The following text may have been generated by Optical Character Recognition, with varying degrees of accuracy. Reader beware!

14 - The Canadian ChampionTuesday, September 2, 1997 131RIRPNY'S S 'VI-14 I AND SWJM BOIMQUE 1 78-9747 230 Drout, St. S. Miton Doctor says chiorine risks negligible t ram Chlorîne on page 8 for cleaning water bus do not carry residusl liip t lh 1i ttut In addition ozone is unstabie ii that it combines easily witb otîser chemicals. Ozone is also mucb mure expensive. Chlorine is delivered in large gas canisters wbicb are simply attacbed to a regulator. "Ozone is only applicable for problema at the source," said Dr. Nosal. "In Milton we don't bave a source quality problem. Chlorine, bromine and iodine are the only real options." Tony Smith, Haltun's acting director of envirunmental services, admitted that eblo- ie presents a problem for peuple. Dr. Nosal explained that bigh dose expu- sure tu those wurking witb it can be fatal. However, it is natural in low doses, be said, explaining that the body needs small hc I aîL in hîghcer onccnn iationis. "The real problem is when chlorine com- bines with naturally occurring organie mat- ter wbich is fuund in surface water," Dr. Nosal said. 'That can form certain chemicals (THM) known to be cancer causing. The allowable levels of these THMs used tu be 350 parts per billion but that bas been lowered to 100 parts per billion." The doctor said in Milton and Georgetown THM levels are around 10 parts per billion. In the suutb of Halton they are about 25 parts per billion. Dr. Nusal said risk assessments suggest Mohawk Raceway. Guelph Lin e, North of the 401, Campbe1lville. AN EllVIcl14NN OUT c mte t : \Torono GulhUCampblville Mlo 1401 312 4- London Burlzngton M OHAWK $4 AomSSîssON. PARKING is ALWAYs FREE. INFO? CALL ToLL FREE 1-888-675-RACE www. oj.c .com *First 3000 fans witb paid admission receive a coupon for a frec poster redeemable inside the main gates. Offer only vatid at Mohawk Raceway f'or live barness racing on Saturday, September 13th, 1997. 1ÀÀ BIs Mate Baer t 4ý IUAI Save 50 $49 Idoz. Save 40, u6ManE -naiMitn. "' 7 i-13 WO>uLDN'T YOU RArHIER BE ATr A HORSE RACE? ~Ytandardbred racing is back at Mohawk September 8th. On Seprember 13th, Cam Fella and four of his sons help us celebrate its return. The festivities commence at 6 pm when our guests hill be receiving visitors. Be among the first 3000 fans through the gate andi you'l take home a free poster of Cam Fella. * Have your fàvourite driver sign an autograph. Buy a raffle ticket and you coulti win an original Cam Fella print by Anthony M. Alonso. Profits from Cam's tour benefit the jennifer Ashleigh Foundation, Crohn's and Colitis of Canada andi the Harnesa Horse Youth Foundation. Maie or femnale, everybody's welcome to Join the guys at Mohawk. that the likelihood of someone getting can- cer in Halton from the THMs "is fair lower il ' )in no t' million, or essentiallHe explained that the cancer froiri THMs would be in addition Io those cancers which would already occur in a signilicant portion of the population. He said the risk associated with not chlo- rinating the water is much higher and Halton Region must operate on the princi- pie of "prudent avoidance." The doctor said he authored a report in 1993 that sugglested chlorination of Multon's water. He said Milton has had problems with contamination in the 1990s including birds, nitrates and several breaks in the pipes. "Without it peuple will get sick in a month, three months or three years. It will happen," he said. "So far we've been lucky." Dr. Nosal added that chlorination was necessary before provincial standards on water quality became tougher. 'hie higher standards "Just clinched it." Waste water treatments e ramn HOW on page 8 town grew the sturmi runoîf was redirected into area creeks. The capacity being used tu treat what was essentially dlean water wa s better put to sewage, rather than building expensive plant expansions. When the sewage furat cornes intu the plant it is 99 per cent liquid. Mr. Amold said he bas removed a shovel and a tobog- gan from the effluent at this stage. He said such objecta must have been mntroduced to the system through sanitary sewers. tn addition he has found frogs, toads and snakes in the system. oThe stuff passes through a number of stages designed to remove solids. First, inurganic material such as cloth and small tuys are skimmed, then the effluent is pumped intu tanks which allow particles to settle. The resulting thick sludge is trucked to J3urlington tu be processed at the Skyway Wastewater Treatment Plant. Mr. Arnold said the une or twu truck luada per day which make the trek from Milton are hardly noticed in their large system. The remaining material ia put intu an anaerobic digester, where bacteria and oxygen break down the stuff into its basic chemnical componients. jThe process is natural, according tu Mr. Amuld, and would occur anyway but by Sagitating the liquid it is made to occur much mure quickly. Aluminum sulfate is added to break down phosphorus and nitrates. The chemi- cal also helps particles bond and sink in holding tanks. Eventually, the fluid is flI- *tered down througb a mixture of charcoal and sand. The resulting water is rclatively dlean, with about tive parts per million of sulids remaining, down frum about 10,000 parts per million wben the sewage first entered the plant. The water is given a final mix with cblo- rine gas, wbich is then removed before the water is released into 16 Mile Creek. Plant supervisor George Prior said he bas seen fingerlings swimming up the creek tbrough the water streaming from the plant. He said salmon, whicb are extremely sensitive tu chlorine, will make the mun in about a month. If any chlorine is getting intu the stream from the plant the salmon will be the tii-st tu know, he said. Filters from the Burlington company Zenon have reduced emission of solida in the treated water to nil in sonne tests, Mr. IPrior said.