The
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: Currently approximately 80% of properties within the pilot project area are participating or have documented recent service replacements. Completed 30% design work..
Next Milestones: Complete 60% design work.
Sunnyland
Craig Mueller, P.E.
Project Engineer
Phone: (360) 778-7922
Email Public Works
