Loading...
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. se00els neWS20.ConseptA 11/12/2010 LAvOrk \project \113034\Cmild\DISolaylVr\SchlesCencepts.12Nevtrbesn Future Access to Barrington Lakes 1 I 0 I 5" SCALE IN FEET AECOM U.S. Hwy. 20 Interchange Concept A Southwest Arterial November 2010 City of Dubuque, Iowa 60180237, /2/2010 .AvOrMoroleet\ 13036% wdd\ 0fsobyP0F %SUdesKonceots.etb00,dsn Possible Future Cousins Road Connection - -Major Culvert Future Access to Barrington Lakes co Proposed Bridge , Proposed Pavement Wetland Limits Closures 0 500 SCALE A:COM U.S. Hwy. 20 Interchange Concept B Southwest Arterial November 2010 City of Dubuque, lowo 60180237, node!: rer1.1520,ConceptC P/12/2010 • Awnek %nen lar ;1■11(11SArtkirikftiqrsIns.PAr 4111Astnntant 17NoviC1 eNn • _AssestAA 11 11 11 It ir Future Access to 4/ Barrington Lakes li 1 1 0 SOO I SCALE IN FEET A=COM U.S. Hwy. 20 Interchange Concept C Southwest Arterial November 2010 Citv of Dubuque, loo 60180237. II/12/2010 'sbark\proke tmi3036 \ coda \OlsDlovPDC ∎S W esConcepts.l2Nov10.dsn 0 500 SCALE IN FEET A=COM North Cascade Road / English Mill Road Interchange Concept Southwest Arterial November 2010 City of Dubuque, Iowa 60180237 noov: neuszo.conceoo 11/12/2000 LAwork \ project \HST% \ ende vPDF SchlesConceots_121iovIOAsn 0 SCALE IN FEET 500 A:COM U.S. Hwy. 61 Interchange 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?