Engineered Solutions
Building Resilient Communities Through Innovation
At PURIS, engineered solutions aren’t an add‑on to our work, they are the foundation of everything we do. As aging underground systems place increasing pressure on municipalities, utilities, and private asset owners, the need for smarter, safer, and more sustainable renewal methods has never been greater. Our team brings deep technical expertise, advanced materials, and a problem‑solving mindset to every challenge, delivering custom trenchless solutions that extend asset life while minimizing disruption above ground.
Purpose‑Built Engineering for Complex Environments
As aging underground systems place increasing pressure on municipalities, utilities, and private asset owners, the need for smarter, safer, and more sustainable renewal methods has never been greater. Our team brings deep technical expertise, advanced materials, and a problem‑solving mindset to every challenge, delivering engineered solutions that extend asset life while minimizing disruption above ground.
Innovation Backed by Technical Rigor
Every PURIS solution is grounded in engineering discipline. Our team performs detailed condition assessments, structural modeling, and material evaluations to ensure the selected approach delivers predictable, verifiable performance. Whether the goal is to restore structural integrity, improve flow capacity, or protect against corrosion, we engineer rehabilitation designs that stand up to real world conditions.
Minimizing Disruption, Maximizing Longevity
Trenchless renewal is about more than avoiding excavation—it’s about delivering long term value. PURIS solutions are engineered to reduce lifecycle costs, accelerate installation timelines, and protect communities from unnecessary surface impacts. By combining advanced materials with proven installation methods, we help owners achieve durable, sustainable infrastructure renewal without the disruption of traditional dig and replace construction
A Partner for the Full Project Lifecycle
From early‑stage feasibility studies to final commissioning, PURIS provides engineering support at every step. Our multidisciplinary team works to anticipate challenges, streamline constructability, and ensure that each solution aligns with the owner’s operational, environmental, and budgetary goals. The result is a collaborative, transparent process that leads to smarter, more resilient underground systems.
Robert W. Hite Plant and Interceptor Rehabilitation
Challenge
Metro Water Recovery needed to rehabilitate nearly 50,000 LF of mid‑ to large‑diameter interceptors and major plant infrastructure while maintaining uninterrupted 130 MGD treatment operations, including a full bypass of the Robert W. Hite Plant. The project required complex coordination, winter‑condition curing, multiple structure reconstructions, and management of a 40 MGD continuous bypass pumping system operating for seven months.
Solution
Inliner deployed engineered trenchless solutions—CIPP across all pipe sizes, heat‑cured CIPP for the 114" influent pipe, and non‑circular Hobas sliplining—to minimize disruption to critical infrastructure. Using the CMAR model, Inliner led preliminary design, constructability reviews, scheduling, and price guarantee, self‑performed all rehabilitation work, and engineered extensive flow diversions and bypass systems to protect plant operations and the environment.
Results
The team delivered a $31M complex rehabilitation program within the system’s optimal operating window and without any service interruptions, successfully maintaining full plant treatment capacity. All interceptors, structures, and plant components were rehabilitated with minimal environmental and social impact, demonstrating a fully integrated engineered solution from design through construction.
GLWA 7 Mile Road Emergency Repair
Challenge
GLWA required emergency rehabilitation of 9,550 LF of an 11'-6" arch combination sewer with significant structural deterioration, made more complex by the presence of a 24-inch high‑pressure gas main within 2 feet of the required access shaft.
Solution
IWPC deployed a series of engineered solutions, including a precisely located reinforced access shaft, adaptive steel weirs for customized flow control, and a remotely operated hydro‑demolition system, to ensure safe, accurate concrete removal and reconstruction. Structural restoration utilized engineered materials such as epoxy‑coated WWF and Geopolymer, and incorporated design-driven modifications to fifteen manholes with new GLWA hinged frames and covers.
Results
Through strategic planning and engineered sequencing, IWPC accelerated the project timeline by more than six months, completing all structural repairs ahead of the originally planned mid‑2026 date. Only the weather‑dependent surface restoration around the new engineered access structure remains, scheduled for Spring 2026.
Triple Barrel Culvert Rehab Indianapolis Motor Speedway
Challenge
After the 2024 Indy 500, IMS identified a sinkhole caused by a leaking triple‑barrel stormwater culvert beneath the high‑risk junction of Pit Lane and Turn One, requiring an engineered fix without disrupting track operations. The failure involved subsurface voiding and deteriorated CMP culverts, demanding rapid diagnosis and a structurally reliable solution in an area with zero operational tolerance.
Solution
Inliner deployed a fully engineered rehabilitation plan, including precision subsurface void grouting, installation of thick inversion CIPP liners with thermal steam cure for the three large-diameter culvert barrels, and sealing of the downstream headwall to eliminate leak pathways. The approach mirrored CMAR‑style coordinated execution seen in similar complex projects, leveraging partner expertise, accelerated scheduling, and seamless stakeholder collaboration to ensure structural integrity and operational continuity.
Results
The culvert system was fully rehabilitated in under 30 days, delivered under budget, and completed without interrupting IMS track activities. The engineered solution restored structural stability beneath one of the most critical points on the Speedway, demonstrating the effectiveness of rapid, collaborative, trenchless rehabilitation.
Salt Creek Intercepting Sewer No. 3 Rehabilitation
Challenge
MWRD required the rehabilitation of over 14,000 LF of aging, large‑diameter sewer—including complex shapes such as 42" × 60" ovals—along with manholes, junction chambers, and missing invert sections in a densely developed corridor. The project demanded precise engineering, access route construction, and strict compliance with MBE/WBE/VBE participation goals while minimizing community and environmental disruption.
Solution
Inliner Solutions delivered a fully engineered, end‑to‑end approach using customized geopolymer lining for the 42" × 60" sewer, UV‑cured CIPP for the 36" sewer, FRP lining for junction chambers, and spray‑applied structural rehabilitation for 32 manholes. The team integrated design coordination, materials engineering, access logistics, and advanced rehabilitation technologies to ensure seamless compatibility with existing infrastructure and long‑term performance.
Results
The engineered rehabilitation program is expected to significantly extend the system’s service life, restore hydraulic efficiency, and enhance environmental protection along the Salt Creek corridor. The project delivers a durable, low‑disruption, corrosion‑resistant solution that meets all regulatory and participation requirements while minimizing excavation and community impact.
Gordie Howe International Bridge
Challenge
The Gordie Howe International Bridge project required rehabilitation of over 5,400 LF of aging, large‑diameter pre‑1920 brick sewers located within an active, highly congested construction footprint where traditional CIPP methods would have demanded major excavation and caused significant schedule and traffic impacts. IWPC was brought in mid‑project after termination of the prior subcontractor, inheriting schedule pressure, space constraints, and the need to coordinate with simultaneous grading, architectural, structural, and utility activities across the USPOE and MI‑75 areas.
Solution
IWPC engineered an alternative rehabilitation strategy by selecting geopolymer lining—accessible through existing manholes—to avoid large inversion pits, maintain site logistics, and meet structural design requirements for the 72", 78", and 82" brick interceptors. The team executed a full engineered workflow including pre‑cleaning CCTV, infiltration control via chemical grouting, structural geopolymer installation, post‑rehab PACP inspections, and tailored bypass systems, while also performing additional selective repairs, siphon‑strengthening work, and full CCTV inspection of new storm sewers.
Results
IWPC successfully rehabilitated all large‑diameter DWSD and GLWA sewers within the GHIB footprint with minimal site disruption, preserving critical construction access and preventing impacts to the broader bridge schedule. The engineered geopolymer approach restored structural integrity, improved service life, and enabled the project team to advance concurrent bridge, utility, and roadway work efficiently; final CCTV inspections of the MI‑75 storm network are nearing completion.