The Situation
Master Lift Station 13A in Manatee County, Fla., was in need of rehabilitation due to heavy deterioration of its walls and high levels of hydrogen sulfide (H2S). The sanitary manhole at the intersection of North Lake Way and Mockingbird Trail in the town of Palm Beach, Fla., was a heavily deteriorated brick structure exhibiting the presence of groundwater infiltration. Additionally, the bench and the inverts were compromised due to wastewater traffic. With one additional service line feeding the manhole, the structure was consistently surcharged. The city was looking for a structural rehabilitation and a fast return to service. Sak Construction LLC of Palmetto, Fla., a Sprayroq Certified Partner, turned to SprayWall to solve the problem that was causing the overuse of pumps.
The Solution
As a standard procedure, the manhole was pressure washed at 3,000 psi to remove debris. Sak prepared the structure, utilizing a hydraulic cementitious mortar to provide a smooth substrate vital to the successful adhesion of SprayWall. New bench and trough structures were created to ensure a smooth transitional channel for the existing effluent flow.
Sak then addressed the infiltration by strategically drilling a 1-in. hole at the point of intrusion, and pumped in acrylamide grout material with a topcoat of IPA Systems Octoplug mortar. After the structure had been suitably prepared, Sak’s certified Sprayroq applicators then applied SprayWall to the entire structure at a thickness of 0.25 in.
The Results
The entire manhole was structurally rehabilitated, leaving the owner with a monolithic, corrosion- and abrasion-resistant surface. The interior walls were rigid enough to make typical maintenance tasks, such as lowering a vacuum truck tube inside, possible without the worry of damaging the manhole’s interior.
