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