baylands boardwalk replacement project …
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BAYLANDS BOARDWALK REPLACEMENT PROJECT ARCHITECTURAL REVIEW BOARD (ARB) MAJOR PACKAGE
1 | VICINITY MAP/PROJECT DATA 4 | STRUCTURE ELEVATIONS AND SECTIONS
2 | NEIGHBORHOOD CONTEXT 5 | CONCEPTUAL CONSTRUCTION SEQUENCE
3 | SITE PLAN 6 | TREE PROTECTION PLAN
BAYLANDS BOARDWALK | ARB SUBMITTAL – AUGUST 16, 2017 VICINITY MAP/PROJECT DATA 1.1
PROJECT DATA Project Address Situated in the Baylands public marshland, to the northwest of the existing Lucy Evans Baylands Interpretive Center (Nature Center) located at 2775 Embarcadero Way, Palo Alto, CA 94303 Project Owner City of Palo Alto Engineer: Anthony Notaro -Biggs Cardosa Associates Representative: Elizabeth Ames, Public Works Dept., Sr. Project Manager Zone: Land Use Designation: PF (D) P; CL; MISP Existing Improvement(s): The existing timber boardwalk structure extends roughly 850 feet north across the Harriet Mundy Marsh towards the San Francisco Bay from the Lucy Evans Baylands Nature Interpretive Center and the San Francisquito Creek Trail. The existing boardwalk structure was constructed in 1969 and rehabilitated and widened by the City in 1980. The existing boardwalk was closed in 2014 due to structural deficiencies and safety concerns. The driven timber posts and supports have gradually decayed and broken over the years due to the elements and impacts from the corrosive tidal saltwater. The once level boardwalk is now undulating along its surface and listing noticeably to the east in several locations due to failed substructure elements. Total Site Area: 25,007 SF
Existing Deck Area: 3,655 SF Proposed Deck Area: 4,815 SF Area Added: 1,160 SF
Existing Deck Elev.: 9.9 feet (NAVD88) Proposed Deck Elev.: 13.5 feet (NAVD88) Green Design Elements Potential Green Elements being considered:
The Boardwalk replacement project will avoid the use of pressure treated Douglas fir (PTDF) timber due to concerns with potential chemical treatment effects (most notably arsenic and copper) on the marsh environment.
Assessor Parcel Map
Location Map
Comprehensive Plan
BAYLANDS BOARDWALK | ARB SUBMITTAL – AUGUST 16, 2017 NEIGHBORHOOD CONTEXT 2.1
PHOTOGRAPHIC DISPLAY / NEIGHBORHOOD CONTEXT
BAYLANDS BOARDWALK | ARB SUBMITTAL – AUGUST 16, 2017 NEIGHBORHOOD CONTEXT 2.2
PHOTOGRAPHIC DISPLAY / NEIGHBORHOOD CONTEXT (Cont)
BAYLANDS BOARDWALK | ARB SUBMITTAL – AUGUST 16, 2017 NEIGHBORHOOD CONTEXT 2.3
PHOTOGRAPHIC DISPLAY / NEIGHBORHOOD CONTEXT (Cont)
Location of Existing Palo Alto Baylands Boardwalk
BAYLANDS BOARDWALK | ARB SUBMITTAL – AUGUST 16, 2017 SITE PLAN 3.1
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BAYLANDS BOARDWALK | ARB SUBMITTAL – AUGUST 16, 2017 SITE PLAN 3.2
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BAYLANDS BOARDWALK | ARB SUBMITTAL – AUGUST 16, 2017 SITE PLAN 3.3
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BAYLANDS BOARDWALK | ARB SUBMITTAL – AUGUST 16, 2017 SITE PLAN 3.4
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BAYLANDS BOARDWALK | ARB SUBMITTAL – AUGUST 16, 2017 SITE PLAN 3.5
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BAYLANDS BOARDWALK | ARB SUBMITTAL – AUGUST 16, 2017 SITE PLAN 3.6
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BAYLANDS BOARDWALK | ARB SUBMITTAL – AUGUST 16, 2017 SITE PLAN 3.7
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BAYLANDS BOARDWALK | ARB SUBMITTAL – AUGUST 16, 2017 ELEVATIONS AND SECTIONS 4.1
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BAYLANDS BOARDWALK | ARB SUBMITTAL – AUGUST 16, 2017 ELEVATIONS AND SECTIONS 4.2
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BAYLANDS BOARDWALK | ARB SUBMITTAL – AUGUST 16, 2017 ELEVATIONS AND SECTIONS 4.3
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BAYLANDS BOARDWALK | ARB SUBMITTAL – AUGUST 16, 2017 ELEVATIONS AND SECTIONS 4.4
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BAYLANDS BOARDWALK | ARB SUBMITTAL – AUGUST 16, 2017 ELEVATIONS AND SECTIONS 4.5
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BAYLANDS BOARDWALK | ARB SUBMITTAL – AUGUST 16, 2017 ELEVATIONS AND SECTIONS 4.6
COLORS AND MATERIALS
The following materials and colors are proposed for the replacement Boardwalk: MATERIALS In accordance with City and public input, the replacement Boardwalk will be constructed of timber elements to match the style and character of the existing Boardwalk structure. ALASKAN YELLOW CEDAR The timber structural elements (piles/posts, joists, bracing) are proposed to be constructed of Alaskan Yellow Cedar (AYC). AYC is highly durable and is in relatively common use for timber structures in marine environments: AYC is notable for its durability and longevity. AYC is naturally resistant to rot, decay, insect damage
and, in saltwater applications, to marine borers. AYC is considerably harder than most commercially
available softwoods. AYC resists splitting and slivering, and it is highly
resistant to wear.
REDWOOD Heart Redwood timbers will be utilized for all timber deck and railing elements. Production of redwood lumber is limited to California, but the market is nationwide. The wood is easy to work, generally straight grained, and shrinks and swells comparatively little. It is also exceptionally stable, with very little shrinkage or seasonal movement. Redwood’s durability is entirely natural. The same tannins and unique cell structure that gives redwood its warm tones and exemplary strength make it naturally resistant to insects, decay, water and even fire. Redwood has proven durability in outdoor projects such as decking, fencing and outdoor furniture. The use of Redwood Decking would match the decking of the adjacent, recently renovated, Nature Center.
METAL COMPONENTS
TIMBER CONNECTORS: All metal connectors for mounting and connecting timber elements will be stainless steel and painted prior to installation.
TIMBER FASTENERS: Coated deck screws and/ or stainless steel screws will be used for all timber to timber connections and to mount metal connectors.
RAPTOR DETERRENT ROLLERS: Raptor deterrent rollers will be made of extruded aluminum with aluminum mounting brackets with stainless steel fasteners. COLORS In accordance with the “Site Assessment and Design Guidelines for Palo Alto Baylands Nature Preserve,” all wood finishes will consist of Olympic 911 Natural Gray Stain and all metal components will be painted with Benjamin Moore Sandy Hook Gray (HC-108).
Benjamin Moore Sandy Hook Gray
Olympic 911 Natural Gray Stain
BAYLANDS BOARDWALK | ARB SUBMITTAL – AUGUST 16, 2017 ELEVATIONS AND SECTIONS 4.7
INTERMEDIATE OVERLOOKS AND OBSERVATION PLATFORM The replacement Boardwalk will include an Observation Platform at the San Francisco Bay end of the Boardwalk to provide a panoramic view of the bay. The replacement Boardwalk will include four Intermediate Overlooks along its length. The existing Boardwalk has 2 overlooks. The overlooks will be spaced along the Boardwalk, and will serve to further improve access, allowing clearance for multi-mode users in wheelchairs to turn around and pedestrians to pass by. Both the Observation Platform and the Intermediate Overlooks will accommodate a 30 inch by 48 inch clear area for wheelchair users and a bench with arm rests.
Bench Concept #1 Bench Concept #2 The intermediate overlooks and observation platform will be designed to support exterior interactive exhibits to engage visitors in salt marsh phenomena. Interactive exhibits and signage will be provided under a separate contract. The Boardwalk Replacement Project will include sloped timber sign rails at the Intermediate Overlooks and Observation Platform to serve as a platform for attaching the interpretive signage in the future.
Interpretive Signage Samples
BAYLANDS BOARDWALK | ARB SUBMITTAL – AUGUST 16, 2017 ELEVATIONS AND SECTIONS 4.8
RAILINGS AND DECKING A redwood timber railing, 3.5 feet minimum in height, will be erected on each side of the boardwalk. The railing will take their style and character from the timber railings of the Nature Center. The railings will be customized to meet the structural requirements of the long straight Boardwalk. The railing will be designed to be constructed in panels to minimize on site construction and to speed erection of the railing within the limited work windows provided by the project (See “Project Constraints”). Intermittent viewing panels will be provided at the intermediate overlooks and observation platform to enhance visibility for wheelchair users and small children. In consultation with the US Fish and Wildlife Service (USFWS), in order to minimize the potential for birds to strike the panels, each panel will be no more than 18 inches in width and will contain either glass with bird-safe design patterns or wire mesh.
The boardwalk’s railings will be topped by raptor deterrent rollers such as those shown in the adjacent photo, which will function to minimize the potential for predation of endangered species that are present at this location (e.g., salt marsh harvest mouse and the Ridgway’s rail) by preventing raptors from perching on the railings to scan for prey. Such rollers are in place at other locations in the area, including the boardwalk at Alviso County Park.
Existing Bird Perch Deterrent Rollers on the Boardwalk at Alviso County Park.
Redwood is also proposed to be used for the deck of the boardwalk, which is the material used for the railings and deck of the recently renovated Nature Center. Interpretive signage on the railings will be installed as part of a future project.
Existing Glass Viewing Panel at Nature Center Wire Mesh Viewing Panel Option
Existing Railing at Nature Center
Proposed Railing at Boardwalk
Glass Frit Pattern Option Glass Etching Pattern Option
BAYLANDS BOARDWALK | ARB SUBMITTAL – AUGUST 16, 2017 CONCEPTUAL CONSTRUCTION SEQUENCE 5.1
CONCEPTUAL CONSTRUCTION SEQUENCE
Task 1: Site Preparation:
1.1 Install temporary marsh mats to provide equipment and material access to the near end of the Boardwalk.
1.2 Remove existing railing, reinforce the existing Boardwalk and modify the deck width as required to accommodate construction operations
Task 2: Post/ Pile Installation: 2.1 Vibrate/push lower
segment of timber post/ pile to ground line
2.2 Splice upper segment of timber post/ pile to partially installed lower segment of timber post/ pile
2.3 Vibrate/push spliced timber post/ pile to specified tip elevation and cutoff top of post/ pile to cutoff elevation
Task 3: Sub/Superstructure Installation 3.1 Install timber bent cap 3.2 Install timber cross bracing 3.3 Install timber rim joists and
blocking 3.4 Install timber decking 3.5 Remove existing
Boardwalk to mudline when no longer required for construction operations
Task 4: Timber Railing Installation
4.1 Install timber railing on completed superstructure
4.2 Remove marsh mats 4.3 Complete site clean-up
BAYLANDS BOARDWALK | ARB SUBMITTAL – AUGUST 16, 2017 TREE PROTECTION PLAN 6.1
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Type II Tree Protection
Type I Tree Protection
Type III Tree Protection
Tree Protection Zone (TPZ) shown in gray (radius of TPZ equals 10-times the diameter of the tree or 10-feet, whichever is greater). Restricted activity area -- see Tree Technical Manual Sec 2.15(E). Restricted trenching area -- see Tree Technical Manual Sec 2.20(C-D), any proposed trench or form work within TPZ of a protected tree requires approval from Public Works Operations. Call 650-496-5953.
TPZeither 10 x Tree Diameter or 10-feet,
whichever is greater
Any proposed trenchin TPZ requires approval
See TTM 2.20 C-Dfor instructions
6-foot highchain link fence,
typical
(to be used only with approval of Public Works Operations)
Tree fencing is required and shall be erected before demolition, grading or construction begins.
Any inadvertant sidewalk or curb replacement or trenching requires approval
Rev By Date
City of Palo Alto Standard DwgNo.
Approved by:
Dave Dockter
Date
PE No.
2006
Scale: NTS 605
Tree ProtectionDuring Construction
2-inches of Orange Plastic Fencingoverlaid with
2-inch Thick Wooden Slats
Detailed specifications are found in the Palo Alto Tree Technical Manual (TTM) (www.cityofpaloalto.org/trees/)
Warning
Warning
Warning
8.5x11-inch Warning Signs one each side
Fencing must provide public passage while protecting all other land in TPZ.
For written specifications associated with illustrations below, see Public Works Specifications Section 31
Fence distance
to outer branches or TPZ
12/14/92
Restricted use fortrees in sidewalk cutout
tree wells only
For all Ordinance Protected and Designated trees, as detailed in the site specific
tree preservation report (TPR) prepared by the applicant’s project arborist as diagramed on the plans.
Yard
Sidewalk
Parkway Strip
Street
D.D.01 08/04/04
02 D.D. 08/10/06
0 DWH
Warning
SPECIAL INSPECTIONS PLANNING DEPARTMENT
TREE PROTECTION INSPECTIONS MANDATORY PAMC 8.10 PROTECTED TREES. CONTRACTOR SHALL ENSURE PROJECT SITE ARBORIST IS PERFORMING REQUIRED TREE INSPECTION AND SITE MONITORING. PROVIDE WRITTEN MONTHLY TREE ACTIVITY REPORTS TO THE PLANNING DEPARTMENT LANDSCAPE REVIEW STAFF BEGINNING 14 DAYS AFTER BUILDING PERMIT ISSUANCE.
BUILDING PERMIT DATE: ______________________ _______ DATE OF 1ST TREE ACTIVITY REPORT: ___ _____________ CITY STAFF: ___________________________ ___________
REPORTING DETAILS OF THE MONTHLY TREE ACTIVITY REPORT SHALL CONFORM TO SHEET T-1 FORMAT, VERIFY THAT ALL TREE PROTECTION MEASURES ARE IMPLIMENTED AND WILL INCLUDE ALL CONTRACTOR ACTIVITY, SCHEDULED OR UNSCHEDULED, WITHIN A TREE PROTECTION ROOT ZONE. NON-COMPLIANCE IS SUBJECT TO VIOLATION OF PAMC 8.10.080. REFERENCE: PALO ALTO TREE TECHNICAL MANUAL, SECTION 2.00 AND ADDENDUM 11.
http://www.cityofpaloalto.org/civica/filebank/blobdload.asp?BlobID=6460
2775 EMBARCADERO WAY
THERE ARE NO TREES WITHIN THE PROJECT LIMITS
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http://www.cityofpaloalto.org/civica/filebank/blobdload.asp?BlobID=6460
Apply Tree Protection Report on sheet(s) T-2Use addtional “T” sheets as needed
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