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Jack Lynch, Editor
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March 2, 2010
Historic Snowfall, Road Salt, Watershed Protection and the Chesapeake Bay
Recovering from the forced lassitude of the snowfalls in Frederick, I had the opportunity to take a ride out to Cambridge, Maryland with Tim Goodfellow of the Frederick County Planning Department, as an initiative of the Monocacy Scenic River Board to visit the university of Maryland Center for Environmental Science at Horn Point on the Choptank river, near its mouth on Chesapeake Bay. Our mission was to engage the Center staff in providing technical assistance in creating a more scientific Monocacy River Report Card.
Along the way, seeing the impacts of the snowfalls from the drive through the state, which lingered along the roadsides, the plowed, piles of snow, mounded in great dark, blackened heaps – led me to think about the composition of those contaminants, and how they eventually flow right into our waters.
My first suspicion was that the black particulate comprised the atmospheric deposition of automobile exhaust pollutants. Which is correct, and many studies have been conducted in recent years demonstrating the various impacts of these air pollutants on streams, based on both their long range drifts across the Eastern seaboard from the Midwest, and their immediate sources in parking lots and along highways.
The Center for Watershed Protection provides a discussion paper on these effects and on road salt use in the region. It says, in part:
“Annual road salt use has gradually increased over the last two decades, and now fluctuates between 10 and 20 million tons per year on a nationwide basis,
In our region, about 20 tons of road salt are applied to each mile of four lane highway, in a normal year. While exact statistics are not available for the total amount of road salt used across the Chesapeake Bay watershed, we conservatively estimate that about 2.5 million tons are applied each year. This is a lot of salt. To put this in perspective, consider that if all this salt were dissolved in a container of fresh water, it would make more than 15 billion gallons of seawater. Or to put it another way, the entire volume of the tidal Chesapeake Bay (51 billion cubic meters) typically contains about 250 million tons of chloride at any given time.
In addition, road salt contains many impurities. As much as 2 to 5% of road salt consists of other elements, such as phosphorus, nitrogen, copper, and even cyanide. A form of cyanide is added to road salt as an anti-caking agent (about 0.01% dry weight). Under certain conditions, it can be transformed into free cyanide, which can be very
the snow pack gets grey and dirty in urban areas, particularly along the roadside. Road slush, salt spray, airborne pollutants, street dirt, and trash all accumulate in the snow pack over days and weeks. When the snow pack melts, it releases many pollutants to the stream, including sediments, nutrients, zinc, copper, lead and hydrocarbons and chloride. During the melt, pollutant concentrations in storm water runoff are among the highest seen all year.”
But beyond the salt issue, the heavy metal pollutants, and particularly, for the Chesapeake, the nitrogen deposition on roads from autos is particularly an acute problem. Beyond waterways, it is air pollution that we breathe every day with increased incidences of asthma and breathing disorders.
Since my childhood, the Washington region has decreased the summer temperature inversions and associated low level atmospheric trapping of pollutants, resulting in code red warning days and free transit rides. Yet even when the air is at its polluted normal and considered healthy, the air pollutants fall and they eventually run off if they are not fully absorbed by chemical means in soil and green growth.
My thoughts now connect to another watershed activity. An environmental forum sponsored by Baltimore Greenworks, and the Herring Run Watershed Association, at the Baltimore Museum of Industry last Saturday.
A distinguished panel included Chuck Fox, Senior Advisor on the Chesapeake Bay, EPA; Halle Van der Gaag, Director, Jones Falls Watershed Association; Ned Tillman, Author of The Chesapeake Bay: A Sense of Place, A Call to Action; Tom Horton, Author of Turning the Tide: saving the Chesapeake Bay; John Campagna, Principal, Restore Capital; and Celeste Amato, Director, Baltimore City’s Cleaner Greener Office.
As reported in the Baltimore Sun, Activists remain hopeful about Chesapeake Bay, it was the hopeful focus of individual action that was projected, but it came out of a clear recognition of the utter failure to employ thirty years of limited efforts towards a successful outcome for the Chesapeake Bay’s water quality.
Gerald Winegrad, a former Maryland state Senator for sixteen years, lawyer and educator, repeated several times, while showing slides that depicted the pollution and fishery failures of the bay, that the government has broken its clean air and water laws. Simply ignored the law, and allowed us to reach a point that a turnaround, rather than another intermediate goal, was required.
- chart graphics are from presentation on Baltimore Greenworks website
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