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Legacy Cross Bore - Identifying and Eliminating
Elimination of damage, injury and death to a high degree of certainty are the typical primary goals of a Legacy Cross Bore Elimination Project.
Legacy Cross Bore Elimination Project
Flow Chart is available.
SEE full document for
Leading Practices for Cross Bore Risk Reduction.
and,
Full Introductory
Leading Practices Presentation.
Additionally and NOW available, CBSA has developed documents for Legacy projects:
- Chapters of the Leading Practices for Cross Bore Risk Reduction specifically addresses Legacy cross bores, including:
- Outline of Risk Reduction Tasks
- Legacy Risk Determination
- Quality Control
- Data Use Across the Enterprise
- Scoping for Cross Bore Risk Reduction Inspections
- Robotic Mainline and Launched Lateral CCTV Inspections
-
Locating and Tracking Field Work
Also
available to compliment the above "Leading Practices for
Cross Bore Risk
Reduction":
Sample Contrct for CBSA Legacy Inspection Contracts
Since at least 1999 elimination of cross bores from existing and new
construction have become a growing priority for operators of natural gas
distribution lines.
In 1999, sewer authorities complained that newly constructed sewer lines were being
damaged when gas lines were installed. Gas installers complained that sewers
were not located.
Owners of gas distribution lines complained that sewers were not marked.
Click here to see
Kentucky PSC vs. LG&E & Goshen Utilities, February 9, 1999 ruling.
CCTV,
GPS, GIS Integration Project Slide Presentation, courtesy Cues, Inc.
-(2.9 Mb, PDF format)
WHAT IS TRENCHLESS
Since trenchless techniques such as HDD, horizontal directional drilling, percussive moles and plowing, have been widely used as well for several decades there are potentials for thousands of existing cross bores of sanitary/storm sewers by gas distribution lines and other utilities. Trenchless technologies (www.nastt.org) have the advantage of being minimally disruptive to the surface, yards, roads, driveways, traffic and trees.
HOW MANY CROSS BORES ARE EXPECTED TO BE FOUND AND /
OR ELIMINATED?
On a large legacy project, there has been as many as
430 cross bores found nearly 200 miles. Expected U.S. average is 0.4 cross
bores per mile of mainline.
Definition of Legacy Cross Bore
A cross bore that was created during prior construction activities.
Class 1 Cross Bore Illustration
Class 2 Cross Bore Illustration
Legacy Cross Bore Inspection Project
A project that has the focus to find and eliminate legacy cross bores.
Highlights on This Page:
- Legacy Flow Chart
Legacy Project Guidelines - Legacy Project Contract
- Kentucky PSC Ruling
- CCTV, GPS and GIS Integration - Slide Presentation