Memorandum
City of Lawrence
Public Works
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TO: |
David L. Corliss, City Manager
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FROM: |
Charles F. Soules, P.E., Director of Public Works
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CC: |
David Cronin, P.E., City Engineer Mark Thiel, Assistant Public Works Director
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Date: |
October 9, 2013
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RE: |
Project PW1135 - 6th & Iowa Geometric Improvements Approve Supplemental Service Agreement for Engineering Design
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Project Description
The primary scope of the 6th & Iowa project has been to include a dedicated left turn lane for west bound traffic. The proposed left turn lane will reduce the average intersection delay, reduce accidents and improve traffic flow in a significant way.
The dedicated left turn lane can be established by widening the roadway to the north and reducing the width of the existing lanes from 12 feet to 11 feet. Sidewalk on the north side will be reconstructed and the existing guard rails on both north and south side of 6th street will be replaced with a combination of concrete safety barrier and new guard rails. Additional improvements include an eastbound right turn lane, new sidewalk on the south side of 6th Street and new traffic signal equipment. Pavement in the intersection will be milled and overlaid as the base is generally in good condition.
The attached general layout sheet shows a plan view of the proposed improvements and traffic lane configuration.
Project Status
Plans are complete. Commissioner Schumm has requested that we look at including a multiuse path on the north side of 6th Street. This would necessitate some plan revisions including extending the reinforced concrete box’s (RCB), additional fill material, and widening of the sidewalk. The additional estimated construction costs are:
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8’ path |
Construction $61,500 |
Engineering $10,000 |
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10’ path |
Construction $100,400 |
Engineering $10,000 |
There is time to make the plan adjustments and keep this project on schedule. The north side does not have any right-of-way or additional utility issues.
Staff would recommend the 10’ path if the City Commission desires to make this change.
Project Funding
In the US-40 turnback agreement KDOT will reimburse the City up to $1.5 million. If we receive good bids this should be enough for the additional improvements.
6th and Iowa Geometric Improvements, PW1135:
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Opinion of Probable |
Engineering Fee |
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Base Project (WB Left, EB Right, NB Reconfigured |
$895,000 |
$72,000 |
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+ Sidewalk South of 6th Street, Ramp to Rockledge |
$25,000 |
$0 |
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+ Reinforced Concrete Box Extension |
$410,000 |
$38,900 |
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+ 10’ Shared-Use Path North of 6th Street |
$100,000 |
$10,000 |
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TOTAL |
$1,430,000 |
$120,900 |
Project Schedule
Revised Plans Complete: December 1, 2013
Advertise and bidding: Mid-Winter
Construction: Spring-Close McDonald Dr. for RCB Extension; Spring/Summer Complete Pavement
Action Item
Authorize City Manager to sign purchase order for supplemental agreement with Landplan Engineering for professional services in the amount of $10,000 for plan revisions to construct a 10’ multiuse path, Project Number PW1135, 6th and Iowa Street Intersection, Geometric Improvements, Westbound Turn Lane.