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1~ II li I II I t :r:: .: Clean till, from page 58 such. Though some of dress compounds post little health tltrcat, their presence might indicate the possibility of other harmful compounds. PAHs (some of which are known carcinogens) arc found in combustion products and specifically found in coal tar (a known pollutant). And so the azphalt industry must deal with a strange logic. "Certainly the government suspected that they (PAHs) might be in there (the leachate) in fairly high conccnuations because tar has them. Asphah and tar arc bndt black and both sticky, so there you arc," says Tony Kriech, director of research for Heritage Research of Indianapolis, Indiana, at the Missouri Asphalt Pavement Association March meeting in Jefferson City. The government's concern is that something in the asphalt or aomelhing spilled on the pavement i< < contaminating the environment. "The cleanest, most efficient plants in the world" Hot mix asphalt plants using our patented, award winning Heat Recovery Cold Feed Bias rue the cleanest, most efficient plants in the world. Heat Recovery provides: • 3056 to 40561es5 fuel • 5056 less exhaust volume • patpctilate motto adsarptioa ,~, .. • gttseau emission absorption '' • odor aductions • blue smoke condensing r~ You can also benefit from our proven expertise. Heat., Raovery bins substantially:'. reduce thermal requirements in your dryer and reduce au pollution. It's a proven fact! To increase your profiu end reduce your environmental problems contact Mix Design Methods today! C. g 047 t-800-FOADMIX • 215-757-3350 • FA% 215-757-9665 MlX DESIGN ~ METHODS In I Suile 607, One oxford Valley i P.O. [iox 88 Lan hornc, PA 19 Similarly, the State of Illinor> Fars that at the end of its useful life, AC pavement cannot be taken up and uscd elsewhere as clean fill. The contention is pulverized Portland cement concrete (PCC) can be used for clean fill but AC pavement cannot because of its potential to contaminate. Their - disbelief in this reasoning prompted IAPA to sponsor laboratory testing to scientifically examine this theory. The staff of the laboratory used brand new samples. They uscd old samples from the anteYOf the toad, the wheel path, the lane and from the shoulder. They used samples from six random locations around !llirtois. They tumbled, blurted in flames, distilled, and atornially absorbed these samples. The technicians used Sloo,ooa- 5250,000 instruments with exotic names: mats spearographs, gas cluomatographs and zero-headspace TC1P. They tested with machines so advanced that their technology haz just been available iu the last eight to teo years They achieved such eocurate separation that their answers came in parts per billion Steely these qualify as the numbea which the doubters needed. It is fortunate that these tlxhniaans have instrumwts for analysis that are capable of measuring ouch minute '- amounts. If they had not, they would ,:• have Ieea not, for wbat they are fmlfing . is so small, drinking water stantJards allow mttrJt highs contea4 In the wheel paths they ate finding trace • ;levels of naptbaleae and ;_, phweathtrao--chemicals found in . tins -... Sitter the tray levels rue um to to the whorl paths, it appears that th~y are deposited by dyes and spillage. With this in mind, the laboratory tests samples of PCC from wheel paths of adjoining pavemcnts.'llte PCC samples reveal the same trace levels as the asphah. In fact, these tests arc finding the PCC and the AC pavcmcm w fx basically eyuivalem for leachability. So now the numbers arc in. Wc'vr proved whorl we ahcady Anew. .Siurr Iles pnxd i~ ha+ed on ~t:ur-ul-tl rc-:u 1. ~ricmilic :w:dy.it in.lr;ul ul br.I rn it nh.cr v.tln ni. hutxlully ur r.m ryrc,~~ .~ Ir.i.i „f Irv. ,d ihr d~mMri. n. yon rl,whiinr 1 YA+Ie m Sa01o, mo+c uduna:+l+tm