BRIERLEY
Creating Space Underground
IN DEPTH
SEPTEMBER 2019


AUGUST 8 - LAUNCH DAY FOR FITZSIMONS STORMWATER OUTFALL TUNNEL
Aurora, CO

Brierley Associates teamed with the pipeline designer Carollo for this important asset construction program that involves over 10,000-ft of storm sewer pipe with diameters ranging from 54-in to 94-inches. Brierley Associates developed the subsurface characterization program and the Geotechnical Baseline Report. Work Package #1 will be completed by BT Construction using a 51-inch diameter Akkerman MTBM to tunnel beneath East Colfax Ave, a major thoroughfare. This reach employs an innovative strategy to complete two bores from one 30-ft diameter by 30-ft deep launch shaft.



I-35W STORMWATER STORAGE FACILITY- MINNEAPOLIS, MN
Tom Pullen, MSCE, Geotechnical Engineer

Wet weather events in Minneapolis have at times created surcharging of the existing stormwater tunnels to the point where manhole lids are blown off by water force and causing a hazard to I-35W travelers. Recognizing the need to mitigate these occurrences, Minnesota DOT went through a series of preliminary assessments. In 2017, the team of Brierley Associates, Barr Engineering and TKDA was selected by MnDOT to design a subsurface stormwater storage facility along I-35W south of Minneapolis, that will also provide flood relief of an existing low area near 42nd street.
 
The final design is comprised of six 45-ft diameter by 90-ft deep somewhat circular interconnected cells to provide over 4.5 million gallons of storage. Given the limited space along I-35W, the cells will be constructed using diaphragm wall methodology.
Brierley Associates is the Engineer-of-Record for the underground design components including the six interconnected diaphragm wall cells.
 
Construction is scheduled to commence in 2020 and will be executed through MnDOT Construction Manager General Contractor (CMGC) project delivery.  During construction a monitoring program will be utilized to monitor in near real-time groundwater, movement, and stresses during construction and throughout the life of the structure.
 
Click here for a video rendering of the project (Courtesy of Barr Engineering).

BASSETT CREEK TUNNEL - MINNEAPOLIS, MN
Kurt Breitenbucher, Geotechnical Engineer



The Bassett Creek Tunnel conveys stormwater beneath downtown Minneapolis and ultimately discharges to the Mississippi River. With depth of cover ranging from 12- to 20-ft, this 1.7-mile long, 11-ft by 11-ft, double box, cast in-place-concrete tunnel is generally within fill, but in some areas the haunches approach the edge of the weakly cemented St. Peter Sandstone where the alignment adjoins a buried river valley.  Brierley Associates was retained by the City of Minneapolis under our Consultant Pool Project Delivery Agreement to assess 2,000-ft of the tunnel to develop an understanding of how it would react to the loading imposed by the planned Southwest Light Rail Expansion, tail track for the Northstar Line.
 
Our services were initially focused on record drawing assessment, field measurements and observation. The collected data allowed Brierley to utilize Midas GTS to model tunnel reactions when loads were imposed by passing trains. Once the data was in hand, we evaluated the dynamic loading and found the tunnel can adequately withstand future train loads. However, Brierley's understanding of the subsurface conditions led to a differential settlement analysis, which resulted in a ground modification design to mitigate the potential tunnel deflection.
 
Construction of the Southwest Light Rail is now underway, and Brierley is serving as the City of Minneapolis' Tunnel Representative. During construction, monitoring will include: visual inspection; survey of surface monitoring points and tunnel crack gauges. Installed across the tunnel shear keys, the crack gauges are in arrays of 6, one on each wall of both barrels, and one on each barrel crown. Brierley will review and assess the instrumentation data, keep the City informed of tunnel performance and make periodic site visits for the duration of work near the Bassett Creek Tunnel.



BREAKTHROUGHS IN TUNNELING SHORT COURSE
Denver, CO - September 9-11, 2019

  
Join the tunnel industry in congratulating the winner of the 2019 Tunnel Achievement Award - Ohio Canal Interceptor  Tunnel team at the  12th Annual Breakthroughs in Tunneling Short Course.

Owner:
City of Akron 
Contractor: 
Kenny Construction - a Granite Company, partnered with Obayashi 
Design Team: 
DLZ (lead design), McMillen Jacobs (underground horizontal/tunnels), COWI (shafts), GPD 
Construction Management:
Parsons, Welty 
Major Subcontractors:
Brierley Associates provided Construction Engineering Design to Kenny and Schnabel Foundation  (ground improvement), Northstar (shafts),  Turn-Key Tunneling (connector tunnel),  T-Lucky (grouting)    
Suppliers:
Robbins (TBM with VMT guidance system), CSI (segments), Condat (tailshield grease), Medina Concrete (shotcrete)

All attendees are invited to the Tunnel Achievement Awards Reception , Tuesday, September 10th, from 5:15 - 7:00 PM.

Learn more  

ROCKY MOUNTAIN WATER CONFERENCE
Keystone, CO September 8-11, 2019

The Rocky Mountain Water Conference is a joint meeting of the Rocky Mountain Section of the American Water Works Association (RMSAWWA) and Rocky Mountain Water Environment Association (RMWEA).  More than 120 exhibitor booths and numerous technical sessions and learning opportunities are scheduled including Brierley's Sarah Myers and Kyle Friedman who will be presenting Tunnel Engineering for the North Greeley Sewer Line.



NAAMLP | PA AMR | NASLR 2019 CONFERENCE
Pittsburgh, PA September 8-11, 2019

This year's National Association of Abandoned Mine Land Program's (NAAMLP) 41st Annual Conference will be conducted jointly with the Pennsylvania Abandoned Mine Reclamation (PA AMR) and the National Association of State Land Reclamationists' (NASLR) Annual Conferences. These three organizations share common goals and interests focused on successful reclamation and environmental restoration of previously and currently mined sites. The multi-organization platform will provide conference attendees a broad range of mining and reclamation topics and issues as well as increased networking opportunities. The conference will be held at the Wyndham Grand Downtown Pittsburgh Hotel, September 8-11, 2019.

Brierley's Dr. Mohamed Gamal and Dave Hibbard will be attending.  Stop by and visit them at Booth #26.



ASSOCIATION OF STATE DAM SAFETY OFFICIALS (ASDSO)
Orlando, FL September 8-12, 2019

This year's event at the Loews Royal Pacific Resort will bring together nearly 1,000 dam and levee safety professionals from across the country and globally for a week of networking, knowledge transfer, and community building. With 2 general sessions, 38 concurrent sessions packed with over 115 presentations to choose from, and over 100 exhibitors. Dam Safety 2019 is the showcase event of the year for dam and levee safety professionals.  
 
Brierley's Steve Kuehr, and Ryan Schoolmeesters, Dam Safety Engineer, CO Division of Water Resources will be presenting Use of a Geosynthetic Clay Liner to Rehabilitate the Lower Chinns Dam, Clear Creek County, on Monday September 9, 2019.


COLORADO ASSOCIATION OF STORMWATER AND FLOODPLAIN MANAGERS (CASFM)
Crested Butte, CO September 24-27, 2019

The  2019 Colorado Association of Stormwater and Floodplain Managers (CASFM) Annual Conference  will be held   September 24-27, 2019   in beautiful Crested Butte at the  Crested Butte Mountain Resort. T he Rocky Mountain Region's preeminent conference for unparalleled workshops, presentations, networking and learning opportunities with Stormwater, Floodplain, and Water Quality professionals from across the Rocky Mountain Region.

 

2019 CUTTING EDGE CONFERENCE - ADVANCES IN TUNNELING TECHNOLOGY
Miami, FL November 18-20, 2019

This November the eighth annual Cutting Edge Conference convenes in Miami, Florida to examine the latest advances in tunneling technology and construction methods and how they can be harnessed to successfully deliver the nation's major upcoming underground projects. The Cutting Edge Conference features a tailored, high-end, single-track program of subject-specific presentations that focus on innovation and practical experience, as well as extended in-depth industry discussion sessions, which have become a trademark of this conference.


TUNNEL BORING MACHINES IN DIFFICULT GROUNDS  4TH INTERNATIONAL CONFERENCE
Golden, CO November 14-15, 2019

TBM DiGs is an international conference series that provides a specialized technological forum to discuss and exchange knowledge related to TBM works in difficult ground. TBM DiGs will be held November 14-15, 2019  and is jointly organized by several universities and organizations involved in the tunneling industry.
 

SAVE THE DATE!
ENGINEERING GEOLOGY FOR SUBSURFACE WORKS
Golden, CO November 21, 2019





Brierley Associates, Dr. Mole, Inc and the Association of Environmental & Engineering Geologists (AEG) and the Colorado School of Mines presents....Engineering Geology  for Subsurface Works.

Join us November 21, 2019 at 6:00 PM in the Colorado School of Mines - Student Center Ballroom as: 
  •  Mr. Sean Sundermann presents Engineering Geology and Geohazard Characterization for Cross Country Pipelines;
  • Dr. Gary Brierley presents Engineering Geology For Tunneling Projects; and,
  • Dr. Mark Diederichs presents Engineering Geology and Observational Design in the Andes: The Good, the Bad and the Ugly.


SAVE THE DATE!  RISK MANAGEMENT IN UNDERGROUND CONSTRUCTION
MARCH 10-11, 2020

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 this coming March.
 
Risk management is an important issue when it comes to successfully completing modern tunnel and other large scale underground construction projects. Without the open discussion of the potential risks between all parties and an understanding of these risks in advance, projects can become involved in disputes that benefit no one.
 
Join leading stakeholders from all facets of the industry, including: contractors, owners, consultants, insurance companies, vendors, and law firms for a unique two-day event that fosters learning through open discussions and expert-led presentations.
  


BRIERLEY ANNOUNCES ITS NEW OFFICE IN NORTHBOROUGH, MA

Located at 44 Bearfoot Rd., Suite 100B, Northborough, MA 01532 is our second Boston area office and is managed by Dr. Don Wotring. With more than 20-years of domestic and international experience as a Project Manager and Tunnel Engineer, Dr. Wotring is a welcome addition to Brierley Associates. Don's experience includes tunnels and underground structures for transportation and water/wastewater facilities, as well as other geotechnical and structural underground construction projects. Dr. Wotring can be reached at 508.919.8651 or dwotring@brierleyassociates.com.
 
Jeffery Derosier, CADD Manager, is also located in our Northborough office. Jeff has more than 30-years of progressive CADD and complex design package preparation for surface and underground heavy civil projects. Additionally, Geologist James Duffy has relocated from our office in Cambridge, MA to Northborough. 


BRIERLEY'S NEW ABANDONED MINE LANDS (AML) OFFICE

To support our ongoing Abandoned Mine Lands work in Wyoming and upcoming opportunities, Brierley Associates has established a new office at 1482 Commerce Drive, Unit A, Laramie, WY 82070. Joel James, who recently joined Brierley has relocated to operate that office. Mr. James has over ten years of combined experience as a project manager, superintendent, civil engineer, estimator, and operator. He specializes in foundation design, hydraulic engineering, tunnel design, slope stabilization and construction management.  

Joel may be contacted at 307.343.1149 or jjames@brierleyassociates.com. 


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.



     
                  Creating Space Underground - Coast to Coast