CDOT contests severity of Dillon chemical discharges | SummitDaily.com

CDOT contests severity of Dillon chemical discharges

On at least three occasions documented by a whistleblower this summer and described in a July 28 story in the Summit Daily, a contractor for a repaving project in Dillon allowed prohibited materials to seep into area drains due to insufficient control measures.

Such controls are a necessity to prevent pollutants from entering state waters — in this case along U.S. Highway 6 into the lower Blue River, and from there the Colorado River. And according to Dillon officials, mitigation devices to prevent oil discharge exist in inlets on one side of the highway but not on the other. The result is any illicit materials could pass through unfettered and head downstream.

"Not knowing precisely where the spills are — in some cases it would be protected, in some cases it wouldn't," said Scott O'Brien, Dillon's public works director. "The town doesn't have any regulatory authority over this project. We're really relying on CDOT to make sure that standard policies are followed."

The Colorado Department of Transportation acknowledged separate water-related incidents on the repaving project near the Dillon Ridge Shopping Center where contractor APC Southern Construction Company had inadequate controls in place. In one instance on May 8, for example, liquid asphalt ran into the drains due to a heavy rainstorm, followed by more materials leaving the site in July from further noncompliance.

“We don’t live in a perfect world. But the quantity of spills really matters. It totally matters if it’s a teaspoon of concrete versus 500,000 gallons.”Grant AndersonCDOT’s resident engineer

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In response to a Summit Daily inquiry, CDOT initially stated a stop-work order, which halts all operations, issued on July 20 after a subcontractor was photographed dumping at least a gallon of wastewater from a bucket into a storm outlet the day before. A subsequent letter sent to the Daily by CDOT's regional engineer confirmed two additional stop-work orders during the course of the project to bring it back up to proper code.

"These stop-work orders should not be considered an oversight on the part of CDOT," wrote Grant Anderson, CDOT's resident engineer for the region. "Rather, they are firm and proactive measures to ensure the protection of water resources."

CDOT also took issue with the Daily's spotlighting these prohibited discharges, reiterating that although they did occur, they did not officially meet the criteria of a spill according to the Colorado Department of Health and Environment. Pictures and videos provided by the whistleblower showed pools of water containing liquid asphalt, remnants of concrete and oil slicks all going down nearby drains.

"They had some isolated incidents, which were problems," Anderson added by phone. "We don't live in a perfect world. But the quantity of spills really matters. It totally matters if it's a teaspoon of concrete versus 500,000 gallons."

Beyond that, the reporting of chemical and other pollutant spills into stormwater drains from road paving projects is not mandatory for the bulk of Colorado's High Country. This includes headwater regions like Summit County.

Federal regulations adopted through the Environmental Protection Agency in the 1970s under the Clean Water Act require informing the proper response agency of any petroleum discharges. However, the state's health department provides exemptions in situations where the threat to water quality is deemed "low risk." The releases of oil-based paving materials, concrete runoff and equipment wash water in Dillon fall into this category, therefore avoiding the official definition of a spill.

In addition, Summit County does not fall under an elevated discharge permit mostly due to its rural composition, which means all construction projects here have a higher threshold for when pollutants must be reported. Aside from Colorado's heavily populated urban counties, only Grand Junction and Steamboat Springs within the Western Slope presently maintain this designation.

State and local officials noted that the reality of both road construction and general use of automobiles is that small amounts of chemicals often enter Colorado waterways. Banned substances like drops of oil, leaks of antifreeze and bits of rubber from tires left on roads or in parking lots are frequently sent into drains every time there's a rainstorm.

"Pollution of waters inherently results from activities by humans and in nature," said Meghan Trubee, a spokeswoman for the state's Water Quality Control Division. "Activities in the installation and maintenance of pavement involve the use of products that can result in incidental discharge to stormwater systems."

Still, the emphasis remains preventing as much of these materials as possible from going down the drain. And whether Summit and other neighboring Western Slope communities meet the qualifications for ramped-up safeguards, regional authorities on water expect best efforts and management practices in place to avoid potential consequences down the road.

"There's a lot of behaviors around vehicles and pavement that happen, but it doesn't mean that they should be happening," said County Commissioner Karn Stiegelmeier. "A little bit here and a little bit there, it really does impact the aquatic ecosystem, and maybe creating a bigger problem than we're aware. We don't have authority in a situation like that, but we certainly hope that CDOT would work with us to prevent water pollution, especially in the headwaters."