Friday, June 23, 2017

Building Dams in Earthquake Regions Part I

The First Two Calaveras Dams

As Californians, we live with the possibility of earthquakes.  Here at the Calaveras Dam Replacement Project, we are constructing a new earth and rock-fill dam that will be strengthened to resist the seismic forces and withstand a 7.25 magnitude earthquake. 

Dam technology has evolved since we completed the original dam in 1925. In a two-part series, we’re going to take a look at how our predecessors built the previous Calaveras Dam, which has served us well for 90 years, and what new technologies and construction methods we are using for the new dam to be ready for the next big quake.

The original Calaveras Dam (construction spanned 1913 to 1918) was constructed using the so-called hydraulic fill method.  Basically, to create the impermeable 'puddle core', fine soils were washed off the surrounding slopes with high pressure water cannons, and this slurry was collected between two 'training' dikes on both sides of the dam’s core.

During gold mining in the Sierra foothills, this method was used to build much smaller dams to impound water for hydraulic mining. But scaling this method up to this size had some serious problems. 

The first Calaveras Dam, nearly complete in 1918. It was the largest earthen dam in the world at the time.

The process did not allow excess water in the puddle core to dissipate, and this extra weight exceeded the ability of the upstream shell to retain it, and it failed as it neared completion.

The second (current) dam was completed in 1925 and was built on the remains of the first dam. For the current dam, soil was compacted in the core, primarily by running heavily-loaded wagons over it (pulled by mules). In this photo you can see the mule trains compacting the core.

The second Calaveras Dam, shown in 1926.

However, one problem that wasn't addressed during the construction of the current dam was the fact that alluvial soils (creek sediments including silt, sand, and gravel) were not removed before the first dam was constructed. Such saturated, loose sediments, which are removed during the construction of a modern dam, have the potential to 'liquefy' as they are shaken during an earthquake. 

It was for this reason that we at the SFPUC elected to build a completely new dam next to the existing dam.  And this time, things were different. 

Stay tuned to learn more!

Friday, June 16, 2017

Bald Eagle Photo Friday at San Antonio Reservoir

Happy Photo Friday!

This week’s pick comes courtesy of Kevin and Pat from our Natural Resources and Lands Management staff.

We have spent a lot of time writing about the nesting pairs of bald eagles who reside at Calaveras Reservoir and the pair near our restoration sites near San Antonio Reservoir in the SFPUC-owned Alameda Creek Watershed. But we’d like to introduce you to a more recent arrival to the San Antonio Reservoir area.   

This pair has made its home closer to our Turner Dam at San Antonio Reservoir.  Since it is the time of year when our pairs are on their nests taking care of chicks, our staff spotted two eaglets in their nest.

Once bald eagles find a nesting location they like, they tend to stay in the area. Which is why these bald eagles and our Natural Resources and Lands Management staff have gotten to know one another.  Our staff monitors the well being of these birds on a weekly basis. They all have been trained on bald eagle monitoring and behavior. Knowing these particular birds and bald eagle behavior enables our Natural Resources staff to know quickly if the birds seem ‘off’ because they have been disturbed by something.  

These little ones will fledge (develop the ability to fly) anywhere from 8 to 14 weeks of age. For now, they’re being fed a consistent diet of fish found in the reservoirs and creeks within the Alameda Watershed.

Healthy watersheds provide high quality water and also provide a safe haven for many amazing plants and animals. We consider it an honor and a privilege to look after these watershed lands, and all who live there, too.

Have a wonderful weekend, everyone!

Thursday, June 8, 2017

Sunol Valley Fire Safety #1

It’s always fire season in California, although it officially begins in May. Our warm and dry climate coupled with climate change has made California more susceptible to frequent wildfires.  According to CAL FIRE, between January 1, 2017 and May 20, 2017 there have been a total of 921 fires in California.

Here at Calaveras dam want to prevent wildfires by our watersheds. During the summer months we will be dedicating a series of fire prevention blogs with tips on how you can help prevent forest fires.

Today we will focus on equipment safety.  Operating equipment like lawn mowers, chainsaws and tractors improperly could ignite a wildfire.  However, according to CALFIRE there are simple steps that you can take to prevent these types of fires.

(Image courtesy of

Equipment Safety Tips:
·       Mow during the cool time of day before 10 a.m. while there is still dew on the ground, not during the day and especially not when the wind is blowing.
·      Remove rocks and metal from the year that could be hit by the mower and cause sparks. 
·       Use a weed eater with a plastic line when cutting dry grass not a lawn mower (use lawn mower on green grass only).
·       Don’t top off fuel tanks.
·       Make sure spark arrestors are in proper working order and there is no carbon build up.
·       When transporting tractors, mowers, and recreational vehicles make sure that chains on the trailers are not hitting the pavement as you are driving.
·       Take special care when using tractors in dry grass that can easily ignite. 
·       Last but not least, always have a least one of the following items with you: fire extinguisher, water supple or a shovel.

Wildfires have an effect on watersheds, reservoirs, and the quality of our drinking water. 
By protecting our watersheds we are protecting our environment. Remember metal
blades hitting rocks can spark a fire!

For more information on wildfires go to:

Friday, May 26, 2017

Blankets and Curtains for Calaveras Dam?

Here at the Calaveras Dam Replacement Project we are building what is called an earth and rock-fill dam. The replacement Calaveras Dam, like all so-called embankment dams, is made of mostly compacted earth (see a cross section of the future dam below). An important aspect of this type of dam is the management of water. All earthen dams leak, the important thing is to control where the water flows to protect the integrity of your dam.  In the case of the Calaveras Dam Replacement project, we accomplish this with blankets and curtains. 

No fooling! Here’s how it works.  For years, the crews onsite have been constructing an entire dam that extends more than 100 feet below the base of the future dam.  We call this a grout curtain. Grout for those of you not in the construction industry is a special mix of cement that can be injected or literally blown onto a surface to seal it.  

Grout Curtains

As you can see in the photo from 2015, crews drilled countless small diameter holes into the bedrock a hundred feet down below the future dam and injected the holes with pressurized grout. The grout effectively seals up cracks and fractures within the rock underneath the new dam.  We did this for years. Why is this grout curtain so important? It prevents water from seeping underneath the new dam and undermining it.  In essence we drilled an entire new dam underneath the future dam. 

Drainage Blanket

If you thought grout curtains alone were enough to protect the future Calaveras Dam, guess again! We need blankets, too. More specifically a drainage blanket. The drainage blanket prevents water from exiting to, and damaging, the down-stream face of the dam (the face of the dam away from the reservoir).  At the end of the drainage blanket we are constructing a ‘mini dam’ made out of the same clay material as the core to capture any water in the drainage blanket. You can see the drainage blanket being constructed here.  This ‘mini dam’ is also known as the seepage barrier.  This seepage water is then collected in an inspection well to monitor the condition of the dam.

The Calaveras Dam Replacement Project, along with its blankets and curtains, is more than 80% complete.

See you around the Valley!

Friday, May 19, 2017

Photo Friday at the Calaveras Dam Replacement Project

Did you ever look at a photo of yourself or a family member from a long time ago and compare it to a recent picture? For today’s Photo Friday, we decided to do just that for the Calaveras Dam and its replacement.

Calaveras Dam in 2011. The project groundbreaking was in 2011. 

Calaveras Dam in April 2017. The project is more than 80% complete. We have moved more than 8 million cubic yards of rock and soil to date. We have fully excavated and grouted the left and right abutments. And in the center of the picture, the core of the new Calaveras Dam begins to take shape.  The huge concrete spillway (as wide as a freeway) is visible at the lower right. Wow.

Construction on this project started in 2011 and is expected to be complete in April 2019.

To learn more about this project and see a time lapse video of all of this excavation, visit us here.  

See you around the Valley!

Friday, May 12, 2017

Photo Friday for the Birds

While this author spent time in the Sunol Valley this week, she spied an amazing bird. 

Sitting atop the construction fencing that keeps small (crawling) critters out of the construction site, was a bird with flaming yellow plumage accented with black.

This striking fellow (and yes it is a male, the females are much more subdued in color) is a Bullock's orioleThe Alameda Watershed is home from spring through summer to Bullock’s orioles, like this first-year male. They'll winter in Mexico or Central America before migrating north again next spring.

They dine on insects, fruit, and raid the occasional humming bird feeder for the nectar. 

See you around the Valley!

Thursday, May 4, 2017

Honoring Construction Safety Week in the Sunol Valley

With so much heavy construction work underway in the Sunol Valley, it is easy to forget that the men and women in the construction industry perform dangerous work often in difficult conditions to upgrade the Hetch Hetchy Regional Water System.

It is a good thing that the construction teams working on the two projects in full swing in the Sunol Valley keep safety in mind every single day.  However, this week was a little different. The teams at the Calaveras Dam Replacement Project and the Fish Passage Facilities within the Alameda Creek Watershed underwent additional trainings and reminders this week.


The first week of May is National Construction Safety Week.  Global construction industry leaders, including our contractors, joined together to form industry safety forums and an initiative called ‘Safety Week.’ The mission of Safety week is to raise awareness within the construction industry ensuring “We are Stronger and Safer Together.”

How strong?

Here in the Sunol Valley, the number of recordable workplace incidents is well below the industry average. At our Fish Passage Project, workers have clocked in over 70,000 work hours since April 2016 with zero recordable incidents.  At the Calaveras Dam Project, the largest project in the Water System Improvement Program has worked over 220,000 work hours since July 2016 with zero recordable incidents. 

Working in heat and rain, on large earth-moving equipment or in tight spaces next to a creek, our crews are showing that every week is safety week.

We are proud of our teams out in Sunol Valley! Stay safe out there.

Crews overseeing operations at the future Fish Passage Facilities

Center of photo shows construction crews at Calaveras Dam placing
Clay Core materials in the replacement dam at elevation 567 ft 

Friday, April 28, 2017

Butterflies, Gates and Sleeves, Oh, My!

What do butterflies, gates, cones, balls, and sleeves have in common?

They are all types of valves used to control the flow of water through pipelines.  Instead of our usual Photo Friday, we thought we’d take the time to honor this under- appreciated, but extremely important, feature in our water system.  For the record, a valve is a mechanical device that blocks a pipe either partially or completely to change the amount of fluid that passes through it. And we at the SFPUC couldn’t operate much in the Hetch Hetchy Regional Water System without them.

Here at the Calaveras Dam Replacement Project, we are installing all sorts of  valves to control the flow of water from Calaveras Reservoir for different purposes. Each valve is specially designed to control water in a specific way without damage to the surrounding pipeline. So, let’s geek out about valves!

ButterflyA butterfly valve is a disk that sits in the middle of a pipe and swivels sideways (to admit fluid) or upright (to block the flow completely). It can also open partially to carefully calibrate the amount of water flowing through the pipe.

We are using a 48-inch diameter butterfly valve to control the flow of water to a temporary supply line for the Sunol Water Treatment Plant.

The Sleeve. The Bailey valve sleeve valve reduces water pressure and controls flow by diverting the water through multiple holes located within the sleeve and discharging to the atmosphere or a body of water. The valve controls flow by sliding one pipe called the gate over another pipe called the sleeve.

One of the Bailey sleeve valves installed in the building that will provide a steady stream of water to Calaveras Creek.

The Ball. In a ball valve, a hollowed-out sphere (the ball) sits tightly inside a pipe, completely blocking the fluid flow. When you turn the handle, it makes the ball swivel through ninety degrees, allowing the fluid to flow through the middle of it.  

These serve a similar purpose as the butterfly valve to calibrate the amount of flow.

The Cone. The body of the fixed cone valve is a tube with a cone in the end welded with some grooves.  Another tube acts as the closure member. This slides over the body groves in a linear movement to regulate until making contact against the seat of the cone when the valve is fully closed. 

This valve is not unlike your bathroom faucet, only in our case, a whole lot larger.

The fixed cone valve is used to discharge water at high pressure from reservoirs or full pipes into the atmosphere.  The flow towards the exit of the valve is not converging so that the discharge is in the shape of a hollow jet. 

The fixed cone valve at Calaveras Dam in operation January 2017.

The Gate. Gate valves open and close pipes by lowering metal gates across them. Most valves of this kind are designed to be either fully open or fully closed. Meaning, unlike the butterfly or ball valves, gate valves tend not to provide controlled flows of water, but either turn the flow completely on or completely off.

Two of the gate valves installed in the water supply discharge line from Calaveras Reservoir.

See you around the Valley!

Wednesday, April 12, 2017

Spring Wildflower Festival Draws Crowds to Sunol Regional Wilderness

This past weekend, the San Francisco Public Utilities Commission (SFPUC) joined an estimated 1,000 attendees at the 2017 Spring Wildflower Festival, hosted by the East Bay Regional Park District.

The beautiful sunshine, wildflower blooms, nature hikes, and live music drew families from all over the Bay Area to Sunol Regional Wilderness. Over 300 kids stopped at the SFPUC resource booth to create their very own personal paw print necklaces while staff shared information to residents about our Sunol Valley projects underway including the Sunol Yard upgrade, construction of the Fish Passage Facilities Project within Alameda Creek Watershed and the Calaveras Dam Replacement Project.

We hope that you were able to experience this awesome event and enjoy the wildflower season as much as our staff did. See you around Sunol Valley!

Friday, March 31, 2017

Join Us at the 2017 Sunol Wildflower Festival

It is wildflower season in the Sunol Valley! Come enjoy the wonderful blooming flowers at the annual Sunol Wildflower Festival hosted by our friends at the East Bay Regional Park District.

When:  Sunday, April 9, 2017 from 11am to 4pm
Where: Sunol Regional Wilderness, 1895 Geary Road, Sunol, CA
Cost:    Free admission ($5 parking)

The festival is a fun family day out.  Learn about watershed animals, wildflowers, and grasslands. Enjoy the beauties of spring in one of the East Bay Regional Park District’s crown jewels at the Sunol Regional Wilderness.

We at the SFPUC are looking forward to it. Stop by and visit us at our booth. Get the latest and greatest information on all of our ongoing projects. Flaunt your Alameda Creek Watershed knowledge and win a prize! Fun crafts for the kids. 

We hope you see you on April 9th where the wildflowers grow!

For more information about the festival, visit

Friday, March 24, 2017

Spring at San Antonio Reservoir

Happy Photo Friday!

Anybody passing through the Sunol Valley these days can't help but notice that spring has sprung.  The hillsides are vibrant green. Wildflowers are starting to make their colorful appearance. 

And SFPUC Watershed Keeper Pat is out on the watershed, as usual. Today's Photo Friday is courtesy of Pat, who shared this early morning picture from San Antonio Reservoir.

Happy Spring, Everyone!

Friday, March 17, 2017

Photo Friday From the Fish Passage Project on Alameda Creek

Happy Photo Friday, Everyone!

Ever wonder what a fish ladder looks like from the inside?

You are about to find out, courtesy of our Fish Passage Facilities within the Alameda Creek Watershed Project. The project's goal is to support the restoration of steelhead trout to the Southern Alameda Creek Watershed by building a fish ladder around the SFPUC's Alameda Creek Diversion Dam, in addition to other fish-friendly improvements on the structure.  

Construction is expected to be complete in fall 2018.

Workers pouring a concrete slab for the Fish Ladder.

A member of the construction crew examines the rebar to reinforce the fish ladder.

Thursday, March 9, 2017

Celebrating Amazing Women Near You

Just this week, we celebrated International Women’s Day on March 8th. March is also the beginning of National Women's History Month. In honor of the contributions of hard-working women everywhere, we wanted to highlight a few fabulous women who happen to work at the Calaveras Dam Replacement Project whose daily contributions ensure the success of this critical project. 

Eunice Lee, Field Engineer, Sukut Construction

As an alumna of the UC Irvine Civil Engineering program, Eunice has been working on heavy civil construction projects since 2010.  As part of the contractor’s team, Eunice is a field engineer who specifically oversees the installation of geotechnical instrumentation and the permanent power system for the future replacement dam.  Eunice truly enjoys being a part of this team working with so many experts and experienced individuals to build something great. 

Karene Salaam, Project Controls Analyst, Black and Veatch

Staff who make important contributions to the project don’t always work in the field. We have a team of people whose task it is to track project costs and spending. On a job the size of the Calaveras Dam Replacement Project, this is no simple task. Karene Salaam is part of the Construction Management team and oversees the preparation of cost reports, progress charts, manpower plans, equipment and material costs and project schedules.  Her careful review and analysis ensures the San Francisco Public Utilities Commission has close financial oversight of all project spending by the construction contractor and the subcontractors.

Carrie Dovzak, Geologist, Environmental and Naturally Occurring Asbestos Compliance MonitorSan Francisco Public Utilities Commission (SFPUC)

Carrie Dovzak has worked for the SFPUC for 10 years, the last 6 1/2 of it working on Sunol Valley projects. It is Carrie's job to monitor construction activities to ensure compliance with environmental regulations and protections. She studied geology after traveling the world with her family - a perk of her father working for Pan American Airlines. After graduating, she mapped landslides in Northern Italy before returning to the U.S. to join her family. She continued her studies in Engineering Geology and Environmental Education at San Jose State and Hayward State. "Everyone should take a few classes in geology, you see the world in a completely different way!" she insists.

Ritu Gyawali Giri, Senior Engineer, Piping and Pipeline, Sukut Construction

Ritu Gyawali Giri is part of the outlet works team. She and her team focus on the new piping and pipelines that allow the SFPUC to take water out of the reservoir to our customers. She began in the construction industry in 2002, as a Site Engineer in Nepal. She has worked on projects all over the world, from Asia to Africa to the United States. Ritu relishes working through the geographical and environmental challenges to build the new Calaveras Dam. She is delighted to be a woman engineer working at the Calaveras Dam Replacement Project.

Thursday, March 2, 2017

A Day in the Life of a QA Inspector

Meet Minh
Minh Nguyen is one of our QA inspectors working at the Calaveras Dam Replacement Project. On a chilly morning in Sunol Valley, he is typically one of the first team members on-site with a coffee in hand.

What is a QA Inspector? A Quality Assurance (QA) inspector is someone that ensures the project is being built correctly. They are tasked with observing and reporting that quality control measures are effective, so that the entire dam project is being constructed to the expectation of the San Francisco Public Utilities Commission.

“Divide and conquer,” is the motto Minh likes to personally use every morning when the team of QA inspectors report to each of the major activities on site. The QA Inspectors pair themselves with a Quality Control (QC) inspector as they observe activities such as placing materials into the dam, cleaning and preparation of rock, installing rebar, and testing of materials used to build the dam will meet specific quality standards. Communication is of vital importance between the QA and QC because they all need to agree to the same level of quality. When Minh is not performing QA Inspection at Calaveras Dam, you can find him playing a game of flag football, rock climbing, backpacking in the wilderness, or just hanging out with friends on the weekends.

Minh working on inspection of the Stream Maintenance Building

Friday, February 24, 2017

From Acorns to Oaks

What do we see here looking down this plastic tube?

These are acorns collected from the Sunol Valley. For what you ask? We are planting over 150 Oak trees at the Calaveras Dam Replacement Project. As a commitment to the environment, the tree plantings are part of our mitigation to restore oak woodland at our project site. We are also committed to re vegetating all areas with annual grassland where oak woodland is not appropriate. 

Among the species being planted are the Coast Live Oak (Quercus agrifolia) and the Blue Oak (Quercus douglassii). Historically, oak trees are slow growing and can take as long as two to three decades before they begin to provide significant shade. Winter is an ideal time to plant to allow the tree to focus on root growth. 

Some oaks can send a tap root down as deep as five feet in the first year of growth. To help the acorns sprout, and to avoid being dug up by squirrels and birds, they are placed in the plastic tubes right into the ground. The tubes also protect them from hungry herbivores –like deer - and provide a great micro climate for the trees to thrive. 

The next photo shows our oak tree plantings in an area we are no longer working in, the left abutment of the dam, located at the Calaveras Dam Replacement Project. 

See you around the Valley!

Thursday, February 16, 2017

What is this Building and What Does it Have to do with Fish?

Despite the recent heavy rains, the crews at the Calaveras Dam Replacement Project have been pouring concrete for an important feature of the future Dam – the stream maintenance building, pictured below.  The new building stands 25 feet tall and is located downstream at the toe of the future replacement dam.

We at the SFPUC will be releasing water from the future Calaveras Dam to support fish in the Southern Alameda Creek Watershed.  What’s that have to do with this building?  A lot, actually.  The stream maintenance structure provides a place for water discharged out of the future Dam to be collected and then discharged in a controlled manner to the nearby Creeks to support fish habitat. Water will flow from the reservoir to the structure via two 30 inch diameter pipes. Water will exit the structure over grouted rip rap to prevent erosion.

The Calaveras Dam Replacement project is more than 80% complete and expected to be completed in mid-2019.

Thursday, February 9, 2017

Getting By with a Little Help From Our Friends

We do not need to tell you that now is the rainy season in Northern California. Some amphibians in the  Sunol Valley use the the wet season to move around from their burrows to breeding habitat and to find food.

Recently one of the workers at the Calaveras Dam Replacement Project spotted this California newt  passing through the construction site. On its back a Sierran Tree frog was hitching a ride. Who can’t relate to a time when you need a lift to get where you’re going?

Our workers are trained to spot wildlife like this and move them out of harm’s way for construction… hitchhiking or not.

Stay safe and dry out there! 

Friday, February 3, 2017

Photo Friday in the Sunol Valley

Today we thought we’d combine two blog traditions - Photo Friday and Throwback Thursday.

Here’s a photo of how we used to transport water transmission pipe when Calaveras Dam was under construction in 1912.

Here’s a more recent example from a Water System Improvement Program (WSIP) project elsewhere in the Sunol Valley in 2012.

The water system that serves our customers is almost 100 years old in places, and less than 1 year old in others.  We will continue to upgrade crucial portions of the system through the $4.8 billion Water System Improvement Program and beyond through our 10 year Water Capital Improvement Program.

Have a great weekend everyone. See you around the Valley! 

Friday, January 27, 2017

Photo Friday: Bobcats on Calaveras Road

Here is a recent photo taken by our Watershed Keeper Pat in Sunol Valley. It was a reminder about the amazing wildlife out here in the Alameda Creek watershed and to keep a look out for them on the roads.

Just a reminder that due to storm damage, Calaveras Road remains CLOSED to all types of thru traffic 7 days a week, 24 hours a day, between Geary Road and Oakridge Road near the Alameda/Santa Clara County line.

Under normal conditions and the construction schedule, Calaveras Road would be open to thru traffic on weekends and holidays. However, at this time the road will remain closed every day to all traffic until further notice.

The entrance to East Bay Regional Park District's Sunol Regional Wilderness will be open at all times from the north.

Visit for more details and for a map of the closure.

Friday, January 20, 2017

What's on Tap in Sunol Valley?

The New Year has brought much needed rainfall to the Sunol Valley. Despite the winter weather, our teams are continuing the important work to seismically upgrade the facilities that deliver drinking water to 2.6 million Bay Area customers. These projects are part of the $4.8 billion Water System Improvement Program (WSIP). The San Francisco Public Utilities Commission (SFPUC) is the owner and operator of the Hetch Hetchy Regional Water System. In addition, other work, such as work on the Alameda Creek Watershed Center and upgrades to our Sunol Yard, are also underway this year. 

Calaveras Dam Replacement Project

Work is still underway to replace the existing dam with a seismically-robust dam in order to restore its historic storage capacity. Rebuilding this dam and filling the reservoir is crucial to the reliable water supply of our customers. Over seven million cubic yards of earth and rock materials have been excavated. We have started to construct the new dam. Crews have constructed a new tower and shaft with five adits which connect outlet pipelines to the reservoir. The new 1550 ft spillway was completed in April 2016. The dam and all the outlet works have been designed to withstand the force of a 7.25 magnitude maximum credible earthquake from the nearby Calaveras Fault. The project is over 78% complete.

Due to recent storm impacts, portions of Calaveras Road remains closed to the public on 7 days a week. Please visit for more specific details regarding the closure.

Fish Passage Facilities within the Alameda Creek Watershed

Construction for the Fish Passage Facilities within the Alameda Creek Watershed began earlier in 2016. The Calaveras Reservoir collects water from Alameda Creek by means of the Alameda Creek Diversion Dam (ACDD), a 1.8-mile-long Alameda Creek Diversion Tunnel from other streams that flow directly into the Reservoir.

The project will improve the current facility and develop fish passage facilities within the Alameda Creek Watershed. This important work will support restoration of steelhead trout to the Watershed. The project will construct a fish ladder to facilitate fish passage around the existing Alameda Creek Diversion Dam. The project is approximately 30% complete and project completion is expected in Fall 2018.

Alameda Creek Recapture Project

The proposed project would recapture a certain volume of water that would be released and bypassed at Calaveras Dam and Alameda Creek Diversion Dam. The recaptured water would be pumped from an existing quarry pit (Pit F2) in the Sunol Valley, downstream of the compliance points for the bypasses and releases below the ACDD and Calaveras Dam, respectively.

The project would utilize the natural infiltration of water into the ground in the vicinity of Pit F2, and the recaptured water would be transferred to the SFPUC water system via either the San Antonio Reservoir or the Sunol Valley Water Treatment Plant. The recapture operation would be conducted within the SFPUC’s existing pre-1914 appropriative water rights. 

The Draft Environmental Impact Report was released in November 2016. Construction is expected to begin in Fall 2017 and last for approximately 18 months.

Sunol Yard & Alameda Creek Watershed Center

Construction of upgrades to our Sunol Corporation Yard (located on SFPUC lands near the Sunol Water Temple) are expected to begin in February 2017 and last approximately 22 months.  

Please note that the Sunol Water Temple will be closed during construction to protect the safety of members of the public passing through the area. The Sunol AgPark will remain open to farmers during construction.

Alameda Creek Watershed Center in Sunol and work on the Education Master Plan for the Center continues in 2017. The Center design continues to undergo value engineering, and results are expected in early 2017.  Construction of the Native Plant Nursery for the plants that will be in the new Sunol Yard and Watershed Discovery Trail at the Center will also begin in 2017.