2009 Comprehensive Sewer Plan identifies the need for broad inflow
(surface water entering the sewer system) and infiltration (groundwater)
reduction efforts. The Central Basin Inflow and Infiltration (I&I) Project
is designed as a pilot project to study I&I contributions and evaluate
techniques and cost for rehabilitation of the sewer system. The
rehabilitation will consist of replacing and relining sewer mains and
individual sewer service laterals by trenchless methods. Trenchless
rehabilitation will minimize digging and trenching disturbances.
The Central Basin (Sunnyland) Project area was identified due to the high amounts of I&I in the sewer basin, a significant number of sewer mains in the basin already identified for replacement, and large amounts of I&I from private laterals. The project would reduce I&I by replacing sewer mains, repairing manholes, and replacing private laterals.
Accomplishments: All 20 city blocks within the project
area have been completed. Project included replacement of sewer mains and
sewer services to participating properties as part of an inflow and
infiltration reduction pilot project. One year warranty period has begun.
Next Milestones: Project substantially complete.
Craig Mueller, P.E.
Phone: (360) 778-7922
Email Public Works