Posted on November 21, 2014 by Bob Berwyn
Clearing the roads in Frisco, Colorado.
A little bit of salt on your french fries is fine; a lot of salt on the road kills trees and fish
FRISCO — Highway engineers and scientists know that that massive use of chemical road de-icers has significant environmental impacts. Salt and the various derivatives used to keep roadways open kills trees and degrades water quality.
Just last year, the EPA found salt building up in groundwater near highways in the eastern U.S. Across the country, the U.S. spends $2.3 billion each year on the removal of highway snow and ice plus another $5 billion to mitigate the hidden costs associated with the process.
The hidden costs include long-term impacts of salt, sand and chemical deicers on the natural environment and road infrastructure as well as short-term impacts on semi-trailer trucks and other vehicles from rust and corrosion. Continue reading
Filed under: air quality, Environment, I-70, transportation, water quality | Tagged: Environment, road de-icers, road salt, transportation, water quality | 1 Comment »
Posted on November 20, 2014 by Bob Berwyn
Calcium loss turning lakes to ‘jelly’
Acid rain has fundamentally changed the chemistry and biology of some lakes.
Tiny jelly covered plankton are displacing other organisms in some Canadian lakes to the detriment of fisheries and public water supplies. Photo courtesy Michael Arts, Canada Centre for Inland Waters.
FRISCO — The toxic legacy of acid rain lives on in lakes in Canada, and possibly other places around the world, according scientists who say they’ve traced a trend of reduced calcium levels leading to a “jellification” of some lakes.
Specifically, the changes in water chemistry have reduced populations of calcium-rich plankton such as Daphnia — water fleas that dominate these ecosystems. Falling calcium levels mean Daphnia cannot get the nutrients they need to survive and reproduce, leading to a rise in other plankton species, including small jelly-clad organisms.
According to the new research, populations of those organisms has exploded in lakes across eastern Canada in the past 30 years. The average population of these small invertebrate jellies in many Ontario lakes doubled between the mid-1980s and the mid-2000s. Continue reading
Filed under: Environment, water, water quality | Tagged: acid rain, Canada, Environment, Plankton, water quality | 1 Comment »
Posted on October 22, 2014 by Bob Berwyn
Signs of oil and gas development are visible on a landscape level from 35,000 feet in the air.
Stable tracers can help pinpoint ground and surface water contamination
FRISCO — There’s more and more evidence that fracking wastewater can — and sometimes does — pollute ground and surface water, but it’s not always easy to trace the pollution, especially since drillers often keep secret their fracking fluid recipes.
But after field tests at a spill site in West Virginia and downstream from an oil and gas brine wastewater treatment plant in Pennsylvania, scientists say they can reliably identify hydraulic fracturing flowback fluids that have been spilled or released into the environment by using stable boron and lithium tracers that distinctive chemical fingerprints. Continue reading
Filed under: energy, Environment, fracking, gas drilling, oil drilling | Tagged: Environment, fracking, groundwater pollution, water quality | 1 Comment »
Posted on October 21, 2014 by Bob Berwyn
Fish-eating ospreys not showing signs of contamination
Ospreys so far are not picking up significant amounts of pharmaceutical pollution found in many streams and rivers around the world. bberwyn photo
FRISCO — Pharmaceutical compounds from makeup and drugs are turning up in streams and rivers all over the world, even in remote Yucatan cenotes, but for now, they don’t seem to be working their way up the food chain.
The chemicals have been finding their way into the environment, primarily through wastewater, urban runoff and even biosolids applied to agricultural lands, but he impact on wildlife is unknown, so researchers with the U.S. Geological Survey and Baylor University teamed up to try and track the pollutants through the food chain by testing ospreys. Continue reading
Filed under: Environment, water, water quality | Tagged: bioaccumulation, Environment, ospreys, pharmaceutical pollutants, water quality, wildlife | Leave a comment »
Posted on October 16, 2014 by Bob Berwyn
Is there mercury in your trout?
National assessment by USGS pinpoints regional mercury hotspots
FRISCO — Widespread mercury contamination is one of the many signs of continued global environmental degradation. Currently, there are fish consumption advisories for mercury in all 50 states in the U.S. Methylmercury concentrations in fish exceed the human health criterion in about one in four U.S. streams.
A new USGS report takes a comprehensive look at mercury contamination in streams across the United States, finding the highest concentrations in the Southeast and in the West, where some streams were degraded by historic mining activities.
Mercury is a potent neurotoxin that accumulates in fish to levels of concern for human health and the health of fish-eating wildlife. Much of the mercury originates from combustion of coal and can travel long distances in the atmosphere before being deposited. This can result in mercury-contaminated fish in areas with no obvious source of mercury pollution. Continue reading
Filed under: Environment, rivers, water, water quality | Tagged: Environment, mercury pollution, mercury stream assessment, USGS, water quality | 1 Comment »
Posted on October 6, 2014 by Bob Berwyn
How pure is your groundwater?
Iowa stream sampling shows common drugs turning up in well water
FRISCO — Research in a small stream near Des Moines, Iowa shows how pharmaceuticals and other hard-to-remove pollutants from treated municipal wastewater can travel into shallow groundwater following their release to streams.
“Water level measurements obtained during this study clearly show that stream levels drive daily trends in groundwater levels,” said Paul Bradley, lead author of the new U.S. Geological Survey study. Continue reading
Filed under: Environment, rivers, water, water quality | Tagged: Environment, groundwater, Persistent organic pollutants, pharmaceuticals, water quality | 1 Comment »
Posted on September 19, 2014 by Bob Berwyn
Microbeads are pathway for other environmental contaminants
FRISCO — Microplastics have long been documented as an environmental threat to oceans. European researchers recently warned of similar problems in Italian lakes, and now, Canadian scientists say they’ve found 2-millimeter plastic microbeads widely distributed along the bottom of the St. Lawrence River.
The team of researchers from McGill University and the Quebec government published their study this month in the Canadian Journal of Fisheries and Aquatic Sciences.
The paper explains that the pollution probably comes from cosmetics, household cleansers, or industrial cleansers, to which they are commonly added as abrasives. Owing to their small size and buoyancy, they may readily pass through sewage treatment plants. Microplastics are a global contaminant in the world’s oceans, but have only recently been detected in the surface waters of lakes and rivers. Continue reading
Filed under: Environment, rivers, water, water quality | Tagged: plastic microbead pollution, Stt. Lawrence River, water polluton, water quality | Leave a comment »