Background/Discussion
The Mosquito Creek sanitary sewer is a major trunk sewer that serves the east side of the City.
Two locations are in need of pipe rehabilitation. One location is just south of the intersection of Madison Ave. and Valley View Drive. This sewer is located along the bank of the creek and has developed cracks/holes from corrosion that are in need of repair. Due to the location of the pipe near the creek, accessibility is difficult. The method of rehabilitation will be Cured-in-Place Pipe Lining (CIPP). This is a no dig rehabilitation process where a liner is pulled through the pipe.
The second sanitary sewer rehabilitation is along Mosquito Creek just north of East South Omaha Bridge Road. As part of the railroad consolidation that took place in 2016\2017 for the Council Bluffs Interstate Improvements, the BNSF railroad relocated their tracks adjacent to the sewer and under the new I-29 Bridges. The sewer was identified to be lined with CIPP once the railroad construction was complete. The City entered into agreement U-2014-16035 with the Iowa DOT for reimbursement to line the pipe.
This project is planned for the FY21 CIP with a preliminary budget of $865,000, with a reimbursement of $373,250 from the Iowa DOT.
HGM Associates was previously selected to develop a cost estimate for the sewer lining near the BNSF tracks for the Iowa DOT agreement, and has assisted the City with other sewer relocations/rehabilitations associated with the CBIS Program. The pipe lining scope for both locations is similar to other projects designed by HGM and the project team has familiarity with these sites. It is appropriate for HGM to provide engineering services for this project.