Basin 1022 Infiltration and Inflow Rehabilitation

Client—City of Chehalis, Washington

Gibbs & Olson provided surveying and design services for this Infiltration and Inflow (I&I) project. The 2010 I&I Strategic Plan, prepared by Gibbs & Olson, identifies Basin 1022 as the City’s highest priority basin for rehabilitation. This phase consisted of replacing 4,000 feet of 8 inch and 1,300 feet of 12 inch main sewer pipeline utilizing trenchless construction. The project also included replacement of all existing manholes and side sewer laterals from the main to the public right-of-way line along the pipeline route. Additionally, a replacement forcemain across the Salzer Creek Bridge was designed.