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Construction near San Marcos homes required creative thinking and community cooperation from the Vallecitos Water District to successfully complete the project. infrastructure

Community Outreach Makes Challenging Infrastructure Update a ‘Walk in the Park’

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In its efforts to maintain its critical infrastructure, the Vallecitos Water District undertook a challenging update to a wastewater system pipeline constrained by its precarious location.

The existing eight-inch gravity sewer pipeline conveys wastewater from the intersection of Rock Springs Road and Bennett Avenue west through a greenbelt area to an existing 12-inch pipeline in Rock Springs Road at Lancer Park Avenue. To expand capacity for current and future growth, it was replaced with a new 15-inch PVC pipe west of Matthew Lane and a 12-inch PVC pipe north and east of Matthew Lane.

See video following the progress of this vital infrastructure project

 

Complications due to environmental and neighborhood protection

The location of the affected manhole put equipment and crews close to a SDG&E gas line inside a greenbelt park area. Photo: Vallecitos WD infrastructure

The location of the affected manhole put equipment and crews close to a SDG&E gas line inside a greenbelt park area. Photo: Vallecitos Water District

The District always prefers to perform work in a street or public right-of-way. Neither were possible for this project due to its greenbelt and park location within feet of residential homes.

“We took every environmental precaution prior to construction,” said Lito Santos, Vallecitos Water District Project Engineer. “We performed a nesting survey, a raptor survey, and we also worked to tunnel under the bridge,” within the Environmental Protection Agency’s “Clear Water Rule.”

San Marcos Woods Homeowners Association board member Ross Fisher acted as a liaison between homeowners and the HOA with the District. Fisher expressed concern about access to the work area by the District’s large combination truck. The original proposal to create a concrete strip to drive over wasn’t feasible.

Due to its incredible strength, the grass-crete and existing lawns can handle the weight of a large service vehicle driving on it without significant damage. Photo: Vallecitos WD

Due to its incredible strength, the grass-crete and existing lawns can handle the weight of a large service vehicle driving on it without significant damage. Photo: Vallecitos Water District

Working together with Vallecitos Water District engineers, the group chose an alternative material called “grass-crete.” Grass-crete is a green porous paving solution that comes in easy-to-install rolls. It’s flexible, lightweight, durable and provides design versatility to the project. Due to its incredible strength, the grass-crete and existing lawns can handle the weight of a large service vehicle driving on it without significant damage.

Proximity to additional threats

Manholes were waterproofed, coated, and sealed as an additional precaution and to extend their longevity.

Manholes were waterproofed, coated, and sealed as an additional precaution and to extend their longevity. Photo: Vallecitos Water District

Vallecitos Water District engineers also worked with San Diego Gas & Electric to perform its work with enough safety clearance from a 16-inch transmission main artery gas line pressurized at 800 pounds per square inch. The District secured permission to dig within two to three feet from the line instead of the standard five feet.

The work area is also prone to flooding after large rain events, raising the water levels in the nearby creek high enough to infiltrate and inflow into the manholes. The District moved the manholes clear of the creek embankment, and lifted the manholes two feet above ground and clear of the flood plain to prevent runoff intrusion. Manholes were waterproofed, coated, and sealed as an additional precaution and to extend their longevity.

Homeowners praise Vallecitos cooperation with community

The District moved the manholes clear of the creek embankment, and lifted the manholes two feet above ground and clear of the flood plain to prevent runoff intrusion.

The District moved the manholes clear of the creek embankment, and lifted the manholes two feet above ground and clear of the flood plain to prevent runoff intrusion. Photo: Vallecitos Water District

“Overall Vallecitos left the greenbelt area as good or better when they started,” said Fisher of the HOA. “On a scale of one to ten, I have to give them a 9.5 or a ten. Working with the inspectors and Lito Santos the engineer, everything we asked for was done in a timely manner.”

“The project was a huge success,” said Santos. “Working with the Vallecitos Engineering Team, the Inspection Team and Mr. Fischer, it was not just a Vallecitos highlight but a career highlight.”

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Water Districts Work Together to Save Ratepayers Money

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Encinitas, Calif. — Olivenhain Municipal Water District and Vallecitos Water District have entered into an agreement that will allow for cooperative use of Vallecitos’ Double Peak Reservoir site in San Marcos. The arrangement is expected to save OMWD ratepayers over $100,000.

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Strategic Steps Minimize Water Rates for 2021

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Following a public hearing, the San Diego County Water Authority’s Board of Directors today adopted rate increases for 2021 that are 30% lower than proposed last month following a series of refinements by staff. In addition, the Board directed staff to return in September or October with any further opportunities to reduce the 2021 rate increases, such as a decrease in rates set by the Metropolitan Water District of Southern California or the acquisition of federal or state economic stimulus funds.

As adopted June 25, the all-in rates charged to the Water Authority’s 24 member agencies will increase by 4.8% for untreated water and 4.9% for treated water in calendar year 2021. The new rates take effect January 1, 2021.

Rate increases are driven by reduced water sales, higher rates and charges from MWD and continued regional investments in supply reliability.

Secure water supply is foundation of economic recovery

Since the staff’s rate proposal was released in May, the Water Authority re-evaluated several assumptions driven by COVID-19 recessionary pressures based on new economic data and forecasts. The Water Authority also funded some costs related to the Carlsbad Desalination Plant this year instead of in 2021. The 2021 rates and charges may be further reduced if MWD makes material changes when revisiting its budget and rates this fall.

“We’ve taken a series of strategic steps to minimize rate impacts during this pandemic-induced recession, despite numerous factors putting upward pressure on rates,” said Water Authority Board Chair Jim Madaffer. “At the same time, the Water Authority is maintaining its long-term fiscal stability while ensuring a safe and reliable regional water supply for residents and businesses that will be the foundation of our economic recovery.”

In 2021, the Water Authority will charge its 24 member agencies an all-in municipal and industrial rate of $1,474 per acre-foot for untreated water, or $68 more per acre-foot than they currently pay. Charges would be $1,769 per acre-foot for treated water, or $83 more per acre-foot than in 2020.

Actual figures will vary by member agency, and each member agency will incorporate costs from the Water Authority into the retail rates it charges to residents, businesses and institutions. (Note: An acre-foot is about 325,900 gallons, enough to serve the annual needs of 2.5 typical four-person households in San Diego County.)

In addition, the rates package includes new Permanent Special Agriculture Water Rates, following the Board’s decision late last year to make the temporary program permanent. The program provides farmers with lower rates that correspond to a lower level of water supply reliability. In 2021, the untreated PSAWR will increase from its current level of $755 per acre-foot to $777 per acre-foot and the treated PSAWR will increase from $1,035 per acre-foot to $1,072 per acre-foot.

Rising costs from MWD affect rates

The fiscal pressures faced by the Water Authority include:

  • Reduced water sales, which are 14% below the current budget and expected to remain low in 2021 due to coronavirus-related business closures and other factors. Decreased water sales put upward pressure on rates because costs must be spread across fewer units sold.
  • Rising costs from MWD that reflect continued increases to its base supply rates and charges and the amount MWD charges to transport the Water Authority’s independent Colorado River supplies. For the Water Authority, MWD’s adopted 2021 rates increase supply costs by more than 9%, or $15.4 million.

The Water Authority’s 2021 rates were developed in conjunction with an independent cost-of-service study to ensure rates and charges comply with state law, legal requirements, cost-of-service standards and Board policies, and strategic tools such as the Long-Range Financing Plan.

In addition, the 2021 rates are designed to ensure Board-adopted debt coverage ratios that support the Water Authority’s strong credit ratings and minimize the cost of borrowing money for construction projects. The Water Authority has credit ratings of AAA with a stable outlook from S&P, AA+ from Fitch, and Aa2 with a stable outlook from Moody’s.

The rates adopted by the Board are the result of strategic measures that include:

  • Providing more than $80 million in rate relief from the Rate Stabilization Fund over the next 24 months.
  • Capitalizing on historically low interest rates and strong credit ratings by lowering annual debt expenditures by optimizing cash to restructure outstanding debt to provide significant savings.
  • Planning to withdraw stored water to reduce water purchases while maintaining water reserves for future years – the result of careful planning and investments over more than two decades.
  • Reducing budget expenditures with a hiring freeze reduced professional services contracts and reprioritizing more than $30 million in capital projects.
Sweetwater Authority Logo 2019Sweetwater Authority Logo 2019

Sweetwater Authority Board Approves $64M Budget for Fiscal Year 2020-21, No Rate Increase

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The Sweetwater Authority Governing Board approved the budget for fiscal year 2020-21 at its June 24, 2020 meeting. The budget does not increase water rates for customers and reflects more than $13M in reductions over last fiscal year. To achieve these savings, the Board worked closely with Authority staff to produce a balanced budget that minimizes the financial impact to customers.

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The Fallbrook PUD Board tour group initially drove from the FPUD administration building to the Alturas Road plant and then traveled along the pipeline alignment before arriving at the Gheen Pump Station. Photo: Fallbrook Public Utilities District

Fallbrook PUD Board Members Tour Construction Project

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As a result of the coronavirus pandemic, public agencies have found creative solutions to holding meetings in compliance with the State of California’s meeting laws. Recently, Fallbrook Public Utility District board members stepped away from their video screens, using the opportunity to take a field trip to view a new project while conducting a traveling board meeting.

The Santa Margarita River Conjunctive Use Project is a joint project with Marine Corps Base Camp Pendleton, and will eventually supply about 30% of the District’s water, and virtually all of Camp Pendleton’s water.

Fallbrook PUD board members view construction project

Construction of the first section of pipeline on Merida Drive is part of the Santa Margarita River Conjunctive Use Project. This segment of pipeline between Alturas and Mission roads is about 4,500 linear feet and is 35% installed. Photo: Fallbrook Public Utilities District Fallbrook PUD Board

Construction of the first section of pipeline on Merida Drive is part of the Santa Margarita River Conjunctive Use Project. This segment of pipeline between Alturas and Mission roads is about 4,500 linear feet and is 35% installed. Photo: Fallbrook Public Utility District

At the time of the tour, the project had been under construction for 250 days. Due to COVID-19 and social distancing restrictions, board members and others who attended the traveling meeting stayed in their cars. While behind the wheel, board members wove through parts of Fallbrook to follow the path of the new pipeline. With their smartphones turned on and hands-free, representatives followed each other in a single file parade while listening to a live conference call with the project contractor.  Board members learned about construction progress, and saw where and how the pipe will be installed.

The tour and the project began at the treatment plant on Alturas Road, where bulldozers and heavy machinery are moving earth to build the pipeline and a water treatment plant. The pipeline will transport water from the plant through parts of central Fallbrook, ending at McDonald Road. The project also includes a new four million-gallon storage tank, where the tour ended. Participants discussed the possibility of a subsequent tour to view ongoing progress with construction of the facilities.

The entire construction process will take approximately two years to complete, with the pipeline becoming fully operational by 2022.

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Olivenhain Municipal Water District and County of San Diego Department of Parks and Recreation Partnership Receives State Recognition

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County Named Recycled Water Customer of the Year 

Encinitas, Calif. — The WateReuse Association of California recognized County of San Diego Department of Parks and Recreation as a 2020 Recycled Water Customer of the Year today. The award was presented at WateReuse’s first virtual conference. Olivenhain Municipal Water District nominated the County for its dedication to using sustainable recycled water to irrigate County parks in OMWD’s service area.

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The Sweetwater Authority will use innovative technology to flush all 400 miles of its system pipelines. Pnoto: Sweetwater Authority

Sweetwater Authority Taps Innovative Technology to Ensure Water Quality

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The Sweetwater Authority recently began a multiyear water main flushing program using innovative technology to clean all 400 miles of pipeline in its system. It’s part of Sweetwater Authority’s use of the latest technology to deliver a safe, reliable water supply to its South San Diego County customers.

Water main flushing cleans pipeline interiors by sending a rapid flow of water through them. Sweetwater’s program is the first in the region to use a new, innovative technology resulting in less environmental impact.

“We’re committed to providing our customers with high-quality water, ensuring that every drop meets safety standards and protects public health,” said Tish Berge, Sweetwater Authority general manager. “We’re also dedicated to providing the safe, reliable water through the use of best available technology and sustainable practices.”

See the system in action in the following video. A Spanish language version is also available.

New method avoids storm drain discharge

Traditional flushing methods release water from fire hydrants at a high speed in order to flush out naturally occurring sediments accumulating in water pipes over time. Although the sediment itself is harmless, it can eventually affect water color and taste. The water used to clean the pipes often cannot be captured and ends up in the storm drain system.

The bulk of Sweetwater Authority‘s flushing program now eliminates the need to discharge water from fire hydrants during the cleaning process while delivering the same results.

With the closed-loop system and increased controls, crews are able to effectively and thoroughly flush large sections of pipeline with a single setup and staging area. This more efficient setup is less labor-intensive and allows the crew to maintain a safe hub for operations. Photo: Sweetwater Authority

With the closed-loop system and increased controls, crews are able to effectively and thoroughly flush large sections of pipeline with a single setup and staging area. This more efficient setup is less labor-intensive and allows the crew to maintain a safe hub for operations. Photo: Sweetwater Authority

Crews identify all pipes, valves, and fire hydrants located in the area to be flushed. Next, crews connect one end of a hose to a hydrant and the other end of the hose to the no discharge, or NO-DES flushing unit. The process repeats, connecting a second hose to another hydrant and the other end back into the flushing unit, creating a temporary closed loop.

Once the NO-DES flushing unit is turned on and the hydrants are open, water will push through the loop at high pressure, disrupting any accumulated sediment on the inside of the pipes. The water is pushed through a series of sock-like filters, which remove those sediments and return clean, high-quality water back into the system.

Crews closely monitor the filtration system and water quality to determine when flushing of each pipeline segment is complete.

Innovative technology, efficient and environmentally responsible

Additional member water agencies have indicated an interest in the cost-effectiveness of purchasing the NO-DES flushing units for the region and collaborating to create a shared-use program with the technology. Photo: Sweetwater Authority

Additional member water agencies have indicated an interest in the cost-effectiveness of purchasing the NO-DES flushing units for the region and collaborating to create a shared-use program with the technology. Photo: Sweetwater Authority

With the closed-loop system and increased controls, crews are able to effectively and thoroughly flush large sections of pipeline with a single setup and staging area. This more efficient setup is less labor-intensive and allows the crew to maintain a safe hub for operations.

In the National City area 75.8 miles of pipeline was recently flushed. Crews are now completing work in the Bonita area, and then will start work in Chula Vista.

Additional water agencies have indicated an interest in the cost-effectiveness of purchasing the NO-DES flushing units for the region and collaborating to create a shared-use program with the innovative technology.

“Securing a local water supply to ensure the water delivered is of the highest quality through the best technology in our projects and programs helps to maximize value for our customers while also being sustainable,” said Berge.

For more information on the program, go to www.sweetwater.org/flushing.

This temporary bridge allowed Vallecitos Water District crews to repair a manhole without affected sensitive habitat. Photo: Vallecitos Water District rehab manhole

Vallecitos Water District Crews Rehab Manhole, Protecting Environment  

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Vallecitos Water District crews sprang into action to repair and rehabilitate a manhole in danger of failing, successfully preventing a spill, which could have resulted in significant environmental damage.

Located just off Palomar Airport Road in a shared 30-foot easement with the Buena Sanitation District in Carlsbad, the manhole is part of a 30-inch outfall providing a main sewage drain for the City of San Marcos. The line feeds directly into the Encina Wastewater Treatment plant a half-mile from the project site.

Originally constructed in the 1980s, turbulence generated by a hard right-turn along the sewer easement creates hydrogen sulfide gases. These gases corrode concrete and weakened the manhole over the years. Flooding also occurs in the area and allows rainfall to infiltrate the manhole.

Preventing harm to sensitive habitat areas

Vallecitos Water District staff became concerned the structure could fail. The result would be a major sewage spill affecting the nearby Encinas Creek Habitat Conservation Area, ultimately spilling into the Pacific Ocean a mile downstream. The Habitat Conservation Area is owned by the Center for Natural Lands Management, which supports its management through an endowment.

The Encinas Creek HCA is also part of the City of Carlsbad’s habitat management preserve. It includes riparian habitat and is known to be home to state and federally protected species. The Center for Natural Lands Management works to protect the property from trespassing, nonnative invasive plant and animal species, and other issues.

The District determined emergency repairs were required. Although the Vallecitos Water District has proper easement rights to access, operate, and maintain the pipeline, the agency must avoid any impact to the existing habitat while repairing the manhole. This required some creativity by the work crews.

Creative thinking provides access for repairs

A look at the newly repaired manhole. Photo: Vallecitos Water District

A look at the newly repaired manhole. Photo: Vallecitos Water District

The District kept all construction activities within its existing easement to avoid any impacts to existing riparian vegetation. Crews constructed a temporary bridge over an existing stream obstructing access to the manhole. The bridge installation was designed to be temporary, and not affect the existing stream with footings or other supports. Constructing the bridge for access turned out to be the most complex part of the repair project.

District crews working with a contractor team took advantage of the lower sewage flow during the early morning hours, starting work at 3 a.m. to get as low into the waterline as possible. Repairs like this take advantage of the low flows to keep critically important sewer systems in operation.

Instead of replacing the manhole, the District used a polymer concrete replacement product to build a new manhole within the old manhole. As a result, no excavation was needed. Unlike regular concrete, the new material is corrosion-proof and should provide District customers in San Marcos with many years of reliable service while protecting the environment.

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Fitch Reaffirms OMWD’s “AAA” Bond Rating

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Encinitas, Calif. — At Olivenhain Municipal Water District’s June 17 board meeting, OMWD staff notified its Board of Directors that Fitch Ratings, a global rating agency that offers independent credit opinions, has reaffirmed the district’s “AAA” bond rating with a stable outlook. AAA is the highest possible rating assigned by Fitch, and OMWD is one of only a handful of Southern California water agencies that have achieved this rating.

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Regional Conveyance Study-Colorado River Aqueduct-RCS-primary-June 2020

Draft Study Highlights Region’s Water Conveyance Options

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A draft report released today by the San Diego County Water Authority shows that building a new conveyance system to transport regional water supplies from the Colorado River Quantification Settlement Agreement is cost-competitive with other long-term options for meeting the region’s water needs.

The draft Phase A report is under review by water officials across the region. The Water Authority’s Board of Directors is expected to decide whether to move to Phase B at its July 23 meeting.

“By releasing this draft report – along with an independent review of key financial assumptions – we are trying to spark a thoughtful dialogue about our region’s water future,” said Dan Denham, deputy general manager for the Water Authority. “Given the long lead time for major water infrastructure projects, it’s important that San Diego County wrestle with these complex questions today so we can control our own destiny tomorrow.”

The Phase A report is the result of technical and cost analysis by Black & Veatch Corp. and the economic analysis by Water Authority staff. The engineering firm conducted similar studies for the Water Authority dating back to 1996, assessing “single use” water-delivery projects in those studies. The current Phase A analysis looks at conveyance projects with multiple partnership possibilities and potential benefits for the environment, water agencies and others.

Two viable alternatives emerge

Three potential pipeline routes were studied in Phase A, and the draft report says two alternatives (3A and 5A) are cost-competitive with other options, such as relying more on Metropolitan Water District of Southern California or developing additional local supplies.

Phase A takes a conservative approach to cost protections, by not factoring in potential partnerships or other sources of funds. However, partnerships and other agreements could significantly reduce the cost and enhance the value of a regional conveyance system. Phase B would include more detailed analysis of potential partnerships and funding opportunities and more details about projected costs from MWD.

“A decision about the Regional Conveyance System cannot be made in the abstract,” said Kelly Rodgers, director of the Water Authority’s Colorado River Program. “It must be made based on a comparison of the available alternatives, and we look forward to additional analysis and perspectives from our member agencies in the weeks ahead.”

The Water Authority currently pays MWD to transport QSA water through the Colorado River Aqueduct to San Diego. The regional conveyance system would be designed to convey the QSA water, which in 2021 will reach its full amount of 280,000 acre-feet of water annually. The current Water Transfer Agreement between the Imperial Irrigation District and the Water Authority continues to 2047. Both agencies can agree to extend the transfer another 30 years to 2077.

Conveyance routes would connect to All-American Canal

Each of the potential conveyance routes would connect to the tail end of the All-American Canal where it meets the Westside Main Canal in the southwest corner of Imperial Valley.

Two of the routes would follow a southern corridor between the Imperial Valley and San Diego, with one route over the mountains paralleling the U.S./Mexico border and the other tunneling through the mountains. Both routes would end at the San Vicente Reservoir in Lakeside.

The third and northernmost route would follow the Westside Main Canal toward the Salton Sea, then flow past Borrego Springs, and through the mountains. It would eventually connect to the Water Authority’s Twin Oaks Valley Water Treatment Plant in San Marcos.

Draft report findings

  • The region will continue to need QSA water through 2112.
  • All three RCS alternatives are viable from a technical and engineering perspective.
  • Alternatives 3A and 5A are economically competitive and provide long-term reliability and low-cost water to the region.
  • Alternative 5C is not economically competitive with Alternatives 3A and 5A and will not be recommended for further study.
  • Alternatives 3A and 5A could be integrated without major changes to current Water Authority operations.
  • Potential multi-agency, multi-use partnerships and other agreements could significantly reduce the cost and enhance the value of each RCS alternative and provide regional benefits to San Diego, California and the Southwest.

To read the report, go to https://www.sdcwa.org/colorado-river-supplies-management.