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The stud�T revealed that the asphalt-based sealcoat runoff <br />contained 10 times more PAH than the uncoated parking <br />lot and the coal-tar sealcoat runoff had concentrations of <br />PAH that were 65 times higher than the uncoated lot. <br />Maintenance expenses <br />Besides the health effects and the danger to the <br />environment, PAHs are making routine maintenance of <br />storniwater ponds by cities and townships many,, man-y <br />times more expensive because sediment With high- <br />enough concentrations of PAHs must be disposed of <br />differently. <br />In Minnesotal, when some cities removed sediment from <br />their stormwater ponds as pail of regular maintenance,, <br />they found elevated levels of PAHs. This discovery <br />required them to find special disposal areas, costing <br />them mane thou sands of dollars more. <br />Current regulation <br />Because of the environmental problems associated with <br />I <br />PAHs, the Cite of Austin, Texas', Dane County, <br />Wisconsin, and Washington D.C. have banned use of <br />coal tar-based sealcoat in their Jurisdictions (asphalt- <br />based sealcoat may still be used). <br />Recent legislation passed in Minnesota bans the <br />purchase of coal-tar sealcoat products by state agencies <br />by July 11, 2010. Recentiv, two national home- <br />Coal-tar-based Driveway Sealcoat * wq-strm4-12 • September 2009 <br />improvement retailers, Loves and Home Depot., took <br />coal tar-based sealcoat off their shelves. Check with your <br />local unit of government to see if there are am <br />restrictions. <br />Make the right choice <br />The best choice may be to not sealcoat your driveway at <br />all. But if N,-ou do choose to sealcoat', study labels <br />carefully to be sure to find an asphalt-based product. <br />Lower concentrations of PAHs in waterwaN TS Will <br />prevent costly maintenance for your city and keep <br />w,atei­xN,-ays safe for fish and other aquatic organisms. <br />If you have leftover material after sealing your <br />driveway,, you can re-use or recycle it at -our <br />community s household hazardous waste facility. To <br />find your local ficicilitV, <br />VjSjt* X\� -1-,\7 Taste 111 w,pca,.st atemn.us/ N hh <br />References <br />Van Metre, P.C., ]abler ', BJ.1, Scoggins, M., and <br />Hamilton', P.A.,, 2006. Parking Lot Sealcoat- A <br />M * Y or Source of Pol- 7 cyclic Aromatic Hydrocarbons <br />qJ .1 <br />(PAHs) in Urban and Suburban Environments. A <br />USGS report prepared in cooperation with the Citv <br />of Austin, Texas. <br />Minnesota Pollution <br />.. . .. . .. .. C�.wWol Al",ncy <br />