As part of Pittsburgh Water’s ongoing effort to modernize aging infrastructure, our team supported multiple sewer rehabilitation projects that enhanced system reliability, minimized risk, and extended the useful life of critical assets.

2020 Large Diameter Sewer Rehabilitation

We evaluated and designed the rehabilitation of three deteriorating brick sewer sections, including a 102-inch line near the East Busway in Shadyside and 48- and 60-inch lines in Heths Run near the Pittsburgh Zoo. Given their large service areas and proximity to key infrastructure, failure risk was high. GPD recommended spray-applied geopolymer lining as a cost-effective, long-term solution—an innovative approach approved and implemented by PGH2o. The 2020 LDSR Project was awarded the Wastewater Project of the Year for the American Council of Engineering Companies of Pennsylvania (ACEC/PA) in January 2024. This same project received a National Recognition Award from ACEC/PA’s national parent organization (ACEC) in February 2024.

2022 Large Diameter Sewer Rehabilitation

To address critical aging infrastructure near Corliss and West Carson Streets, PGH2o rehabilitated 1,150 feet of 60- and 72-inch diameter sewer. GPD used advanced multi-sensor inspection to assess the pipe’s condition and recommended Spray Applied Pipe Lining (SAPL) to accommodate deep, curved, and variable-sized segments. A major challenge—lack of upstream access—was resolved by designing two new deep manholes, one of which was later replaced with a rediscovered existing structure, saving costs. With access secured, rehabilitation proceeded efficiently and safely.

2023 Large Diameter Sewer Rehabilitation

Targeting two of the five 100+ year-old sewer segments beneath key infrastructure (West Busway, Norfolk Southern RR, and State Hwy 51), this project addressed the downstream portions of the Cork Run sewer. GPD’s strategic design and project management ensured early completion and cost savings, while supporting PWSA’s PENNVEST funding goals.

2024 Large Diameter Sewer Rehabilitation

PGH2o used trenchless rehabilitation to upgrade over 1,700 feet of large sewers at two sites: beneath the Birmingham Bridge and within Frick Park. At the bridge site, GPD leveraged 3D LiDAR data to locate and raise a buried manhole, avoiding the need for a new access point and reducing costs. In Frick Park, the focus was minimizing environmental and visitor impact, which was key to securing city approval. A Spray Applied Pipe Lining (SAPL) system was chosen for both locations to ensure minimal disruption and a small construction footprint.