Conclusion: As described in the WSIP Program EIR, a significant impact on meadow and alluvial features in the reach of the Tuolumne River between Hetch Hetchy Reservoir (O’Shaughnessy Dam) and Don Pedro Reservoir, particularly within the Poopenaut Valley would result from diversions of water being held in the Hetch Hetchy Reservoir. Thus, the proposed water transfer agreement with OID, in combination with the SFPUC diversions addressed in the WSIP Program EIR would result in a cumulatively significant impact, although mitigation measures set forth in the WSIP Program EIR, including a program of controlled releases (WSIP FEIR Mitigation Measure 5.3.7-2), would be implemented to mitigate impacts of that project to a less than significant level.
The text at the bottom of page 6-21 would be revised to read as follows:
Contributions of DSP, DSP-V, CPP, and CPP-V Scenarios to Cumulative Impacts Sensitive upland habitat and special status plant and butterfly species occur within the Project Site only on Icehouse Hill, which is being preserved in open space. In addition, specific mitigation is proposed for bird strike impacts to increase nighttime visibility of buildings. Thus, Project Site development would not make a cumulative considerable contribution to the significant cumulative impact described above in relation to habitats within the vicinity of the Baylands.
Because adverse impacts on meadow and alluvial features in the reach of the Tuolumne River between Hetch Hetchy Reservoir (O’Shaughnessy Dam) and Don Pedro Reservoir, particularly within the Poopenaut Valley, would result from diversions as small as 2 mgd, the amount of the diversion in the proposed water supply agreement, a significant impact was determined to result from the proposed water supply agreement.
Conclusion: Because Project Site development would not result in loss of sensitive upland habitat areas or impact special status species, it would not make a cumulatively considerable contribution to the significant cumulative impact described above. However, a significant impact was determined to result from the proposed water supply agreement. The proposed water supply agreement would make a cumulatively considerable contribution to the significant cumulative impact described for the reach of the Tuolumne River between Hetch Hetchy Reservoir (O’Shaughnessy Dam) and Don Pedro Reservoir. However, implementation of the mitigation measures aimed at providing pulse flows through the Poopenaut Valley by the SFPUC (WSIP EIR) and by the City of Brisbane (Baylands EIR) would reduce cumulative impacts of the proposed water supply agreement on biological resources within the Poopenaut Valley to less than significant.
Future Project-Level CEQA Review
Additional, project-level CEQA review of the proposed OID water transfer would be required prior to its consideration by the City. In crafting the water transfer agreement, Brisbane would work closely with OID, MID, and the SFPUC to understand their detailed system operations and conveyance capacity availability and develop the draft operational details of how the transfer would be implemented through MID and the SFPUC and would evaluate the proposed operations