IN DEPTH
March 2020
Retirement Congratulations to Our Friend Gregg Sherry
Gregg Sherry
It has been my distinct privilege to have Gregg Sherry as a mentor for the past 20 years. He, along with Gary Brierley, Alan Howard and Jim Smith, defined the purpose and direction of Brierley Associates. As we transition into our third generation of ownership, Brierley continues to approach the challenges of "Creating Space Underground" as they have and taught us to do. It is an evidenced-based, observational approach to design, well-versed and expounded upon by those who preceded them but who, from time to time, are forgotten in our industry. 
 
Thanks to true leaders like Gregg, Brierley Associates' culture remains committed to focusing on constructability, efficiency and practicality for our clients. Gregg and our founding partners worked hard to ensure that the services we provide are built on a keen understanding of subsurface conditions, site-specific constraints, and the risks associated with the construction of tunnels, underground facilities, and heavy civil infrastructure projects.
 
I continue to be indebted to Gregg for the support that he has provided to me since 2001. He did not have to do what he did for me. His generosity and caring nature remain germane to the Brierley culture and is one of the reasons why we truly consider each other family.
 
Gregg will continue to provide his expertise to us from time to time, but whatever his retirement brings, we wish him health and happiness and thank him for everything he's done for the Brierley family.

AJ McGinn
Deep Foundations Pose Challenges in Tight Downtown Areas
Brierley's trestle designs help builders construct deep excavations
 
By David J. Berti, Senior Consultant
 
Construction in dense urban areas like San Francisco and Los Angeles pose unique challenges for shoring and excavation. Urban center constraints like walkways, roads, utilities, adjoining buildings, and subways are used by thousands of people and create major challenges to basement excavation means and methods. Because of the density of structures, underground space is needed for building systems, parking, and business. Well-designed trestles are often required for supporting equipment that installs and removes the shoring, excavates the ground, and places concrete. Since 2006 Brierley Associates has designed equipment trestles for 10 buildings in downtown San Francisco, and Los Angeles, including Trinity IV in San Francisco. The 738,000 SF Trinity IV residential complex located at 8 th and Market Streets has a 67-ft deep basement which required a crane trestle designed by Brierley
 
March 10-11, 2020 • Houston, Tx
See you at the Risk Management Conference!
Brierley Associates and Dr. Mole, Inc. are Main Event Gold Sponsors of the 2020 edition of Risk Management in Underground Construction to be held in Houston, TX.

Tuesday March 10, Gary Brierley will speak on Planning for Project Success . On Wednesday, Nick Strater will hold a session on Geotechnical Risk Assessment.

Hope to see you there!
Outstanding Trenchless Paper Award
Assessment of Soil and Bedrock Abrasivity fo HDD Projects
Brierley's Nick Strater presented the paper for NASTT No-Dig 2019 Conference
Co-Authored by Danny Crumpton, Inrock
Brian Dorwart and Jim Williams, Brierley Associates

Nick's presentation explored excessive tool and equipment wear associated with abrasive soil and bedrock conditions. Understanding the factors that cause abrasion and identifying their presence through a geotechnical investigation can help to avoid unforeseen costs and schedule delays.

Presentations and papers are reviewed by an award committee in combination with feedback received on the speaker evaluation form completed by attendees.

Some of the comments on Nick's paper included: " Really interesting talk since quantitatively predicting abrasion does not have a well-established procedure." and "Nick is an all-star in the industry. I'm amazed at his analytical ability."

We couldn't agree more. Award recognition will be during No-Dig 2020 in Denver and the paper is available from the NASTT website.
Look for these topics presented by Brierley staff at No-Dig 2020, April 5-9, Denver, Colorado
Going to No-Dig 2020 in Denver? Look for talks by our trenchless technology specialists, or check in with us at Booth No. 1111 in the exhibit hall. For more information or to register, click here.

Geotechnical Baseline Reports for HDD - When, Why, and How
Presented by Nick Strater, Trenchless Practice Leader, Brierley Associates, and Michelle Macauley, Macauley Trenchless
Geotechnical Baseline Reports for Horizontal Directional Drilling projects are becoming more common. Writing GBRs for a HDD project presents unique challenges regarding what ground conditions to baseline, how to craft baseline statements, and how to convey this information to a contractor pool unfamiliar with GBRs. This paper addresses these challenges.
 
Small HDD and a GBR; An Example of How This May Benefit the Builder and Owner
Presented by Kurt Breitenbucher, Geotechnical Engineer
This presentation will consider a project which included approximately 2,000-ft of 72-in microtunneling, shafts and an HDD siphon installation. Since the project was already using a GBR as a risk allocation and ground behavior communicative tool for the tunneling and shafts, it seemed prudent to include a difficult HDD crossing with complex geometries and geologies into the GBR. The HDD component of the project was completed and anticipated ground behaviors were encountered as well as unanticipated conditions such as shallow bedrock. This paper will share how the GBR, in this case, was beneficial to all parties involved with the HDD portion of the project.
 
Design Challenges and Mitigating Risk for Eight Trenchless Crossings
Presented by Melody Clay, Civil Geotechnical Engineer
Successful risk management identifies the risks associated with design and construction, develops options to treat the risks with the goal of meeting cost and schedule targets, and assigns risks to parties best suited to handle them. The City of Thornton Colorado has elected to install two sections of 48-inch pipeline totaling approximately 36,700 linear feet including eight tunnels. This paper will present the mitigation strategies for risk associated with the trenchless crossings throughout the design of the project. 
 
Bedrock Characterization for Horizontal Directional Drilling Projects
Presented by Nick Strater, Trenchless Practice Leader and Brian Dorwart, Senior Consultant
Horizontal Directional Drilling (HDD) installations are becoming increasingly common in bedrock, even in in igneous and metamorphic lithologies. Compared to soil, bedrock installations may be technically challenging, require more expensive tooling, and increased pump rates. Drilling in bedrock may also require reduced drilling and reaming rates, and increased tool wear.  Consequently, the risk of adverse schedule impacts and cost overruns increases significantly when adequate bedrock characterization is not completed prior to design. This paper presents recommended minimum bedrock exploration and testing measures, and suggested characterization methods for HDD installations
 
FRP Goes Deep and Far
Presented by Thomas Pullen, Geotechnical Engineer, & Firat Sever, QuakeWrap, Inc.
The I-35 stormwater tunnel in Minnesota has been sustaining structural defects due to high stresses from surcharge conditions and high soil pressure. While grouting and crack sealing has been effective, a short segment along a 12-ft diameter stretch required fully-structural solution, and was lined with a patent pending FRP system. A proprietary fiber reinforced polymer (FRP) system (StifPipe®) with a 3D core layer was selected by the project engineer for this point repair with high loads and limited access (4 by 4 ft. manhole half of a mile away). Another challenge for the project team was to complete installation in a short time period to control flow bypass pumping cost. The project was completed with success without any significant issues encountered at the project site. The I-35 tunnel repair project marks a record as the deepest application of an FRP system for fully-structural tunnel rehabilitation.
Brierley Associates Gets Down in the Mud at Pacific Water 2020
Brierley Associate's Don Painter and Alan Howard attended Pacific Water together with over 800 other water, stormwater and wastewater professionals working in Hawai'i and the Pacific. Brierley helped sponsor the popular annual conference, including sponsoring and participating in a community service work day that involved cultural learning and hands-on work tending to a traditional taro ("kalo") patch, or "lo'i."

Farm owners Dean and Michele Wilhelm use taro farming to mentor young people facing challenging circumstances. This provides opportunities weave local history and culture into life lessons and cultural pride. Volunteers work with regular farm workers to plant kalo, pull weeds and harvest. 

Honolulu Magazine has more about the Wilhelm's mission and volunteer opportunities:

 
Don and Alan represented Pacific Water "Kupuna" (elders) working alongside mostly local AWWA and HWEA Young Professionals who clearly held the advantage of younger knees, hips and backs pulling weeds in knee-deep mud and waist-deep water. Volunteers and farm workers "talked story" about their personal lives and why they chose to spend their Saturday sharing in this experience.
Don Painter and Alan Howard far right
Our Core Purpose
Brierley Associates delivers intrinsic, recognizable value to our owner, A/E firm, and contractor clients by focusing on constructability, efficiency and practicality. Our geotechnical and structural design and consulting services are founded on a keen understanding of our clients' needs, subsurface conditions, site-specific constraints, and the risks associated with the construction of tunnels, underground facilities and heavy civil infrastructure projects.