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Ameren Illinois Rivers transmission line river crossings
Interstate 74 – redesign services
South Florida Water Management District – headquarters building
Illinois Air National Guard facility design
Indianapolis International Airport services
Monroe County Airport
CapX2020 Mississippi River T-Line Crossing
Ameren Illinois Rivers Project
Indianapolis International Airport - Taxiway B rehabilitation
Midwest power-generation station projects
BNSF's Memphis Intermodal Facility expansion
DuPage National Technology Park Cyber Continuity Center
Macon County Beltway
Town Branch sewer rehabilitation
Missouri River Freight Assessment
P&L Railway Bridge design and construction
Muscatatuck Urban Training Center
Interstate 64 Missouri River Bridge - new bridge design
Springfield Airport Authority contract advisory services
Li Ka Shing Knowledge Institute
Lake County Judicial Center – commissioning services
Duke University – Levine Science Research Center
Charlotte County Airport design-build project
Caterpillar Inc. industrial projects
DHA BUILDER Asset Management System
BNSF Railway – Canadian River bridge design
Indiana Hoosier SAFE-T – Emergency Communications System
Fairfield and Gilmer Interchange Improvement
Illinois Tollway’s Cherry Valley interchange
Metropolitan St. Louis Sewer District – watershed mapping
USACE hydrographic surveys
Muscatine Joint Readiness Center
Tri-State Tollway reconstruction
University of Illinois at Springfield
SSM Health Good Samaritan Hospital
East Carolina University M&V audit
USF Juniper-Poplar Residence Hall
Abraham Lincoln Capital Airport - architectural design services
Sarasota Bradenton International Airport
Eastern Illinois University Renewable Energy Center
CWLP’s Dallman 4 – power-generating unit
BNSF bridge replacement over Des Moines River
City of New York – Emergency Radio Communications System
Kentucky Riverport Improvement
City of Rockford – Multilane Roundabout
U.S. Army Corps of Engineers - Roads Acting as Dams
Combined Service and Maintenance Support (CSMS) Bridging Documents
Clark Bridge - design services
FEMA Technical Assistance Contract
The Horace Mann Cos. retro-commissioning
South Suburban Airport – land acquisition services
Waukegan National Airport
Bowman Field
Liquefied natural gas tank projects
Sangamon County guaranteed energy savings contract
Chicago Region Environmental and Transportation Efficiency Program
International Broadcasting Bureau – Kuwait transmitting station
Capitol Avenue Corridor Improvements
Fort Hood Pavement Condition Surveys and Management Plan Updates
Monarch-Chesterfield Levee flood-wall design
F-16 Engine Centralized Intermediate Repair Facility (CIRF)
Indiana State Route 641 Bypass design
Broward College – student affairs complex renovations
Zora Neale Hurston Building retro-commissioning
Pompano Beach Air Park
Sustainability paves way for Runway 2-20
Blue Grass Airport
Springfield Clinic Sixth Street expansion
Union Pacific Railroad - Global III Facility planning & design
U.S. Coast Guard - LORAN-C high-power transmitter stations
Outdoor Advertising Control Support Services
CWLP Spaulding Dam Spillway Gate Rehabilitation
Military Special Forces Centric Training Center design
Shiloh Readiness Center
Interstate 255 rehabilitation
Torrey Pines Molecular Research Center – commissioning services
Rohde Building retro-commissioning
DeKalb Taylor Municipal Airport – instrument landing system
Fermi National Accelerator Laboratory projects
BNSF Railway – Renton, Wash., railroad bridges replacement
International broadcasting stations
AT&T Reno, Nev., central office expansion
Raney Street relocation and extension
Lockport Lock and Canal Wall
Palm Beach Atlantic University
USF – central energy plant commissioning
Orange County Public Schools commissioning and retro-commissioning
Charlotte County Airport – general consultant services
Suffolk Construction Co.’s South Florida headquarters
Anacacho Wind Farm
Papalote Creek Wind Farm, Phases I and II
Alaska Railroad Corp.’s Northern Rail Extension
Interstate 57 interchange
Lock 22 extension feasibility study
Selfridge Munitions Facility
State of Florida Special Needs Shelters
Leesburg International Airport
Valkaria Airport improvements
USACE Alaska Railhead Facility
Centennial Bridge traffic study and rehabilitation
Memorial Physician Services medical office
Southern Illinois University at Edwardsville
Turlington Building
North Carolina Central University – building commissioning
University of Florida East Campus Data Center
University of North Florida Biological Sciences Building
Arcadia Municipal Airport
Naples Municipal Airport
Simmons Cancer Institute
Florida Hospital Energy Roadmap Phase 1
Springfield Clinic 1st Expansion
Emiquon Preserve Water Control Structure
National Precast Concrete Association – plant quality assurance audits
Memorial Center for Learning and Innovation
Tennessee Waterways Assessment Study
Southeast Iowa Regional Economic and Port Authority
Hillside Town Center development
Sandy Grove Middle School

Town Branch sewer rehabilitation

Springfield, Ill., like most cities founded in the 1800s, grew around its original and aging sewer system.  More than 100 years ago, two natural streams ran through the city, serving as an open sewer and eventually emptying into the Sangamon River.  As the city and the odor grew, these natural drainage channels were enclosed and one of them became the Town Branch Sewer.  The Town Branch Sewer District underlies the central portion of the city.  Through its collection system, it serves an area of approximately 1,800 acres.  The district contains some of the oldest sewers in the city — some dating as far back as 1865.  The majority of the sewers were constructed of brick and stone in arch or oval configurations.  Over the years, streets and buildings were built over the sewer.

Springfield city officials knew there were problems with the Town Branch Sewer, but they were not certain about the extent of its deterioration.  They chose Hanson to carry out the sizable task of finding the problems and bringing the sewer to a safe and usable level.  We looked at the sewer from a comprehensive system standpoint and determined the most effective solution.

Hanson’s initial involvement began with a condition survey of the Town Branch to document its size, condition and the location of all entering main sewers and lateral lines.  We also checked for structural integrity.  To perform this survey, a five-person crew received special training to work in the confined spaces encountered as they walked through and observed the sewer.  During the survey, we discovered severe failures, including collapsed walls and washouts of backfill in three locations. 

Hanson provided quick-response engineering services to expedite the repair of the failed sections.  We provided sketches and guidance on temporary bracing of walls to inhibit further collapse of the sewer and prepared plans for the needed repairs from within the sewer, avoiding an open-cut repair.  Hanson then contacted contractors capable of completing the repair work and solicited bids for the work.  After the contracts were awarded, Hanson provided construction observation and documented the contractor’s work while repairs were made.  The repairs were completed less than 30 days after the failures were first observed.

After the survey was completed, Hanson conducted a comprehensive hydraulic analysis of the sewer (the first one since the 1940s).  From this data, we developed a detailed computer model of the sewer and a runoff simulation model to determine system overload.  From the model, we were able to determine where the sewers were under capacity so we could address the worst areas first.

In keeping with our goal to restore structural integrity and increase system capacity of the sewer at the least cost, we decided to replace specific sections (where most needed), repair and rehabilitate the remaining sections, and construct new relief sewers where possible.  We used the following techniques to reach our goal:

  • Coated the original brick walls with welded wire fabric and shotcrete, a sprayable concrete, to increase structural integrity in the sewer’s weakened areas.
  • Replaced a portion of the sewer, deficient in both size and capacity, using tunneling techniques. 
  • Used pipe-jacking techniques to construct about 1,000 feet of new sewer in the downtown Springfield area.  This was the longest and most extensive tunnel project in the city’s history.
  • Rerouted a portion of the sewer to allow for the fill and abandonment of a failing segment that was located beneath two large buildings.