Pipeline Rehabilitation O-1

Pipeline Rehabilitation O-1

This project proposes to rehabilitate approximately 33,432 linear feet (6.33 miles) of existing 8-inch sewer pipeline using trenchless technology that includes constructing 17 manholes (MHs), and cleanouts and conducting 8 spot/point repairs. Some improvements would occur in ornamental landscape areas. No disturbance to native vegetation I s proposed. In all instances, the project combined with related scope has been identified to occur in areas classified as "non-sensitive." Two methods of sewer main rehabilitation may be used for this project, both utilizing existing MHs and/or cleanouts. Both require access from two MHs and or a MH and cleanout for each pope segment: 1) Cured in place pipe (CIPP) liner is pulled through the sewer main, cured used hot water or steam, and cut at both manholes; and 2) Ribloc (spiral) liner is pulled through the sewer main as plastic strips and then formed to a pipe to create a new pipeline, within the existing pipe. In areas where a secondary sewer MH/cleanout access is required, a new MH/cleanout shall be installed. Depth of new manholes, spot/point repairs would occur at a maximum depth of 4 feet from grade. The installation of the MH is a 5' W x 5' L area and cleanouts are 3'W x 3'L area. Internal and/or external point repairs may occur in portions of pipe that require repair (i.e. due to offset joints, sags, or intruding laterals). Internal point repairs use the above methods, and involve similar methods as the rehabilitation and are contained solely within the pipe. External point repairs involve excavation of an approximate 3'W x 10'L area from the ground surface to the existing pipeline.

San Diego

San Diego