DATE:
July 17, 2024
SA01
TO:
Board of Directors, San Diego County Sanitation District
SUBJECT
Title
ESTABLISH APPROPRIATIONS AND ADVERTISE AND AWARD A CONSTRUCTION CONTRACT FOR JAMACHA FORCE MAIN AND GRAVITY MAIN SEWER IMPROVEMENTS AND RELATED CEQA EXEMPTION (DISTRICT: 1)
Body
OVERVIEW
The Department of Public Works (DPW) manages a sewer system maintenance program for communities within the San Diego County Sanitation District (District) jurisdiction. The District provides sewer service to nearly 37,000 customers in the unincorporated areas of San Diego County. One of the sewer lines that the District owns and maintains is the Jamacha Force Main and Gravity Main Sewer (Jamacha Sewer Main), which runs downstream through Jamacha Boulevard in the unincorporated community of Spring Valley. A gravity sewer system is a network of underground pipes that are designed to use gravity to move wastewater downward through a pipeline. A force main sewer system is designed to use pressure to move wastewater through the pipeline. Force main sewers are typically used to move wastewater from lower to higher elevations, where the terrain will not allow gravity alone to move the sewage through a pipeline. Wastewater flows from the Jamacha Sewer Main continue to move downstream and eventually reach the City of San Diego's Point Loma Wastewater Treatment Plant, where the treated wastewater is discharged four and a half miles into the Pacific Ocean. Years of comprehensive ocean monitoring by regulatory agencies at the discharge site have demonstrated that the treated water is diluted enough to protect the ocean environment effectively.
The District performed a condition assessment of the Jamacha Sewer Main in 2021 using closed-circuit cameras to inspect the interior of the pipe. It determined that the sewer main needed rehabilitation due to age, material, and deterioration. The Jamacha Sewer Main and connected maintenance holes were constructed in 1978. The typical expe...
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