The project: Serving as Prime Consultant, IMEG provided structural engineering and survey services to correct existing concrete cracking and leakage of the common influent and effluent gallery walls.

The goal: The owner wanted to correct any current deficiencies to mitigate future cracking and leakage.

Scope of work: The team evaluated the structural concrete deficiencies and proposed a continuous augmentation/thickening of the walls with other structural enhancements. In addition, the filter walls were blast cleaned and noted cracks injected with hydrophilic urethane. Modifications were made to the 16-inch and 30-inch effluent pipes in the effluent gallery to accommodate the augmented walls. In severely cracked areas at the filter “slots” the concrete wall was partially or completely broken out and replaced with a silica-fume enhanced repair concrete. Due to limited access to the enclosed filter galleries, a shotcrete application was implemented. Mechanical modifications included relocating existing small diameter piping and instrumentation along the gallery walls and cutting and relocating the effluent gallery 30-inch effluent piping, 30-inch manway blind flange, and 16-inch air piping flanges. Electrical modifications included the relocation of minor electrical appurtenances and include outlets and sump pump junction boxes.

The outcome: The improvements helped restore the water treatment plant to continue serving its community for years to come.