The District is making needed improvements to the water and sanitary sewer infrastructure. The District has approved the following Fiscal Year 2025‐2030 capital improvement water projects to increase the safety and reliability of the water system. Total cost: $13,168,326.
The current projects include:
Christen Hill Tank Water Main Improvements
BACKGROUND: Zone 3 is supplied water from the North Coast County Water District's (NCCWD) Christen Hill Tank located at the northeast corner of intersection of Glencourt Way, Skyline Blvd and King Dr. Although the tank is owned and maintained by NNCWD, the District has an agreement to use the tank for Zone 3 storage. Water is moved into Zone 3 via a 24" transmission water main located within the tank's access driveway which crosses the San Andreas Fault approximately 800 feet uphill from the site entrance. Hydraulic modeling shows the 24" water main is oversized and can be replaced with a fully restrained and earthquake resistant 16" water main. This project will replace the existing 24" water main and install a combination of new 16" ductile iron pipe (DIP) and earthquake resistant ductile iron pipe (ERDIP).
BENEFITS: The Christen Hill Tank Water Main Improvements replaces an aging and oversized water main and improves seismic resiliency.
King Dr Improvements
BACKGROUND: Zone 3 is supplied water from the North Coast County Water District's (NCCWD) Christen Hill Tank located at the northeast corner of intersection of Glencourt Way, Skyline Blvd and King Dr. Although the tank is owned and maintained by NNCWD, the District has an agreement to use the tank for Zone 3 storage. To get water from the tank site to Zone 3, the District uses a combination of 24" and 12" pipe. The 12" asbestos cement pipe (ACP) water main portion is located in a cross country (CC) area within a few feet of San Andreas fault, with limited access and exact location unknown. This project abandons the existing 12" CC and installs a new 16" water main along King Dr using a combination of ductile iron pipe (DIP) and earthquake resistant ductile iron pipe (ERDIP).
BENEFITS: The King Drive Improvements eliminates a CC water main, improves water main accessibility, and improves seismic resiliency.
Myrna Lane Improvements
BACKGROUND: A 150 LF cross country (CC) 6" asbestos cement pipe (ACP), is located between 3746 and 3750 Myrna Ln. This water main connects an existing 6" CC ACP located in the open space area between Myrna Ln, Cork Pl, and Famee Ct to a 450 LF 4" ACP on Myrna Ln with two dead ends. Should a break occur on the CC water main, there is significant risk of water damage to surrounding properties. This project abandons both the 4" and 6" ACP, replaces 300 LF of 6" ACP with 8" ductile iron pipe (DIP) and relocates services on the 4" ACP to the new 8" DIP. Hydraulic analysis shows the abandonment and replacement of the existing water mains has no adverse affects on fire flows within the area except for the fire hydrant located across 3747 Myrna Ln. This fire hydrant experienced a 24% decrease in residual pressure yet the residual pressure (39 psi) was still greater than 20 psi during a 2,500 gpm fire flow.
BENEFITS: The Myrna Lane Improvements abandons a CC water main, eliminates dead ends, replaces aging pipes with new 8" DIP, and reduces District maintenance.
Callan Park Cross Country Abandonment
BACKGROUND: Callan Park is located between the back of homes on Myrna Ln, Farnee Ct, and Tyrone Ct and has a 1,050 LF 6" asbestos cement pipe (ACP) cross country (CC) water main connecting to water mains on Sean Ct, Erris Ct, Tyrone Ct, Farnee Ct and Cork Pl. The 6" CC ACP water main is difficult to access and could cause significant property damage if a break occurs. This project abandons the 6" CC ACP however creates 5 dead ends on each of the previously mentioned streets. To minimize the fire flow decrease, the existing 6" and 8" ACP on the above courts will be replaced with 8" ductile iron pipe (DIP). Hydraulic analysis indicates a maximum 14% decrease to fire flows on the courts however all locations are well above the 1,500 gpm at 20 psi recommendation. A water age analysis also indicates water turnover is sufficient on the courts with the increased pipe size. Upon water main abandonment, the District can quitclaim the water main easement along the abandoned alignment.
BENEFITS: The Callan Park Cross Country Abandonment abandons a CC water main, replaces aging water mains, improves seismic resiliency, and reduces District maintenance.
Callan Blvd Pump Station
BACKGROUND: Skyline Pump Station is located at the Skyline Tank Site and moves water from Zone 2 to Zone 3. The existing pump station consists of 2 30-HP pumps installed in 1972 and the building itself is in poor condition. The pumps, building and associated infrastructure have long exceeded their life expectancy. This project relocates the Skyline Pump Station to the intersection of Westborough and Callan Blvds eliminating 1,900 LF of water main on Westborough Blvd and Carter Drive. By abandoning these high risk water mains, some of which cross the San Andreas Fault, the District greatly reduces its maintenance and failure exposure. Electrical and mechanical engineers will design the new pump station to the highest efficiency to reduce the District's future power costs.
BENEFITS: The Callan Blvd Pump Station replaces an obsolete pump station, abandons 1,900 LF of high risk water main, reduces District maintenance, and improves seismic resiliency.
Callan Blvd Improvements
BACKGROUND: Callan Blvd between Meath Dr and Carter Dr has approximately 2,600 LF of 10"-12" asbestos cement pipe (ACP) in addition to approximately 1,250 LF of parallel 4"-8" ACP. This project replaces the parallel water mains with a single 12" ductile iron pipe (DIP). Combining this project with CIPs W20-02, W20-03, W20-07 and W20-14 will create a new earthquake resistant 12" DIP backbone between the Callan Blvd Pump Station (W20-07) and Christen Hill Tank. In addition, this project will replace old and aging water mains, improve hydrant spacing, and reduce District maintenance.
BENEFITS: The Callan Blvd Improvements replaces parallel water mains with a single water main, improves fire protection in the area, greatly reduces District maintenance, and improves seismic resiliency
Daly City Emergency Intertie
BACKGROUND: The District has an emergency intertie with City of Daly City at the intersection of Callan Blvd and King Dr. This connection can provide Zone 3 water in case of an emergency if Christen Hill Tank is out of service. Past operational tests indicate the intertie is inoperable and the bi-directional meter only recorded in one direction. This project rebuilds the intertie and add SCADA functionality to communicate with the District's system.
BENEFITS: The Daly City Emergency lntertie ensures a reliable emergency connection with Daly City and improves seismic resiliency.
Skyline Tank Site Improvements
BACKGROUND: The Skyline Tank Site has an approximate 20,000 SF unpaved area between and behind the three storage tanks with a downward slope towards the westerly fence. The unpaved area is inaccessible when wet and requires additional maintenance for weed and erosion control. This project involves installing a retaining wall along the westerly fence, leveling behind the tanks and paving the area. These improvements will improve site access, simplify maintenance, and eliminate weed and erosion control issues.
BENEFITS: The Skyline Tank Site Improvements improves access, simplifies maintenance, and eliminates weed / erosion control issues.
Skyline Tank No. 1 Improvements
BACKGROUND: In February 2018 the District completed a condition assessment of Skyline Tanks (3 total) including coating inspections and structural analysis in the event of a 2,475-yr earthquake (2% chance probability of exceedance within a 50-yr period). The Skyline Tanks are the District's primary water storage facility and therefore essential to providing service, especially fire suppression, following an earthquake. Skyline Tank No. 1 retrofit recommendations include structurally retrofitting the tank's roof to withstand the design level earthquake at operating levels of up to 25 feet and jacking the center column to alleviate settlement. In addition, recommendations also include appurtenance upgrades including overflow relocation to exterior, ladders, guardrails, roof hatches, shell manholes, level indicators, center vent, sampling station, seismic valve, flush cleanout, and drain outlet. Work also includes a full recoat of the tank exterior and interior roof.
BENEFITS: The Skyline Tank No. 1 Improvements protects and extends the tank's service life, ensures tank integrity following the design level earthquake, provides tank isolation during a seismic event, and reduces water waste.
Skyline Tank No. 2 Improvements
BACKGROUND: In February 2018 the District completed a condition assessment of Skyline Tanks (3 total) including coating inspections and structural analysis in the event of a 2,475-yr earthquake (2% chance probability of exceedance within a 50-yr period). The Skyline Tanks are the District's primary water storage facility and therefore essential to providing service, especially fire suppression, following an earthquake. Skyline Tank No. 2 retrofit recommendations include structurally retrofitting the tank's roof to withstand the design level earthquake at operating levels of up to 25 feet and shell strengthening/banding. In addition, recommendations also include appurtenance upgrades including overflow relocation to exterior, ladders, guardrails, roof hatches, shell manholes, level indicators, center vent, sampling station, seismic valve, flush cleanout and drain outlet. Work also includes a full recoat of the tank exterior and interior roof.
BENEFITS: The Skyline Tank No. 2 Improvements protects and extends the tank's service life, ensures tank integrity following the design level earthquake, provides tank isolation during a seismic event, and reduces water waste.
Skyline Tank No. 3 Improvements
BACKGROUND: In February 2018 the District completed a condition assessment of Skyline Tanks (3 total) including coating inspections and structural analysis in the event of a 2,475-yr earthquake (2% chance probability of exceedance within a 50-yr period). The Skyline Tanks are the District's primary water storage facility and therefore essential to providing service, especially fire suppression, following an earthquake. Skyline Tank No. 3 retrofit recommendations include structurally retrofitting the tank's roof to withstand the design level earthquake at operating levels of up to 25 feet, shell strengthening/banding, and foundation improvements to mechanically anchor the tank. In addition, recommendations also include appurtenance upgrades including overflow relocation to exterior, ladders, guardrails, roof hatches, shell manholes, level indicators, center vent, sampling station, seismic valve, flush cleanout and a drain outlet. Work also includes a full recoat of the tank exterior and interior.
BENEFITS: The Skyline Tank No. 3 Improvements protects and extends the tank's service life, ensures tank integrity following the design level earthquake, provides tank isolation during a seismic event, and reduces water waste.
Westborough Blvd Improvements
BACKGROUND: The existing Zone 2 12" asbestos cement pipe (ACP) along Westborough Blvd is the primary transmission water main for moving water from the Westborough Pump Station to the Skyline Tanks. The same water main back feeds Zones 1 and 2 from Skyline Tanks. The water main crosses the San Andreas fault approximately 300 feet west of Callan Blvd. In the event of an emergency or break on this main, the District would be unable to supply Zones 1 and 2 with it's own water supply. The District however could utilize the NCCWD and Daly City interties to supply Zones 1 and 2 through Zone 3. This project replaces 2,200 LF of 12" ACP with a combination of 12" ductile iron pipe (DIP) and Earthquake Resistant DIP (ERDIP). The ERDIP will be installed where the water main crosses the fault.
BENEFITS: The Westborough Blvd Improvements improves seismic resiliency and greatly increases the chances of water being available for Zones 1 and 2 in the event of an earthquake.
Shannon Dr. Development Improvements
BACKGROUND: Two cross country (CC) asbestos cement (ACP) water mains exist in the vicinity of the Shannon Dr and Oakmont Meadows subdivisions located between Westborough Blvd and Oakmont Dr: 1 ) an 800 LF 10" ACP just south connecting Westborough Blvd to Oakmont Dr and 2) a 200 LF 8" ACP connecting Westborough Blvd to Shannon Park Ct. Both are located in heavily vegetated, steep terrain making maintenance on these water mains challenging. Should breaks occur on these water mains there is a significant risk of property damage in the subdivision and to those along Oakmont Dr. This project abandons the CC ACPs however creates two dead ends in the upper portion of the subdivision. Hydraulic analysis indicates an approximate 30% decrease in fire flows at near the end of Shannon Park Ct however flows remain above 1,500 gpm at 20 psi with the exception of the very end where it is 1,400 gpm at 20 psi. This area can also be supplied water from hydrants along Westborough Blvd and other locations within the subdivision. All other locations in the subdivisions remain well above minimum fire flow recommendations.
BENEFITS: The Shannon Drive Development Improvements eliminates CC water mains, protects properties in the event of main breaks, and reduces District maintenance
City of San Bruno Emergency Intertie
BACKGROUND: The City of San Bruno, located on southeast side of the District's boundary, has a parallel water main with the District along Olympic Drive. This is an ideal location for adding a emergency intertie allowing San Bruno the ability to supply water to Zone 2 and vice versa contingent pressures are compatible between the two systems. In addition, approximately 400 LF of 6" asbestos cement pipe (ACP) will be replaced with 8" ductile iron pipe (DIP) along with 8 service connections and 1 fire hydrant replacement. SCADA functionality will also be incorporated into the intertie.
BENEFITS: The City of San Bruno Emergency lntertie creates a connection between two water systems capable of supplying each other water during emergency situations.
Wexford Ave Abandonment
BACKGROUND: A 4" asbestos cement pipe (ACP) water main exists on the east side of Wexford Ave between the driveway of the Friends to Parents School and 2585 Wexford Ave and is believed to be located on private property. Should a break occur on this water main, there is significant risk of property damage on Wexford Ave. This project abandons the water main, relocates the Friends to Parents School service meter, replaces 100 LF of 6" ACP with 6" ductile iron pipe (DIP), and replaces a fire hydrant. Hydraulic analysis shows the abandonment of this water main has no adverse effects on fire flows within the area.
BENEFITS: The Wexford Avenue Abandonment eliminates an aging, parallel water main and reduces District maintenance.
Shannon Dr Abandonment
BACKGROUND: Shannon Dr has an existing 550 LF 6" asbestos cement pipe (ACP) that parallels an existing 8" ACP water main between Wexford Ave and Gellert Ct. This project abandons the existing 6" ACP and replaces 700 LF of the existing 8" ACP with 8" ductile iron pipe (DIP). The existing services originally located on the 6" ACP will be transferred to the new 8" DIP. Hydraulic analysis shows the abandonment of the 6" ACP has no adverse effects on fire flows within the area.
BENEFITS: The Shannon Drive abandonment eliminates a parallel water main, replaces aging infrastructure, and reduces District maintenance.
Vista Court Fire Hydrants
BACKGROUND: The existing 8" asbestos cement pipe (ACP) on Vista Ct has two dead ends: one side approximately 300 LF and the other side 500 LF. This project adds a fire hydrant on the southern alignment and relocates the existing hydrant on the northern alignment to the end of the water main. This will improve flushing capabilities and improve water quality.
BENEFITS: The Vista Court Fire Hydrants improves flushing capabilities and improves water quality.
Callan Blvd Zone 2 Loop Closure
BACKGROUND: Callan Blvd has a 450 LF 4" asbestos cement pipe (ACP) (Zone 3) dead end and a 300 LF 10" cross country (CC) ACP (Zone 2) immediately south of Greendale Dr and Georgetown Ct. The dead end is undersized and the CC water main has potential to damage Westborough Middle School in the event of a leak. These two water mains will be replaced with 800 LF of 12" ductile iron pipe (DIP) along Callan Blvd and Greendale Dr creating a Zone 2 loop in the area. Fourteen service connections will be transferred from Zone 3 to the new Zone 2 12" DIP. In addition, the 10" ACP along Georgetown Ct will be replaced with 8" DIP to improve seismic resiliency and improve water quality. Hydraulic analysis indicates fire flows within the area, especially along Georgetown Ct will remain nearly identical with 1,500 gpm at 44-50 psi. Those properties switching from Zone 3 to Zone 2 will see a static pressure decrease of ±40 psi from 85 psi to 45 psi.
BENEFITS: The Callan Blvd Zone 2 Loop Closure abandons CC water mains, eliminates undersized and aging dead end water mains, and improves seismic resiliency.
Westborough Park Abandonments Phase 1
BACKGROUND: Two 6" cross country (CC) asbestos cement pipes (ACP) exist between 1) Baldwin Hills Ct and Bettman Way and 2) Basset Ct and Gilbert Ct. Should breaks occur on these water mains, there is potential of property damage to homes, the park, and school downhill of the current location. This project abandons the existing CC water mains and to maintain system capacity and fire flows, the existing 6" ACP water mains on the above mentioned streets will be replaced with 8" ductile iron pipe (DIP). Hydraulic analysis indicates these improvements have no adverse affects on fire flows within the area.
BENEFITS: The Westborough Park Abandonments - Phase 1 eliminates CC water mains with potential to cause property damage during breaks, replaces aging infrastructure, improves seismic resiliency, and reduces District maintenance .
Greendale Dr Area Cross Country Abandonments
BACKGROUND: Two 6" cross country (CC) asbestos cement pipes (ACP) connect opposing streets of Greendale Dr: 1) 100 LF between Brunswick Ct and Crofton Way and 2) 100 LF between Bettman Way and Kent Way. Should a leak occur on these mains, there is potential of water damage to properties and the open space area. This project abandons the CC water mains however with the abandonment, each court becomes a new dead end. To maintain system and flow capacities and to improve seismic reliability in these areas, the existing 6" ACP will be replaced with 8" ductile iron pipe (DIP). Hydraulic analysis indicates minimal differences with the new configuration with all flow locations well above the 1,500 gpm at 20 psi recommendation. A water quality analysis also indicates frequent water turnover due to the amount of homes on each court.
BENEFITS: The Greendale Dr Area Cross Country Abandonments eliminates CC water mains, replaces aging infrastructure, reduces District maintenance, and improves seismic resiliency.
Greendale Dr Improvements Phase 1
BACKGROUND: Greendale Dr has 1 O" asbestos cement pipes (ACP) with the southern section terminating at the Greendale PRV to Zone 1 and the northern section terminating at a dead end just east of Geddes Ct with a blowoff. This project eliminates the dead end by installing 250 LF of 10" ductile iron pipe (DIP) and creates a loop on the eastern side of Greendale Dr. In addition, 250 LF of 8" ACP will be replaced with 10" DIP to eliminate the small 8" bottleneck when looping the area.
BENEFITS: The Greendale Dr Improvements - Phase 1 eliminates a dead end, provides system redundancy, improves water quality, and improves seismic resiliency.
Greendale Dr Improvements Phase 2
BACKGROUND: Parallel water mains exist throughout the District which may have served as terminus locations as the original Westborough subdivisions were built in the 1960s. These parallel mains serve no hydraulic purpose and most are dead ends creating water quality concerns. In addition they create additional maintenance for the District as two water mains within the same stretch of roadway. Greendale Dr between Bettman Way and Galway Dr is one such location with parallel 4" and 10" asbestos cement pipe (ACP) water mains. Currently all services are on the 4" ACP. This project abandons the 4" ACP, replaces the existing 10" ACP with a new a 10" ductile iron pipe (DIP) located in the street, and relocates the services and hydrants new 10" DIP.
BENEFITS: The Greendale Dr Improvements - Phase 2 eliminates parallel water mains, replaces aging and undersized water mains, and improves seismic resiliency.
Palos Verdes Way Improvements
BACKGROUND: Parallel water mains exist throughout the District which may have served as terminus locations as the original Westborough subdivisions were built in the 1960s. These parallel mains serve no hydraulic purpose and most are dead ends creating water quality concerns. In addition they create ongoing potential maintenance concerns for the District as two water mains have to be maintained in the same stretch of roadway. Palos Verdes Way is one such location with parallel 4" and 8" asbestos cement pipe (ACP) water mains. Currently all services are on the 200 LF 4" ACP and moving them to the aging 8" ACP is not feasible due to its location. This project abandons the 4" ACP, replaces 250 LF 8" ACP with 8" DIP, relocates services to the new 8" DIP and replaces a fire hydrant.
BENEFITS: The Palos Verdes Way Improvements eliminates parallel water mains replaces aging and undersized water main, and improves seismic resiliency.
Greendale Dr Zone 3 to Zone 2 PRV Improvements
BACKGROUND: Under normal operating conditions, the Skyline Tanks supply water to Zone 2. Two pressure reducing valves (PRY) located at 1) Greendale Drive and 2) Seafood Market connect Zone 3 to Zone 2 and are set to operate during emergency or low pressure conditions allowing water to flow from Zone 3 to Zone 2. The Greendale PRV is old, beyond its operational life, and is located in a deep, tight vault not conducive to maintenance operations. This project replaces the PRV and vault at the Greendale location and will also add SCADA functionality for remote monitoring.
BENEFITS: The Greendale Dr Z3 to Z2 PRV Improvements replaces aging infrastructure and improves maintenance operations.
Greendale Dr Zone 2 to Zone 1 PRV Improvements
BACKGROUND: The Skyline Tanks supply water to both Zones 2 and 1. Zone 1 does not have storage tanks and is supplied water through three Zone 2 pressure reducing valve (PRV) stations connecting Zones 2 and 1. These stations are located on 1) Gellert Ct on the south end of the District, 2) Greendale Dr at the north end, and 3) Westborough Blvd in the middle. The PRV's are old and beyond their operational life and are located in deep vaults with little room for maintenance operations. This project reconfigures the Greendale PRV Station by replacing the 8" PRV with a new 10" PRV, replacing the vault to make it more accessible, adding a flow meter to record flow into Zone 1, and adding SCADA functionality for remote monitoring.
BENEFITS: The Greendale Dr Z2 to Z1 Improvements replaces aging infrastructure, allows increased flow into Zone 1, allows flow monitoring, and improves maintenance operations.
Gellert Ct Zone 2 to Zone 1 PRV Improvements
BACKGROUND: The Skyline Tanks supply water to both Zones 2 and 1. Zone 1 does not have storage tanks and is supplied water through three Zone 2 pressure reducing valve (PRY) stations connecting Zones 2 and 1. These stations are located on 1) Gellert Ct on the south end of the District, 2) Greendale Dr at the north end, and 3) Westborough Blvd in the middle. The PRV's are old and beyond their operational life and are located in deep vaults with little room for maintenance operations. This project reconfigures the Gellert PRV Station by replacing the 8" PRV, replacing the vault to make it more accessible, adding a flow meter to record flow into Zone 1, and adding SCADA functionality for remote monitoring.
BENEFITS: The Gellert Ct 22 to 21 PRY Improvements replaces aging infrastructure, allows flow monitoring into Zone 1, and improves maintenance operations.
Wexford Ave Loop Closures
BACKGROUND: According to District maps and discussions with District personnel, a closed valve between Zones 1 and 2 at Wexford Ave / Dublin Dr intersection creates a dead end on Wexford Ave just west of Dublin Dr. Similarly, a closed valve between Zones 1 and 2 at the Gellert Blvd and Kenry Way intersection creates a dead end on Buena Vista Rd. This improvement will eliminate the dead ends and create loops in both zones: 1) a Zone 1 loop on Gellert Blvd between Kenry Way and Wexford Ave with 350 LF of 8" ductile iron pipe (DIP) and 2) a Zone 2 loop on Wexford Ave between Dublin Dr and Gellert Dr with 500 LF of 8" DIP. The existing 8" asbestos cement pipe (ACP) along Wexford Ave will remain to preserve the Zone 1 loop between Dublin Dr and Gellert Blvd. Hydraulic analysis indicates up to a 155% increase in residual pressures along Wexford Ave upon completion of this project.
BENEFITS: The Wexford Ave Loop Closures eliminates dead ends by creating loops in both Zones 1 and 2, improves residual pressures, provides system redundancy, and improves water quality.
Westborough Blvd Zone 2 Blowoffs
BACKGROUND: The 12" asbestos cement pipe (ACP) along Westborough Blvd is the primary transmission water main for the District moving water from the Westborough Pump Station to the Skyline Tanks. The same water main back-feeds Zones 2 and 1 from the Skyline Tanks. In the event of an emergency and/or a break in this main, Zones 2 and 1 will be out of water. The District can utilize the NCCWD and Daly City emergency interties to supply water into the zones through Zone 3 using the Greendale and Seafood Market PRVs. Installing 12" blowoffs approximately every 700 feet along Westborough Blvd, between Galway Dr and Callan Blvd, allows the District to move water by jumping from one blowoff to another using flexible hoses in case of prolonged outages due to water main failures.
BENEFITS: The Westborough Blvd Zone 2 Blowoffs allows the District to move water over sections of water main failures.
Westborough Blvd Transmission Blowoffs
BACKGROUND: The 14" asbestos cement pipe (ACP) along Westborough Blvd is the primary transmission water main for the District moving water from the SFPUC turnout to the Westborough Pump Station. In the event of an emergency and/or a break along this main, the District will be unable to pump water to Skyline Tanks. The District can utilize the NCCWD and Daly City emergency inter-ties to supply water into the zones through Zone 3 using the Greendale and Seafood Market PRVs. Installing 12" blowoffs approximately every 700 feet along Westborough Blvd, between El Camino Real and the Westborough Pump Station, allows the District to move water by jumping from one blowoff to another using flexible hoses in case of prolonged outages due to water main failures.
BENEFITS: The Westborough Blvd Transmission Blowoffs allows the District to move water over sections of water main failures.
Westborough Blvd Zone 1 & 2 PRV Improvements
BACKGROUND: The Skyline Tanks supply water to both Zones 2 and 1. Zone 1 does not have storage tanks and is supplied water through three Zone 2 pressure reducing valve (PRV) stations connecting Zones 2 and 1. These stations are located on 1) Gellert Ct on the south end of the District, 2) Greendale Dr at the north end, and 3) Westborough Blvd in the middle. The Westborough Blvd PRV is located approximately 750 LF west of Gellert Blvd just behind the sidewalk in a heavily vegetated area with no safe parking area. In addition, the Zone 1 water mains exiting the station which feed the area along Galway Dr and below are located in steep, cross country (CC) terrain with very large trees making it difficult for maintenance and repairs. Should a break occur on the Zone 1 water mains, there is potential of significantly damaging the office complex below. This project abandons the Westborough PRV station and installs 2 new more-accessible PRV stations at 1) Westborough Blvd / Galway Dr intersection and 2) along Dublin Drive. Lastly, upon abandonment of the CC water mains, the 12" asbestos cement (ACP) water main along Liberty Ct will be replaced with 8" ductile iron pipe (DIP) to alleviate water quality concerns and to improve seismic resiliency.
BENEFITS: The Westborough Blvd 22 to 21 PRV Improvements relocates the existing PRV station to a more accessible location, removes CC water mains, replaces aging infrastructure and improves seismic resiliency.
Westborough Park Abandonments - Phase 2
BACKGROUND: An 8" cross country (CC) asbestos cement pipe (ACP) exists in Westborough Park which begins at the Galway Dr / Unwin Ct intersection and continues approximately 600 LF CC through the park and dead ends behind Gilbert Ct. It is believed this main was originally installed for a possible future development adjacent to the park which will never move forward per the District. There is also a 200 LF 6" ACP that branches off the 8" ACP serving two customers and a hydrant. This project will abandon both the 6" and 8" ACPs located in Westborough Park, replace 350 LF of 10" ACP with 10" ductile iron pipe (DIP), and relocate the two service connections and fire hydrant to the new 10" DIP along Galway Drive.
BENEFITS: The Westborough Park Abandonments - Phase 2 eliminates a long CC dead end water main, improves water quality, and reduces District maintenance and liability in the event of a break.
Avalon Dr / Seville Way Improvements
BACKGROUND: The lower portion of Avalon Dr and Waverly Ct is supplied water from two directions: 1 ) a 450 LF 8" asbestos cement pipe (ACP) water main along Seville Way and 2) a 700 LF cross country (CC) 8" ACP water main between Avalon Drive and Appian Way. To provide redundancy along Waverly Ct, there is also an existing 200 LF 8" CC ACP connecting the end of Waverly Ct with Avalon Dr. The 8" CC ACP between Avalon Dr and Appian Way is located in very steep terrain and runs adjacent to homes both at the top and bottom. This water main is nearly inaccessible and should a break occur on the alignment, repairs would prove difficult in addition to potential water damage to downhill properties. This project abandons the 700 LF 8" CC ACP and to ensure the area maintains it's one direct feed from Valley View Way, the existing 450 LF of 8" ACP will be replaced with 8" ductile iron pipe (DIP) along with relining the 200 LF 8" CC ACP. This project also includes abandoning a 160 LF of 6" ACP serving only 1 resident and replaces it with a long service. Hydraulic modeling indicates fire flows will remain above 1,500 gpm with pressures in the range of 85 psi, well above the minimum 20 psi recommendation.
BENEFITS: The Avalon Dr / Seville Way Improvements abandons an existing CC and low service water main, rehabilitates existing pipe, improves seismic resiliency to the backbone of the area by replacing ACP with new DIP.
Gellert Blvd Ridge Improvements
BACKGROUND: The ridge above Gellert Blvd has several 6" cross country (CC) asbestos cement pipe (ACP) water mains connecting several dead end courts off Galway Dr and Radburn Dr including: Unwin Ct, Wright Ct, Wren Ct, Williamsburg Ct, Williams Ct, and Westchester Ct. Should breaks occur on these water mains, there is a potential of damaging the downhill development including the 30 ft high retaining wall in addition to significant hillside erosion. This project will abandon the CC water mains and to maintain system and fire flow capacities, the existing 6" ACPs along the courts will be upsized to 8" Ductile Iron Pipe (DIP). In addition, a small section of 10" ACP will be replaced with 10" DIP at the Rowntree Way/Gellert Blvd intersection to improve configuration. Hydraulic analysis indicates fire flows will remain similar to pre-abandonment conditions.
BENEFITS: The Gellert Blvd Ridge Improvements eliminates 4 CC water mains, replaces aging infrastructure, and improves seismic resiliency.
Galway Drive Improvements
BACKGROUND: Galway Dr at the intersections of Williamsburg Ct and Radburn Dr does not have any in-line valves to isolate small sections of water main during shutdowns. There is also an unused existing dead end pipe directly across Williamsburg Ct. This project reconfigures the area to add additional valves to allow various shutdown scenarios in addition to abandoning the dead end water main and replacing a fire hydrant.
BENEFITS: The Galway Drive Improvements adds additional valves to the area to permit various shutdown alternatives, replaces an existing fire hydrant, and abandons an unused dead end water main.
Westborough Pump Station Improvements
BACKGROUND: Westborough Pump Station pumps water to the Skyline Tanks through Zone 2 but it is also designed to pump water to Zone 1 for a future Zone 1 tank. However, the area within the District boundary is fully developed and there is no land available for building any tanks making the additional Zone 1 piping at the pump station obsolete. This project will abandon the Zone 1 pipe configuration along with all its valves, check valves and pipes in the pump station and will create a extra space to be used as a storage area.
BENEFITS: Improvement of water quality by abandoning the Zone 1 pipes and improved flushing capabilities for the supply line.
Inline Water Valves
BACKGROUND: The District is limited in isolating shorter sections of water main during shutdown operations due to existing valve locations. This project involves the installation of new inline valves throughout the system between pipe intersections and at intersections allowing the District to isolate smaller lengths of main for emergency repairs. This will also reduce the amount of residents affected by shutdowns.
PROJECT BENEFITS: The lnline Water Valves project reduces the amount of customer disruptions during repairs and emergency events.
Office Remodel & Expansion Phase 1
BACKGROUND: The District's main office building located at 2263 Westborough Blvd. is approximately 2,700 square feet, but only half of it is used as an office. The other half is used for the main pump station and parking garage. This project will add approximately 300 SF to the existing building, which can be used for staff office and storage space. This project is split into two phases: 1) a space analysis by an architect to optimize the layout of the building and propose any additions, and 2) construction.
BENEFITS: Adds additional office and storage space to the existing office building.
Skyline Tank No. 3
Skyline Tank No. 3 exterior walls are showing signs of corrosion from the wind and ocean. This project consists of recoating the interior and exterior of the tank, appurtenance improvements to increase tank reliability, and a new drain outlet.
PROPOSED IMPROVEMENTS
• Structural improvements to withstand the design level earthquake
• Recoat the entire tank exterior and interior roof
• Various appurtenance upgrades
PROJECT BENEFITS
The Skyline Tank No. 3 Improvements protects and extends the tank's service life, ensures tank integrity following the design level earthquake, provides tank isolation during a seismic event, and reduces water waste.
Athy Drive Water System
This project is to eliminate a cross country 8" asbestos cement pipe (ACP) which exists between Athy Drive, Carter Drive, and Meath Drive at and near the Skyline Village Subdivision. Click on map for larger detail.
PROPOSED IMPROVEMENTS
• Abandon 1,000 LF ACP
• Replace 150 LF of 2" PVC with 300 LF 6" DIP
• Replace 400 LF of 6" and 8" ACP with 8" DIP
• Replace 600 LF of 12" ACP with 12" DIP
• Relocate meters
• Replace 5 fire hydrants (2 Private and 3 Public)
PROJECT BENEFITS
The Athy Drive Improvements eliminates a CC water main, replaces aging water mains, and reduces District maintenance. The private water system will be maintained by Skyline Village.
Westborough Sanitary Sewer Lift Station
The valves are old and operation is becoming difficult and replacement is recommended. Automatic Transfer Switch and Motor Control Center also require replacement. The Westborough Sewer Pump Station Improvements decreases the risk of pump failure and down time.
Rowntree Sanitary Sewer Lift Station
The valves are old and operation is becoming difficult and replacement is recommended. The Automatic Transfer Switch also requires replacement. The Rowntree Sewer Pump Station Improvements decreases the risk of pump failure and down time.
Rowntree Pump Station Structural Analysis / Repair
Rowntree Pump Station is located along the northwest side of Gellert Blvd. directly across Rowntree Way. The pump station is a precast concrete structure built into the hillside with a concrete roof, rear and side walls dueling as retaining walls with the front exposed to the parking lot. There is also a wet well located directly behind the pump station between the building and sidewalk along Gellert Blvd. The pump station is accessed from the shopping center parking lot to the south. Over the years, the joint between the concrete roof and back wall has been leaking during rain events or when the wet well is full. It is also not known when the last structural analysis was performed on the building. This project involves performing a structural analysis of the building in addition to repairing the leak.
Avalon Sewer Pump Station Improvements
The Motor Control Center (MCC) panel and associated outdoor cabinet will be redesigned and replaced as they are in very poor condition. The Avalon Sewer Pump Station Improvements decreases the risk of pump failure and down time.
Westborough Blvd. Phases 1-3 Sanitary Sewer Improvements
One of the District's primary sanitary sewer (SS) mains, a vitirified clay pipe (VCP) varying between 6" and 10", runs along Westborough Blvd for approximately 4,100 LF between Skyline Blvd and the Westborough Pump Station located adjacent to the District office. In 2017, CCTV video determined the pipe showed a high frequency of internal defects including circumferential and longitudinal cracks, fractures, broken pipe, root intrusion and root balls, offset and separated joints - with some very severe. Although some sections of main have minor to no defects, the entire pipe should be replaced holistically. Due to it's length, replacement is recommended over three separate phases.
Phase 1 replaces ±1,640 LF of deteriorating sanitary sewer main greatly reducing future maintenance and extending overall system life. Phase 2 replaces ±1,500 LF. Phase 3 replaces ±1,920 LF. For budgeting purposes, this project assumes open-trench construction and replacement with polyvinyl chloride (PVC).
Shannon Dr. & Vicinity Phases 1-3 Sanitary Sewer Improvements
Shannon Dr has ±5,400 LF of 6" and 8" vitrified clay pipe (VCP) sanitary sewers (SS) serving ±180 residents. In addition, 6 shorter sewer mains located on Olympic Dr, Wentworth Dr, Turnberry Dr, St. Cloud Dr, Orrey Way and Albright Way, collectively called "Vicinity", all connect to Shannon Dr over a total 1,100 LF of 6" VCP SS. In 2017, CCTV video determined the pipe showed a high frequency of internal defects including circumferential and longitudinal cracks, fractures, broken pipe, root intrusion and root balls, offset and separated joints - with some very severe. Although some sections of main have minor to no defects, all pipe should be replaced holistically. Due to it's length, replacement is recommended over three separate phases.
Phase I replaces ±2,100 LF of deteriorating sanitary sewer main greatly reducing future maintenance and extending overall system life. Phase 2 replaces replaces ±2,260 LF. Phase 3 replaces ±2, 180 LF. For budgeting purposes, this project assumes open-trench construction and replacement with polyvinyl chloride (PVC).
Oakmont Dr. Sanitary Sewer Improvements
Oakmont Dr has ±1,060 LF of 6" vitrified clay pipe (VCP) sanitary sewers (SS) serving ±34 residents. In 2017, CCTV video determined the pipe showed a high frequency of internal defects including circumferential and longitudinal cracks, fractures, broken pipe, root intrusion and root balls, deposits, grease, and offset joints - with some very severe. Although some sections of main have minor to no defects, all pipe should be replaced holistically. This project replaces the existing sewer main in addition to replacing/rehabilitating laterals and manholes. For budgeting purposes, this project assumes open-trench construction and replacement with polyvinyl chloride (PVC).
The Oakmont Dr Sanitary Sewer Improvements replaces ±1,060 LF of deteriorating sanitary sewer main greatly reducing future maintenance and extending overall system life.
Bantry Ln. Sanitary Sewer Improvements
Bantry Ln. has ±1,200 LF of 6" vitrified clay pipe (VCP) sanitary sewers (SS) serving ±44 residents. In 2017, CCTV video determined the pipe showed a high frequency of internal defects including circumferential and longitudinal cracks, fractures, broken pipe, seal ring protrusions, and offset/separated joints - with some very severe. Although some sections of main have minor to no defects, all pipe should be replaced holistically. This project replaces the existing sewer main in addition to replacing/rehabilitating laterals and manholes. For budgeting purposes, this project assumes open-trench construction and replacement with polyvinyl chloride (PVC).
The Bantry Ln. Sanitary Sewer Improvements replaces ±1,200 LF of deteriorating sanitary sewer main greatly reducing future maintenance and extending overall system life.
Ardee Ln. Sanitary Sewer Improvements
Ardee Ln. has ±1, 180 LF of 6" vitrified clay pipe (VCP) sanitary sewers (SS) serving ±41 residents. In 2017, CCTV video determined the pipe showed a high frequency of internal defects including circumferential and longitudinal cracks, fractures, broken pipe, seal ring protrusions, and offset/separated joints - with some very severe. Although some sections of main have minor to no defects, all pipe should be replaced holistically. This project replaces the existing sewer main in addition to replacing/rehabilitating laterals and manholes. For budgeting purposes, this project assumes open-trench construction and replacement with polyvinyl chloride (PVC).
The Ardee Ln. Sanitary Sewer Improvements replaces ±1, 180 LF of deteriorating sanitary sewer main greatly reducing future maintenance and extending overall system life.
Tara Ln. Sanitary Sewer Improvements
Tara Ln. has ±1,060 LF of 6" vitrified clay pipe (VCP) sanitary sewers (SS) serving ±34 residents, In 2017, CCTV video determined the pipe showed a high frequency of internal defects including circumferential and longitudinal cracks, fractures, broken pipe, deposits, and offset/separated joints - with some very severe, Although some sections of main have minor to no defects, all pipe should be replaced holistically, This project replaces the existing sewer main in addition to replacing/rehabilitating laterals and manholes, For budgeting purposes, this project assumes open-trench construction and replacement with polyvinyl chloride (PVC).
The Tara Ln. Sanitary Sewer Improvements replaces ±1,060 LF of deteriorating sanitary sewer main greatly reducing future maintenance and extending overall system life.
List of Future Potential Capital Improvement Projects
A list of future, potential water capital improvement projects can be downloaded here (PDF).
A list of future, potential sewer capital improvement projects can be downloaded here (PDF).
The District is working on conducting a Rate and Fee Study to address these long lists of about $38 million worth of potential water projects and about $43 million worth of potential sewer projects. Currently, the District has been working on the most important projects first, using the "Pay-As-You-Go" Budget Rule to pay for these projects. The District is assessing the need to accelerate the Capital Improvement Program and looking for ways to finance them.