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Trenchless technology allows the Vallecitor Water District to effect repairs without digging up streets. Photo: Vallecitos Water District

Trenchless Technology Saves Ratepayers Time, Money, and Inconvenience

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A method of replacing sewer pipe without digging or removing the old pipe – trenchless pipe repair – is saving Vallecitos Water District ratepayers money and reducing traffic delays. It’s another example of how water agencies in San Diego County are tapping cost-effective technology.

The district is using the trenchless method to extend the life of its service pipelines while avoiding the disruption of excavation trenches and traffic rerouting around work areas on public streets. Instead of digging the pipeline up to replace it, the sewer line is rehabilitated from inside the pipe. This trenchless technology method increases the efficiency and the service life of the pipe without having to replace it; eliminating paving, reducing traffic interruptions, as well as saving the District and in turn its ratepayers money.

“Traditional installation methods cause such a disruption to customers daily routine, so we’re really lucky when this type of project presents itself to the District,” said Jason Hubbard, a senior engineer with the district. “Our residents are going to have a much better day without navigating a large construction zone – they can also be quite noisy and dusty. Bottom line, everyone’s happy.”

Avoiding disruption to customers from trenches and traffic rerouting

By avoiding the need for exacation, streets can be kept open and functioning while work progresses. Photo: Vallecitos Water DIstrict

By avoiding the need for exacation, streets can be kept open and functioning while work progresses. Photo: Vallecitos Water District

Pipeline integrity can be lost due to a combination of many factors such as missing pieces, cracks, pinholes, offsets at joints, and root intrusion. Numerous methods, technologies and practices are used by water agencies to ensure pipeline integrity.

The Vallecitos Water District works to find innovative technologies to ensure continuing water, wastewater, and reclamation services to a population of 103,000 residents within its 45-square-mile service area. There are 358 miles of water pipelines and 276 miles of sewer pipelines in the VWD’s 45-square-mile service area, serving more than 103,000 residents. The pipelines are designed, built, and operated to be safe, reliable, and sustainable to achieve pipe integrity. This means ensuring a pipeline and all its related components are running properly, no small task.

“We constantly work to maintain a reliable sewer conveyance system by utilizing a plethora of innovative and cost-effective technologies,” said Hubbard.

Trenchless technology also results in cost savings

Trrenchless technology is also cost effect in addition to being less disruption to customers. Photo: Vallecitos Water District

Trrenchless technology is also cost effect in addition to being less disruption to customers. Photo: Vallecitos Water District

VWD employed two types of trenchless rehabilitation methods, cured-in-place-pipe (CIPP) liners and spiral wound liners to maintain District pipes. CIPP liners are epoxy saturated felt tubes, which are inserted into the existing pipe, then cured and hardened by steam. There are no joints or seams. Spiral Wound Liners use an above groundwinding machine to feed interlocking PVC profile into an old pipe.

Both methods result in a new “pipe within a pipe.” Little to no digging is involved in this trenchless process, making for a less disruptive and more cost-effective method than traditional “dig and replace” pipe repair methods. The liner can be inserted using water or air pressure. Liner technology is particularly effective in hard to reach areas, such as easements. For projects along residential and business streets, the trenchless method reduces disruptions and impacts to businesses and neighborhoods.

This technology helped the Vallecitos Water District to rehabilitate 1,595 feet of sewer pipe. The district plans to rehabilitate another 2,300 feet in 2020. Sections of critical infrastructure were rehabilitated at an affordable price due to the CIPP and spiral wound liner options. No sewer laterals were cut, and work was done without a sewer bypass. The project was completed with a savings to the District of $37,000 under the estimated budget. The lining part of the operation took less than three hours.

READ MORE: Innovative Relining Program Reduces Cost, Extends Pipeline Service

 

Salton Sea Restoration Program is moving forward with a restoration project to benefit migratory birds.

Major Habitat Restoration Project Set to Move Forward at Salton Sea

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The State of California, after resolving key hurdles, is set to move forward on a restoration project at the Salton Sea to improve habitat for migratory birds, while covering more exposed sea bed.

When the State Water Resources Control Board last met to discuss the status of the Salton Sea Management Program (SSMP), Chairman E. Joaquin Esquivel called upon the State to resolve issues causing delays in the State’s lead project at the sea—Species Conservation Habitat.

Resolution was reached on several of the issues in May, and now the state can move forward with a design-build plan for constructing the habitat project. Development of the project is a tangible sign of the Salton Sea Management Plan being implemented.

Wetlands project completed

Smaller-scale restoration projects at the Salton Sea are moving forward. California agencies, the Salton Sea Authority, and the Torres Martinez Desert Cahuilla Tribe completed a 60-acre wetlands project on the northern end of the sea. Additionally, work is advancing on the 500-plus acre Red Hill Marina wetlands project on the southeast side of the sea. Earthwork is complete, pipelines are in place, and pumps have been ordered and are on their way.

But, the Species Conservation Habitat project is the shining piece of phase one of California’s 10-year approach to the Salton Sea Management Program. It is a proof of concept project that would lay the groundwork for projects to come. The habitat project spans nearly 4,000 acres and entails building a series of ponds that would provide a controlled habitat to manage a fish population, which, in return, would provide a food source for migratory birds. Most importantly, it is a habitat project that would cover an expansive area of exposed playa.

Land issues resolved

What makes the Species Conservation Habitat project so critical is that it has already gone through the permitting phase for the entire 4,000 acres and is ready to move forward with construction. Those who follow the Salton Sea issues anticipated SCH would already be moving forward by now in a phased approach that would have seen about 640 acres completed first. However, an easement issue, lack of staff dedicated to the SSMP, and a learning curve associated with a design-build project delivery process – led to delays in the project.

With land issues resolved, the fact that California is increasing its staff dedicated to the Salton Sea and the Salton Sea Management Plan, and state agencies becoming more familiar with the design-build project delivery method, several obstacles impeding progress have been removed. The 4,000-acre project is expected to start this year be completed in 2023.

The State Water Resources Control Board will likely be holding a new workshop on the Salton Sea in the near future. By then, the State is to have a recovery plan as a path forward to prevent future delays in project development.

Mammoth Mountain received record snowfall in May 2019. Photo: Mammoth Mountain, Inc. California Reservoirs

California Reservoirs Near Capacity in May

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It has been a winter – and spring – for the record books, for California reservoirs and ski resorts. And, it’s not over yet.

Snow has continued to fall throughout May, with several inches or more in the Sierra Nevada and the southern California mountains.

In the lowlands, the City of San Diego has experienced one of its wettest months of May on record. The San Diego National Weather Service reported that Alpine and El Cajon set daily precipitation records on May 23.

The normal rainfall at Lindbergh Field during the water year (October 1 – September 30) averages about 10.3 inches. In the current water year, 12.7 inches of rain has been recorded at Lindbergh Field as of May 23.

May snowfall in the Sierra Nevada

“It’s atypical to see the snowpack increase in May,” said Alexi Schnell, water resources specialist with the San Diego County Water Authority. “The impact of atmospheric river storms helped push snowpack levels in the northern Sierra to 172 percent of normal as of May 23.”

Statewide Summary of Sierra Nevada Snow Water Content

A bountiful year for snow continued into May in the Sierra Nevada. Graphic: California DWR

Record snowfall also allowed many ski areas, from Squaw Alpine to Mammoth Mountain, to extend their ski seasons into late-Spring, with fresh powder in May a bonus for skiers.

A May to remember at Mammoth Mountain

Mammoth Mountain tweeted that it has received 29 inches of snow as of May 23, “officially our snowiest May on record, beating out May 2015.” (Video courtesy of Mammoth Mountain).

Major reservoirs near capacity

Many of the state’s major reservoirs are near capacity and are significantly above their historical averages as of May 23. Lake Shasta is at 97 percent of capacity and at 113 percent of its historical average.

Most major California reservoirs are near capacity and significantly above historical averages for May 23.

Most major California reservoirs are near capacity and significantly above historical averages for May 23. Graphic: California DWR

Summer is coming

Schnell cautions that this current water year is an exception, and the climatological cycle in California can bring several consecutive years of drought, like the 2015-2017 period, which prompted mandatory water-use reductions.

While the winter and spring has been ‘atypical,’ the summer could set some records too.

“Looking ahead over the next three months, the National Weather Service forecast shows that there is a greater than 50 percent chance the region will be warmer than normal,” Schnell said.

NWS Climate Prediction Center 3-month temperature outlook

NWS Climate Prediction Center three-month temperature outlook. Graphic: NWS/NOAA

San Diego County Water Authority Logo Stacked Tagline

Water Authority Recommends $1.7 Billion Two-Year Budget

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San Diego – The San Diego County Water Authority’s Acting General Manager today recommended to the Board of Directors a $1.7 billion budget for fiscal years 2020 and 2021, up 5 percent from the current two-year budget, due largely to increasing costs for water supply, supply reliability and infrastructure improvements.

Water Authority staff also proposed increasing rates and charges for member agencies by 4.3 percent for treated water and 4.8 percent for untreated water in calendar year 2020, attributable to rate increases by the Metropolitan Water District of Southern California, continued investments in supply reliability, and reduced water sales that lower demand and mean fixed costs must be spread over fewer gallons.

 

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Landmark Agreement on Santa Margarita River Project Signed By Federal Judge

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Fallbrook, Calif. – A lawsuit filed in 1951 has finally been settled as of April 29, 2019. After 68 long years of litigation, planning and brainstorming, the Fallbrook Public Utility District and Marine Corps Base Camp Pendleton jointly hailed the end of the lawsuit at a district board meeting May 20.

The Santa Margarita River Conjunctive Use Project was signed by U.S. District Court Judge Gonzalo Curiel in April. This is a landmark agreement that finally, officially, settles how the two will share their water rights to the river.

 

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OMWD Honored with Distinguished Budget Award for Eighteenth Consecutive Year

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Encinitas, Calif. — At its May 22 meeting, Olivenhain Municipal Water District’s Board of Directors accepted for its 2018-2019 fiscal year budget the Government Finance Officers Association’s Distinguished Budget Presentation Award. This marks the eighteenth consecutive year OMWD has achieved this award.

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Olivenhain Municipal Water District Recycled Water Pipelines Named ‘Project of the Year’

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Encinitas, Calif.—American Public Works Association’s San Diego and Imperial Counties Chapter has recognized Olivenhain Municipal Water District’s Avenida La Posta Recycled Water Project as “Project of the Year.” The award, celebrating OMWD’s engineering and project management efforts, was presented yesterday at a reception at Paradise Point Resort in San Diego.

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The Ultimate Water Panel: The Biggest Water Issues Facing San Diego and the South Bay

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(Chula Vista, Calif.) – Join the Otay Water District and Sweetwater Authority Board Chairs to learn more about water issues facing San Diego County and more specifically South Bay. The next Albondigas will be held on Friday, May 17 at Mangia Italiano in Chula Vista from 11:45 p.m. to 1 p.m. Topics to be covered at the event include Governor Gavin Newsom’s N-10-19 Executive Order on water supply planning, water recycling for 2019 and beyond, water legislation, and more.

 

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Pumped Hydro 2 - SanV-WaterAuthority-May 2019

Water Authority Supports Bill to Spur Pumped Storage Projects

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A bill that the San Diego County Water Authority’s Board of Directors voted to support in March is scheduled for a hearing Thursday in the state Senate Appropriations Committee. The proposed state legislation promotes the development of pumped hydroelectric storage projects to help meet state energy and climate goals.

Senate Bill 772 by Sen. Steven Bradford of Gardena promotes the development of pumped hydroelectric storage projects to help meet state energy and climate goals.

The Board’s support for the legislation followed the March release of a research paper from a team led by UC San Diego Professor David G. Victor that emphasizes the benefits of expanding pumped hydro energy storage as a cost-effective way to help California meet its renewable energy goals and reduce greenhouse gas emissions.

Read the Pumped Energy Storage report here.

The Water Authority and the City of San Diego are exploring a potential pumped storage energy project at the San Vicente Reservoir that could store 4,000 megawatt-hours per day of energy, or 500 megawatts of capacity for eight hours.

Energy generated by renewable sources, like wind and solar, can be captured by energy storage facilities and then distributed then needed. Batteries and pumped energy storage will provide the needed energy storage for both short-term needs (batteries, less than 4 hours) and long-duration needs (pumped energy storage, 8 hours or more).

Large-scale, long-duration renewable energy source

A key to the San Vicente concept and others is development of statewide institutional and regulatory support for large-scale, long duration energy storage lasting up to eight hours. Pumped storage projects store solar and wind power during low-demand periods for use during high-demand periods, such as evenings when people are cooking, washing clothes and running air conditioners.

The State Energy Resources Conservation and Development Commission has identified bulk energy storage – including pumped hydroelectric storage – as a core strategy for integrating renewable energy resources into the California electrical grid and reducing greenhouse gases.

In addition, the white paper stresses the need for new state policies that will ensure that pumped energy storage projects enter commercial operations when they will be critically needed.

“To be consistent with California’s energy vision, active new policy support is needed to facilitate the development of pumped energy storage,” according to Victor’s paper. “Those policies should recognize the long lead times in building pumped energy storage projects (5 to 10 years). New policy efforts must begin now.

“Among the needed actions are state-backed support for some early projects that would jump start investment in this proven technology. This support can demonstrate viable business models and investment strategies that will pave the way for more private sector-led projects in the future.”

Providing ratepayer benefits

Pumped energy storage projects work like giant batteries by storing excess renewable energy during the day, when renewable power production peaks. Energy is released from the “battery” in the evening, when energy use increases, and renewable energy is not available.

Keeping the electrical grid reliable requires not only short-term energy storage, but long-duration, large-scale storage.

“Many expert studies have been performed that demonstrate the value of pumped energy storage, including CAISO’s Bulk Energy Storage Case Study, which found that a 500 megawatts (MW) pumped energy storage project in Southern California would provide ratepayers with a savings of up to $51M per year from improved efficiencies in system operation,” according to Victor’s white paper.

“Without significant new large-scale energy storage, California will likely be required to import more energy from other states, including potentially power generated with higher carbon emissions, such as coal,” the paper said. “The State will be unable to meet its renewable and climate goals reliably without large-scale energy storage.”

SB 772 is an attempt to address some of the issues identified by Victor and others. The legislation would require the California Independent System Operator, which runs the state’s power grid, to create a competitive bidding process by June 2022 to acquire a substantial quantity of long-duration energy storage – the type created by pumped hydroelectric storage.

Vallecitos Water District Wastewater Collection Systems workers Raul Rodarte (left) and David Saavedra conduct smoke testing. Photo: Vallecitos Water District

Vallecitos Water District Smokes Out Wastewater System Problems

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Problems in wastewater systems can’t hide behind a smokescreen at the Vallecitos Water District. The district’s Systems Collection Department routinely performs “smoke testing” of its wastewater system. This technique can easily locate flows caused by broken or incorrectly installed sewer pipes, lateral connections, or missing/broken clean-out caps.

The test is performed by introducing smoke, comprised primarily of steam, through a device similar to a fog generating machine, into the wastewater systems. Staff can see if smoke comes out of the system through any leaks or breaches.

“We don’t want clean rainwater entering the sanitary sewer system, because we don’t want to treat clean water down at the treatment plant,” said Matthew Thompson, VWD wastewater collection worker. “We also don’t want to have an open system in case of an emergency, where liquids could exit the system.”

Residents are notified prior to any smoke testing in their neighborhood. The use of the smoke is an approved practice by the U.S. EPA and has no adverse health effects. The smoke used by VWD is non-toxic and dissipates quickly. During the testing process, residents can assist by monitoring the plumbing systems inside their homes to see if they have any internal problems.

Watch how the smoke testing process works in this video.

Crews inject smoke into the sewer system. It bypasses the living quarters of each residence before rising out of vents located on the roof. This is what crews are looking for, because it’s a good indicator there are no illegal hookups to the sewer. Smoke may also escape if the private sewer lateral clean-out is missing its cap.

If smoke emits from the home’s storm drain system or front yard, it could mean there is a possible illegal system connection, or an opening to the sewer that can lead to surplus water levels and subsequent sewer spills.

Field crews take care of any problems that may arise during testing. Residents are notified to disconnect illegal connections or face potential future fines. While the district does not maintain the plumbing inside homes, including the sewer lateral or the clean out, district crews will make simple, inexpensive repairs on the spot as a service to their customers. A doorhanger is left after any quick-fix is completed.

Vallecitos Water District Wastewater Collection Systems workers Dennis Richardson (standing) and David Saavedra inject smoke into the sewer system. Photo: Vallecitos Water District Smoke testing

Vallecitos Water District Wastewater Collection Systems workers Dennis Richardson (standing) and David Saavedra inject smoke into the sewer system. Photo: Vallecitos Water District

“Our ultimate goal is to make the customer happy, and that there is no interrupted service,” said Thompson. “If you see any of the wastewater crew out in the street, feel free to come talk to us and ask us what we’re doing. We’d love to share how we’re helping the system flow.”

In some cases, customers identify sewer problems themselves. District Systems Collection Department staff then determine the source of any potential problems, and how to resolve those problems.

Smoke testing isn’t new, but it might catch residents off guard. It has been used since the 1950s. For more than 10 years, smoke testing has proved to be a valuable ally in sewer maintenance. The Vallecitos Water District performs a minimum of four tests annually to keep its system operating at the optimum level.