Napa Plant Site Restoration by wanghonghx

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									Napa Plant Site Restoration
               Napa Sonoma Marsh
             Restoration Group Meeting

USGS San Pablo Field Station Office, Building 505, Mare Island




                     February 20, 2007
 Presentation
• Project Review
   – Site Description
   – Project Overview
   – Resolving Airport Safety Concerns
• Permitting Updates
   – EIR
   – BCDC, Corps and Water Board permits
• Design Update
   – Ponds 9&10
   – Wash Ponds
   Regional
    Setting
• 1,460-acre site
• On Napa River
  floodplain
• DFG purchased land
  from Cargill Salt Co.
  3/14/03
• Fits into DFG lands
  extending on both
  sides of river
Existing Habitats
Dredged Material

Mudflat (1 acre)

Tidal Marsh (12 acres)
Seasonal Wetland
Pickleweed Community (5 acres)

Seasonal Wetland
Ecotone Community (30 acres)

Salt Pond (1,142 acres)

Levee (151 acres)

Water Conveyance Channels
(64 acres)

Tidal Channels (13 acres)

Uplands (42 acres)
Site
Tour
 Site Tour




Ponds 9 and 10 (from south)
                Site Tour

                            Wash Pond, W-2




Pump Number 2
                                       Site Tour




                                          Tidal marsh and mudflat outboard
                                          of the salt pond levees




Seasonal wetland habitats-looking NE
               Site Tour




48” culvert conveys water from drainage
channel to Napa River estuary (looking east)
Site Tour – Breach Locations
     CB 8 to Napa River




                               Pond 9 to Fagan Slough




Wash Pond 1 to Barge Channel
                                               Phase-out Operation
                                               •   Began 2003
                                               •   8 year desalination period
                                               •   Reducing plant operations
                                                   footprint
                                               •   Ponds 9,10 and Wash
                                                   Ponds ready for restoration
                                                   in 2007
                                               •   Southern ponds ready in
                                                   approx. 2010




Salinity (February-March 2006)
Ponds 9 & 10 = 36 ppt
B-1 & B-2 = 48-54 ppt B-3 = 103-107 ppt
Crystallizers = 146-155 ppt Unit 3 88-92 ppt
 Restoration Project Goals
• Restore tidal habitat
• Promote environmental benefit and reduce
  impacts
• Provide recreational opportunities
• Minimize ecological risks
• Maintain flood protection
• Maintain current level of vector management
• Create self-sustaining / cost efficient design
           1856
          Survey
• Restoration design uses
  historic slough pattern
• Sloughs visible except in
  crystallizer beds
• 1850s diked for hay
  production & cattle
  grazing
• Fagan Slough width
  decreased after ponds 9
  & 10 diked
           Project
           Design

• Restores tidal action to
  over 1,000 acres

• Benefits endangered
  species and other
  wildlife

• Provides recreation
  and educational
  opportunities
                       Public
        (2007)
                       Access
                 •   Small craft hand
                     launching area

                 •   Hiking and bicycle trails

                 •   Possible future site of
(2010 - 2012)
                     environmental education
                     center
Napa County
  Airport
 Operations
and Runway
   Safety
  Features
       Napa County Airport
        Issues & Solutions
Process
   – 6 meetings between July 2005 & Aug. 2006
   – Identified and resolved County’s concerns

Issue: Drainage and flooding
   – Add second culvert & raise levee to 10 ft
   – Fagan Creek not affected by project (caused 12/31/05 flooding)
   – No Name Creek overflow can discharge to Pond 10

Issue: Bird strike hazard from birds in managed pond
   – Eliminated managed pond from design

Issue: Runway 6/24 Safety Area
   – DFG adding 8 acres of fill to help County avoid wetlands fill
   – County’s future fill requirements will affect drainage
                                           As salt making stops, bird use increases
                               Figure 3. Bird Use in Pond Units by Year and Relative Hazard Score with Annual Maximum Salinity
                               2003                        2004                      2005                      2006
                  3500                                                                                                            350



                  3000                                                                                                            300



                  2500                                                                                                            250




                                                                                                                                        Salinity (parts per thousand)
                               Vultures (64)
Number of Birds




                               Geese (55)
                  2000                                                                                                            200
                               Cormorants (54)
                               Ducks (39)
                               Herons (27)
                  1500         Hawks (25)                                                                                         150
                               Gulls (24)
                               Horned lark (17)
                  1000         Shorebirds (10)                                                                                    100
                               Kestrel (9)
                               Owls (23)
                               CB 1-9 salinity
                  500                                                                                                             50
                               B & Unit3 salinity
                               9 &10 salinity

                    0                                                                                                             0
                         9 & 10 B-1, B-2, CB 1-9    9 & 10 B-1, B-2, CB 1-9   9 & 10 B-1, B-2, CB 1-9   9 & 10 B-1, B-2, CB 1-9
                                 B-3 &                      B-3 &                     B-3 &                     B-3 &
                                 Unit 3                     Unit 3                    Unit 3                    Unit 3
                                    Bird Strike Hazard
                              Analyzing the Potential, Creating Solutions
                                        Number of birds in Open water (1a) and
                                        Vegetated (2a) in Napa Sonoma Marsh former
35 reported incidents                   salt ponds
   (1/01 thru 6/06)             25000


•   No damage reported in 29             2003                 2004                2005
•   Minor damage in 2                   2003                   2004                2005
                                20000

•   Undetermined damage in 3
                                                             Diving ducks
•   Substantial damage in 1
                                15000




Incident characteristics                                                         Dabbling
                                10000
•   27 incidents on runway                                                       ducks
    18/36 (8 on 6/24)
•   17 incidents planes were    5000

    on ground in
•   7 incidents at 1-50 ft
                                   0
    above ground
                                        1a      2a      1a        2a        1a       2a
     Airport Recap

•   Expedite revegetation
     – Ponds 9&10 bottom elev. 1.8-3.6
       ft. (NAVD 88)
     – Pond 10 bottom raised: 3.5 – 4 ft.
•   Flood control: tidal & fluvial
     – Raise Pond 10 levee to 10 feet
     – Add 2nd culvert, No Name Creek
•   Add 8 ac fill for RSA to 7 ft.
     – Reduces airport’s Corps
       permitting load
•   Runway 18R/36L instrument
    platform approx. 8.4 feet
        Permitting Update
RWQCB
  – Meeting Scheduled for 3/8/07 to Discuss Comments
  – Anticipate Going to the Board in June 2007


Corps 404
  – David Wickens Assigned to Permit Application
  – Section 7 Consultation request


BCDC
  – Meeting this week
Design Update
               PONDS 9 & 10




  WASH PONDS
 Restoration Project Goals
• Restore tidal habitat
• Promote environmental benefit and reduce
  impacts
• Provide recreational opportunities
• Minimize ecological risks
• Maintain flood protection
• Maintain current level of vector management
• Create self-sustaining / cost efficient design
       Ponds 9 & 10 PS&E
95% Submittal: September 29, 2006
Final Submittal: March, 2007
                         Ponds 9 & 10 PS&E
                             Design Components



•   Tidal Channel &
    Breach
•   Internal Levee
    Lowering
•   Perimeter Levee
    Lowering
•   Perimeter Levee
    Improvement
•   Ecotone & RSA
•   Pond Bottom
    Grading
•   Airport Levee Fill
         Wash Ponds PS&E
50% Submittal: June 15, 2006
95% Submittal: January 26, 2006
Final Submittal: March 2007
Wash Ponds PS&E
    Existing Conditions
           Wash Ponds PS&E
                Changes Since 50% Submittal

•   Geotechnical Investigation
•   Well Investigation Results
•   Water Supply Summary
•   Revised Access Road Alignment
•   Majority of Public Access Features pushed to Phase 2
•   Coordination with PG&E
•   Coordination with County DOT
Wash Ponds PS&E
  Geotechnical Investigation
Wash Ponds PS&E
  Geotechnical Investigation
Wash Ponds PS&E
    Well Investigation
            Wash Ponds PS&E
Water Supply Summary:
•   City Water System: Outside Development Limits
•   Freshwater Well Unlikely
•   Combination System Recommended
    –   Rainwater Cistern
    –   Greywater System
    –   Shallow Brackish Well with Reverse Osmosis
    –   Trucking to Existing Tank
Wash Ponds PS&E
 Combination System – Sustainability
                      Wash Ponds PS&E
                          Design Components


•   Tidal Channel &
    Breach
•   Internal Levee
    Lowering
•   Perimeter Levee
    Lowering
•   Perimeter Levee
    Improvement
•   Ecotone
•   Pond Bottom
    Grading
•   Access Road
    Realignment
•   Trail & Public
    Access Features
          Wash Ponds PS&E
Coordination:
•   PG&E – Ongoing Relocation Design
•   County DOT – Ongoing Coordination for Green Island
    Road
     Timeline: On schedule for
       Construction in 2007
• Design Completed: March 2007
• Out to Bid: Early Summer 2007
• Contractor Selection: Summer 2007
Questions

								
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