As seen in USA Today, MSNBC, Dr. Oz, and the Chicago Tribune.


Coal Tar Sealant Runoff Remediation Study Underway

Bioretention Photo Courtesy of US Navy While some continue to debate the reality of coal tar sealant pollution, it is good to see rese...

Bioretention Photo Courtesy of US Navy
While some continue to debate the reality of coal tar sealant pollution, it is good to see research focusing on remediation of polycyclic aromatic hydrocarbon (PAH) pollution from this and other sources. The nation has a lot of cleanup to do and improving our means and methods of dealing with it in a cost effective way is critical.  

One such approach is to use green infrastructure techniques to remediate PAHs. It has long been known that a living and active plant-soil matrix can break down many PAHs.  But how effective is it?This is what researchers at Washington State University intend to find out in an upcoming study as described by the university below.  

One suggestion is the research should seek to understand not just removal, but also the fate of the PAHs.  The last thing anyone wants is a proliferation of treatment devices that ultimately become waste repositories that are expensive to remediate later on.  This is the lesson all should learn from the greater Minneapolis area's experience with detention pond remediation that has estimated cleanup costs of at least $1 billion dollars.  See here for a related story The High Cost of Cheap Coal Tar.

Scientists at the WSU Puyallup Research and Extension Center are testing a method known as “soil bioretention” to eliminate the toxic effects from highway runoff. “Vehicle exhaust often contains dangerous levels of polycyclic aromatic hydrocarbons (PAHs), which are known to cause heart and cardiovascular defects in animals,” said Jen McIntyre, lead WSU Puyallup stormwater researcher. “We want to eliminate or lower the PAHs to create a healthier environment for aquatic life and the general population.”

The group is simulating brief rainstorms by using sprinklers on a 27-foot x 44-foot area of pavement. The plot, treated with coal tar sealcoat (CTSC) commonly used throughout much of the country–but not in Washington State–contains many of the same PAHs as urban highway runoff.

Traffic counters record the number of vehicles passing over the site during the test period since abrasion is a major source of contamination to runoff from seal-coated surfaces. “After the runoff is collected it will be transported to a greenhouse with large bioretention soil columns,” said McIntyre. “Half of the water will be kept as untreated runoff. The rest will be passed through the soil columns as a kind of biological filter that mimics what happens when runoff infiltrates the ground.”

During the six-week study, fish and aquatic invertebrates will be exposed to both raw runoff and that which has been run through the bioretention system to see if the toxicity is eliminated. Findings from the study, funded in part by EPA Region 10 and the NOAA Coastal Storms Program, will be published in a peer-reviewed scientific journal and presented at local and regional conferences to raise awareness of stormwater contamination and increase understanding about the role of PAHs in runoff toxicity and the benefits of bioretention to clean up urban runoff.

Find out more about the Puyallup stormwater research program at



2016,49,ABC's,8,Action,53,airport,3,alternatives,6,Althoff,1,AMA,1,American Coating Association,2,Anacostia,1,Andover,1,applicator,1,APWA,1,ASCE,1,Asphalt Institute,1,ASTM,1,Austin,27,Austin Chronicle,1,ban,135,bans,5,Baylor,9,benzo[a]pyrene,1,Boca Raton,1,Boone,3,Burke,1,California,11,CalTrans,1,Canada,6,cancer,23,Cheh,1,Chesapeake Bay,1,Chicago,7,Chicago Sun Times,1,Chicago Tribune,7,china,1,Cleveland,2,coffee-tea test,3,Congress,6,Connecticut,2,consumer,1,cost,11,costs,1,Dallas,1,Dane County,1,Data Quality,1,Daughtry,4,DC,1,DDT,1,Deep Water Horizon,1,Delaware,1,Department of Defense,1,Department of Interior,2,District of Columbia,7,Doggett,17,DuPage River Salt Creek,2,Ed Burke,1,Edwards Aquifer Authority,3,Ellison,2,Emancipation,1,enforcement,6,environmental justice,1,EPA,31,EU,1,FAA,6,FAQ,14,field test,1,fish kill,3,Florida,2,Frockt,2,German Federation,1,Gowanus,2,Great Lakes,4,Gregoire,1,Hansen,4,Hawthorne,2,health,62,Hoffman Estates,1,Home Depot,1,Huffman,7,IARC,1,Illinois,27,Indiana,2,industry,68,Jeffords,1,Kansas,3,Keating,2,Lindsay,2,Long Island,1,Lowes,1,Mackerer,1,Madison,1,Maine,9,map,2,Maryland,8,Massachusetts,3,McDermott,1,McHenry,1,McHenry County,2,MCPA,1,Men's Health,1,Michigan,9,Milwaukee,1,Minneapolis,1,Minnesota,32,Mississippi River,2,Missouri,6,Montgomery County,3,Morgan State,1,MPCA,23,MS4,1,MSDS,1,MSNBC,2,national pavement contractors association,1,National Research Council,1,New Hampshire,4,New York,14,New York Academy of Sciences,1,Niezgodski,1,NOAA,1,North Carolina,3,npca,1,NPDES,1,Ohio,2,Oklahoma,1,OSHA,1,PCTC,2,Pennsylvania,1,Pets,1,Physicians for Social Responsibility,4,Quigley,2,Quinoline,1,Reader's Digest,2,Regs,6,relative potency factor,1,Republican,1,Rice,1,Rocky River,1,Rodale,2,Rosenthal,3,RT-12,1,San Antonio,7,San Diego,1,Scalze,3,schools,8,Science,57,shotblasting,3,Sierra Club,1,Sisisky,2,Slavins,1,Smoking,2,South Barrington,1,South Carolina,1,Springfield,7,Stormwater Magazine,1,Suffolk,2,Suffolk County,3,Texas,4,The Doctors TV Show,1,Today Show,1,Tom Bashara,3,Toronto,2,tribute,1,TSCA,2,Twitter,9,UConn,2,University of Michigan,1,US Department of Health and Human Services,1,USA TODAY,3,USGS,43,Video,18,Wall Street Journal,1,Walmart,1,Warner,1,Washington,8,Washington Environmental Council,2,Washington State University,1,Watauga Riverkeepers,1,WEF,3,wetland regulations,1,Wieckowski,1,williams,2,Winfield,2,Wisconsin,3,z2014,31,z2014 Summary,14,
Coal Tar Free America: Coal Tar Sealant Runoff Remediation Study Underway
Coal Tar Sealant Runoff Remediation Study Underway
Coal Tar Free America
Loaded All Posts Not found any posts VIEW ALL Readmore Reply Cancel reply Delete By Home PAGES POSTS View All RECOMMENDED FOR YOU LABEL ARCHIVE SEARCH ALL POSTS Not found any post match with your request Back Home Sunday Monday Tuesday Wednesday Thursday Friday Saturday Sun Mon Tue Wed Thu Fri Sat January February March April May June July August September October November December Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec just now 1 minute ago $$1$$ minutes ago 1 hour ago $$1$$ hours ago Yesterday $$1$$ days ago $$1$$ weeks ago more than 5 weeks ago Followers Follow THIS CONTENT IS PREMIUM Please share to unlock Copy All Code Select All Code All codes were copied to your clipboard Can not copy the codes / texts, please press [CTRL]+[C] (or CMD+C with Mac) to copy