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California County Shuts Down Fifth of Water Wells Over PFAS

California wants to slash the allowable levels in drinking water for two “forever chemical” compounds, immediately prompting agencies supplying water to 2.5 million residents in Orange County to remove a fifth of their wells from service.

The State Water Resources Control board Thursday said it planned to dramatically lower its response levels for perfluorooctanoic acid (PFOA) and perfluorooctanesulfonic acid (PFOS), though actual drinking water standards are still years away.

The response levels require water suppliers to install treatment, and remove wells from service if they exceed the thresholds. Notifying customers is required if districts plan to keep wells in service without treatment for an extended period.

Orange County oversees the area’s groundwater basin and provides water to 19 agencies, which rely on underground supplies for 77% of deliveries. The remainder comes from the Colorado River and Metropolitan Water District of Southern California, which supplies water to 19 million people in the region.

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‘Baking Skills’ Used for Repair at Lake Hodges Pumped Storage Facility

You might not think ‘baking skills’ would come in handy to fix a recent problem at the Lake Hodges Hydroelectric and Pump Station Facility. But those skills, along with initiative and ingenuity, were demonstrated by San Diego County Water Authority staff as part of the creative and complex repair.

The facility connects the City of San Diego’s Hodges Reservoir with the Water Authority’s Olivenhain Reservoir. The connection provides the ability to store up to 20,000 acre-feet of water at Hodges for emergency use.

The Lake Hodges Hydroelectric and Pump Station Facility moves water between Olivenhain and Hodges, and is able to generate up to 40 megawatts of energy on demand, helping to manage electrical demands throughout the County. It also generates revenue and helps offset energy costs.

Ground fault alarm alerts staff

A ground fault alarm on August 25, 2019 alerted staff to a potential problem with Unit 2, one of the facility’s two 20-MW pump-turbine units. A series of tests and inspections by staff with the Water Authority’s Rotating Equipment team discovered the insulation on the copper bus bars of the generator’s rotor were worn and damaged. The bus bars are part of a system that provides DC power to the 12 electromagnets which surround the outer surface of the pump turbine unit’s rotor.

The rotors are designed to spin at 600 revolutions per minute and it’s the rotor’s electromagnets acting upon the stators windings that generates power. The electromagnets are connected together by copper bus bars located on top of the rotor and the bus bars are secured to the rotor by clamping plates and rim studs. The bus bars are insulated to ensure the copper does not touch any other metal surface and cause an inadvertent ground fault.

“Although a single ground fault may not damage the pump-turbine unit, it may prevent it from starting, if two ground faults were to occur, significant damage to the pump-turbine unit would occur and would also be an extreme danger to anyone within the facility,” said Jim Fisher, Water Authority director of operations and maintenance.

Creative solutions and ingenuity save time, money

Among various factors, the primary cause of the insulation failure was determined to be improper wrapping and curing of the insulation during initial installation.

Water Authority staff developed solutions and also took on the repair tasks in September. By doing the work in-house, the Water Authority avoided a more extensive outage due to long lead times required by contractors and vendors to perform the same work, saving time and money.

“Staff did an excellent job maintaining the operation of Unit 1 while making the repairs to Unit 2,” said Fisher, “which allowed the Water Authority to avoid a total shutdown and loss of all revenue during this period.”

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Initiative and ingenuity by San Diego County Water Authority staff led to a creative repair solution at the Lake Hodges Hydroelectric and Pump Station Facility. Photo: San Diego County Water Authority

‘Baking skills’ come in handy to create new bus bars

New copper bus bars were fabricated, and each had to be precisely wrapped by 5 different types of insulating tape materials. This wrapping process alone took approximately 8 hours per bus bar. The bus bars were then baked for ten hours within newly designed and fabricated aluminum molds to ensure proper pressure was applied to the insulation layers during the baking and curing process.

Staff efficiently re-purposed and utilized an oven that had been retained from the San Vicente Dam Raise Project to perform the baking. The Rotating Equipment team’s efforts produced excellent quality results which would have been difficult even for a vendor to meet. The newly insulated bus bars were re-installed, and the unit has been operating safely and without issues.

The initiative, ingenuity, and highly technical skills and knowledge of our staff were once again on display throughout the repairs,” said Fisher. “Their dedication, talents and outstanding efforts continue to ensure the Facility’s efficient and safe operation.”

Unit #2 was tested and placed back into service on November 17, 2019.

Along with the bus bar insulation and curing process repair, staff also performed many other highly technical, innovative and precise processes to complete this repair work.

Blog: Imperial Valley Conservation Efforts Benefit San Diego, Southwest

The San Diego County Water Authority’s Board of Directors visited the Imperial Valley January 30 for a day-long tour that highlighted areas critical to the agency’s Regional Conveyance System Study.

Meet the Veteran Insider Who’s Shepherding Gov. Newsom’s Plan to Bring Climate Resilience to California Water

Shortly after Gov. Gavin Newsom called on state agencies to deliver a Water Resilience Portfolio to meet California’s urgent challenges — from unsafe drinking water, flood and drought risks from a changing climate to severely depleted groundwater aquifers and declining native fish populations — he appointed Nancy Vogel, a former journalist and veteran water communicator, to get it done. In an interview with Western Water, Vogel explains how the draft portfolio released Jan. 3 came together and why it should matter to average Californians.

Pure Water Monterey Gets Final State OK

Pure Water Monterey has finally secured a critical final state approval and is poised to begin delivering potable recycled water to the Seaside basin by mid-February.

After an all-day inspection of the $126 million recycled water project’s advanced water purification facility by a nine-member team on Tuesday, the state Division of Drinking Water signed off both verbally and by email.

2020 Snow Report

A new Climate Central report analyzes snowfall trends over the past fifty years, finding that snowfall has been decreasing in the spring and fall seasons across much of the U.S. but with clear regional differences.

The impact of climate change on snow can be a tricky story to tell. While warming winters would suggest that more precipitation will fall as rain instead of snow, a warming climate is also associated with increased precipitation which, in cold regions, can lead to an increase in snowfall. A new report from Climate Central aims to make sense of this challenging subject—analyzing snowfall data collected between 1970 and 2019 from 145 stations across the country.

Sweetwater Authority Eyes Recycled Water That Otay Water District Doesn’t Use

Sweetwater Authority’s governing board has its eyes on recycled water — specifically, an excess of recycled water that a neighboring water agency, the Otay Water District, buys from the city of San Diego.

The governing boards of the two water agencies, which combined serve southern and eastern San Diego County, recently created a joint committee to explore a potential arrangement that would allow
Sweetwater to purchase recycled water from Otay.

The board presidents of both water agencies said the idea could benefit customers on both ends.

The Toxic Legacy of Old Oil Wells: California’s Multibillion-Dollar Problem

Across much of California, fossil fuel companies are leaving thousands of oil and gas wells unplugged and idle, potentially threatening the health of people living nearby and handing taxpayers a multibillion-dollar bill for the environmental cleanup.

From Kern County to Los Angeles, companies haven’t set aside anywhere near enough money to ensure these drilling sites are cleaned up and made safe for future generations, according to a months-long data analysis and investigation by the Los Angeles Times and the Center for Public Integrity.

Opinion: Why Desalination Can Help Quench State’s Water Needs

If you’ve ever created a personal budget, you know that assigning your money to different investment strategies is a crucial component to meet your financial goals. When you stop dipping into your savings account each month, savings can begin to build.

Understanding why desalination is so critical to California’s water future is a lot like building a personal budget. With a changing climate, growing population and booming economy, we need to include desalination in the water supply equation to help make up an imported water deficit.

(Originally published in CalMatters: https://bit.ly/39pNkuD)

 

 

New Treatment System to Bring Clean Drinking Water to Rural Community in California

Hillview Water in Raymond, California will begin delivering clean drinking water with the installment of a Microvi MNE nitrate treatment system by Microvi Biotech. Hillview Water serves a rural community that has been plagued with high levels of nitrate contamination for years.

Nitrate is one of the most widespread contaminants in groundwater globally and can have significant human health impacts.