HomeMy WebLinkAboutOrdinance 56161
0004_20240124_ca29
ORDINANCE NO. 5616
Ordinance of The Council of The City of Palo Alto Approving a Plan for
Improvements to the Palo Alto Baylands as part of the Horizontal Levee
Pilot Project
The Council of the City of Palo Alto does ORDAIN as follows:
SECTION 1. Findings. The City Council finds and declares that:
(a)Article VIII of the Charter of the City of Palo Alto and Section 22.08.005 of the Palo Alto
Municipal Code (PAMC) require that, before any substantial building, construction,
reconstruction or development is commenced or approved, upon or with respect to any land
held by the City for park purposes, the Council shall first cause to be prepared and by ordinance
approve and adopt a plan therefor.
(b)The Horizontal Levee Pilot Project (Project) is part of the Marsh Front Trail (Trail). The
Project site is located in the City’s Baylands, which is dedicated parkland (See PAMC § 22.08.020
et seq.) Based on the current habitat quality of the Project site, the location has been identified
as in need of enhancements to better provide refugia for many species including the endangered
Salt Marsh Harvest Mouse.
(c)The City of Palo Alto intends to authorize the construction of a horizontal levee pilot
system that will enhance habitat, maintain public access, provide educational opportunities,
provide regionally-beneficial information on nature-based sea level rise adaptation options, and
beneficially reuse treated wastewater.
(d)The Plan of improvements shall comprise, as follows:
(1)The Project will construct a horizontal levee along Harbor Marsh and install along
Embarcadero and Harbor Roads an underground treated wastewater pipeline for
irrigation of the horizontal levee. The horizontal levee will be planted with various native
plants to restore diverse transitional habitats including freshwater marsh, wet meadow,
and riparian scrub. The Project will re-align a portion of the Trail as required to
accommodate the horizontal levee and reconnect habitats. The Project will install
educational signage and provide opportunities for public participation in community
science activities such as photo-point monitoring of habitat restoration and water quality
testing.
(2)The Project will require temporary rerouting of a portion of the Marsh Front Trail
and temporary traffic restrictions to a portion of Harbor Road to accommodate
construction.
DocuSign Envelope ID: D01193CB-AAE8-4913-83F3-33D7A5B342D7
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0004_20240124_ca29
(e)The Project described above and as otherwise depicted in the attached exhibit is
consistent with recreation and conservation purposes
(f)The Council desires to approve the Plans for the Project described above and as depicted
in Exhibit "A".
SECTION 2. The Council hereby approves the Plan for construction of the Horizontal
Levee Pilot Project as described in this Ordinance.
SECTION 3. City of Palo Alto is the Lead Agency for the Project under the California
Environmental Quality Act (CEQA) and finds that the Project is categorically exempt under CEQA
Section 15333, Class 33 for small habitat restoration projects.
SECTION 4. This ordinance shall be effective on the thirty-first day after the date of its
adoption.
INTRODUCED: January 22, 2024
PASSED: February 5, 2024
AYES: BURT, KOU, LAUING, LYTHCOTT-HAIMS, STONE, TANAKA, VEENKER
NOES:
ABSENT:
ABSTENTIONS:
ATTEST:
____________________________ ____________________________
City Clerk Mayor
APPROVED AS TO FORM: APPROVED:
____________________________ ____________________________
Chief Assistant City Attorney City Manager
____________________________
Director of Community Services
DocuSign Envelope ID: D01193CB-AAE8-4913-83F3-33D7A5B342D7
Palo AltoAirport
HarborMarsh
ByxbeePark
Palo AltoRWQCP
SOURCE: USGS 7.5' Topographic Quadrangle (Mountain View, CA); ESA 2022
0 650 1,300
Feet
Palo Alto Horizontal Levee Pilot Project. D201801306Figure 1Project Location
Project Boundary
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EXHIBIT A
DocuSign Envelope ID: D01193CB-AAE8-4913-83F3-33D7A5B342D7
Install pump in effluentjunction box and connect
to new effluent line
Palo AltoRWQCP
Byxbee Park
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Palo AltoAirport
SOURCE: ESRI 2021; ESA 2022
0 100 200
Feet
Palo Alto Horizontal Levee Pilot Project. D201801306Figure 2Project Components
Project Boundary
Project Component
Horizontal Levee Area
Access
Effluent Line in
Roadway
Equipment Staging Area
Contractor Parking Area
EXHIBIT A
DocuSign Envelope ID: D01193CB-AAE8-4913-83F3-33D7A5B342D7
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SOURCE: ESRI 2021; ESA 2022
0 30 60
Feet
Palo Alto Horizontal Levee Pilot Project. D201801306Figure 3Draft Horizontal Levee Plan
Legend
Project Boundary
Major Contour 2'
Minor Contour 0.5'
Existing Overhead Power Lines
Demo Abandoned W4 Line
Demo 18-Inch Storm Drain
Preserve 18-Inch Storm Drain
Preserve 18-Inch Renzel MarshPipeline
New 18-Inch Culvert
New 4-Inch Effluent Line
New Distribution Lateral
,,,New Distribution Trench
Existing Renzel Marsh IntakeStructure
Remove Existing Trail
Brackish Marsh (Clear & Grub,No Grading)
@
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Freshwater Marsh
Freshwater Swale
Relocated Marsh Front Trail
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Riparian Bufferùù
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Riparian Scrub (Transition)
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°°°°°°Subsurface Treatment Zone
Upland (Levee and Staging AreaSeeding)
Palo Alto RWQCP
Harbor Marsh
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EXHIBIT A
DocuSign Envelope ID: D01193CB-AAE8-4913-83F3-33D7A5B342D7
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Figure 4
Horizontal Levee Sections
Palo Alto Horizontal Levee Pilot Project . D201801306
EL
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STATION
0
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15
20
25
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0+00 0+50 1+00 1+50 2+00 2+26
12'
BERM
30'
TREATMENT AREA
EMBARCADERO ROAD
8'
TRAIL
EL
12'
EL 10'
EL
9'
EL
8'MATCH GRADE
EL 7'±
2' THICK
SAND FILTER (NOTE 3)
EFFLUENT LINE
SEE MECHANICAL PLANS
OVER EXCAVATE
& PLACE 1' LAYER
OF COARSE
NATIVE MATERIAL
APPROX. (E) EDGE
OF MARSH @ EL 8'
EL 13'
3' THICK
DISTRIBUTION
TRENCH
SHT C06 DTL 1
HORIZONTAL LEVEE
DESIGN GRADE, TYP
BERM KEYWAY
COARSE MATERIAL (NOTE 4)
1' THICK SUBSURFACE
TREATMENT LAYER, TYP (NOTE 2)
EXISTING GRADE, TYP
11
1
1
115
3
1
130
1 ~15 1~10
1
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HABITAT SLOPE ~68' TO 93'
1
2
SWALE
(N) FENCE, TYP
(E)
O
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TYPICAL SECTION - RIDGES/HIGH & WIDE
PROFILE SCALE: 1" = 10' H
1" = 5' V
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0+00 0+50 1+00 1+50 2+00 2+11
EMBARCADERO ROAD
12'
BERM
30'
TREATMENT AREA
8'
TRAIL
EL 11.5'
EL
9.5'EL 9'
CONFORM TO
(E) TIDAL
CHANNEL
OVER EXCAVATE & PLACE 1'
LAYER OF FINE NATIVE MATERIAL
APPROX. (E) EDGE
OF MARSH @ EL 8'
EL 13'
2' THICK
SAND FILTER (NOTE 3)BERM KEYWAY
EXISTING GRADE, TYP
HORIZONTAL LEVEE
DESIGN GRADE, TYP
TOP OF BANK
(BEYOND)
BASE SWALE/
DEPRESSION
1
1
11
FINE MATERIAL (NOTE 4)
1' THICK SUBSURFACE
TREATMENT LAYER, TYP (NOTE 2)
115
3
1
1 20
1 15
1 15
1
2
HABITAT SLOPE ~68' TO 93'
SWALE
EFFLUENT LINE
SEE MECHANICAL PLANS
(N) FENCE, TYP
(E)
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TYPICAL SECTION - SWALES & DEPRESSIONS
PROFILE SCALE: 1" = 10' H
1" = 5' V
1. SEGREGATE FINE AND COARSE MATERIAL ENCOUNTERED DURING EXCAVATION OF SITE TO
SUBGRADE. DURING FILL OPERATIONS, PLACE COARSE MATERIAL ON THE RIDGES AND FINE
MATERIALS IN THE SWALES.
2. SUBSURFACE TREATMENT LAYER COMPRISED OF A BLEND OF DRAIN ROCK AND COMPOSTED
WOOD CHIPS.
3. SAND FILTER COMPRISED OF A BLEND OF SAND AND WOOD CHIPS.
4. COARSE AND FINE MATERIAL INCLUDES A BLEND OF NATIVE MATERIAL WITH COMPOSTED WOOD
FINES.
5. FUTURE FLOOD CONTROL LEVEE MAY OR MAY NOT BE CONSTRUCTED, BUT THIS LAYOUT PLANS
FOR ITS POTENTIAL SPACE SHOULD IT BE CONSTRUCTED.
6. ALL ELEVATIONS ARE ON NORTH AMERICAN VERTICAL DATUM 1988 (NAVD88).
NOTES
SEE FIGURE 5
HARBOR ROAD
HARBOR ROAD
Draft
EXHIBIT ADocuSign Envelope ID: D01193CB-AAE8-4913-83F3-33D7A5B342D7
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Figure 5
Distribution Detail
Palo Alto Horizontal Levee Pilot Project . D201801306
1A
-SECTION
DISTRIBUTION CONNECTION AND TREATMENT ZONE MATERIAL
SCALE: 1" = 2'
DISTRIBUTION
LATERAL, TYP
QUICK4 EQUALIZER 24 LOW
PROFILE INFILTRATOR, OR
APPROVED EQUAL
~0.5' SOIL CAP
FILTER FABRIC 1.5'± SOIL WITH
COMPOSTED
WOOD FINES
1.0' TREATMENT LAYER
DRAIN ROCK & COMPOSTED WOOD CHIPS
FILTER FABRIC
0.5' SAND AND WOOD CHIPS
~4.5' (VARIES)
NEW TRAIL
EFFLUENT SUPPLY LINE
SEE MECHANICAL PLANS
DISTRIBUTION BOX
SEE MECHANICAL PLANS
SCALE
0
FEET
1"=2'
2 1 2 4
Draft
EXHIBIT ADocuSign Envelope ID: D01193CB-AAE8-4913-83F3-33D7A5B342D7
Certificate Of Completion
Envelope Id: D01193CBAAE8491383F333D7A5B342D7 Status: Completed
Subject: DocuSign: ORD 5616 - Baylands.pdf
Source Envelope:
Document Pages: 7 Signatures: 5 Envelope Originator:
Certificate Pages: 2 Initials: 0 Vinhloc Nguyen
AutoNav: Enabled
EnvelopeId Stamping: Enabled
Time Zone: (UTC-08:00) Pacific Time (US & Canada)
250 Hamilton Ave
Palo Alto , CA 94301
Vinhloc.Nguyen@CityofPaloAlto.org
IP Address: 199.33.32.254
Record Tracking
Status: Original
2/8/2024 3:39:46 PM
Holder: Vinhloc Nguyen
Vinhloc.Nguyen@CityofPaloAlto.org
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Signer Events Signature Timestamp
Caio Arellano
Caio.Arellano@CityofPaloAlto.org
Chief Assistant City Attorney
City of Palo Alto
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Kristen O'Kane
Kristen.O'Kane@CityofPaloAlto.org
Assistant Director
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Ed Shikada
Ed.Shikada@CityofPaloAlto.org
Ed Shikada
City of Palo Alto
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Greer Stone
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Vice Mayor
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Mahealani Ah Yun
Mahealani.AhYun@CityofPaloAlto.org
City Clerk
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