Environment Report: EPA Narrows Border Pollution Projects to Three | Voice of San Diego

Science/Environment

Environment Report: EPA Narrows Border Pollution Projects to Three

Scientists identify link between wildfire smoke and COVID-19 infections and deaths, the county is still mulling over which community choice energy program to join and more in our biweekly roundup of environmental news.

Tijuana River
A tributary near the U.S.-Mexico border where sewage from Tijuana flows through. / Photo by Adriana Heldiz

My border-reporting colleague Gustavo Solis reminded us recently of the slow-going on solving the Tijuana River cross-border sewage problem despite more than a year of work by the U.S. Environmental Protection Agency to design a fix. As he put it, there’s been “little action” following an announcement that federal officials would be dolling out considerable cash.

That’s not the whole story.

There’s a proverbial $300 million check from the federal government to build something that will help stop raw Tijuana sewage from flowing into the United States (where it shut down public shoreline in Imperial Beach for almost half of 2020), and yes, we’re still waiting to hear what they’re going to spend it on.

But we got more clarity on Aug. 6, when the EPA said it had whittled down a list of about a dozen project ideas to three.

One option, which I’ll call “the whole hog” but the EPA calls the “comprehensive alternative,” would cost the United States a whopping $566 million. That’s because it tackles the EPA’s top projects on both sides of the border.

While it scored lowest in terms of cost effectiveness, it’s the only option that could keep Imperial Beach open almost all summer and reduce the most sewage (76 percent of it) from flowing over the border into the U.S. side of the river.

The plan involves something called river diversion, which basically amounts to running the river on the U.S. side through a new treatment plant (called advanced primary treatment) so that raw sewage doesn’t make its way to the Pacific Ocean (and Imperial Beach). That means the U.S. wouldn’t have to worry as much about spills from Tijuana’s unreliable sewage system.

The plan also builds a larger international wastewater plant to treat more of Mexico’s sewage (it was built too small to begin with), one of the top concerns of Imperial Beach residents from the start of this debacle.

It also calls for some other bells and whistles to tighten up the leaky watershed, for instance, in the border’s natural canyons, which collect a lot of polluted water flowing outside any riverbed or pipe. The plan adds a trash boom to the river’s flow to catch the junk that often clogs the sewer and river system. And it funnels U.S. dollars toward projects in Mexico like recycling some of the city’s wastewater for reuse and finally fixing a broken wastewater treatment plant where untreated Tijuana sewage flows directly into the ocean.

There are two other options, cuts of the whole hog, on the table. Each would curb less pollution but cost closer to the $300 million price tag (while still going over the budget).

The second option cuts Imperial Beach closures by 74 percent and more than half the over-the-border spills. It does everything but treat the whole river on the U.S. side and fix the broken Mexican plant — which EPA officials stress is the main problem for Imperial Beach in the summertime.

The third option doesn’t put U.S. money toward fixing the Mexican plant but treats about half the river water. It reduces over-border spills and polluted beach days by about 64 percent each.

Doug Eberhardt, who was the infrastructure section manager for U.S. EPA Region 9’s Water Division and worked on this issue since the ’90s, told me treating a whole river is not a common thing.

Think of it like a combined sewer system, which are more common in the Midwest where I’m from. Instead of separate pipes for sewage and stormwater (the water that runs into street drains when it rains) all that water goes through one pipe — or in this case, one river — to a treatment plant.

“A big issue here is, what’s the strategy?” Eberhardt said. “Do we try to treat the sewage before it gets into the river or do you use the river as your collection system and let the sewage get into the river,” then treat it.

Meanwhile, the Tijuana Slough Shoreline, the U.S. beach closest to the border, closed again on Aug. 8 after it failed a water quality test performed by San Diego County. (It’s since been reopened.)

In Other News

  • People were mad about water rates in Valley Center. So the general manager of its municipal water district wrote a blog post explaining the different types of water charges, which I found educational for any ratepayer. (Valley News)
  • Carolyn Cole wrote this hauntingly beautiful piece endeavoring to explain an uptick of gray whale deaths along the North American coast, including two recently found plastered to the hull of an Australian warship in San Diego. (Los Angeles Times)
  • In other docile creature news, whatever intern at CBS News wrote this tweet insinuating leopard sharks in La Jolla Cove are something to be worried about should probably run a correction. But I’m sure they’re not getting paid enough either. (CBS News)
  • As San Diego dips further into wildfire season, it should be known that Harvard scientists found a link between wildfire smoke and an increase in COVID-19 infections and deaths. (Washington Post)
  • San Diego County is still mulling over which community choice energy program to join but finally began formal discussions with both. (Union-Tribune)
  • Cut flowers, fruit and nut crops — San Diego County’s top agricultural crops — are doing well. But wine grapes saw a drop in value after three years in gains. (Water News Network)
  • In case you missed it, the International Panel on Climate Change let us know that we’re probably going to blow past a critical level of global warming, the effects of which we hoped could be reversible.
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