Underground Construction - September 2021 - 8

NEWSLINE LATEST INDUSTRY DEVELOPMENTS
NTSB: Crew Safety Failure
Led to San Francisco
Natural Gas Fire
An investigation by the National Transportation
Safety Board (NTSB) determined that an excavation
crew from Kilford Engineering Inc. failed to follow
safety procedures which led to a 2019 natural gas
release and fi re in San Francisco.
The NTSB issued Pipeline Accident Report 21-02
in August, detailing its investigation of the February
2019, natural gas release and fi re in San Francisco.
NTSB investigators determined the failure of the
excavation crew to follow safe excavation practices
within the area surrounding Pacifi c Gas & Electric
Company's 4-inch natural gas distribution pipeline,
caused the excavation backhoe to strike a pipeline
branch connection.
The accident occurred during excavation for
fi beroptic conduit in a residential neighborhood in
San Francisco. There were no injuries or fatalities.
About 100 people were evacuated from the area.
The crew conducted mechanical excavation
too close to the pipeline without taking the proper
precautions fi rst to make sure the area was safe to
execute the dig, said Robert Hall, director of the
NTSB's Offi ce of Railroad, Pipeline and Hazardous
Materials Investigations.
The agency issued one safety recommendation
to San Francisco emergency response agencies and
two safety recommendations to PG&E as a result of
the investigation. The recommendations address
PG&E's data integration gaps and insuffi cient joint
planning between PG&E and San Francisco emergency
response agencies.
CGA Releases Newest Edition
of Best Practices Guide
The Common Ground Alliance (CGA) has released
the 18th edition of its Best Practices Guide to protect
vital underground infrastructure and improve
safety during excavation activities conducted in the
vicinity of existing underground facilities.
The latest guide includes more than 160 Best
Practices established by a consensus of CGA's 16
stakeholder groups that provide damage prevention
recommendations based on practices currently
being utilized. They are organized by six key industry
Michels Canada Completes Canada's Longest HDD Installation
Michels Canada extended the limits of
trenchless construction in Canada by using
horizontal directional drilling to complete a
11,614-foot crossing in Burlington, Ontario,
under the Hidden Lake Golf Club.
The Hidden Lake HDD is the longest
The Hidden Lake HDD installation was completed in
three sections over 40 hours. (Photo: Michels Canada)
successful HDD installation in Canada to
date, surpassing the previous record of
about 7,200 feet, also set by Michels Canada.
The installation was part of a project to
replace about 39 miles of the Sarnia Products Pipeline between the Waterdown pump station in
rural Hamilton and the storage facility in Toronto's North York area.
The project used a 12-inch steel pipe installed to a maximum depth of 230 feet below the
surface and pulled into place in three sections over a 40-hour period. The crossing spanned along
a right-of-way that passes under the Hidden Lake Golf Club and a wetland in the environmentally
sensitive Southern Ontario region.
" The completion of record-length trenchless projects like this one demonstrate our capabilities
for safe, environmentally sound ways of constructing new or replacing existing utility lines, " said
Gary Ziehr, vice president of energy at Michels Canada. " When HDD and other trenchless methods
are used to complement traditional open cut utility construction methods, we are able to support
our clients in safely delivering needed energy supplies to their customers. "
Due to the length of the crossing, Michels Canada deployed a rig on each end of the alignment.
Operators used the rigs to drill toward one other and then used gyroscopic survey and steering
technology to complete the intersection of the two bore holes. The alignment follows the right-ofway
of the original Sarnia pipeline, so the Michels Canada team had to carefully navigate the fi ve
horizontal curves along the alignment.
8 SEPTEMBER 2021 | UCONonline.com
areas to provide guidance along the entire safe
digging process: One Call Center, Facility Owner,
Excavator, Locator, Project Owner and Designer.
The guide is developed by the CGA Best
Practices Committee, which oversees the review
and approval of new Best Practices and updates to
existing practices. Potential practices are proposed
by CGA members and damage prevention stakeholders
as advancements in technology, changes
in policy and other factors create opportunities to
further improve the safe digging process.
The newly released Best Practices Guide 18.0
includes two new Best Practices and addition to
Appendix B: Uniform Color Code and Marking
Guidelines that refl ect recent technology
advancements being utilized in damage prevention:
The Best Practices Guide 18.0 is available at
www.commongroundalliance.com.
Georgia Wins Fresh Ruling in
Water War with Florida, Alabama
A judge has ruled that a federal agency doesn't have
to revise its plans for how it operates dams along
the Chattahoochee and Flint rivers, another win for
Georgia in its struggles with Florida and Alabama
over the water that fl ows into the Apalachicola River.
Environmental groups and the state of Alabama
had sued the U.S. Army Corps of Engineers in 2017,
saying the agency's plans held too much water
in reservoirs in the Apalachicola-ChattahoocheeFlint
basin and that it should release more for
hydropower and wildlife.
It's the second win for Georgia, after the U.S.
Supreme Court rejected Florida's eff ort this spring
to cap how much water Georgia could use.
Lake Lanier northeast of Atlanta and the
Chattahoochee River supply drinking water to
much of metro Atlanta.
" We will continue to be good stewards of
our water resources, and we are proud to have
obtained a positive resolution on behalf of all
Georgians, " Gov. Brian Kemp and Attorney General
Chris Carr said in a joint statement.
Some or all of the plaintiff s could appeal to the
11th U.S. Circuit Court of Appeals.
Louisiana Receiving Water
System Applications for Grants
Louisiana has received nearly 200 applications so
far from community water systems seeking a share
of $300 million in federal coronavirus aid that state
lawmakers have earmarked for improvements to
public water and sewage systems.
http://www.commongroundalliance.com http://www.UCONonline.com

Underground Construction - September 2021

Table of Contents for the Digital Edition of Underground Construction - September 2021

Contents
Underground Construction - September 2021 - Cover1
Underground Construction - September 2021 - Cover2
Underground Construction - September 2021 - Contents
Underground Construction - September 2021 - 4
Underground Construction - September 2021 - 5
Underground Construction - September 2021 - 6
Underground Construction - September 2021 - 7
Underground Construction - September 2021 - 8
Underground Construction - September 2021 - 9
Underground Construction - September 2021 - 10
Underground Construction - September 2021 - 11
Underground Construction - September 2021 - 12
Underground Construction - September 2021 - 13
Underground Construction - September 2021 - 14
Underground Construction - September 2021 - 15
Underground Construction - September 2021 - 16
Underground Construction - September 2021 - 17
Underground Construction - September 2021 - 18
Underground Construction - September 2021 - 19
Underground Construction - September 2021 - 20
Underground Construction - September 2021 - 21
Underground Construction - September 2021 - 22
Underground Construction - September 2021 - 23
Underground Construction - September 2021 - 24
Underground Construction - September 2021 - 25
Underground Construction - September 2021 - 26
Underground Construction - September 2021 - 27
Underground Construction - September 2021 - 28
Underground Construction - September 2021 - 29
Underground Construction - September 2021 - 30
Underground Construction - September 2021 - 31
Underground Construction - September 2021 - 32
Underground Construction - September 2021 - 33
Underground Construction - September 2021 - 34
Underground Construction - September 2021 - 35
Underground Construction - September 2021 - 36
Underground Construction - September 2021 - 37
Underground Construction - September 2021 - 38
Underground Construction - September 2021 - 39
Underground Construction - September 2021 - 40
Underground Construction - September 2021 - 41
Underground Construction - September 2021 - 42
Underground Construction - September 2021 - 43
Underground Construction - September 2021 - 44
Underground Construction - September 2021 - 45
Underground Construction - September 2021 - 46
Underground Construction - September 2021 - 47
Underground Construction - September 2021 - 48
Underground Construction - September 2021 - 49
Underground Construction - September 2021 - 50
Underground Construction - September 2021 - Cover3
Underground Construction - September 2021 - Cover4
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