tac: guideline for the coordination of utility relocations€¦ · row owners and utility agencies...
TRANSCRIPT
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TAC: Guideline for the Coordination of Utility Relocations
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What can we do to reduce Risks associated with the proper management of Utilities as part of a capital project?
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Managing Utility Risks
A Transit Project EA stated:
SUE was not completed within the EA process… An experienced Utility Coordinator was not used on the project…
Minor Utility Relocations will be required, total Project Budget $14M.
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Managing Utility Risks
• Water • Sewer • Telecom • Gas • OH • THES
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Original estimate within the EA was ~$14M Utility impacts increase cost to ~$105M ++
Managing Utility Risks
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Key Lessons Learned
• Accurate, reliable utility drawings at the design stage – ASCE 38-02.
• Clear Utility Coordination process with
experienced UC’s • Reliable records of Utilities – CSA S250.
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Why do we need it?
No Hyperlink
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Agenda
• Intro Existing Tools and UESI
• Intro to the TAC-PUMS Guideline • Relevant Standards and Practices • Case Study
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Who is T2 Utility Engineers?
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How do we manage Utility Risks
Subsurface Utility Engineering (Mapping, CCTV, EM, GPR, Geophysics)
Utility Coordination
Utility Design
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The Vision Collaboration
UESI VISION
UESI will be the worldwide leader in generating products and services that promote and reward excellence in the engineering, planning, design, construction, operations, and asset management for utility infrastructure and engineering surveying.
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Managing Utility Risks on Projects
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Utility Management “Tool Box”
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Project was initiated in Spring 2013.
All content developed by the subcommittee.
Goal for final publication 2016.
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Objective of the Guideline
• The purpose of the guideline is to assist various ROW owners and Utility agencies to develop or enhance their utility coordination processes. A great efficiency can be realized by standardizing these processes across all areas of the country. For Utilities with infrastructure in a variety of areas it gives them a consistent process they can follow when working with any ROW owner. For ROW owners it allows them to learn from the best practices and procedures of different parties and implement a process that will be readily accepted and adopted by utility agencies.
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Objective of the Guideline
• The Coordination guideline does not constitute policy, a standard, a specification or a regulation. It is a best practices guideline developed from a review of current practices across North America. Each ROW owner and utility agency is encouraged to follow it as the basis for their processes and enhance it with details specific to their area, situation or other unique criteria.
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Intended Audience
• These guidelines have been written for both the public land road authorities, consultants and the utility agencies, with a specific focus on projects initiated by the Road Authority.
• Although this guideline is directed towards the Road Authorities it can be used by other agencies such as transit, land development and others with applicable projects. It is specifically designed with the Design – Bid – Build process in mind. It is acknowledged, that using a Design-Build, PPP or other procurement process will introduce unique parameters however the general fundamental principles will still apply.
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Guideline Format
Flow Chart
Document
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Planning Stage
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• Prelim Design
• Detailed Design
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• Construction Phase
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Guideline Format
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Utility Coordination
• Utility Coordination is a fundamental aspect
of all capital projects.
• Utility Coordinators manage one of the highest risk elements on projects.
• Experience is key!
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Role of the Utility Coordinator
• Coordinate between Designer and Utilities • Review impact of design on utilities • Analyze conflicts and recommend revisions to design
OR utility relocation, protection • Prepare preferred utility design – factor in
constructability, scheduling, cost
• Provide Utilities with preferred design or D&B for them
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UC Conflict Matrix
The use of a detailed utility conflict matrix to track Utility issues on projects.
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Sample - Finch West LRT
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Sample – TTC Union Station Expansion
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Associated Standards
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Standards- ASCE 38-02
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SUE Quality Levels
A, B, C, D Most Accurate Least Accurate
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Quality Levels on Drawings
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Standards – CSA S250
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Standards – CSA S250
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Standards – CSA S250
Accuracy
level Description Reference
1
Accurate to within +/- 25 mm in the x, y, and z
coordinates, and referenced to an accepted geodetic
datum with a 95% confidence level.
Absolute
2
Accurate to within +/- 100 mm in the x, y, and z
coordinates, and referenced to an accepted geodetic
datum with a 95% confidence level.
Absolute
3
Accurate to within +/- 300 mm in the x, y, and z
coordinates, and referenced to an acceptable geodetic
datum or topographical and cadastral features with a 95%
confidence level.
Absolute or
relative
4
Accurate to within +/- 1000 mm in the x, y, and z
coordinates, and referenced to an acceptable geodetic
datum or topographical and cadastral features with a 95%
confidence level.
Absolute or
relative
5
Accurate to within +/- 1000 mm in the x and y
coordinates, and referenced to an acceptable geodetic
datum or topographical and cadastral features with a 95%
confidence level.
Absolute or
relative
0 No information available related to spatial accuracy.
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SUE and Risk Management C
ost o
f In
form
atio
n
Pro
ject R
isk
Information
CostRisk
a b c
UofT Study - ROI = $4.62
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Guideline’s Process - Standards
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What is SUE
A branch of engineering practice that involves managing certain risks associated with utility mapping at appropriate quality levels, utility coordination, utility relocation design and coordination, utility condition assessment, communication of utility data to concerned parties, utility relocation cost estimates, implementation of utility accommodation policies and utility design.
Definition from CI/ASCE 38-02
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Most Accurate Least Accurate
SUE Quality Levels
A B C D
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Drawing
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Quality Level “D”
• Records Research Quality Level ‘D’:
Information derived from existing records or verbal recollections.
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QLD – Request Utility Information
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QLD – Document Information Received
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QLD – As Shown on drawing
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Quality Level “C”
• Visible Features
Quality Level ‘C’:
Information obtained by surveying and plotting visible above ground utility features and by using professional judgement in correlating this information to the quality level ‘D’ information.
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QLC – Using Surveyed Surface Features……..
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in combination with measuring depth and visually verifying alignments.
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QLC - As shown on drawing
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Quality Level “B”
• Designating (Horizontal Position)
Quality Level ‘B’:
Information obtained through the application of appropriate surface geophysical methods to determine the existence and approximate horizontal position of the utilities.
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QLB - As shown on drawing
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QLB – Using the required equipment to obtain the horizontal alignment..
• Electromagnetic Methods
– Cable Locate Equipment
– Sonde
– CCTV Camera with sonde
– Ground Penetrating Radar
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Cable Locate Equipment
Principle • Alternating current through a conductor induces a
magnetic field
Methods • Direct connect • Inductive coupling • Induction
38.0 38.0 45.5
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Some cable locate equipment used by T2
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Sonde
Principle • Transmitter is transported through open conduit for
detection on the surface
Methods • Fiberglass reel • Tethered float • Diver
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CCTV – The Pro’s
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Ground Penetrating Radar
GPR detects metallic and non-metallic, natural and man-made underground features, including utilities, storage tanks, rebar, sinkholes, voids, water table, buried artifacts, grave sites and more.
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Quality Level “A”
• Test Holes (Precise vertical & horizontal alignment)
Quality Level ‘A’:
Precise horizontal & vertical location of a utility by the actual exposure & subsequent measurement of the utility.
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T2ue Air Vac Unit
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Hydro Vac Unit
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QLA - As shown on drawing
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Additional Services
• There are many other field tasks that assist with SUE investigations:
A quality level will be assigned to utilities based on the results of the following investigations.
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Confined Space Entries
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Water Chamber Investigations
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Telecom MH Investigations
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Aerial Inventory
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Final Deliverables
Compiling all available information with professionally signed & sealed deliverables.
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