May 24, 2014

Recycled wastewater from Modesto, Turlock will irrigate crops if $100 million pipeline OK'd

Like that old saying about “one man’s trash being another man’s treasure,” wastewater is becoming a coveted commodity. It’s called “recycled water” now, and Modesto and Turlock need to get rid of it.

Like that old saying about “one man’s trash being another man’s treasure,” wastewater is becoming a coveted commodity.

It’s called recycled water now, and Modesto and Turlock need to get rid of it.

West Side farmers in the Del Puerto Water District, meanwhile, are desperate to use it to irrigate their crops. And apparently they’re willing to bankroll the $100 million cost to pipe the treated water over to their side of Stanislaus County.

The drought is only partly to blame for the ramped-up interest in reusing wastewater, which previously had been flushed from toilets and drained down sinks.

Ever-increasing government regulations and environmental restrictions are making it more difficult and expensive to release that water into the San Joaquin River, even after extensive treatments have removed all the yucky stuff.

Modesto and Turlock already have spent millions on pipes leading west to the river, but now city leaders think there’s a better option than letting that water flow into the San Joaquin.

“This recycled water project will help a neighbor in our county, create some jobs, save some trees and help our economy,” predicted Brad Hawn, a structural engineer and former Modesto city councilman who is consulting on the project. “Our community has got to start getting some wins, and this is a win.”

If everything goes as planned, recycled water will start flowing down the 6-mile pipeline under the river and to the Delta-Mendota Canal by 2018. Del Puerto farmers will take it from there.

Preliminary work on what is called the North Valley Regional Recycled Water Program began four years ago. Drafting of the environmental impact report is about to begin, and the public has until Wednesday to make initial comments about it.

“This is going to be the largest recycled water project in California,” Hawn said. “It’s getting national attention.”

A reliable source

It certainly is foremost on the minds of West Side farmers, who are scrambling to find a reliable, affordable source of irrigation water.

The 45,000-acre Del Puerto Water District is supposed to get water from the federally run Central Valley Project system, but it’s not getting one drop this season.

“If we cannot get a sustainable, reliable source of water we’re not going to be able to continue,” said Jim Jasper, owner of Stewart & Jasper Orchards and a member of the Del Puerto board of directors.

Del Puerto stretches from Vernalis to Santa Nella, including western parts of San Joaquin, Stanislaus and Merced counties. It pulls irrigation water from the Delta-Mendota Canal, which is part of the federal Central Valley Project.

If the pipeline is built as proposed, an estimated 30,600 acre-feet of recycled water could flow into the Delta-Mendota by 2018. Based on city growth projections, the volume would increase to 59,000 acre-feet by 2045.

To cover the pipeline’s $100 million cost, Hawn said Del Puerto farmers would be expected to pay $200 to $250 per acre-foot of recycled water they receive for the first 30 years.

Liquid gold

They’re paying much more than that now.

Del Puerto farmers paid an average $275 per acre-foot for the water they bought last year, said Anthea Hansen, the district’s manager. When Central Valley Project water is available, the federal government charges $60 an acre-foot, but Del Puerto received 20 percent of its allotment last year, and none this year.

Hansen said she’s been trying to buy water this spring for $775 to $1,000 an acre-foot, but “we haven’t finalized any transactions at all yet.”

Because Central Valley Project water allocations keep getting cut back – primarily because of environmental water demands – Hansen said buying enough water to keep crops growing is becoming more difficult every year.

Groundwater in Del Puerto is scarce and of poor quality, so pumping can’t make up the difference.

“This year, we could have as much as 15,000 acres go fallow,” warned Hansen, noting that’s one-third of the district. More than half of Del Puerto’s land is in Stanislaus County. “This recycled water will give us something we can count on in the future.”

Recycled wastewater from tertiary treatment plants is considered clean enough for virtually all uses except drinking. It’s expensive to get it that pure.

Modesto is constructing a $130 million tertiary treatment plant, which is expected to be complete next year and operating by 2016, according to William Wong, acting director of the city’s Utility Planning and Projects Department.

Modesto’s plant is next to the San Joaquin River off Jennings Road.

Turlock built its $35 million tertiary plant in 2006, where it treats water from Turlock, Ceres, Denair and Keyes.

Public debate

Last month, Turlock finished building a $20 million pipeline to carry its recycled water from its plant to the San Joaquin River near South Carpenter Road.

That was a stroke of luck for Del Puerto because now getting Modesto’s and Turlock’s recycled water to the Delta-Mendota Canal is relatively easy. It would entail tunneling under the San Joaquin River and piping along county-owned roads.

In fact, Hansen said drilling the bore and constructing the pipeline is expected to take less time than getting the project approved by government regulators. She said more agencies “than I even knew existed” must grant permission before the pipeline can be built.

Part of the process includes an environmental impact report, and work on that is about to begin. The initial public comment period for that report is open through Wednesday.

So now is the time for people and agencies to object to the project. Some are doing so.

Back in 2002 when Turlock started planning its discharge pipeline, “nobody wanted to partner with us” to bring the city’s recycled water to nearby farms, said Michael Cooke, Turlock’s municipal services director. So the city built the pipeline west with plans to dump the water into the river.

“But the water situation has changed in California and the perception of recycled water has changed, too,” Cooke said.

Now the Turlock Irrigation District wants that water, too.

“TID’s interest in recycled water is part of our overall concern for the stewardship of local water resources,” district spokesman Calvin Curtin said. “We look at recycled water not as just a way to help mitigate the drought, but as a possible long-term component of our water supply portfolio.”

Curtin said TID understands how desperate Del Puerto’s situation is, “but would be remiss if we did not participate in the NVRRWP process and highlight the fact that recycled water can be used to irrigate crops in the Turlock Groundwater Basin and also recharge the basin.”

Possible routes

There also may be public debate over which route the pipeline should take. Two options are being considered.

City officials favor the route that would pipe Turlock’s recycled water north – along South Carpenter Road, West Main Avenue and Jennings Road – to where Modesto’s new treatment plant is being built.

There, Modesto and Turlock recycled water would merge, then be piped under the river. The pipeline would continue west down Lemon and Zacharias avenues to the Delta-Mendota Canal.

The alternate plan is to build two separate pipelines. The northern one would start at the Modesto plant and follow the same route from there. The second, southern route would start where Turlock’s just-completed pipeline ends near South Carpenter Road, go under the river, down Pomegranate and Marshall avenues to the canal.

Wong said both routes would cost about the same to build.

“We’re going to use county right of ways because the pipeline will be next to existing roads,” explained Wong, noting how that will save money because less land would have to be purchased. He said “great technology” exists to drill under rivers, so that wouldn’t be a problem.

The proposed pipeline would be 54 inches in diameter, which would be plenty big enough to accommodate future growth. Wong said it would be a pressurized pipe made of high-density plastic that’s “virtually bulletproof.” It would be buried 8 to 12 feet deep.

Hawn said sending the recycled water to Del Puerto rather than pouring it into the river will end up saving Turlock and Modesto money. That’s “because in the future, the state of California is going to increase requirements” for any water discharged into rivers.

“The savings for the cities will come from the avoided costs of not having to do more water treatments,” Hawn said. The whole county ultimately will benefit, he added, because building the pipeline will create construction jobs, and irrigating with recycled water will save agricultural jobs. “It’s the right thing to do.”

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