Salt Lake City Public Utilities Orange Street Sewer Rehabilitation Case Study

摘要

The Orange Street Sewer Trunk Line is one of Salt Lake City’s three major wastewater trunk linesrnthat convey sewer flow to the water reclamation plant. The Orange Street sewer consists of approximately five milesrnof 42-inch to 48-inch reinforced concrete pipe, originally installed in 1962, this sewer conveys approximately 12 MGDrnof wastewater to the City’s 96 MGD wastewater reclamation facility that was first build in 1965. Inspection andrncondition assessment of the Orange Street Sewer was performed utilizing technologies such as CCTV, sonar, and laserrnprofiling, which identified defects within the interceptor and quantified the extent of the deterioration. Rehabilitationrnof the sewer trunk line has been complicated by the fact that the sewer crosses, major railroad lines, commuter rails,rninterstates, a superfund site with contaminated groundwater, artesian springs, and is located within high groundwater.rnThe rehabilitation of the Orange Street trunk line was completed in two phases -- $11 million in the first phase and $3rnmillion in the second phase. Various trenchless repair methods were evaluated and bid for the first phase. Thisrnallowed contractors to consider several alternative feasible trenchless methods. Trenchless rehabilitation methodsrnutilized for first phase included Fiberglass Reinforced Pipe (FRP) Slip-lining and some Cure-In-Place-Pipe (CIPP).rnThe second phase was more diameter limiting and was bid as a CIPP project with jack-and-bore tunneling used forrnthe installation of bypass pipe under several major railroad tracks. This paper presents a case study on the lessonsrnlearned; design and construction issues, successes encountered during the construction of the project, and will detailrnthe evolution of the bid and selection process.