMS site is considered cost-effective so long as no material removal is required or the cost of any material removal is not paid by the City. Table 5-2 illustrates the compatibility of the Harbor Basin alternatives with the DMMS alternatives. A "yes" entry identifies compatible combinations where the Harbor Basin alternatives and DMMS alternatives are independent of each other. `bio" identifies incompatible combinations. Harbor Basin alternatives that do not generate excess dredged material are not compatible with the seasonal wetland DMMS alternative, since construction of the seasonal wetland requires fill. "Yes, benefit" identifies combinations for which the DMMS alternative provides a benefit to a Harbor Basin alternative by providing for economical dredged material placement. The combination of the "Dredged Material Disposal Concept" and "Operate as DMMS for other harbors" is noted as "possibly" compatible, if demand for fill material were to materialize quickly (e.g., entities wanted to pay for material dredged from the San Leandro harbor). TABLE 5-2 COMPATIBILITY OF HARBOR BASIN ALTERNATIVES WITH THE DMMS ALTERNATIVES DMMS Alternatives Harbor Basin Alternatives No Action Marina Park Aquatic Park Nature Park Dredged Material Disposal Concept No Operate as DMMS Shorebird Seasonal Action for other harbors Habitat Tidal Marsh wetland Yes Yes Yes Yes Yes Yes Yes Yes No Possibly Yesa Yesa Yes, benefit Yes, benefit Yesa Yesa Yesa Yesa No Yes, benefit No No Yes, benefit Yes, benefit Yes, benefit a The DMMS alternative would be constructed without using fill from the Harbor Basin. 17 Although all the DMMS concepts considered for this study may require some level of mosquito control, seasonal wetlands will require the highest level. Mosquito control for this area is provided by Alameda County. San Leandro Marina Harbor Basin 5-6 ESA / 210461 Alternatives Study March 2011