Southwest Arterial_Value Engineering Study Update_Interchange ConceptsMasterpiece on the Mississippi
TO: The Honorable Mayor and City Council Members
FROM: Michael C. Van Milligen, City Manager
SUBJECT: Southwest Arterial - Value Engineering Study Update
SW Arterial / U.S. 20 / Seippel Road Interchange Configuration
DATE: November 12, 2010
Dubuque
All-America City
1 1 - 1
2007
Assistant City Engineer Bob Schiesl is providing an informational update on the
Southwest Arterial project. Bob will be making a presentation. There are no decisions
to be made tonight.
As part of the final design phase of the Southwest Arterial, the Iowa Department of
Transportation (Iowa DOT) and the Federal Highway Administration (FHWA) required
that a formal Value Engineering (VE) Study be conducted. The primary objective of the
Study was to identify potential modifications that might decrease the construction cost
and /or to increase the value of the project, without changing the functional aspects of
the roadway.
In December 2009, the final Value Engineering Report was completed and several
organizations and agencies have been examining the feasibility and practicality of the
value engineering concepts.
The preliminary re- design efforts have been quite extensive and have required the
design team to: evaluate new interchange layouts; perform detailed traffic analysis;
develop new roundabout intersection details; investigate design variations for the
bridges; coordinate reviews with Iowa DOT staff; evaluate potential impacts to right -of-
way acquisition; evaluate potential impacts to wetlands, historic and cultural resource
areas; environmental clearance compliance; and review watershed and stream crossing
impacts.
The potential savings to the project are approximately $7.5 million and actually provide
a better result.
A public informational meeting will be held later this year.
MCVM:jh
Attachment
cc: Barry Lindahl, City Attorney
Cindy Steinhauser, Assistant City Manager
Gus Psihoyos, City Engineer
Bob Schiesl, Assistant City Engineer
Michael C. Van Milligen
Masterpiece on the Mississippi
TO: Michael C. Van Milligen, City Manager
Gus Psihoyos, City Engineer
FROM: Robert Schiesl, Assistant City Engineer
DATE: November 12, 2010
SUBJECT: Southwest Arterial - Value Engineering Study Update
SW Arterial / U.S. 20 / Seippel Road Interchange Configuration
INTRODUCTION
This memorandum is to provide an update on the results and recommendations of the
preliminary design Value Engineering evaluation for the Southwest Arterial project.
BACKGROUND
Dubuque
klatbal
All-America City
1
2007
As part of the final design phase of the Southwest Arterial, the Iowa Department of
Transportation (Iowa DOT) and the Federal Highway Administration (FHWA) required
that a formal Value Engineering (VE) Study be conducted. The primary objective of the
Study was to identify potential modifications that might decrease the construction cost
or to increase the value of the project, without changing the functional aspects of the
roadway.
VALUE ENGINEERING STUDY
In December, 2009, the Final Value Engineering Report was completed. A team of
senior transportation and bridge engineers from the Federal Highway Administration,
the .City of Dubuque, and AECOM (consultant) and WHKS & Co. (consultant)
investigated 10 initial VE concepts. The VE concepts that were recommended for
further consideration included the following:
VE Concepts Recommended For Further Consideration:
1. Implement sustainable project components (added value, but no cost
reductions).
2. Use roundabouts at North Cascade / English Mill interchange and eliminate loop
ramp ($240,000 savings).
3. Use roundabouts at U.S. 151/61 interchange and eliminate one lane from the
bridge between the ramps ($835,000 savings).
4. Modify U.S. 20 / Seippel Road interchange area, including usage of roundabouts,
changes to the ramp layouts and several changes to the access road layouts
($4,725,000 savings).
5. Modify and standardize bridge structure configurations ($1,400,000 or more in
savings).
6. Modify roadway profiles to reduce earthwork ($300,000 savings).
7. Build entire 4 lanes in first phase, if funding permits (no cost reduction).
Potential total estimated VE savings: $7,500,000
VE Concepts Not Recommended:
1. Eliminate or shift the location of the North Cascade Road interchange ($5 - 7
million in possible savings), however at -grade connections will not be allowed on
Priority 1 freeway corridors.
2. Build an underpass instead of an access road at Knepper Lane (no cost
reduction).
3. Build a tunnel to replace the bridge and retaining wall at Military Road (no cost
information available, although tunnel would be cost prohibitive).
PRELIMINARY DESIGN
Since the VE concepts recommended for further consideration could require significant
plan changes, this required the design team to take a step back in the design process
and re- initiate the preliminary design phase to evaluate and further refine the VE
concepts.
The preliminary re- design efforts have been quite extensive and have required the
design team to: evaluate new interchange layouts; perform detailed traffic analysis;
develop new roundabout intersection details; investigate design variations for the
bridges; coordinate reviews with Iowa DOT staff; evaluate potential impacts to right -of-
way acquisition; evaluate potential impacts to wetlands, historic and cultural resource
areas; environmental clearance compliance; and review watershed and stream crossing
impacts.
The following is a summary of the preliminary design evaluation for those VE
alternatives that either decrease the construction cost or increase the value of the
project.
VE Alternative Evaluated
Implement sustainable project components
Incorporate roundabouts at U.S. 151/61 Interchange
U.S. 151/61 Interchange: eliminate one lane on bridge
Incorporate roundabouts at N. Cascade / English Mill
Road Interchange
North Cascade Interchange: eliminate loop ramp
Modify U.S. 20 / Seippel Road interchange area, including
usage of roundabouts, changes to the ramp layouts
Modify and standardize bridge structure configurations
Modify roadway profiles to reduce earthwork
Build entire 4 lane freeway in first phase
Preliminary Design
Recommendation
Yes, Incorporate
Yes, Incorporate
Yes, Incorporate
Yes, Incorporate
Yes, Incorporate
Yes, Incorporate
in Final Design
in Final Design
in Final Design
in Final Design
in Final Design
in Final Design
Yes, Incorporate in Final Design
Yes, Incorporate in Final Design
No, Funding Limitations
The full extent of the potential VE savings will be evaluated and further refined as the
project team proceeds into the final design phases.
SW ARTERIAL / U.S. 20 / SEIPPEL ROAD INTERCHANGE CONFIGURATION
Based on the findings of the preliminary design evaluation, the most significant VE
recommendations are the proposed modifications to the SW Arterial / U.S. 20 / Seippel
Road interchange area. These changes include: use of roundabouts, changes to the
ramp layouts, changes to the access road layouts, eliminate the need for a cross -over
bridge, and possibly eliminate the need to purchase three (3) properties along Cousins
Road. The potential VE savings to incorporate these savings are in the magnitude of
$6.2 million.
As part of the preliminary design review, several U.S. 20 / Seippel Road interchange
configurations were evaluated and are shown on the attached Concept A, B and C.
Concept A - Evaluated a folded diamond interchange configuration with loop ramps.
This concept is not recommended because of the significant impacts to
the adjacent wetland area and the less desirable deceleration loop ramp
for eastbound U.S. 20 traffic wishing to go south on the Southwest
Arterial. This eastbound exit loop would require U.S. 20 traffic to slow
down drastically at the bottom of the hill, causing an undesirable condition
for traffic.
Concept B - Evaluated a standard diamond interchange configuration. This concept is
recommended as the preferred alternative because it offers the safest and
most recognized layout, avoids loop ramps, fits well with surrounding
properties, avoids major wetland impacts and separates the interchange
traffic from the local access roads.
Concept C - Evaluated a mixed configuration that included a folded diamond loop ramp
and standard diamond. This concept is not recommended because in
comparison to Concept B, it would involve a less desirable loop ramp
design and would introduce a lower speed entrance to U.S. 20 at the
bottom of the hill. This condition would make it more difficult for
commercial trucks to reach speed on U.S. 20.
Each of the interchange configurations evaluated (Concept A, B and C) will require the
acquisition of new right -of -way property. However, each configuration eliminated the
need to purchase three (3) properties along Cousins Road, thus reducing the costs for
acquisition / relocation in the magnitude of $1.5 million.
We feel that it is important to note that the three (3) residential properties along Cousins
Road were identified in the original Environmental Assessment (EA) Study as well as in
the Preliminary Design phase (completed in March, 2008) as total property acquisitions
and relocations. In November, 2009, City staff met with two (2) property owners and
informed them of the VE study and the recommendations to re- evaluate the SW Arterial
/ U.S. 20 / Seippel Road interchange area. Staff informed the property owners that the
possible modifications could impact if their properties would be acquired or not. The
residents expressed mixed feelings on the purchase of there homes but strongly
opposed that Cousins Road may become a frontage road access to serve properties
along U.S. 20 and potentially future access to the landfill.
The recommended preferred alternative, Concept B, will reconstruct and extend
Cousins Road to serve one (1) commercial property on U.S. 20. The frontage road will
not be extended to serve the landfill as part of the Southwest Arterial project. However,
the frontage road alignment will be designed so that it could be extended to the landfill
at some future date when the Iowa DOT implements access control restrictions along
the U.S. 20 corridor and the landfill's direct access to U.S. 20 is eliminated. The Iowa
DOT has no immediate plans to implement access control along the U.S. 20 corridor
and it could be 10 to 30 years before any such plans move forward.
NORTH CASCADE / ENGLISH MILL ROAD INTERCHANGE CONFIGURATION
The North Cascade / English Mill Road interchange has been modified as shown in the
on the attached exhibit. Those revisions included the use of roundabout intersections at
the ramps, which allow the loop ramp to be eliminated from the interchange. The
amount of right -of -way occupied by the interchange was reduced by approximately 9
acres.
U.S. 151 / 61 INTERCHANGE CONFIGURATION
The U.S. 151 / 61 interchange has been modified as shown on the attached exhibit.
Those revisions included the use of roundabout intersections at the ramps and reducing
the width of the new bridge across U.S. 151 / 61 by one lane.
PUBLIC INFORMATIONAL MEETING
Due to the proposed design and configuration changes to the Southwest Arterial
project, the City will be hosting a public informational meeting to share the proposed
plan modifications. This meeting will be open to the general public and will provide
information and describe the project to citizens and provide an opportunity for public
input, feedback and comments.
Following the public informational meeting, the design team will review the public input
received and will then present to City Council, DMATS and the Iowa DOT a final design
recommendation prior to proceeding with the final engineering design phase.
ACTION TO BE TAKEN
This memorandum and attachments are provided for informational purposes.
Attachs.
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Future Access to
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U.S. Hwy. 20 Interchange
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November 2010 City of Dubuque, Iowa 60180237,
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Concept A
Southwest Medal
November 2010 City of Dubuque, Iowa 60180231
Southwest Arterial
Project Status Update
Robert Schiesl
Assistant City Engineer
Southwest Arterial Project
PROJECT PARTNERSHIP
The #1 Surface Transportation Priority in the Dubuque
Area For:
Dubuque City Council
Dubuque County Board of Supervisors
Dubuque Metropolitan Area Transportation Study (DMATS)
Greater Dubuque Development Corporation
Dubuque Area Chamber of Commerce
Continuing to move forward with the development of the Southwest
Arterial
Southwest Arterial Project
Project Development
•
Connects U.S. Hwy 20 with U.S. Hwy 61/151
•
4-lane Divided Freeway (6.1 Miles)
•
Priority 1 Access Control
•
Three Interchanges
Hwy 20, Hwy 61/151, N. Cascade Road
•
Full Build Cost Estimate $125 Million
Southwest Arterial Project
Corridor Alignment Map
Dubuque is the regional economic center for the
Iowa, Illinois and Wisconsin tri-state area
Southwest Arterial Project
Where Are We Today?
NEPA Clearance
-
Completed 2004
-
Preliminary Engineering Design
Completed 2008
•
Final Engineering Design
Underway
•
Right-of-Way Property Acquisition
Underway
•
Archaeological & Cultural Resource Mitigation
Underway
•
Construction
Under Contract -N. Cascade Reconstruction
Southwest Arterial Project
Value Engineering (VE) Study
Preliminary Design Evaluation & Recommendations
•
Value Engineering Study
-Completed December, 2009
Identify potential modifications that might decrease construction cost
Increase the value of the project
•
Preliminary design evaluation
-Completed November, 2010
•
10 -Initial VE Alternatives were evaluated
7 -VE Concepts Recommended For Further Consideration
Potential total estimated VE savings: $7,500,000
3 -VE Concepts Not Recommended
•
Most significant VE recommendations are the proposed
modifications to the SW Arterial / U.S. 20 / Seippel Road
interchange area. Potential savings $6,200,000
US 20 Interchange -Concept A
Evaluated
Not Recommended
•
Folded diamond with
loop ramps
•
Wetland Impacts
•
Exit Loop Ramp
Speed Deceleration
Bottom of Hill
Safety Concern
•
Entry Loop Ramp
Slow Entry Speed
Merging Traffic
Safety Concern
US 20 Interchange -Concept A
Evaluated
Not Recommended
•
Folded diamond with
loop ramps
•
Wetland Impacts
•
Exit Loop Ramp
Speed Deceleration
Bottom of Hill
Safety Concern
•
Entry Loop Ramp
Slow Entry Speed
Merging Traffic
Safety Concern
US 20 Interchange -Concept A
Evaluated
Not Recommended
•
Folded diamond with
loop ramps
•
Wetland Impacts
•
Exit Loop Ramp
Speed Deceleration
Bottom of Hill
Safety Concern
•
Entry Loop Ramp
Slow Entry Speed
Merging Traffic
Safety Concern
US 20 Interchange -Concept A
Evaluated
Not Recommended
•
Folded diamond with
loop ramps
•
Wetland Impacts
•
Exit Loop Ramp
Speed Deceleration
Bottom of Hill
Safety Concern
•
Entry Loop Ramp
Slow Entry Speed
Merging Traffic
Safety Concern
US 20 Interchange -Concept C
Evaluated
Not Recommended
•
Mixed configuration:
Standard diamond with
a folder diamond / loop
ramp
•
Avoids Environmental
Impacts
•
Entry Loop Ramp
Lower Entry Speed
Merging Traffic
Safety Concern
US 20 Interchange -Concept C
Evaluated
Not Recommended
•
Mixed configuration:
Standard diamond with
a folder diamond / loop
ramp
•
Avoids Environmental
Impacts
•
Entry Loop Ramp
Lower Entry Speed
Merging Traffic
Safety Concern
US 20 Interchange -Concept B
Recommended
Original
US 20 Interchange
Cross Over
Bridge
US 20 Interchange -Concept B Design
Revisions
Recommended
•
Move centerline 200’
north, reducing bridge
lengths
•
Change ramps to a
“diamond interchange”
configuration
•
Eliminate loop ramps
•
Eliminate crossover
bridge over US 20
•
Eliminate access
frontage road near
Menards
•
Use roundabout
intersections
•
Reduce environmental
and property impacts
•
Reduce project cost by
approx. $6.2 million
N. Cascade Road / English Mill
Design
Interchange Layout
Revisions
•
Diamond interchange
•
Use roundabout
intersections
•
Eliminate loop ramp
•
Reduce property
impacts by approx.
9 acres
•
Reduce project cost
by approx. $240,000
•
VE Alternative
Eliminate interchange
No at-grade intersections
Priority 1 access control
N. Cascade Road / English Mill
Design
Interchange Layout
Revisions
•
Diamond interchange
•
Use roundabout
intersections
•
Eliminate loop ramp
•
Reduce property
impacts by approx.
9 acres
•
Reduce project cost
by approx. $240,000
•
VE Alternative
Eliminate interchange
No at-grade intersections
Priority 1 access control
N. Cascade Road / English Mill
Design
Interchange Layout
Revisions
•
Diamond interchange
•
Use roundabout
intersections
•
Eliminate loop ramp
•
Reduce property
impacts by approx.
9 acres
•
Reduce project cost
by approx. $240,000
•
VE Alternative
Eliminate interchange
No at-grade intersections
Priority 1 access control
N. Cascade Road / English Mill
Design
Interchange Layout
Revisions
•
Diamond interchange
•
Use roundabout
intersections
•
Eliminate loop ramp
•
Reduce property
impacts by approx.
9 acres
•
Reduce project cost
by approx. $240,000
•
VE Alternative
Eliminate interchange
No at-grade intersections
Priority 1 access control
Military Road Area
Revisions
•
Eliminate retaining walls
•
Added bike / pedestrian
trail between Military
Road and US 151 / 61
•
Provide landscaped cut
slopes on both sides of
Southwest Arterial
Original Tiered Wall Concept
•
Requires additional
property acquisition
•
Reduce project cost
by approx. $2 Million
•
VE Alternative
Construct tunnel
Cost prohibitive
Landscaped Slopes
Recommended
Design
Revisions
•
Use roundabout
intersections
•
Eliminate 2 bridges
on ramps, switch to
box culvert
•
Added bike / pedestrian
trail through interchange
to Old Davenport Road
•
Reduce project cost
by approx. $400,000
US 151 / 61
Interchange Layout
Design
Revisions
•
Use roundabout
intersections
•
Eliminate 2 bridges
on ramps, switch to
box culvert
•
Added bike / pedestrian
trail through interchange
to Old Davenport Road
•
Reduce project cost
by approx. $400,000
US 151 / 61
Interchange Layout
Roundabouts move traffic safely & efficiently:
•
Slower speeds
•
Fewer conflict points
•
Easy decision making
Roundabouts provide:
•
90% reduction in fatal crashes
•
76% reduction in injury crashes
•
30-40% reduction in pedestrian crashes
•
10% reduction in bicycle crashes
•
No traffic signal costs
•
Environmental benefits
Southwest Arterial
Project Schedule
•
N. Cascade Road Grading -Stage 1Oct -Nov 2010
•
N. Cascade Road Grading -Stage 2July 2011 -Sept 2011
•
N. Cascade Road BridgeMarch 2011 -July 2011
•
English Mill Road Utility RelocationSummer 2011
•
English Mill Road Grading & BridgeJuly 2011 -Nov 2011
•
Military Road Grading & BridgeSummer 2012 **
•
SW Arterial Grading, 4-LaneTo be Determined **
•
SW Arterial Paving, 2-LaneTo be Determined **
**
Schedules are subject to change, based on funding availability
North Cascade Road
Under Construction
North Cascade Road
Under Construction
N. Cascade Bridge
North Cascade Road Bridge
Architectural Rendering
Summer 2011
North Cascade Road Bridge
Architectural Rendering
North Cascade Road Bridge
Architectural Rendering
North Cascade Road Bridge
Architectural Rendering
Southwest Arterial Project
Funding Summary
AppropriationsAmount
*
Federal Funding$32,805,334
**
State Funding$17,760,000
City / County Funding$15,808,967
Total Federal / State / Local Funding:$66,374,301
*
After SAFETEA-LU obligation limitations applied
**
State funding programmed in FY2013 / 2014
Expenditure Obligation Summary
FY 2009 -2010$21,923,942
FY 2011$6,057,500
Total Expenditure Obligation:$27,981,442
Southwest Arterial Project
Interim Build Alternative
Pave 2-Lane Highway (Hwy 20 to Hwy 61/151)
Property Acquisition (4-Lane, Hwy 20 -Hwy 61/151)$ 9.8 Million
Iowa DOT -Land Acquisition Services$ 330,000
Final Engineering Design$ 8 Million
Mitigation$ 2 Million
Construction$ 78.2 Million
•
Grading (4-Lane, Hwy 61/151 -Hwy 20)
•
Pave 2-Lanes (Hwy Hwy20 -Hwy 61/151)
•
Partial Interchange (Hwy 20)
•
Partial Interchange (Hwy 61/151)
•
Temp At-Grade Intersection (N. Cascade)
Interim Build Cost Estimate:$ 98.3 Million
Southwest Arterial Project
Project Cost
Interim Build Cost Estimate$ 98.3 Million
•
2-Lane Highway
•
Hwy 20 to Hwy 61/151
Federal Funding$ 32.8 Million
State Funding$ 17.8 Million
Local Funding$ 15.8 Million
Funding Gap$ 32 Million
Southwest Arterial
Project Status Update
Questions?