5.11.
CC Regular Session
- Meeting Date:
- 04/28/2020
- By:
- Bruce Westby, Engineering/Public Works
Information
Title
Adopt Resolution #20-084 Accepting Proposals and Awarding Contract for 2020 Ground Penetrating Radar Pavement Evaluations, Improvement Project #20-06
Purpose/Background:
Purpose:
The purpose of this case is adopt Resolution #20-084 accepting proposals and awarding a contract for 2020 Ground Penetrating Radar Pavement Evaluations, Improvement Project #20-06.
Background:
On several occasions in recent years, pavement management program (PMP) projects listed in the City’s Capital Improvement Program (CIP) could not be completed as proposed due to deficient bituminous pavement sections. This generally resulted in one of two outcomes. Either the project moved forward with significant project cost over-runs due to an increase in project scope needed to address the pavement deficiencies, or the project was canceled. When a project is canceled, property owners expecting the project to occur that year must then be informed that the project is no longer moving forward. In addition, replacement projects are typically explored and as has often been the case the replacement project is often not found to be feasible due to the pavement section again being deficient.
Pavement sections are considered deficient when the section is not thick enough to support pavement milling operations, or when the structural integrity of the pavement is so poor that the pavement will fall apart upon attempting to mill it.
A prime example of this occurred in 2017 when several street segments in the Rivers Bend development were proposed to receive mill and overlay improvements in 2017, but after soil borings and pavement corings were completed as part of the Feasibility Report process it was discovered the pavement was too thin to effectively mill and overlay so the street had to be reconstructed instead, which was done in 2018. As a result, in 2017 Staff researched available options for evaluating the thickness and structural integrity of existing pavement sections and determined that two primary options existed.
The first option is to physically collect and examine pavement cores. Cores are collected at pre-determined locations using a hole saw to extract a cylindrical pavement core from the street. The core is then examined to determine the thickness and structural integrity of the pavement section at that location. Though this provides the most conclusive evidence as to the depth and integrity of the existing pavement section, it only provides information at the location where the core was taken. As has been found numerous times, the thickness and structural integrity of pavement sections differs significantly from one location to another.
The second option is to collect ground penetrating radar data. Ground penetrating radar was previously primarily used to locate items buried underground such as vaults and graves. However, this technology is being used more and more frequently to evaluate existing pavement sections. Data is collected in 1 to 2 foot intervals along a street segment, depending on the speed at which the vehicle the radar unit is attached to is traveling. The radar is strong enough to penetrate the top foot or so of the pavement section, revealing changes in material densities between the bituminous or concrete pavement section, the aggregate base section, and subgrade soils beneath. A minimal number of pavement cores are also extracted on the street segmented being evaluated to calibrate the readings and to verify the specific pavement and aggregate base materials, as well as the subgrade soils.
In 2017, the City collected ground penetrating radar data to evaluate existing pavement sections on 32.7 miles of public streets proposed to be reconstructed or to receive pavement mill and overlay improvements in the 2017 - 2026 CIP. Proposals were received from the two companies known to provide such services at the time; Braun Intertec Corporation and American Engineering Testing, Inc. Braun Intertec submitted the lowest proposal fee and was awarded the contract in 2017.
Fast forward to 2020 and the need to review our 10-year CIP comprehensively to ensure all of the PMP projects listed in it can likely be completed as proposed, and that the estimated costs accurately represent the work required to complete the project. Staff has reviewed all available information for public street segments across the City and has identified 117 miles of public streets that have no as-built record plans or project inspection records to identify the existing pavement section with confidence. Attached is a map showing these 117 miles of street segments (shown in blue), as well as the 32.7 miles of street segments on which GPR data was collected in 2017 (shown in red).
Requests for Proposals for collecting GPR data on up these 117 miles of City streets were again submitted to Braun Intertec Corporation and American Engineering Testing, Inc., and both firms submitted proposal responses by the due date of Tuesday, April 21, 2020. A copy of the RFP is attached for reference. The proposal fees received from both companies are tabulated below.
Braun Intertec’s proposal fee is the lowest and Staff recommends awarding a contract for the 2020 ground penetrating radar pavement evaluations to Braun Intertec.
Braun is required to maintain minimum insurance coverages, and to complete all field work during normal working hours between 7 AM and 8 PM, Monday through Friday, in accordance with City ordinances. Field work primarily consists of driving a pickup truck with a GPR collection unit mounted on a trailer hitch at normal operating speeds along each street segment to be analyzed. In addition, a minimal number of pavement cores are also collected for use in calibrating the data. The pavement core holes are then backfilled and patched.
Braun must complete their work and deliver their final report to the City by Thursday, July 2, 2020. This will allow staff to conduct a comprehensive review of all PMP projects (pavement overlay and reconstruction projects) listed in the 2021-2030 CIP by this fall.
The purpose of this case is adopt Resolution #20-084 accepting proposals and awarding a contract for 2020 Ground Penetrating Radar Pavement Evaluations, Improvement Project #20-06.
Background:
On several occasions in recent years, pavement management program (PMP) projects listed in the City’s Capital Improvement Program (CIP) could not be completed as proposed due to deficient bituminous pavement sections. This generally resulted in one of two outcomes. Either the project moved forward with significant project cost over-runs due to an increase in project scope needed to address the pavement deficiencies, or the project was canceled. When a project is canceled, property owners expecting the project to occur that year must then be informed that the project is no longer moving forward. In addition, replacement projects are typically explored and as has often been the case the replacement project is often not found to be feasible due to the pavement section again being deficient.
Pavement sections are considered deficient when the section is not thick enough to support pavement milling operations, or when the structural integrity of the pavement is so poor that the pavement will fall apart upon attempting to mill it.
A prime example of this occurred in 2017 when several street segments in the Rivers Bend development were proposed to receive mill and overlay improvements in 2017, but after soil borings and pavement corings were completed as part of the Feasibility Report process it was discovered the pavement was too thin to effectively mill and overlay so the street had to be reconstructed instead, which was done in 2018. As a result, in 2017 Staff researched available options for evaluating the thickness and structural integrity of existing pavement sections and determined that two primary options existed.
The first option is to physically collect and examine pavement cores. Cores are collected at pre-determined locations using a hole saw to extract a cylindrical pavement core from the street. The core is then examined to determine the thickness and structural integrity of the pavement section at that location. Though this provides the most conclusive evidence as to the depth and integrity of the existing pavement section, it only provides information at the location where the core was taken. As has been found numerous times, the thickness and structural integrity of pavement sections differs significantly from one location to another.
The second option is to collect ground penetrating radar data. Ground penetrating radar was previously primarily used to locate items buried underground such as vaults and graves. However, this technology is being used more and more frequently to evaluate existing pavement sections. Data is collected in 1 to 2 foot intervals along a street segment, depending on the speed at which the vehicle the radar unit is attached to is traveling. The radar is strong enough to penetrate the top foot or so of the pavement section, revealing changes in material densities between the bituminous or concrete pavement section, the aggregate base section, and subgrade soils beneath. A minimal number of pavement cores are also extracted on the street segmented being evaluated to calibrate the readings and to verify the specific pavement and aggregate base materials, as well as the subgrade soils.
In 2017, the City collected ground penetrating radar data to evaluate existing pavement sections on 32.7 miles of public streets proposed to be reconstructed or to receive pavement mill and overlay improvements in the 2017 - 2026 CIP. Proposals were received from the two companies known to provide such services at the time; Braun Intertec Corporation and American Engineering Testing, Inc. Braun Intertec submitted the lowest proposal fee and was awarded the contract in 2017.
Fast forward to 2020 and the need to review our 10-year CIP comprehensively to ensure all of the PMP projects listed in it can likely be completed as proposed, and that the estimated costs accurately represent the work required to complete the project. Staff has reviewed all available information for public street segments across the City and has identified 117 miles of public streets that have no as-built record plans or project inspection records to identify the existing pavement section with confidence. Attached is a map showing these 117 miles of street segments (shown in blue), as well as the 32.7 miles of street segments on which GPR data was collected in 2017 (shown in red).
Requests for Proposals for collecting GPR data on up these 117 miles of City streets were again submitted to Braun Intertec Corporation and American Engineering Testing, Inc., and both firms submitted proposal responses by the due date of Tuesday, April 21, 2020. A copy of the RFP is attached for reference. The proposal fees received from both companies are tabulated below.
| Company | Proposal Fee |
| Braun Intertec Corp. | $64,935 ($555 / mile) |
| American Engineering Testing, Inc. | $90,675 ($775 / mile) |
Braun Intertec’s proposal fee is the lowest and Staff recommends awarding a contract for the 2020 ground penetrating radar pavement evaluations to Braun Intertec.
Braun is required to maintain minimum insurance coverages, and to complete all field work during normal working hours between 7 AM and 8 PM, Monday through Friday, in accordance with City ordinances. Field work primarily consists of driving a pickup truck with a GPR collection unit mounted on a trailer hitch at normal operating speeds along each street segment to be analyzed. In addition, a minimal number of pavement cores are also collected for use in calibrating the data. The pavement core holes are then backfilled and patched.
Braun must complete their work and deliver their final report to the City by Thursday, July 2, 2020. This will allow staff to conduct a comprehensive review of all PMP projects (pavement overlay and reconstruction projects) listed in the 2021-2030 CIP by this fall.
Notification:
Notifications are not required for this case.
Observations/Alternatives:
Observations:
Fees were requested on a per mile basis to allow for collection of additional data on other street segments, if needed.
Alternative #1 - Adopt Resolution #20-084 accepting proposals and awarding a contract for 2020 Ground Penetrating Radar Pavement Evaluations, Improvement Project #20-06.
Funding Source:
Braun’s proposal fee is $64,935.
On February 24, 2020, the City Council adopted Resolution #20-038 indefinitely suspending the City’s annual sealcoat program and reallocating the $500,000 budgeted for 2020 crack seal and seal coat improvements. This included a Staff recommended allocation of $75,000 for collecting ground penetrating radar (GPR) data on public street segments for which no pavement section data is available. Such data includes as-built record plans, which are construction plans that have been modified to reflect actual conditions after construction is complete, or project inspection records.
On February 24, 2020, the City Council adopted Resolution #20-038 indefinitely suspending the City’s annual sealcoat program and reallocating the $500,000 budgeted for 2020 crack seal and seal coat improvements. This included a Staff recommended allocation of $75,000 for collecting ground penetrating radar (GPR) data on public street segments for which no pavement section data is available. Such data includes as-built record plans, which are construction plans that have been modified to reflect actual conditions after construction is complete, or project inspection records.
Recommendation:
City staff recommends Alternative #1.
Action:
Adopt Resolution #20-084 accepting proposals and awarding a contract for 2020 Ground Penetrating Radar Pavement Evaluations, Improvement Project #20-06.
Attachments
Form Review
| Inbox | Reviewed By | Date |
|---|---|---|
| Kurt Ulrich | Kurt Ulrich | 04/23/2020 03:11 PM |
- Form Started By:
- Bruce Westby
- Started On:
- 04/20/2020 02:29 PM
- Final Approval Date:
- 04/23/2020