The stories below describe how DSRSD plans and invests for the future, works to continually increase savings and efficiency, and protects public health and the environment.
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Video Inspections Prioritize Sewer Repairs
Situation: District employees clean and video-inspect about 10 percent of the 207-mile wastewater collection system every year. Using the recordings, we rate the condition of every pipeline according to national standards. Many sewer lines installed before 2000, however, had only poor-quality video recordings or none at all.
Solution: A specialty contractor, National Plant Services, cleaned and inspected 350,000 feet of these older pipelines in Dublin and San Ramon. Instead of taking several years, the work was completed in a single year, finishing in June 2017.
With a wealth of new pipeline condition data, the District can forecast future replacement costs more accurately and prioritize cost-effective maintenance and repairs before pipes fail. The $450,000 project was funded by sewer service charges paid by District customers.
No digging is needed to clean and inspect sanitary sewers. Working through existing manholes, the crew uses recycled water to flush the sewer pipes that run under the middle of the street. Flushing removes grease and roots that can cause clogs and sewage overflows. Then the crew sends a closed-circuit video camera through the pipe to record its condition.
Photo: Working at the bottom of a manhole, DSRSD wastewater systems operator lowers a robotic video camera into a sewer pipe. The map below shows older sewer pipes that were cleaned and inspected to complete assessments of DSRSD's entire sewer system system.