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Brentwood City Commission Agenda

Meeting Date:	03/14/2016
Resolution 2016-13 - Authorizing Agreement with Neel-Schaffer, Inc. for Design Services for a Roundabout at Crockett Road/Green Hill Boulevard
Submitted by:	Mike Harris, Engineering
Department:	Engineering

Information

Subject

Resolution 2016-13 - Authorizing an agreement with Neel-Schaffer, Inc. for engineering services for design of a roundabout at Crockett Road/Green Hill Boulevard

Background

Improving traffic flow and reducing delays in Brentwood is a top priority for the City. During budget preparations each year, staff seeks to identify potential projects that improve the City's transportation system, especially along arterial roads. One such project identified last year was the potential of constructing a traffic signal or roundabout at the intersection of Crockett Road and Green Hill Boulevard. The existing four-way stop at this location causes significant delays on Crockett Road during the morning and afternoon peak periods.

Staff asked Neel-Schaffer, Inc. to investigate the feasibility of constructing a roundabout at this location and to compare the expected operational performance to a traffic signal. The results indicate a signal and roundabout would perform similarly during peak periods, but the roundabout exhibited improved performance over the signal during off-peak periods. Additionally, staff identified several more subjective advantages of a roundabout at this location, including:

Less right-of-way needs/impact to adjacent properties
No light spill over to adjacent properties from the signals, especially when in flash mode at night
Less noise compared to vehicles stopping/starting/idling at a signal

Many of the design considerations for a roundabout as well as the level-of-service (LOS) comparisons are included in the attached preliminary analysis document. It should be noted that one of the unique challenges of this project will be construction of the roundabout within the existing intersection while maintaining traffic flow. Detour options at this location are practically non-existent, so close coordination between the contractor and affected utilities will be important. Also, consideration will be given to allowing for some degree of night time work as well as a possible early completion bonus built into the contract.

Given the initial work on this project, staff is recommending approval of an agreement with Neel-Schaffer to design the roundabout, prepare bid documents, and provide construction administration services. Initial survey work and a preliminary layout (see attached) have already been completed. The cost to provide these services is $73,500. A copy of Neel-Schaffer's proposal is attached.

Staff recognizes the importance of ensuring this roundabout functions efficiently and is aesthetically pleasing. Staff also believes it is important that this roundabout be consistent and similar from a driver's perspective with the one proposed just west of this site that will serve the Witherspoon development. To that end, staff asked Neel-Schaffer to consult with the designer of the Witherspoon roundabout, Ragan Smith, and to include coordination with Ragan Smith as part of the design process. That coordination is included in the attached fee proposal.

If the agreement with Neel-Schaffer is approved, the tentative schedule would call for design work to be complete this summer with right-of-way acquisition occurring fall of 2016. The target date to award a construction contract would be late fall of 2016 with utility relocation work occurring early 2017 and actual roundabout construction beginning spring of 2017 with a targeted completion by the end of summer 2017. Obviously, this schedule is subject to change as we get farther along in the design process for this project. As much as possible, any short-term closures of the intersection, if necessary to facilitate construction, will be performed while school is out of session to reduce traffic impacts.

Please direct any questions to the Engineering Director.

Staff Recommendation

Staff recommends approval.

Previous Commission Action

No previous Commission action on this item.

Fiscal Impact

Amount :	$73,500
Source of Funds:	Capital Projects Fund
Account Number:	311-43100-1042

Fiscal Impact:

The approved CIP and Capital Projects Fund includes $40,000 for design services for this project. The fee is higher than originally estimated due in part to the additional services staff requested including the peer review as well as a higher than normal level of oversight of construction. Additional funds will be programmed for this project as part of the FY 2017 CIP budget process.

Attachments
Resolution 2016-13
Agreement
Preliminary Analysis
Roundabout Layout
Signed Resolution