2013-12-30 Scope Amendment Internal Meeting Background –
Lawrence Transit Center Location Analysis
Develop a scope amendment to 013-0542, Lawrence Transit Center Locational Analysis, to develop materials for a neighborhood public meeting to be held in mid-January.
Project Background:
Olsson was hired to guide a GIS-based siting project for a new transit center, and then to develop conceptual costs. Olsson has developed a rough plan for a site at 9th Street and Centennial Drive (just west of 9th Street and Iowa Street), and more developed plans for a site at 21st Street and Stewart Avenue.
City recently held a neighborhood meeting for 21st and Stewart Avenue where city was asked about A) Potential traffic impacts from both new transit center, and new traffic signal that would have to be installed at 21st and Iowa and B) if similar meetings were held at the 9th Street and Centennial Drive neighborhood.
Scope Amendment
City wants us to develop a scope amendment to determine the following:
For 21st and Stewart Avenue:
· What’s the traffic impact from a new traffic signal at 21st and Iowa, and a new transit center? Neighborhood is concerned about additional cut through traffic caused by the signal, and additional bus and vehicle traffic brought by the transit center.
· Will parts of 21st Street and/or Stewart Avenue have to be repaved or widened to accommodate the additional bus and vehicle traffic? What is this cost?
For 9th Street and Centennial Drive:
· What’s the traffic impact for a new traffic signal at 9th Street and Rockledge Road, and a new transit center?
· Will parts of 9th Street or Rockledge Road have to be repaved or widened to accommodate the additional bus and vehicle traffic? What is this cost?
Scope
Task 1 – Traffic Counts
24-hour traffic counts
Collect 24-hour counts on all approaches at the following intersections:
o 9th & Rockledge (4 Approaches/4-Lanes)
o 21st & Iowa (4 Approaches/6-Lanes)
Peak Hour Manual turning movement counts
Two-hour traffic volume counts will be collected for typical weekday AM (7-9) and PM (4-6) peak hours at the following intersections:
o 9th & Rockledge
o 9th & Iowa*
o 21st & Iowa
o 21st & Ousdahl*
o 21st & Naismith*
*Traffic counts at these intersections will not be completed until the 2nd week of KU second semester, estimated to be completed January 28th - 30th, 2014.
Task 2 – Traffic Signal Warrant
Traffic signal warrants 1, 2, 3, and 7 will be reviewed using the traffic count data collected to determine if a warrant is met for the intersections of 9th & Rockledge and 21st & Iowa. Crashes will be reviewed for 9th & Rockledge and 21st & Iowa for the last three years that are correctable with the addition of a traffic signal. Count data will be provided in a figure detailing daily and peak hour volumes for each approach to the intersection. Crash diagrams will be developed documenting the crash history.
Task 3 – Existing + Transit Center Conditions
o Add projected Bus trips to existing traffic Volumes
o Estimate Cut Through Traffic Increase (21st Street Locations only)
§ Estimated Percentage will be provided and approved by City staff
Task 4 – Operational Analysis
Olsson Associates will conduct capacity and queuing analysis for each study intersection, as listed in Task 1, for typical weekday AM and PM peak hour periods for the following scenarios:
o Existing Unsignalized operations
o Existing + Transit (Considering both Signalized and Unsignalized intersection control where appropriate)
Capacity analysis will provide the basis for determining appropriate traffic control and geometric improvements. Queuing analysis will provide the basis for determining the needed length of any auxiliary lanes. Capacity and queuing analysis will be conducted for all study intersections listed in Task 1.
Task 5 – Pavement Coring & Evaluation and Cost Estimating
To evaluate the existing pavement thickness and condition, an Olsson pavement engineer will visit the site to review the condition of the existing wearing surface. During this time, we will obtain asphalt core samples from 3 locations at 9th and Rockledge and from 4 locations near West 21st Street and Stewart. We will notify public utility companies through the Kansas One-Call system. Upon completion of coring, we will obtain a sample of the subgrade soils beneath the pavement section using a thin walled Shelby Tube. We have assumed traffic control will consist of signs, cones and, possibly a flagger to direction cars around the work area. Upon completion, the core holes will be patched with an asphaltic concrete cold mix.
The pavement cores and subgrade soil samples will be returned to our laboratory for visual observation, measurement, testing and classification. Based on the results of the boring and laboratory testing program, we will prepare a pavement engineering memorandum for the project that discusses the existing pavement and subgrade conditions, and, based on these conditions, our opinions on the ability of the pavement to support additional bus traffic or recommended improvement. Cost Estimates for both repaving and adding geometric improvements (I.e. turn lanes), as a result of recommendations from the traffic analysis, will be completed.
Task 6 – Traffic Impact Analysis and Pavement Report
A two (2) phased report will be prepared to address the roadway impact from the proposed along with an engineer’s cost estimate. Phase 1 will include the initial traffic study findings regarding recommendations pertaining to street improvements that are due to the proposed project for the intersections already counted (9th & Rockledge and 21st & Iowa). Phase 2 will be a supplemental memorandum or revised study to incorporate the additional study intersections (9th & Iowa, 21st & Ousdahl, 21st & Naismith) that needed to be counted. All recommendations will be based on signal warrants, capacity and queuing analysis, pavement coring, and engineering judgment. The Geotechnical report may be included the Phase 1 study or may be completed as a separate technical memorandum.
Meetings: Three meetings at 2 hours each is included with the basic scope of services. Additional meetings will be considered additional services and billed at our standard hourly rates plus actual cost on any reimbursable expenses (mileage, copies, presentations materials, etc.). Additional services will be discussed with the Client for approval prior to beginning work.
Compensation: The fee for the scope of services is $25,500. Should Client request work not described and included in the above description of services will be billed on an hourly basis. Additional work will be discussed with and approved by the Client prior to conducting additional services.
Timeline
· Phase 1 of the traffic study and Geotechnical technical memo will be completed and submitted by Friday, January 24th if Notice To Proceed is received no later than January 6th 2014.
· Phase 2 of the traffic study will be delivered as a technical memo in final form by Friday, February 14th assuming traffic counts can be completed January 28th - 30th.
Assumptions:
· Evaluation of Future Traffic Volumes for Signal Warrants or Traffic Operations are not included
· Crash reports for the last three years will be provided by the City for 9th & Rockledge and 21st & Iowa
· No permit costs are included in the budget amount.
· The existing pavement consists of asphaltic concrete.
· Traffic data from the study will be used to complete the pavement evaluation.
· Traffic control for coring work does not include an arrow board.
· Cost estimating will be completed from an aerial provided by the City.
· Per the City the pavement along 9th Street has a PCI of 50
· Per the City the pavement near 21st & Iowa has a PCI of 51