Major Infrastructure Improvement Projects Completed in 2017-2018
Water Treatment Plant Improvements (Wholesale)
The improvements to SJWD's water treatment plant for FY 2017-18 included completion of the WTP improvements for the flocculation/sedimentation process, cleaning and repairs to the cover and lining of the Hinkle Reservoir, replacement of aged backwash hood pumps, addition of motor disconnects for the flocculation mix drive motors, construction of an improved spent lime grit containment area, addition of variable frequency drives for the alum feed pumps, various electrical and power system improvements, updates to the SCADA system to add the Hinkle underdrain and plant pumping system monitoring, and other miscellaneous work. These projects replace existing aged equipment that was beyond its useful lifespan, added safety features, and also provided for treatment plant operational redundancy, to help protect the facility in the event of a failure or maintenance need.
Baldwin Reservoir Overflow Improvements (Wholesale)
This project involved improvements to the overflow structure for the Baldwin Reservoir to keep debris and wildlife from entering the overflow outlet piping by installing a trashrack (heavy duty screen) to the inlet side of the overflow outlet structure.
Hinkle Reservoir Piezometer Improvements (Wholesale)
The existing piezometers at the Hinkle reservoir were upgraded to improve monitoring groundwater levels. The project consisted of installation of transducers (pressure measurement instruments) within each of the four piezometer wells. This project resulted in improved monitoring and reporting by automating the system and transmitting the real-time data into the SCADA system.
Olive Ranch Rd and Cavitt Stallman Rd Pressure Reducing Stations (Retail)
This project involved the design and construction of two new pressure reducing control valve stations (PRS’s) between the Bacon and Sierra pressure zones to provide supply to the commercial area at the north end of the Sierra Zone. The Olive Ranch PRS is located near the intersection of Ramsgate Drive & Olive Ranch Road, and the Cavitt Stallman PRS is located on Cavitt Stallman Road west of Hidden Valley Place. Construction for both of these PRS’s consisted of installing a new automated control valve system at two separate locations between the two pressure zones. These projects will reduce the pressure of the water being supplied from the Bacon Zone into the Sierra Zone when these two zones are interconnected during high water demand periods or in the event of a fire supply need. These projects will improve pumping plant efficiencies as well as fire emergency redundancy supply. The construction of these two new control valve stations will help improve turnover of stored water in the Kokila Storage Reservoir, and that will contribute to improved water quality in the reservoir, as well as in some of the existing Bacon Zone distribution piping. The installation of these new PRS's will also result in less demand on the existing Sierra Pump Station which was previously running at full capacity with all four pumps running during the high summer demand months.
Bacon/B2 Pressure Zone Control Valve Interties (Retail)
This project is planned to facilitate the expansion of the Bacon pressure zone into the northerly portion of the Sierra Zone. The construction of the new control valve station will result in an improved turnover of stored water in the Kokila Storage Reservoir, and that will contribute to improved water quality in the reservoir, as well as in some of the existing Bacon Zone distribution piping. The installation of the planned new PRS's and the expansion of the Bacon Zone into the Sierra Zone will also result in less demand on the existing Sierra Pump Station which is currently running at full capacity with all four pumps running during the high summer demand months (currently with no redundant pump in the event of a pump failure).
Los Lagos Tank Overflow Piping Improvements (Retail)
The existing Los Lagos Tank is a 1.65 Million Gallon welded steel, above ground storage tank that supplies the Lower Granite Bay and Upper Granite Bay pressure zones. This tank was recoated (painted) inside and out in FY 2016/17 to adequately protect the steel tank structure and thereby provide the required service life. Following the recoating project the next project was to improve the overflow piping to bring the storage tank up to current water storage standards. The project consisted of removing a segment of the existing overflow pipe, adding a screened air gap system to that pipe and then replacing the overflow pipe back onto the exterior tank wall. This project results in the Los Lagos Tank being fully in compliance with current waterworks standards..