In the spring of 2020, EJP's Team PPF collaborated with the environmental consulting firm Woodard & Curran to tackle a complex wastewater treatment issue at a shopping center in Hingham, Massachusetts. The system supports The Derby Street Shops, a property owned by a major retail company with similar locations across the United States.
After conducting a comprehensive assessment, Woodard & Curran’s project team devised a strategy to address the challenges faced by the sanitary manhole structures at the shopping center. These issues included severe corrosion of the manhole structures, the release of unpleasant odors due to hydrogen sulfide gases, and water seepage around the manhole inlet and outlet pipe connections.
Team PPF's task was to create a series of treatments to effectively handle each of these challenges. The corrosion had to be repaired, but it was equally crucial to safeguard the manholes against future corrosion. The offensive smell emanating from the escaping gases needed to be neutralized. Additionally, the groundwater infiltration was causing an excessive load on the wastewater system, leading to unnecessary costs as the system processed more water than needed. The project had to stay within budget, and a strategy was required to minimize disruptions to retail operations during the repair process.
Thanks to the COVID-19 pandemic, which led to many stores being closed to the public during the construction phase, the project moved forward faster than usual. All three manhole structures were successfully repaired and rehabilitated.
The initial step involved reconstructing the manholes. Due to the infiltration of winter road salt used in the surrounding traffic and parking areas, all the concrete structures had deteriorated. After completing the structural repairs, the leaks causing stormwater infiltration were sealed using a high-performance moisture-activated grout. This specific grout, designed for concrete structures, was chosen because it can absorb up to 12 times its weight in water while forming a strong, waterproof gel with excellent adhesive properties.
Following these steps, it was essential to protect the manholes from future corrosion. Team PPF lined the structures with an epoxy coating system engineered to provide up to 75 years of protection in highly corrosive sewer environments. These products were developed to combat corrosion, microbial attacks, abrasion, and sewer gases.
With the manhole structures rebuilt, sealed, and coated, the final step was addressing the water infiltration from the pavement above and around them. At the top of each structure, water inflow dishes were installed to capture unwanted inflow and prevent it from entering through the manhole lid. These dishes are often used to reduce the amount of stormwater entering the wastewater system.
On any project, Team PPF evaluates various factors, including life cycle costing. It’s essential to understand the effective lifespan of any solution to determine its long-term value. This involves assessing not just the cost of repairs but also their expected longevity.
At the Derby Hill Shops, all these considerations were vital. Through teamwork and open communication between Woodard & Curran and Team PPF, a solution was found for a very intricate problem. Both parties aimed to develop and implement a plan that resolved current issues and ensured lasting value.
Established in 2008, Team PPF, part of E. J. Prescott, Inc., offers a unique blend of industry-leading technology and the innovative talents of its team members. Their expertise covers strategic planning, communication, custom fabrication when necessary, selecting the right product portfolio, and on-site custom installations. The Derby Hill Shops project exemplifies the collaboration needed to identify challenges, formulate a robust plan, and execute it effectively. If you have any questions or need assistance, feel free to reach out!
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