Facilities Engineering Phase VI Project
Goleta West Sanitary District (GWSD) through its ongoing Closed Circuit Television Inspection Program identified several 6-inch diameter sewer pipelines that are in need of repair or replacement. The defects in these mainlines are primarily root intrusion and groundwater infiltration at the pipe joints. Additionally, GWSD design standards specify that the minimum pipe size for a sewer mainline is 8-inch diameter. Therefore, the District is embarking on a project to remove and replace approximately 5,400 feet of deteriorated 6-inch pipe with 8-inch PVC pipe.
This project is part of Goleta West Sanitary District’s (GWSD) ongoing capital improvement program and is being paid for with reserve funds set aside for this purpose. Construction is expected to begin in June 2017 and be completed in December 2017 at a cost of $1,400,000.
The Facilities Engineering Phase VI Project (Project #16-03) also includes connection of approximately 111 existing sewer services to the new 8-inch pipe, remodeling of approximately 36 associated manholes and application of a special coating to stop the threat of sewer gasses deteriorating the concrete structure of the manholes.
The sewer pipeline segments included in Project #16-03 are primarily located in the Isla Vista and Lake Los Carneros areas. The pipelines in the Isla Vista area are some of the oldest in the District. Some are over 50 years old.
Phase VI Pipeline and Manhole Maintenance Project
As part of Goleta West Sanitary District’s (GWSD) ongoing capital improvement program the District is commencing with a project to continue upgrading the integrity of its wastewater collection system. Construction is expected to begin in early June 2017 and be complete in November 2017 at a cost of $567,000.
The Phase VI Pipeline and Manhole Maintenance Project (Project #16-04) includes lining approximately 5,900 linear feet of pipeline. The existing pipes are primarily vitrified clay pipe with a small amount of asbestos concrete pipe. Pipe diameters range from 8-inch to 18-inch. Most of these pipelines are over 40 years old and suffer from root intrusion, small cracks or general deterioration. The pipes are being lined using trenchless technologies rather than digging up the pipes. This method is more cost-effective and less disruptive to the neighborhoods where the work will take place. All existing side sewer connections will be sealed with special cured-in-place “top hats”.
Project #16-04 also includes the rehabilitation of approximately 26 manholes ranging from 5 to 20 feet deep. These existing manholes are of concrete construction and primarily suffer from root intrusion and groundwater infiltration. The manholes will be repaired and sealed, then a special coating will be applied to the manhole walls to stop the threat of sewer gasses deteriorating the concrete structure of the manhole. This portion of the project is also trenchless to minimize the disruption to the neighborhoods where the work will take place.