2025 ADA Barriers - Final Plans.pdf

PDF 43 MB Posted May 6, 2025

Attached to: 2025 ADA Barrier Removals State and local contract opportunity
Solicitation number: ITB-0000000003
Issued by: King County, Washington

About this file

Written by GovTribe AI · May 7, 2025

This document is a comprehensive set of construction plans for the 2025 ADA Barrier Removal Project by the City of Sammamish's Department of Public Works in Washington State. The project involves removing and replacing damaged sidewalk panels, mitigating tree root intrusions, and upgrading non-compliant curb ramps at two primary locations: Site A (228th Avenue NE/SE) and Site B (SE Klahanie Boulevard and 256th Avenue SE). The project includes specific site-specific work for 16 individual locations, with detailed plans for sidewalk panel removal, tree root management, catch basin insertions, and installation of new ADA-compliant infrastructure. Construction notes emphasize field verification of existing conditions, ADA compliance, and careful management of tree roots and existing improvements.

The project requires contractors to provide all labor, equipment, materials, and supervision necessary to complete the infrastructure upgrades. The plans specify technical requirements such as sawcutting, concrete placement, tree root pruning, steel plate installation, and detectable warning surface implementation. Contractors will need to follow precise construction sequencing to maintain pedestrian access and ensure continuous walkways. The project documents include detailed site maps, work explanations for each location, and standard construction notes that provide guidance on technical specifications and site preparation. No specific budget or funding sources are directly outlined in the provided documentation.

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Other files for this state and local contract opportunity

Other files attached to 2025 ADA Barrier Removals, newest first.
File	Type	Posted
2025 ADA Barriers - Final Specs Part 1-3 (Proposal).pdf	PDF	May 6, 2025
2025 ADA Barriers - Final Specs Part 4 (Special Provisions).pdf	PDF	May 6, 2025

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SITE A

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SITE B

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APPROVED FOR CONSTRUCTION

AUDRIE STARSY DATE

PUBLIC WORKS DIRECTOR

LEI WU, P.E. DATE

CITY ENGINEER

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SHEET INDEX

1..............VICINITY MAP

2..............WORK PLAN - SITE A.1

3..............WORK PLAN - SITE A.2

4-7...........SITE-SPECIFIC WORK - SITE A.1

8-9...........SITE-SPECIFIC WORK - SITE A.2

10............WORK PLAN - SITE B.1

11-12.......SITE SPECIFIC WORK - SITE B.1

13............WORK PLAN - SITE B.2

14-15.......SITE SPECIFIC WORK - SITE B.2

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CITY OF SAMMAMISH

MAYOR

KAREN HOWE

DEPUTY MAYOR

AMY LAM

CITY COUNCIL

KALI CLARK

ROISIN O'FARRELL

SID GUPTA

PAM STUART

KENT TREEN

CITY MANAGER

SCOTT MACCOLL

PUBLIC WORKS DIRECTOR

AUDRIE STARSY

CITY ENGINEER

LEI WU

PROJECT MANAGER

JOE DAPCEVICH

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GENERAL NOTES

The location of the features shown on these plans is approximate and not based on topographical survey. Contractor shall field-verify existing conditions prior to bidding and will incorporate field conditions as all-inclusive in their bid.

Contractor shall identify and mark in the field all reconstruction limits for contracting agency approval five working days in advance of sawcutting and/or excavation.

All features shall be ADA-compliant.

Contract Shall protect existing improvements located outside of project limits. Contractor shall replace damaged improvement at no cost to the agency.

Dimensions and grades shown on the plans are provided to convey intent of the proposed improvements. Grades may be adjusted in the field as directed by the engineer at no additional cost to the Owner.

SIDEWALK CONSTRUCTION NOTES

Install catch basin insert per WSDOT STD Plan I-40.20.

Install temporary tree protection fencing around adjacent trees, per SP 9-14.9 (Tree Root Management).

Demolish and remove existing cement concrete sidewalk panels. Sawcutting may be required.

Prune, shave, and/or install steel plates above tree roots, per Figures 2.3 - 2.6 (Site-Specific Work). If roots are to be exposed more than 24 hours, cover with wet burlap.

Adjust utility lid to grade, if necessary.

Place and compact CSTC to prepare sidewalk grade.

When feasible, place additional clean (poorly-graded) gravel on top of roots to slightly raise final sidewalk grade, per SP 9-14.9.

Form and pour new cement concrete sidewalk panels to match existing, per COS Standard Detail 3-8A.

*Perform step only at specified sites*

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GENERAL NOTES

Contractor shall identify and mark in the field all reconstruction limits for contracting agency approval five working days in advance of sawcutting and/or excavation.

All features shall be ADA-compliant.

Contract Shall protect existing improvements located outside of project limits. Contractor shall replace damaged improvement at no cost to the agency.

SIDEWALK CONSTRUCTION NOTES

Install temporary tree protection fencing around adjacent trees, per SP 9-14.9 (Tree Root Management).

Demolish and remove existing cement concrete sidewalk panels. Sawcutting may be required.

Prune, shave, and/or install steel plates above tree roots, per Figures 2.7 - 2.8 (Site-Specific Work). If roots are to be exposed more than 24 hours, cover with wet burlap.

Place and compact CSTC to prepare sidewalk grade, as needed. When feasible, place additional clean (poorly-graded) aggregate on top of roots to slightly raise final sidewalk grade, per SP 9-14.9.

Form and pour new cement concrete sidewalk panels to match existing, per COS Standard Detail 3-8A.

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2025 ADA Barrier Removal Project

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A-1

Location 228th Ave SE, West Side South of McDonald's

Work Explanation

• Install tree protection fencing

• Remove 3 sidewalk panels: 5'x7', 5'x6', 7'x7'

• Prune roots < 1" diameter

• Shave roots > 1" diameter flush with subgrade

• Bolt steel plates above shaved roots

• Place clean aggregate on top of tree roots

• Place CSTC to prepare sidewalk grade

• Form & pour new concrete sidewalk panels

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A-2

Location 228th Ave SE, West Side South of McDonald's

Work Explanation

• Install catch basin insert (1)

• Install tree protection fencing

• Remove 2 sidewalk panels: 5'x6', 8'x12'

• Shave tree roots > 1" diameter flush with subgrade

• Install steel plates over tree roots

• Adjust catch basin lid (2), if necessary

• Place clean aggregate on top of tree roots

• Place CSTC to prepare sidewalk grade

• Form & pour new concrete sidewalk panels

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A-3

Location 228th Ave SE, West Side South of McDonald's

Work Explanation

• Install tree protection fencing

• Remove 2 sidewalk panels: 5'x6', 15'x8'

• Shave tree roots > 1" diameter flush with subgrade

• Install steel plates over tree roots

• Place clean aggregate on top of tree roots

• Place CSTC to prepare sidewalk grade

• Form & pour new concrete sidewalk panels

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SIDEWALK CONSTRUCTION NOTES

Conditions shown were documented in September 2024. The engineer may adjust replacement limits during construction due to changed conditions.

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2025 ADA Barrier Removal Project

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A-4

Location 228th Ave SE, West Side South of McDonald's

Work Explanation

• Remove 3 sidewalk panels: 8'x8', 5'x6', 8'x8'

• Shave tree roots > 1" diameter flush with subgrade

• Install steel plates over tree roots

• Place clean aggregate on top of tree roots

• Place CSTC to prepare sidewalk grade

• Form & pour new concrete sidewalk panels

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A-5

Location 228th Ave SE, West Side, South of McDonald's

Work Explanation

• Remove 3 sidewalk panels: 8'x8', 5'x6', 8'x5'

• Shave tree roots > 1" diameter flush with subgrade

• Install steel plates over tree roots

• Place clean aggregate on top of tree roots

• Place CSTC to prepare sidewalk grade

• Form & pour new concrete sidewalk panels

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A-6

Location 228th Ave SE, West Side South of McDonald's

Work Explanation

• Install catch basin insert

• Remove 2 sidewalk panels: 4'x8', 5'x6'

• Shave tree roots > 1" diameter flush with subgrade

• Install steel plates over tree roots

• Place clean aggregate on top of tree roots

• Place CSTC to prepare sidewalk grade

• Form & pour new concrete sidewalk panels

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SIDEWALK CONSTRUCTION NOTES

Conditions shown were documented in September 2024. The engineer may adjust replacement limits during construction due to changed conditions.

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A-7

Location 228th Ave SE, East Side North of NE 4th St

Work Explanation

• Remove 1 sidewalk panel: 16'x15'

• Prune roots < 1" diameter, as necessary

• Place CSTC to prepare sidewalk grade

• Form & pour new concrete sidewalk panels

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A-8

Location 228th Ave SE, East Side South of Taco Time

Work Explanation

• Remove 2 sidewalk panels: 16'x12', 6'x12'

• Prune or shave if roots are present

• Place CSTC to prepare sidewalk grade

• Form & pour new concrete sidewalk panels

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Location 228th Ave SE, East Side North of Taco Time

Work Explanation

• Remove 1 sidewalk panel: 6'x12'

• Prune or shave if roots are present

• Install steel plates over tree roots, if necessary

• Remove shrub at base

• Place CSTC to prepare sidewalk grade

• Form & pour new concrete sidewalk panels

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SIDEWALK CONSTRUCTION NOTES

Conditions shown were documented in September 2024. The engineer may adjust replacement limits during construction due to changed conditions.

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A-10

Location 228th Ave SE, East Side North of Bank of America

Work Explanation

• Remove 2 sidewalk panels: 16'x10', 6'x12'

• Shave tree roots > 1" diameter flush with subgrade

• Install steel plates over tree roots

• Remove shrub at base

• Place clean aggregate on top of tree roots

• Place CSTC to prepare sidewalk grade

• Form & pour new concrete sidewalk panels

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A-11

Location 228th Ave SE, East Side North of Bank of America

Work Explanation

• Install catch basin insert.

• Remove 4 sidewalk panels:16'x10', 10'x12', 4'x16', 6'x12'

• Adjust valve box (if necessary)

• Shave tree roots > 1" diameter flush with subgrade

• Install steel plates over tree roots

• Place clean aggregate on top of tree roots

• Place CSTC to prepare sidewalk grade

• Form & pour new concrete sidewalk panels

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SIDEWALK CONSTRUCTION NOTES

Conditions shown were documented in September 2024. The engineer may adjust replacement limits during construction due to changed conditions.

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A-12

Location 228th Ave SE, West Side South of Market Driveway

Work Explanation

• Remove 1 sidewalk panel: 6'x10'

• Shave tree roots > 1" diameter flush with subgrade

• Install steel plates over tree roots

• Place CSTC to prepare sidewalk grade

• Form & pour new concrete sidewalk panels

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SIDEWALK CONSTRUCTION NOTES

Conditions shown were documented in September 2024. The engineer may adjust replacement limits during construction due to changed conditions.

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A-14

Location 228th Ave SE, East Side 100' North of Crusader Way

Work Explanation

• Remove 1 sidewalk panel: 12'x15'

• Place CSTC to prepare sidewalk grade

• Form & pour new concrete sidewalk panels

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Location 228th Ave SE, West Side West of SE 5th Ct

Work Explanation

• Remove 2 sidewalk panels: 6'x5', 6'x5'

• Shave tree roots > 1" diameter flush with subgrade

• Install steel plates over tree roots

• Place clean aggregate on top of tree roots

• Place CSTC to prepare sidewalk grade

• Form & pour new concrete sidewalk panels

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Location 228th Ave SE, East Side 200' North of Crusader Way

Work Explanation

• Remove 1 sidewalk panel: 12'x15'

• Shave tree roots > 1" diameter flush with subgrade

• Install steel plates over tree roots

• Place clean aggregate on top of tree roots

• Place CSTC to prepare sidewalk grade

• Form & pour new concrete sidewalk panels

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SIDEWALK CONSTRUCTION NOTES

Conditions shown were documented in September 2024. The engineer may adjust replacement limits during construction due to changed conditions.

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A-16

Location 228th Ave SE, East Side 50' South of Driveway

Work Explanation

• Remove 1 sidewalk panel: 6'x15'

• Shave tree roots > 1" diameter flush with subgrade

• Install steel plates over tree roots

• Place clean aggregate on top of tree roots

• Place CSTC to prepare sidewalk grade

• Form & pour new concrete sidewalk panels

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GENERAL NOTES

Contractor shall identify and mark in the field all reconstruction limits for contracting agency approval five working days in advance of sawcutting and/or excavation.

All features shall be ADA-compliant.

Contractor shall protect existing improvements located outside of project limits. Contractor shall replace damaged improvement at no cost to the agency.

CONSTRUCTION SEQUENCING NOTES

Existing curb ramps and sidewalk panels must be removed in a sequence that allows for a continuous walk path and safe pedestrian access through each corner of intersection.

CURB RAMP CONSTRUCTION NOTES

Install catch basin insert per WSDOT STD Plan I-40.20.

Sawcut and remove existing cement concrete sidewalk, curb, and gutter. If edge of asphalt around curb is damaged, a 2-foot-wide sawcut is required.

Place CSTC to prepare sidewalk grade.

Form and pour new cement concrete parallel/perpendicular curb ramp per COS Standard Detail 2-07 and plan. Engineer will locate new center of ramp.

Install new detectable warning surface(s) per WSDOT Standard Detail F-45.10.

Form and pour new cement concrete sidewalk, pedestrian curb, curb, and gutter to match existing, per COS Standard Detail 3-8A. Replace asphalt to match, if necessary.

Repaint existing thermoplastic stop bar and crosswalk striping at all four crossings, per COS Standard Detail 4-05.

Provide surveyed as-builts and measurements of each ADA feature as indicated on the ADA Inspection Form(s).

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B-2

Location SE Klahanie Blvd & 256th Avenue SE South Corner

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• Install catch basin insert

• Remove existing curb ramp and sidewalk sections (6' x 40')

• Place CSTC to prepare sidewalk grade

• Install new parallel ADA curb ramp & detectable warning surface

• Place new concrete sidewalk panels, curb, pedestrian curb, & gutter

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B-1

Location SE Klahanie Blvd & 256th Avenue SE West Corner

JDapcevich Text Box Work Explanation

• Install catch basin insert

• Remove existing curb ramp and sidewalk sections (7' x 35')

• Place CSTC to prepare sidewalk grade

• Install new parallel ADA curb ramp & detectable warning surface

• Place new concrete sidewalk panels, curb, pedestrian curb, & gutter

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JDapcevich Text Box Site-Specific Work - Site B.1 SE Klahanie Blvd & 256th Ave SE

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SIDEWALK CONSTRUCTION NOTES

Conditions shown were documented in September 2024. The engineer may adjust replacement limits during construction due to changed conditions.

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JDapcevich Text Box Site No.

B-3

Location SE Klahanie Blvd & 256th Avenue SE East Corner

Work Explanation

• Remove existing curb ramp and sidewalk sections (9' x 35')

• Place CSTC to prepare sidewalk grade

• Install new perpendicular ADA curb ramp & detectable warning surface

• Place new concrete sidewalk panels, curb, & gutter

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JDapcevich Text Box 2025 ADA Barrier Removal Project

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JDapcevich Text Box Site-Specific Work - Site B.1 SE Klahanie Blvd & 256th Ave SE

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JDapcevich Text Box Approximate Sidewalk Replacement Limits

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SIDEWALK CONSTRUCTION NOTES

Conditions shown were documented in September 2024. The engineer may adjust replacement limits during construction due to changed conditions.

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GENERAL NOTES

Contractor shall identify and mark in the field all reconstruction limits for contracting agency approval five working days in advance of sawcutting and/or excavation.

All features shall be ADA-compliant.

Contractor shall protect existing improvements located outside of project limits. Contractor shall replace damaged improvement at no cost to the agency.

CONSTRUCTION SEQUENCING NOTES

Existing curb ramps and sidewalk panels must be removed in a sequence that allows for a continuous walk path, and safe pedestrian access through each corner of intersection.

CURB RAMP CONSTRUCTION NOTES

Install catch basin insert per WSDOT STD Plan I-40.20.

Sawcut and remove existing cement concrete sidewalk, curb, and gutter. If edge of asphalt around curb is damaged, a 2-foot-wide sawcut is required.

Place CSTC to prepare sidewalk grade.

Form and pour new cement concrete parallel curb ramp per COS Standard Detail 2-07 and plan. Engineer will locate new center of ramp.

Install new detectable warning surface(s) per WSDOT Standard Detail F-45.10.

Form and pour new cement concrete sidewalk, curb, pedestrian curb, and gutter to match existing, per COS Standard Detail 3-8A. Replace asphalt to match, if necessary.

Remove existing stop bar and install new thermoplastic stop bar per COS Standard Detail 4-05.

Install new crosswalk striping per COS Standard Detail 4-05.

Provide surveyed as-builts and measurements of each ADA feature as indicated on the ADA Inspection Form(s).

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JDapcevich Text Box SE 39th Way

JDapcevich Text Box Klahanie Dr SE

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JDapcevich Text Box 2025 ADA Barrier Removal Project

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JDapcevich Text Box Work Plan - Site B.2 Klahanie Dr SE & SE 39th Way

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JDapcevich Text Box Site No.

B-4

Location SE Klahanie Blvd & SE 39th Way Northwest Corner

JDapcevich Text Box Work Explanation

• Install catch basin insert

• Remove existing curb ramp and sidewalk sections (7' x 15')

• Place CSTC to prepare sidewalk grade

• Install new parallel ADA curb ramp & detectable warning surface

• Place new concrete sidewalk panels, curb, pedestrian curb, & gutter

• Install new crosswalk lines

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JDapcevich Text Box Site No.

B-5

Location SE Klahanie Blvd & SE 39th Way Northeast Corner

JDapcevich Text Box Work Explanation

• Install catch basin insert

• Remove existing curb ramp and sidewalk sections (5' x 20')

• Place CSTC to prepare sidewalk grade

• Install new parallel ADA curb ramp & detectable warning surface

• Place new concrete sidewalk panels, curb, pedestrian curb, & gutter

• Remove existing stop bar

• Install new stop bar

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JDapcevich Text Box 2025 ADA Barrier Removal Project

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JDapcevich Text Box Site-Specific Work - Site B.2 Klahanie Dr SE & SE 39th Way

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SIDEWALK CONSTRUCTION NOTES

Conditions shown were documented in September 2024. The engineer may adjust replacement limits during construction due to changed conditions.

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JDapcevich Text Box Approximate Sidewalk Replacement Limits

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B-6

Location SE Klahanie Blvd & SE 39th Way Southwest Corner

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• Install catch basin insert

• Remove existing curb ramp and sidewalk sections (6' x 25')

• Place CSTC to prepare sidewalk grade

• Install new parallel ADA curb ramp & detectable warning surface

• Place new concrete sidewalk panels, curb, pedestrian curb, & gutter

• Remove existing stop bar

• Install new stop bar

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JDapcevich Text Box Site-Specific Work - Site B.2 Klahanie Dr SE & SE 39th Way

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JDapcevich Text Box Approximate Sidewalk Replacement Limits

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SIDEWALK CONSTRUCTION NOTES

Conditions shown were documented in September 2024. The engineer may adjust replacement limits during construction due to changed conditions.

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B-7

Location SE Klahanie Blvd & SE 39th Way Southeast Corner

JDapcevich Text Box Work Explanation

• Install catch basin insert

• Remove existing curb ramp and sidewalk sections (5' x 20')

• Place CSTC to prepare sidewalk grade

• Install new parallel ADA curb ramp & detectable warning surface

• Place new concrete sidewalk panels, curb, pedestrian curb, & gutter

• Install new crosswalk lines

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File details come from the government source that posted it. Updated May 7, 2025.