HomeMy WebLinkAboutTrans 2014-11-24 Item 2A - Update - 42nd Avenue South / Allentown Roadside BarrierCity of Tukwila
Jim Haggerton, Mayor
INFORMATIONAL MEMORANDUM
TO: Mayor Haggerton
Transportation Committee
FROM: Bob Giberson, Public Works Director D
BY: Dave Sorensen, Project Manager
DATE: November 21, 2014
SUBJECT: 42nd Ave South /Allentown Roadside Barrier
Project No. 91310301
Project Update
ISSUE
Present an update for the 429d Ave South /Allentown Roadside Barrier Project.
BACKGROUND
A project to study guardrail and /or barrier warrants along the Duwamish River adjacent to 429d Ave South and
S 115th St in Allentown was funded as part of the Small Roadway & Safety Improvements in the Capital
Improvement Program (CIP). The technical analysis is complete and the design phase is underway with the project
plans at approximately 30% complete. Please refer to the attached Project Status Report.
ANALYSIS
The goal of the study is to evaluate applicable design and safety standards, to identify recommended locations to
install new roadside barriers, and to identify any upgrades /modifications to existing guardrail and concrete barriers.
Based on Washington State Department of Transportation (WSDOT) and American Association of State Highway
and Transportation Officials (AASHTO) standards, several areas of the river bank along 420d Ave S and S 115th St
are being recommended for guardrail and /or barrier installation. Construction will include the highest risk and
highest priority areas along the Duwamish River. A safety grant was submitted to WSDOT for construction funding
and grant awards are expected to be announced in mid - December 2014. The safety grant has requested funding
that would allow the City to install all recommended guardrails and /or barriers. If the City is not awarded the grant
funds, City funds will be used to construct the guardrail and barrier in phases over multiple years (subject to CIP
funding).
FISCAL IMPACT
The estimated construction costs for all recommended guardrail and barrier installations is $299,970 based on the
calculations of the current 30% design. This includes a 10% contingency and with construction management at
15 %, the total project cost estimate is $344,465. Without grant funding, the 2015 construction budget is $70,000.
Additional City funds will be needed for the Small Roadway & Safety Improvements Program if the grant funds are
not awarded to the City. Construction costs could be spread over the next 6 years to minimize the impact to the
Residential Street Fund (103 Fund).
RECOMMENDATION
For information only.
Attachments: Page 5, Proposed 2015 CIP for Small Roadway & Safety Improvements
Consultant Project Status Report with Vicinity Map and Aerial Layout
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W: \PW Eng \ PROJECTS \A- RW & RS Projects \42nd Ave S Allentown Roadside Barrier (91310301) \Design \November 24th TC Project Update \Info Memo 42nd Ave S Barrier draft report - sb.docx
CITY OF TUKWILA CAPITAL PROJECT SUMMARY
2015 to 2020
PROJECT: Small Roadway and Safety Improvements Project No. 91310301
Varies
DESCRIPTION: Programmatic approach to addressing small roadway and safety concerns through a variety of methods.
Addresses needs not included in general maintenance, traffic calming, or other approaches.
JUSTIFICATION: Increasing public demand on staff time. Local access streets in residential neighborhoods may need minor
roadway or safety improvements that can not be addressed with any other City program.
STATUS: 42nd Ave S /Allentown Roadside Barrier is proposed in phases, Project No. 91310301. Full design in 2014
and critical areas constructed in 2015. Additional construction in 2016 is grant dependent.
MAINT. IMPACT: Minimal.
COMMENT: Federal construction grant is proposed for $350,000 from the City Safety with no local match required. Full
program is only feasible if Public Works adds a Traffic Engineer to staff (same position as Traffic Calming).
FINANCIAL Through Estimated
in $000's
2013 2014 2015
2016 2017 2018 2019 2020 BEYOND TOTAL
EXPENSES
Design
8
88
20
116
Land (R/W)
0
Const. Mgmt.
10
50
60
Construction
60
300
360
TOTAL EXPENSES
8
88
90
350
0
0
0
0
0
536
FUND SOURCES
Awarded Grant
0
Proposed Grant
350
350
Mitigation Actual
0
Mitigation Expected
0
City Oper. Revenue
8
88
90
0
0
0
0
0
0
186
TOTAL SOURCES
8
88
90
350
0
0
0
0
0
536
2015 - 2020 Capital Improvement Program
5
2
Project Status Report
To: Dave Sorensen, P.E. — City of Tukwila
From: Nelson Davis - KPG
Date: 11/13/2014
Re: 42nd Ave S — Roadside Barrier Warrant Analysis
Project No: City # 91310301.1000.100 (KPG # 13093)
BACKGROUND:
The City of Tukwila intends to install roadside barrier along 42nd Avenue S and S 115th
Street in general accordance with the recommendations contained in the `42nd Avenue S —
Roadside Barrier Analysis' prepared by KPG (9/25/2013). The proposed improvements
include installation /replacement of approximately 2,400 linear feet of barrier along the west
side of 42nd Avenue S / south side of S 115th Street. The roadway is located adjacent to
the Duwamish River and the barrier will improve safety along this stretch of the roadway.
CURRENT PROJECT STATUS:
KPG has completed utility locates, survey, geotechnical review and prepared 30% Plans
and Construction Cost Estimate that is currently under review with the City. The Plans
generally match the recommendations included in the original Roadside Barrier Analysis
that combines the use of of anchored concrete barrier and WSDOT standard galvanized
beam guardrail on timber posts. In some locations, beam guardrail was recommended in
the original Barrier Analysis, but has been upgraded to anchored concrete barrier in the
current 30% design due to discovery of underground utilities. The underground utilities
would conflict with timber post installation and result in greater costs associated with utility
relocation and pavement repair compared with changing the type of barrier.
ESTIMATED COSTS AND ALTERNATIVES CONSIDERED:
The estimated construction cost at the 30% design level is $300,000 compared with a
preliminary estimate of $275,000 during the 2013 Barrier Analysis. The increased cost is
primarily due to the need for additional anchored concrete barrier in lieu of beam guardrail
due to underground utility conflicts.
As requested, we also reviewed alternate guardrail materials as follows:
• Use of weathering steel guardrail to replace galvanized beam guardrail would result
in a cost increase of approximately $30,000 over the current estimate.
• Use of steel backed timber guardrail to replace galvanized beam guardrail would
result in a cost increase of approximately $120,000 over the current estimate.
753 9th Avenue North, Seattle, WA 98109 P: 206.286.1640 F: 206.286.1639 www.kpg.com 3
These estimates are for replacement of the beam guardrail portion of the project only,
which is approximately 50% of the proposed barrier. The remaining 50% of barrier would
remain as anchored concrete barrier due to either physical site conditions or conflicts with
subsurface utilities that would result from timber post installation.
SCHEDULE:
A grant application was submitted for construction funding through the Highway Safety
Improvement Program (HSIP) in July, 2014. If the City is awarded grant funds, the intent
would be to construct all of the improvements under a single construction contract in 2015.
If the funding is not approved, the project will be split into phases to be completed over the
next few years in accordance with the current budget. Determination of grant funding is
scheduled for December 2014, at which time we will proceed with final design and
permitting of the improvements. A phasing strategy will be developed in the event that
grant funds are not available.
If grant funds are awarded to the City, additional environmental documentation will be
required to satisfy federal funding requirements; however, the goal is to complete the
permitting and design for construction in the summer /fall of 2015.
P
753 9t" Avenue North, Seattle, WA 98109 P: 206.286.1640 F: 206.286.1639 www.kpg.com 4
Vicinity Map
PROJECT
LOCATION
;c 3
753 9th Avenue North, Seattle, WA 98109 P: 206.286.1640 F: 206.286.1639 www.kpg.com 5
42nd Ave S Roadside Barrier Analysis
30% Design Summary
PROPOSED GUARDRAIL
PROPOSED CONCRETE BARRIER
DOSING CONCRETE BARRIER TO REMAIN
753 9th Ave 01 2502 Jefferson Ave
Seattle, WA 98109 Tacoma, WA 98402
(206) 286 -1640 (253) 627 -0720
www,kpg.com