HomeMy WebLinkAbout07/25/2006 Blue Sheet Silverbell Road Construction Traffic Mitigation Study
TOWN COUNCIL
MEETING
INFORMATION
TOWN OF MARANA
MEETING DATE: July 25, 2006
AGENDA ITEM:
D.I
TO: MAYOR AND COUNCIL
FROM: Kevin T. Thornton, P.E., Assistant Director of Public Works
SUBJECT: Presentation: Silverbell Road Construction Traffic Mitigation
Study
DISCUSSION
Kevin Thornton, Assistant Director of Public Works, Fernando Prol, Traffic Engineering
Division Manager, and Alejandro Angel, P.E., Traffic Engineering Manager for MMLA-Psomas
will make a presentation of the Silverbell Road Construction Traffic Mitigation Study.
This presentation will provide an overview of the Silverbell Road construction project, including
the schedule, construction impacts, and phasing of the project. MMLA-Psomas has developed a
computer simulation that replicates traffic patterns during construction at the intersections of
Silverbell Road/Cortaro Road, Silverbell Road/Ina Road, and elsewhere in the affected area.
A proposed closure of Silver bell Road (from Ina Road to Bradstreet Drive) will allow the project
to reduce construction time by approximately three months and save an estimated $600,000 to
$750,000 from the construction budget.
The closure of Silverbell Road will allow the following items to be completed much quicker than
a typical construction project:
· Sanitary Sewer - The sewer is located immediately to the south and east of the proposed
alignment at a depth ranging from 15' to 20'. By allowing the closure, the construction
of the sanitary sewer will be completed quicker and at a lower cost than if traffic is
allowed to remain on Silverbell Road. It is estimated that the sewer could be constructed
at a savings of approximately $50,000.
· Box Culverts - There are seven large box culverts varying in size from a 3 barrell0'x4'
box to a 7 barrell0'x4' box. Five of the culverts will be located in the proposed closure.
These will be constructed as precast units and will be able to be excavated and installed at
one time rather than half at a time as is typical when accommodating existing traffic.
Approximately $350,000 could be saved by allowing the closure.
· Traffic Control - By allowing a quicker construction timeframe, traffic control costs will
be greatly reduced. These costs can run approximately 8% of the total construction cost.
It is estimated that up to $250,000 could be saved on traffic control alone.
Silverbel/ Road
2/24/2004 1:33 PM FJC
An expedited construction project that restricts vehicular access will improve citizen (motorist)
safety, safety of the construction team, reduce complaints about construction impacts to
motorists, and shorten the project. However, road closures do complicate travel patterns and
may create some citizen complaints about diverted traffic on the surrounding roadways.
ATTACHMENTS
Silverbell Road Construction Traffic Mitigation Study presentation.
RECOMMENDATION
Staff recommends Council consideration to restrict vehicular access from Ina Road to Bradstreet
Drive (the road closure will occur south of all residential entrances) during the construction
phase.
SUGGESTED MOTION
Council's pleasure.
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