Underground Construction - December 2017 - 75
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UNDERSTANDING THE ISSUE
The installation of pipelines and conduits by
horizontal directional drilling (HDD) can increase
the likelihood of damaging crossing utilities.
Directional drilling has substantial performance and
economic advantages, but requires cautious steps
to locate and protect existing infrastructure. While
one-call services and some additional research by
someone with utility experience can help avoid most
conflicts, the sewer service lateral remains to be the
most challenging to address (especially for natural
gas providers).
It's a known fact that natural gas cross bores
through sewer laterals can blow up houses, and
even telecommunications drilling has resulted in
home explosions when also crossing gas lines.
The sewer lateral, being a gravity drain, is a direct
conduit to the house with the ability to allow gases
to enter the home. The location of these laterals is
often poorly documented considering non-permitted
additions and often follow illogical alignments.
There is no indication that sewer service laterals
have been compromised (drilled through). They
usually do not have tracer wire, are typically
constructed of non-locatable material and, more
commonly than not, are not documented. Common
HDD practice includes identifying the location
of crossing utilities and pot holing can provide a
physical observation that the existing utility was not
damaged. However, inaccurate sewer lateral locates
are commonplace.
BEST PRACTICES
The HDD industry has made great improvement
with best practices in terms of accounting for
these little meandering nightmares. Sewer service
inspection companies equipped with 'lateral-launch'
technology have not only the ability to inspect and
locate the laterals, but since they launch from the
mainline, they can also account for every connection
in the bore path, which is often missed when judging
solely from surface evidence (counting houses or
cleanouts). There are always more connections
than what the surface may indicate. Best practices
tell us to consider lateral launch to locate the laterals
before drilling.
Lateral launching is only half the battle. To
substantiate the inspection effort, fulfill the
inspection in terms of best practice and ultimately
protect your process, there needs to be a record
keeping element associated with the inspection
effort. Proof that best practices were followed, and
all potential crossings were not damaged, must be
documented to deliver a guarantee that people and
property will not be in danger.
UTILIZING GPS
Records often include bore sheets, written field
logs, and sometimes maps, which can shed a
lot of light in terms of "look before you drill," but
one particular record that could offer security is
a GPS point capture. GPS enables remarkable
information collection with very little effort and cost.
Lateral launch technology can include subsurface
transmitters that enable surface locating. Visually
locating the point of connection (with depths)
and changes in alignment with GPS as the lateral
crosses the bore path provides excellent intelligence.
If the bore path was challenged, this data could
support identifying a new bore path (accounting for
the tolerance of the depth accuracy).
Furthermore, GPS data associate any given lateral
with an address, which improves risk tracking and
provides a time stamp which supports the event
timeline. GPS is also being utilized beyond the
alignment of the lateral in terms of a spatial record,
but also to provide a tracking element, such as a
GPS point capture at the center of every private
property immediately prior to lateral locate points.
This ties the subsurface alignment capture with the
understood supporting structure which the lateral
services. This helps in the QA/QC effort to associate
the inspection and location of subsurface laterals
with a surface structure in the event there are more
connections identified than what may be apparent
on the surface (a condition that occurs far more
frequently than imagined).
GPS data, with a consistent methodology for
alpha-numeric identifiers (and description terms),
enables both tracking and searchability in a vast
data set (city-wide). For example, perhaps the first
point capture is the property with a special numeric
sequence. That number is consistently known as
the property ID, followed by a subsequent series of
lateral alignment shots. Then the description can be
used for the work order or address with alignment
features, such as bends or branch connections.
When locating from lateral launch inspections, the
CCTV operator must make a physical effort to locate
each point of interest, and add a GPS point from a
sub-meter hand-held, resulting in a minimal amount
of additional time to the overall effort (well worth the
data). Having a GPS depository (routine practice
for adding points) improves continually populating
this data, which can not only improve searching,
but can also substantiate that best practices were
followed with all potential laterals accounted. GPS
can eliminate errors related to disassociating lateral
connections with structures, or addresses. This data
also will help with the post-HDD inspection effort,
and ultimately contribute to reducing the long-term
legacy effort related to cross bores.
http://www.nassco.org
Underground Construction - December 2017
Table of Contents for the Digital Edition of Underground Construction - December 2017
Underground Construction - December 2017
Contents
Editor’s Log
Newsline
Washington Watch
Unique Undergrounding Program Reduces Outages, Maximizes Response Time
Under the River, Over the Mountain
Tips for Better Accuracy in Utility Plowing
Importance of Stormwater Drainage
HDD Drill Pipe Selection Guide
Pipeline Projects
It’s Showtime
UCT Overview
Rehabzone, Emerging Technologies
Vic Weston Named 2018 MVP
UCT Partner Courses
Educational Program
Exhibitor Showcase
New Orleans
Registration
Rehab News and Product Focus
Nassco Tech Tips
Business
New Products
New Products
Equipment Spotlight
Equipment Spotlight
Business Cards
Calendar of Events
Sales Reps
Ad Index
Underground Construction - December 2017 - Underground Construction - December 2017
Underground Construction - December 2017 - IFC
Underground Construction - December 2017 - Contents
Underground Construction - December 2017 - Editor’s Log
Underground Construction - December 2017 - 3
Underground Construction - December 2017 - 4
Underground Construction - December 2017 - Newsline
Underground Construction - December 2017 - 6
Underground Construction - December 2017 - 7
Underground Construction - December 2017 - Washington Watch
Underground Construction - December 2017 - 9
Underground Construction - December 2017 - Unique Undergrounding Program Reduces Outages, Maximizes Response Time
Underground Construction - December 2017 - 11
Underground Construction - December 2017 - 12
Underground Construction - December 2017 - 13
Underground Construction - December 2017 - Under the River, Over the Mountain
Underground Construction - December 2017 - 15
Underground Construction - December 2017 - 16
Underground Construction - December 2017 - 17
Underground Construction - December 2017 - Tips for Better Accuracy in Utility Plowing
Underground Construction - December 2017 - 19
Underground Construction - December 2017 - 20
Underground Construction - December 2017 - 21
Underground Construction - December 2017 - Importance of Stormwater Drainage
Underground Construction - December 2017 - 23
Underground Construction - December 2017 - 24
Underground Construction - December 2017 - 25
Underground Construction - December 2017 - HDD Drill Pipe Selection Guide
Underground Construction - December 2017 - 27
Underground Construction - December 2017 - 28
Underground Construction - December 2017 - Pipeline Projects
Underground Construction - December 2017 - 30
Underground Construction - December 2017 - It’s Showtime
Underground Construction - December 2017 - UCT Overview
Underground Construction - December 2017 - 33
Underground Construction - December 2017 - Rehabzone, Emerging Technologies
Underground Construction - December 2017 - Vic Weston Named 2018 MVP
Underground Construction - December 2017 - UCT Partner Courses
Underground Construction - December 2017 - 37
Underground Construction - December 2017 - Educational Program
Underground Construction - December 2017 - 39
Underground Construction - December 2017 - 40
Underground Construction - December 2017 - 41
Underground Construction - December 2017 - 42
Underground Construction - December 2017 - 43
Underground Construction - December 2017 - 44
Underground Construction - December 2017 - 45
Underground Construction - December 2017 - 46
Underground Construction - December 2017 - 47
Underground Construction - December 2017 - 48
Underground Construction - December 2017 - 49
Underground Construction - December 2017 - 50
Underground Construction - December 2017 - 51
Underground Construction - December 2017 - Exhibitor Showcase
Underground Construction - December 2017 - 53
Underground Construction - December 2017 - 54
Underground Construction - December 2017 - 55
Underground Construction - December 2017 - 56
Underground Construction - December 2017 - 57
Underground Construction - December 2017 - 58
Underground Construction - December 2017 - 59
Underground Construction - December 2017 - New Orleans
Underground Construction - December 2017 - Registration
Underground Construction - December 2017 - 62
Underground Construction - December 2017 - 63
Underground Construction - December 2017 - 64
Underground Construction - December 2017 - 65
Underground Construction - December 2017 - 66
Underground Construction - December 2017 - 67
Underground Construction - December 2017 - 68
Underground Construction - December 2017 - 69
Underground Construction - December 2017 - 70
Underground Construction - December 2017 - Rehab News and Product Focus
Underground Construction - December 2017 - 72
Underground Construction - December 2017 - 73
Underground Construction - December 2017 - Nassco Tech Tips
Underground Construction - December 2017 - 75
Underground Construction - December 2017 - Business
Underground Construction - December 2017 - 77
Underground Construction - December 2017 - New Products
Underground Construction - December 2017 - 79
Underground Construction - December 2017 - 80
Underground Construction - December 2017 - 81
Underground Construction - December 2017 - Equipment Spotlight
Underground Construction - December 2017 - Business Cards
Underground Construction - December 2017 - 84
Underground Construction - December 2017 - 85
Underground Construction - December 2017 - 86
Underground Construction - December 2017 - 87
Underground Construction - December 2017 - Ad Index
Underground Construction - December 2017 - IBC
Underground Construction - December 2017 - BC
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