HomeMy WebLinkAboutTrans 2015-06-15 Item 2A - Update - 42nd Avenue South / Allentown Roadside Barriers StatusTO:
City of Tukwila
Jim Haggerton, Mayor
INFORMATIONAL MEMORANDUM
Mayor Haggerton
Transportation Committee
FROM: Bob Giberson, Public Works Director
BY: Dave Sorensen, Project Manager
DATE: June 12, 2015
SUBJECT: 42nd Ave S /Allentown Roadside Barrier
Project No. 91310301
Project Update
ISSUE
Present an update for the 42nd Ave S /Allentown Roadside Barrier Project.
BACKGROUND
The 42nd Ave S /Allentown Roadside Barrier Project is funded as part of the Small Roadway & Safety Improvements in the
Capital Improvement Program (CIP) and was preceded by a study to determine guardrail and /or barrier warrants along
the Duwamish River adjacent to 42nd Ave S and S 115th St in Allentown. The goal is to prevent accidents, in
accordance with engineering design standards, in which vehicles could possibly enter the river. Several areas of the
river bank are being recommended for additional guardrails and /or barriers.
At the April 6, 2015 Transportation Committee meeting, it was agreed that during the Allentown Community meeting on
May 7, 2015, staff would solicit residents' ideas on the Roadside Barrier Project. While most of the discussion focused on
traffic safety and traffic enforcement concerns, feedback on the barrier project included support for the proposed
installation locations and support for the timber guardrail alternative.
ANALYSIS
Alternative Barrier Options: At the November 25, 2014 Transportation Committee meeting alternatives to using steel
guardrail and concrete barriers were suggested with the idea of softening the visual impacts along the river environment.
A revised plan has been prepared that proposes the use of timber guardrail as an alternative at all new barrier locations
(see attached plan sheet).
Also for consideration is the option to install timber guardrail where current concrete barrier and steel guardrail exist. The
existing steel guardrail could be removed (leaving the posts) and the new timber railing could be installed on the remaining
posts at their current locations. However, the conversion of all barriers to the timber guardrail will increase the total project
costs. Costs would include relocating a communication line and water main and are summarized below.
FISCAL IMPACT
The estimated construction cost for the originally recommended steel W -beam guardrail and concrete barrier installations
was $299,970 based on the calculations of the current 30% design. This includes a 10% contingency and construction
management at 15 %.
Steel W -Beam (includes 10% Contingency) $299,970.00
Construction Management 15% 44,995.50
Estimated Total of Steel W -Beam $344,965.50
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INFORMATIONAL MEMO
Page 2
Added Costs to Use Timber Guardrail
The cost increase to use timber guardrail is estimated to be an additional $170,000 over the current 30% design
estimate. While there is currently no standard design for crashworthy end treatment available, the project specific end
treatment will be included in the design. Additional costs include:
• Timber Guardrail $75k to replace existing steel and concrete barrier
• Waterline relocation $45k
• Telecom relocation (possibly no cost to City based on franchise agreement)
• Embankment stabilization $25 -$50k
The 2015 construction budget is set at $60,000 with an additional $10,000 for construction management. The current
estimate shows that Phase 1 (as shown on the attached plan sheet) can be constructed within the 2015 budget with the
Timber Guardrail. Breaking the project into multiple construction phases will likely increase the overall project costs due
to additional contract management, bidding, and implementation costs. The additional costs will be better quantified after
actual bids are received for the initial phase.
Total for Timber Guardrail including the additional costs listed above.
Timber Guardrail (includes 10% Contingency)
Construction Management 15%
Estimated Total of Timber Guardrail
$470,000.00
70,500.00
$540,500.00
Additional City funds would be needed for the Small Roadway & Safety Improvements Program if any options listed
above are requested by Council. Construction costs could be spread over the next 6 years to minimize the impact to the
Residential Street Fund (103 Fund).
RECOMMENDATION
Staff recommends moving forward with this project and installing Timber Guardrail using the current funding level
programmed in the CIP of $70,000. Future Council approval will be needed for any additional funding to the 42nd Ave
S /Allentown Roadside Barrier Project. The alternative recommendation would be to install standard steel W -Beam
guardrail and concrete barrier if additional funding will not be approved in the future.
Attachments: Page 5, 2015 CIP for Small Roadway & Safety Improvements
Aerial Layout with Phase I identified
W:1PW Eng1PROJECTSIA- RW & RS Projects142nd Ave S Allentown Roadside Berner (91310301)1Design\TC Project UpdatelMay TC Update May 2015 Info Memo 42nd Ave S Barrier gl -rrt Final.docx
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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
a
Design
8
30
78
116
Land(RIW)
0
Const. Mgmt.
10
50
60
Construction
60
300
360
TOTAL EXPENSES
8
30
148
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
30
148
0
0
0 0
0
0
186
TOTAL SOURCES
8
30
148
350
0
0 iI 0
0
0
536
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42nd Ave S Roadside Barrier Anal
TIMBER GUARDRAIL OPTION
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