The project will be in the City of San Bruno, which is located in Northern San Mateo County, in the “West Bay” sub-region as identified in the Bay Area IRWMP. The new municipal groundwater well and treatment system will be located on a City-owned parcel at the corner of Mariner Drive and Commodore Drive. The City overlies DWR Basin (2-35), the Westside Groundwater Basin.
This Project includes the development and use of
groundwater as a new source of supply for the City of San Bruno through the design
and construction of a new municipal groundwater supply well and treatment
system. It is anticipated that this project could deliver approximately 800 acre
feet per year (AFY) of additional high-quality water supply to the City and
allow the City to meet the terms of the Westside Basin Groundwater Storage and
Recovery Project (GSR) Agreement, which provides drought benefits to the entire
West Bay sub-region.
Implementation of this Project will provide the
following benefits locally and regionally: (1) Immediate drought preparedness, (2) Increased local water supply
reliability and the delivery of safe drinking water, (3) Groundwater
management, (4) Improvement of water quality, (5) Drinking water treatment
and distribution, and (6) Increased resilience to climate change.
Drinking Water Supply
Water Quality Improvement
Habitat Protection and Restoration
DRINKING WATER SUPPLY: This project will add approximately 800 AFY of potable water to the City's water supply portfolio. This will increase and diversify the supply available to the City, including during droughts or other supply interruptions. This Project is also critical to the successful operation of the Westside Basin GSR Project, which is a critical drought relief project for the region.
WATER QUALITY IMPROVEMENT: The treatment system that will be developed to treat the produced groundwater will ensure that the groundwater that enters the City's water distribution system meets all primary and secondary MCLs.
GROUNDWATER BENEFITS: The City currently manages its surface and groundwater sources conjunctively, both locally and regionally as part of the South Westside Basin Groundwater Management Plan (GWMP) and the Westside Basin GSR Project. Development of this Project will assist the City to continue to do that in a cost-effective manner.
Part 2 - Detail
This Project will develop local groundwater resources for conjunctive
use to increase public safety, diversify the City’s supply portfolio, provide
drought relief, and increase supply reliability to the City and the region. The City has one of the lowest residential
per capita water uses in the State (48 R-GPCD), which makes drought cutbacks
difficult to achieve. This Project will increase the City’s water supply by as
much as 800 AFY, allow the City to contribute to the Westside Basin GSR
Project, and make the City and region more resilient to drought cutbacks.
Project includes the design and construction of a new municipal groundwater supply
well and treatment system. This Project will
deliver 800 AFY of treated water to the City. Implementation of this
Project will diversify the City’s water portfolio, improve drinking water
supply reliability, provide drought relief, and better allow the City to meet
the health and safety needs of its water-efficient residents now and in the future, as well as benefit the region as part of its
participation in the Westside Basin GSR Project.
Readiness to Proceed
City initiated work on this Project in 2013. To date, the City has retained
technical consulting assistance for the design and construction of the well and
treatment system, acquired land, drilled a pilot hole to log stratigraphy, constructed
a monitoring well, conducted water quality sampling, and completed a CEQA
analysis. The City is planning to issue
bid documents for the well in Spring 2015, and will begin construction by Fall
2015. Following construction and testing of the well, the City will initiate design
and construction of the treatment system, with Project completion anticipated
in December 2016.
Project will produce 800 AFY of high-quality water for potable use. The Project
will function as a lower cost, supplemental source of supply to the City which
will aid the City to balance its use of surface water during normal and drought
years, supply an additional source of water into the City’s distribution system
to meet demands in three different pressure zones, increase the City’s
resilience to supply disruption and climate change impacts, and ensure that the
demands of the City’s customers can be reliably met. This Project will also
increase the region’s drought reliability through the City’s participation in
the Westside Basin GSR Project.
City is committed to continuing to work with stakeholders in the Westside Basin
and the region to effectively manage the basin, including the development and
implementation of management and monitoring programs in conformance with
current State laws and local agreements, including those for the implementation
of the 2012 South Westside Basin GWMP, the Westside Basin GSR Project, and
future actions to be taken in response to the Sustainable Groundwater
Management Act. Specifically, the
entities that the City has been coordinating with include: the Bay Area Water
Supply and Conservation Agency (BAWSCA); San Francisco Public Utilities
Commission (SFPUC); Daly City; South San Francisco; and other stakeholders.
LOCAL DROUGHT RELIEF AND WATER SUPPLY NEED:
Currently the City’s customers use approximately 48 R-GPCD, which means
that during a significant drought and cutbacks to its surface water supply,
they have limited ability to reduce their consumption. The construction of this well will provide the
City with a supplemental source of supply which will create a buffer for the
City during droughts, such as the one that we are currently experiencing. Further,
since the City will have an alternative supply that it can rely on during
normal and drought years, this Project will reduce the City’s reliance on surface
water, which benefits the region and the Delta, and increase the City’s
resilience in the face of climate change.
REGIONAL DROUGHT RELIEF NEED:
The City is a participant in the Westside Basin GSR Project, which is a
7.4 MGD drought-relief project that increases the supply reliability for the
entire Hetch-Hetchy system, including for all the BAWSCA agencies. The GSR Agreement requires the City to pump 3,350 AFY at an average rate of 2.1 GPM
during dry years in order to provide drought benefit to the region (i.e., when
SFPUC declares a drought, the City is required to use groundwater in lieu of
taking surface water from the Hetch-Hetchy system, which then frees up surface
water for other system users). Without this Project, the City will not have the
capacity to produce sufficient groundwater, which will impact the drought
reliability of the region.
WATER SYSTEM RELIABILITY NEED:
As was evidenced during the 2009 explosion of the PG&E gas pipeline
in the City, which shut-down water service to a portion of the City, and the
recent water quality incident on the Hetch-Hetchy system wherein untreated
water was delivered to many utilities in the region, the City will benefit from
a supplemental source of supply that can act as an additional source of supply
during an emergency or other supply interruption from the Hetch-Hetchy
system. This Project will provide
highly-treated water to multiple pressure zones within the City, greatly
increasing operational flexibility and system redundancy and reliability.
WATER QUALITY NEED:
Groundwater produced from the Westside Basin tends to have elevated
levels of iron and manganese. Therefore, in order to deliver groundwater to its
customers for potable use, the City will have to design, construct and operate
a treatment system.
Currently the cost to purchase water from the Hetch-Hetchy system is approximately
$1,900 per acre-foot. In contrast, groundwater from this Project will cost
approximately $400 per acre-foot to produce, achieving a much more
cost-effective water supply solution for the City. Over 20 years, this Project will save the City $24,000,000. Furthermore, without this
Project and the ability to conjunctively use groundwater locally and as part of
the Westside Basin GSR Project, the City and the region will suffer significant economic
impacts during drought.
Local Water Supply / Drought Relief Impact
If this Project is not implemented the City
will remain vulnerable to drought, which will have significant economic and
other impacts. The City will also be
vulnerable to supply interruptions or water quality breaches on the
Regional Drought Impact
this Project, the City will not have the capacity to produce the amount of
groundwater that it is required to do under the Westside Basin GSR Project Agreement,
which will impact the drought reliability of the region and have a major economic
The City will be negatively impacted
economically as the cost to purchase water from the Hetch-Hetchy system is significantly
more expensive than the cost to produce groundwater (i.e., currently the cost to
purchase water from the Hetch-Hetchy system is approximately $1,900 per
acre-foot, while groundwater costs approximately $400 per acre-foot to produce). Over 20 years, this Project will save the City $24,000,000. Further, to the extent that the Westside Basin GSR Project is not able to
effectively function due to the City’s lack of production capacity, there will
be significant economic impacts to the region.
adding an additional, local and drought-proof supply source, this Project immediately
achieves the following benefits locally (and by extension to the region) that
are consistent with State and regional priorities:
Immediate Drought Preparedness
Project increases the City’s water supply portfolio by 800 AFY to include
a more drought-proof groundwater source that will benefit the City’s customers
that currently use 48 R-GPCD. Further, this Project ensures that the City can
meet the terms of its Westside Basin GSR Agreement, which requires the City to
pump 3,350 AFY at an average rate of 2.1 GPM during dry years in order to
provide drought benefit to the region (i.e., when SFPUC declares a drought, the
City is required to groundwater in lieu of taking surface water from the
Hetch-Hetchy system, which then frees up surface water for other users of the
local water supply reliability and the delivery of safe drinking water
adds 800 AFY of treated groundwater to the City’s available supplies.
the implementation of the South Westside Basin GWMP and the Westside Basin GSR
Project, the City continues to work with other basin users to manage the
Westside Basin and to provide drought benefits locally and to the region.
Improvement of Water Quality
By adding a groundwater treatment system, the
City will be able to tap into an underutilized resource and distribute
high-quality water to its customers.
water treatment and distribution
By adding wellhead treatment, the City will
have access to 800 AFY of treated groundwater that meets all MCLs that can be
served within three pressure zones within the City.
Increases Water Supply Reliability
Advances/ Expands Conjunctive Management of Multiple Water Supply Sources
Increases Water Use and/or Reuse Efficiency
Provides Additional Water Supply
Promotes Water Quality Protection
Reduces Water Demand
Advances/Expands Water Recycling
Promotes Urban Runoff Reuse
Addresses Sea Level Rise
Addresses other Anticipated Climate Change Impact (e.g. through water management system modifications)
Improves Flood Control (e.g. through wetlands restoration, management, protection)