Water & Wastewater Market Projects

Oakland-Macomb Interceptor
Drain Repair Program 
The Oakland-Macomb Interceptor Drain (OMID) is a large diameter deep sewer system that serves over 800,00 residents of Southeastern Michigan. Over the past 13 years, NTH has been leading the design and construction administration team, including on-site resident engineering, as-needed construction engineering, submittal reviews, contractor substitutions, pay applications, and community outreach programs for more than six different contracts. This all has resulted in NTH being presented with 6 different awards from 2012 until 2017.

Clinton-Oakland Interceptor Failure - Emergency 54" Sanitary Restoration
Consulting Engineering and Construction Observation and Testing
As a sinkhole developed over a 54-inch diameter sewer, causing closure of a busy road, it was imperative to quickly make decisions regarding repairs and methods of excavation through challenging subsurface conditions.  The Oakland County Water Resources Commissioner’s office selected NTH as the engineer of record for this project based on their familiarity with NTH’s exceptional capabilities in providing successful and cost-effective solutions to similar emergencies. NTH implemented solutions, including a modular bracing support system, groundwater cut-off deep sheeting, and strategically placed dewatering wells, that reduced the construction schedule by several weeks and saved thousands of construction dollars.

OCWRC Clinton Interceptor - 66" Steel Sewer River Crossing
Condition Evaluation and Repair Design
A 66-inch diameter sewer line, the primary influent line for the Clinton River Water Resource Recovery Facility, crosses over the Clinton River in Pontiac. OCWRC staff observed cracks in the sewer and retained NTH to study potential causes and subsequently to provide design services for a permanent repair. Without intervention, the pipeline was certain to fail, creating an environmental and economic disaster to the surrounding community. With improvements now in place, the infrastructure will last well beyond the 50-year life span of the original pipeline and offers expanded opportunities for future pipeline inspections, maintenance, and simplified future system connection/expansion options

Telegraph Franklin Sewer Replacement
Water Main Collapse and Sinkhole
​Following a water main break which resulted in a large sinkhole in Southfield, Michigan, an investigation determined a portion of an existing sanitary sewer below the watermain was collapsed and utilities including gas mains, storm sewers, and communication lines were impacted.  NTH was retained to lead a design-build emergency rehabilitation. Several rehabilitation alternatives were considered but based on the required hydraulic capacity and other field challenges, a 350-foot, 24-inch HDPE pipe using Horizontal Directional Drilling (HDD) technology was selected. Using this solution, the sewers were restored, and the sinkhole area was stabilized without impacting existing utilities, structures, and the highway. This project received the ACEC/M Honorable Conceptor Award for Engineering, National Recognition Award for Engineering, and Water & Wastes Digest 2019 Top Project Award.

Barton Dam
Piezometer Installation and Stability Analysis
​​The Barton Dam has had seepage issues for several years. The ground conditions at the site are quite variable and groundwater under artesian pressure and flowing well conditions, in open standpipe piezometers, are present at the dam. To clearly identify the groundwater flow regime within and beneath the dam, NTH developed a subsurface investigation plan for approval by the Federal Energy Regulatory Commission (FERC) to install a series of vibrating wire piezometer within the crest and downstream footprint to measure the piezometric levels within, and beneath the dam. 

Ann Arbor Waste Water Treatment Plant Facilities Renovation
Geotechnical, Hydrologic, and Construction Dewatering Engineering, and Geotechnical Instrumentation
​This project included demolition and reconstruction of the West wastewater treatment plant, while maintaining operation of the East wastewater plant. Since excavation the work could potentially breach the aquifer confinement and result in uncontrollable flooding, NTH developed a comprehensive phased dewatering and geotechnical instrumentation program through a specialized geotechnical investigation and extensive hydrologic modeling.