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Peyton Slough Remediation Project
Managing for Changing Tides:
Restoring a Tidal Marsh in an
Urbanized
October 30, 2014
Presentation Contents
• Constraints and
Complications – Existing Infrastructure
– Flooding
– Wildlife Needs
– Permit Requirements
– Tides
– Rainfall/snow melt
– Discharges/Runoff
– Water Quality-Algae, DO
– Invasive Plants
– Neighboring Projects
– Marsh Settlement
• Adaptive Management
Activities – Changing Gate
– Regrading
– Planting
– Erosion Protection
– Power repair
– Subsidence Fill
– Build up levee road
– Water level readings
BACKGROUND
Peyton Slough Site Contamination Addressed by Remediation
• Elevated Copper and Zinc in
Slough Sediments
• Periodic Dredging
– Side-cast piles
– Contaminants also occur on Marsh
Plain
• Prevent Re-contamination
Remediation – A Step-Wise Process
1. Excavate new
slough using an
already existing
drainage
2. Remove Side-
Case Dredge
Piles 3. Cap Old Slough
4. Restore Disturbed
Areas
CONSTRAINTS AND
COMPLICATIONS
July 25, 2013
Regulatory Requirement – Grow Pickleweed
Growing Pickleweed
May 2006
Pickleweed has elevation tolerance within 0.4 ft of MHHW,
overlapping with several species
Factors influencing water level: Elevation
South Marsh/McNabney are lower elevation than North Marsh
Factors influencing water level: Elevation
HOWL
MSL •
7
65
6
5.5
5
4-5
= constructed marsh plain =undisturbed marsh plain
p,_,,·ton Milrslr ' "/\'orlh
Tide gate
Flooding
Railroad
(Culvert)
Subsided Road over
Historic Slough
Taco Truck
Pipelines
Nests
Discharges
• Watershed Runoff
• MVSD Discharges
• Shell Stormwater
• I-680 Runoff
• CCC Martinez Reservoir Discharges
Railroad Car Bridge Restriction Railroad Car Bridge Restriction
Algae
ADAPTIVE MANAGEMENT
Lots of Monitoring (and Modeling) ~bets ef MeRiteFiA§ (aA8 MedeliA§)~
"' °' ..., ro
CJ
°' "C ·-I-c °' Q.
0
'*'
--TG1Posit ion --TG2Posit ion --TG3Posit ion
------------ Pred icted at Port Ch icago NGVD - -waterfront road shou lder __._ Kelly's observation- East Channe l
- Peyton McNabney- NGVD? - East channel- NGVD --Tide gate NGVD 80 +-~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~-!
- - waterfront road center - - south spread area
i ! I, ; ~ ! : ~ ! I ~ ~ : : 70 +-~~--+-++-,_._.-+-~~-'-'-,___,_._~~-;.-<~++-<~-+-....._..,..._.___,_....~-+++-i-+++-H'~~__,......_......_+->_._,_...----<......_.-+---._.._..__,__-+-1---+-+-+4< ........ _., m4-l-I~~
60
so
40
30
20
6
4
2
0
-2
-4
-6
-
-QJ > QJ -... QJ ..., nJ
~ ........ -QJ ..., nJ b.O QJ
""C ·,;:; ..., nJ -c l!> > z
Adaptive Management
• Replacing tide gate
• Regrading
• Supplemental
Planting
• Headcut Repairs
• Bulkhead Repair
Sept. 21, 2010
2014
Change in Tide Gate Management Change in Tide Gate Management
90
80
70
60
50 c: QI Q. 0 -c: 40 QI CJ ~ QI
Q.. 30
20
10
0 1/26
-10
2013 Tide Gate Activity - Tide Gate Position - UpStreamlevel
6
5~ u. .5 :0-QI
4~ :9 iii CJ -0 .s
3 ~ iii > QI
> ~
2 (ij 0:::
1
0132/15/2013 317/2013 3/27/20134/16/2013 5/6/2013 5/26/20136/15/2013 7/5/2013 7/25/20138/14 013
Date
Bulkhead Erosion Repairs
Bulkhead erosion repair (3/07)
• Rock bags at bulkhead
perimeter
• Emergent plant log rolls (200
LF) and clumps
• Redirect drainage, 60 LF ditch
Standing in eroded drainage
Stakeholder Involvement Stakeholder Involvement
• TESORO
SOLVAY
PL ALL A~1£RICAN PIPELI E
Managing a Marsh in 10 (Not So Easy) Steps
1. Follow the Tides
2. Know Your Marsh Plain Elevation
3. Monitor Water Levels
4. Make Friends with Your Neighbors
5. Build the Appropriate Gate Structure
6. Consider Circulation
7. Know the Dischargers Upstream
8. Monitor the Plants and Wildlife
9. Be Adaptable
10. Never Stop Learning
Thank you