SFPUC 2001 Alameda Watershed Management Plan

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III. ENVIRONMENTAL SETTING AND IMPACTSD. HYDROLOGY AND WATER QUALITY1.0 SETTINGThe SFPUC-owned Alameda Watershed lands are located within the much larger hydrologicboundaries of the greater southern Alameda Creek watershed, which encompasses 175 squaremiles in the East Bay, from Pleasanton to the north to Mount Hamilton to the south (see AlamedaWatershed Management Plan, Figure 1-5, page 1-13). The natural drainage of the greatersouthern Alameda Creek watershed flows from the hills in southern Alameda County andnorthern Santa Clara County, converges at Alameda Creek, flows through the Sunol Valley andNiles Canyon, and eventually drains to San Francisco Bay.The SFPUC-owned lands, referred to as the Alameda Watershed, cover about 56 square miles(36,000 acres) in the western part of this greater watershed. Natural drainage within this area hasbeen altered by the SFPUC water system, but for this discussion of hydrology and water quality,the Alameda Watershed is described under three separate drainage basins: (1) CalaverasReservoir and Alameda Creek above the diversion dam; (2) San Antonio Reservoir; and(3) Alameda Creek below the diversion dam. Figure III.D-1 shows the Alameda Watershed,including the reservoirs, tributary creeks, and the major SFPUC water system facilities.• As described in Chapter II, Project Description, for purposes of the Management Plan, theAlameda Watershed is also divided into “primary” and “secondary” Watershed lands. Theprimary Watershed lands are defined as the areas where local drainage is collected, treated, andused as part of the SFPUC water supply system. Under existing conditions, the primaryWatershed lands drain directly to San Antonio and Calaveras Reservoirs and Alameda Creek,above the diversion dam, which are essentially the same as the first two drainage basins listedabove. In the Management Plan, the primary Watershed also includes drainage to AlamedaCreek just downstream of the Sunol Valley WTP to the site of a proposed water release andrecapture facility that would be used for fisheries enhancement.• Secondary Watershed lands are defined as SFPUC-owned lands that do not drain into the SFPUCwater supply system for drinking water uses. Under existing conditions, these areas drain toAlameda Creek below the diversion dam and are essentially the same as the third drainage basinlisted above. In the Management Plan, the secondary Watershed lands are identified as AlamedaCreek drainage areas downstream from the proposed water release and recapture facility.Figure II-2 shows the primary and secondary Watershed areas of the SFPUC-owned lands.1.1 CALAVERAS RESERVOIR DRAINAGE BASIN AND ALAMEDA CREEKABOVE THE DIVERSION DAMThe natural drainage basin for Calaveras Reservoir includes Arroyo Hondo and Calaveras Creeksfrom the southeast and local drainage areas along the west shore of the reservoir. The SpringValley Water Company began construction of Calaveras Dam in 1913. Storage of water behindNOP 96.223E: Alameda Watershed Management Plan III.D-1 ESA / 930385January 2001
AlamedaCreekNiles Sunol WaterReservoir TempleSunolDam680Sunol PipelineSF SBATurnoutACWDTurnout84VallecitosCreekSouthBay AqueductSF TurnoutBay DivisionPipelinesNos. 1 & 2Nos. 3 & 4SunolAqueductSunol Pump Station andInfiltration GalleriesService to SunolAlameda West PortalNiles-IrvingtonPipelineIrvingtonPortal680Hetch Hetchy AqueductIrvington TunnelTreated WaterPipelineProposed Fish Releaseand Recapture FacilitySunol WaterTreatment PlantSanAntonioPipelineAlameda CreekSan AntonioReservoirJames Turner DamAlameda East PortalSan AntonioPump StationAlameda Creek SiphonsCalaveras PipelineHetch Hetchy AqueductS anAntonioCreekCalaveras RoadGeary RoadAlamedaDiversionDamCalaveras DamAlamedaDiversionTunnelAlamedaCreekAlameda Co.Santa Clara Co.CalaverasReservoirArroyoHondoC alaverasCreekLEGENDSFPUC BoundaryPipelineNot to ScaleSOURCE: Montgomery Watson, 1993; Environmental Science Associates.III.D-2Alameda Watershed Management Plan / 930385Figure III.D-1Alameda WatershedFacilities and System
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San Francisco Planning DepartmentAL
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TABLE OF CONTENTSPageIV.MITIGATION
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TABLE OF CONTENTSPageLIST OF TABLES
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I. SUMMARYcomprehensive set of goal
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I. SUMMARYconstruction of facilitie
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I. SUMMARYOperations and maintenanc
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I. SUMMARYmanagement actions. Addit
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I. SUMMARYlimits and mitigations se
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II. PROJECT DESCRIPTION! to provide
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II. PROJECT DESCRIPTION• southern
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II. PROJECT DESCRIPTION4.0 MANAGEME
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II. PROJECT DESCRIPTIONPolicies WQ3
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II. PROJECT DESCRIPTION! walking of
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II. PROJECT DESCRIPTIONdecisions re
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II. PROJECT DESCRIPTIONraw, untreat
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II. PROJECT DESCRIPTION6.0 PHASING
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II. PROJECT DESCRIPTIONApproximatel
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II. PROJECT DESCRIPTIONC. RELATED P
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II. PROJECT DESCRIPTIONE. ENVIRONME
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II. PROJECT DESCRIPTIONAfter the Ma
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II. PROJECT DESCRIPTIONTABLE II-1 (
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CHAPTER IIIENVIRONMENTAL SETTING AN
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III. ENVIRONMENTAL SETTING AND IMPA
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0 6000FeetSOURCE: EDAW, 1998.Alamed
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IV. MITIGATION MEASURESC. GEOLOGY A
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IV. MITIGATION MEASURES3. In implem
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IV. MITIGATION MEASURESF. AIR QUALI
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IV. MITIGATION MEASURESI. AESTHETIC
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IV. MITIGATION MEASURES2.0 MITIGATI
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V. SIGNIFICANT UNAVOIDABLE ENVIRONM
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CHAPTER VIIALTERNATIVESA. METHODOLO
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VII. ALTERNATIVESTABLE VII-1COMPARA
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VII. ALTERNATIVESTABLE VII-1 (Conti
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VII. ALTERNATIVESWatershed patrols,
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VII. ALTERNATIVESemphasizes ecologi
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VII. ALTERNATIVESunder the preferre
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VII. ALTERNATIVESSan Antonio Creek
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VII. ALTERNATIVESstorage under this
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VII. ALTERNATIVESGeology and Soils.
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VII. ALTERNATIVESthat Alameda Count
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VII. ALTERNATIVESand F propose. Min
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CHAPTER VIIIDRAFT EIR DISTRIBUTION
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IX. APPENDICESAPPENDIX IX.ANOTICE O
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IX. APPENDICESB. SPECIAL-STATUS SPE
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CHAPTER XLIST OF ACRONYMSACWDACWRSA
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X. LIST OF ACRONYMSSRUEBUSFWSUSTsWH
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XI. EIR AUTHORS AND CONSULTANTS; OR
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CHAPTER XIISUMMARY OF COMMENTS AND
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XII. SUMMARY OF COMMENTS AND RESPON
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XII. SUMMARY OF COMMMENTS AND RESPO
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SFPUC 2001 Alameda Watershed Management Plan

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