SF Water, California

“Castlewood Reservoir equipment is old and dilapitated. UPS, injection system and other components in the
electrical room need upgrading”

“This program funds various improvement projects at Baden Pump Station:
1. Inspect and repair compressors’ internal seals, water intrusion in oil
2. Replace all obsolete panel boards and disconnect switches at the pump station
3. Repair storm drain issues – drains have been closed/broken”

This project expands the SFPUC Microwave network to include the Thomas Shaft facility and surrounding area for security, radio communications and SCADA purposes. It Includes development of intermediate radio sites from leased facility (KHKK Radio Station) to HHWP Transmission Tower, both required to reach Thomas shaft from existing sites.

“Water Pump Station (NPF 925) Improvements:
The Water Pump Station (NPF 925) contains a storage tank and water pumps for the No. 2 (W2) Water
system at NPF. Major plant water uses of W2 water at the plant include primary clarifier washdown after a
wet weather event, screen rinses, and seal flush. To maintain system reliability, the equipment will need to be
replaced or rehabilitated.
The improvement needs include:
• Replace all valves and pumps
• Replace all equipment/tanks
• Provide redundant backflow preventer for each system, to aid annual certification
• Replace roll-up doors
• Replace starters, wiring, and water tanks Receiving Structure (NPF 019) Rehabilitation
The receiving structure at NPF is the headworks facility that receives influent wastewater and screens the
influent to protect downstream equipment. The fine screening facility includes two bar screens. Material
removed by the fine screens drops onto an inclined conveyor which transports the collected screenings to the
adjacent extension structure for compaction and deposit into a dumpster. The facility includes HVAC
equipment and ducting for ventilation. The foul air exhaust from the building, including the dumpster
enclosure, is captured and treated using and odor control unit (OCU).
To maintain system reliability, the equipment will need to be replaced or rehabilitated. Concrete exposed to
wet conditions should be patched and coated to extend life. The improvement needs include:
• Patch & coat concrete and rehab deficiencies
• Replace HVAC equipment
• Rehabilitate bar screens
• Rehabilitate compact dumpsters
• Replace air diffuser blowers
• Rehabilitate screening conveyors”

This project includes planning, design and construction of the proposed sewer work in coordination with the Geary BRT Phase 2 project. Currently, the 38 Geary bus service delivery is relying on motor coach with bus stations closer to the curbs. The proposed center-running dedicated lanes on Geary Boulevard will be directly above some existing sewers. The proposed sewer replacement alignment is mostly recommended with a twin system outside of the new transit platforms and center-running BRT lanes for ease of future maintenance and prevention of service disruption to MUNI operation. There are approximately 22% of the street blocks within the project limit have existing twin collection system. The existing sewer infrastructure within the Geary BRT Phase 2 limits, the available age, materials and past condition assessment of sewers were taken into consideration to determine the proposed sewer replacement scope. It is assumed in the Geary BRT Phase 2 project improvements, SFPUC would prefer replacing all aging brick sewers and other structurally inadequate sewers in need of repair or replacement. The preliminary project estimated costs are based on the assumption that 78% of the existing sewers are recommended in need of replacement, where 40% of the existing sewers are over 90 years old. Replacement need of the remaining 22% of the sewers will be determined by condition assessment; project cost will be adjusted accordingly. Sewer replacement work is recommended along Geary corridor and the cross streets intersecting Geary Boulevard. Some of the sewers along the cross street avenues (2nd, 3rd, 10th, 11th, 27th, 28th and 30th) were replaced on or after 1997. About 11% of the sewers have been identified for replacement. The proposed replacement work is assumed with open trench construction technique using equivalent pipe sizes. It is recommended that condition assessment is performed on all sewers along the Geary corridor within the project limit for trenchless rehabilitation assessment. Hydraulic analysis will be performed to determine the appropriate proposed sizes and project scope/estimate will be adjusted accordingly.