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A woman catches rays while her dog swims at a Riverbend sandbar adjacent to Duke Energy’s “mixing zone,” where they return wastewater with high levels of arsenic. (Photo credit Skip Hudspeth)

A woman catches rays while her dog swims at a Riverbend sandbar adjacent to Duke Energy’s “mixing zone,” where they return wastewater with high levels of arsenic. (Photo credit Skip Hudspeth)

About that arsenic in your water... 

Filtering the facts

Lake Norman, Mountain Island Lake, Lake Wylie (a.k.a. the Catawba River) — all of that water belongs to you. And by "you," I mean "We The People."

That water is the same water flowing through pipes into your homes and businesses and into your bodies. Your government is supposed to be protecting it. So, why is Duke Energy allowed to drain arsenic into it? Because coal ash, that's why.

When the company exceeded the U.S. Environmental Protection Act's arsenic standard in 2004, 2010, 2012 or earlier this year it was totally legal. And Duke didn't break the law on June 20, 2016, either, when the arsenic levels draining out of its waste into your drinking water reservoir — Mountain Island Lake — was recorded at more than nine times the federal safety standard. Why? Because it has a permit.

Arsenic is poisonous, but there's no limit placed on how much of it Duke is allowed to drain into your drinking water reservoir. And yet the company has to drain its coal ash dumps at its Riverbend coal plant into Mountain Island Lake; it's part of the cleanup process, a necessary evil. Besides, there's a deadline to keep.

Remember the 2014 Dan River spill and the federal investigation that followed? Remember when Duke pleaded guilty to nine criminal violations of the Clean Water Act last year? The cleanup is part of that ongoing aftermath.

Following the spill, the General Assembly passed the Coal Ash Management Act, (CAMA) which Gov. Pat McCrory, a former employee of Duke Energy for 29 years, allowed to become law sans his signature. The act created a classification system that established cleanup deadlines. For the Riverbend plant, that deadline was December 2019. Since there's roughly 3.6 million tons of coal ash there, it's going to take a minute to haul it away. But before that can happen, the company must drain the water from it, even though that means discharging arsenic into your water.

On July 15, McCrory signed House Bill 630 into law. The new law eviscerates CAMA and will allow Duke Energy to cap some existing coal ash ponds in North Carolina once deemed intermediate-risk, rather than excavate them. Regardless, due to other factors that include lawsuit settlements among other things, the clean-up at the Riverbend site will continue.

Before your water is sucked out of the lake, it's tested many times, then tested many times more at the treatment plant. Mecklenburg County and Charlotte Water are paying close attention, but they're powerless. There are currently no local ordinances limiting arsenic levels and HB 630 bans local governments from passing any.

Still, Mecklenburg County intensified its monitoring of the lake's surface water near the Riverbend coal ash dumps way back in 2004, years before any of us had ever heard of the stuff. Since then, Rusty Rozzelle, a program manager for Mecklenburg Water Quality, says, "We've had six exceedances of the surface water quality standard for arsenic, which is 10 parts per billion." Those exceedances ranged from 16 ppb to 92 ppb, which is what his team recorded on June 20.

click to enlarge riverbendmap.jpg

Rozzelle shares the county's monthly monitoring data with Charlotte Water. Collectively, they determine if the water is fine or not. And it is. The N.C. Department of Environmental Quality (DEQ) agrees with them, as does Duke Energy and EPA, according to its drinking water standards and its 2011 National Pollutant Discharge Elimination System (NPDES) permit that doesn't limit the amount of arsenic Duke can discharge.

Arsenic is heavy; it sinks. So, it's no surprise that when DEQ "investigated" on July 7, weeks after Duke Energy stopped discharging its wastewater due to the spike, no arsenic was found in the surface water. But arsenic doesn't magically disappear once it's released into the water. It can dilute and drift off, it can hook up with a bit of sediment and sink or settle on a bank. But it doesn't vanish.

In the summer, the oxygen beneath the water's surface is depleted and the arsenic there morphs into arsenic trioxide. According to the Agency for Toxic Substances and Disease Registry (ATSDR), "Small amounts of arsenic trioxide can lead to multiple organ damage and death."

Dr. Avner Vengosh, of Duke University's Nicholas School of the Environment, has been researching coal ash and publishing peer-reviewed studies on his findings in academic journals at the rate of about one per year since finding that the coal ash from the disaster in Tennessee could harm the environment seven years ago.

In 2012, one of Vengosh's reports stated, "In Mountain Island Lake, a primary source of drinking water for Charlotte, pore water samples collected from lake sediment during the summers of 2010 and 2011 contained up to 250 parts per billion of arsenic – roughly 25 times higher than current EPA standards for drinking water, and nearly twice the EPA standard for aquatic life."

I keep asking DEQ if they're paying attention to Vengosh's coal-ash research, but they don't bother to answer when asked if they're aware of his latest study. He says they haven't called. (Vengosh has also reported on the waste's radioactivity, found ways to trace contamination back to individual coal ash dumps and discovered new ways to monitor the waste.)

The reports on arsenic — from Duke University and Mecklenburg County — are no surprise to Duke Energy. The company monitors its wastewater, too, and was already aware of the spikes. They had noticed an "upward trend" in arsenic levels, according to spokesperson Zenica Chatman. She also said when the county confirmed the latest, largest arsenic spike, the company stopped discharging wastewater from the coal ash basins. They'll resume in September, but this time with a filtration system, she said.

I asked why the company didn't stop discharging the wastewater when it noticed the upward trend, especially in the summer when there is less oxygen in the lake.

Chatman replied, in part: "The sample point where the elevated levels occurred was very close to the plant in the cove, which is our 'mixing zone' — an area that the state allows a permitted industry to return wastewater. Levels need to meet the state surface water standard (10 ppb) outside that area in the main channel of the lake, which had never been affected. If we had started to observe increasing levels in the main channel of the lake, that would have been our signal to suspend the process sooner."

The thing is, that cove is adjacent to "the sandbar," a popular summertime hangout.

Still, Charlotte Water says the water is fine. And it is; it should be. I mean, I can only go by what they report, and they say there is no arsenic in your drinking water.

Hey, they drink it. I drink it. We're in this together. Right?

For clarification, the above map shows the distance (798 feet) between the mixing zone where Duke has drained wastewater from its coal ash ponds and the sandbar where people regularly swim and fish.
  • For clarification, the above map shows the distance (798 feet) between the mixing zone where Duke has drained wastewater from its coal ash ponds and the sandbar where people regularly swim and fish.
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