Pipeline Rehabilitation M-1

Pipeline Rehabilitation M-1

This project proposes to rehabilitate approximately 5.74 miles of existing 8-inch sewer pipeline primarily within the paved right of way that includes rehabilitating 32 manholes (MHs), replacing 18 MHs, installing 23 new cleanouts and reconnecting approximately 603 serve laterals. Some improvements would occur in ornamental landscape areas. No disturbance to native vegetation is proposed. Excavation of the area would occur primarily over existing pipeline trenches, and previously disturbed soil. In all instances, the project combined with the related scope has been indentified 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 pipe 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 MH/cleanout access is required, a new MH/cleanout shall be installed. Depth of new manholes, spot/point repairs would occur in existing disturbed trench, varying in depth between 5 to 24 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 repair 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 repair involve excavation of an approximate 3'W x 10'L area, from the ground surface to the existing pipeline.

San Diego

San Diego