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- ~} Faring the late 19~ an increased awareness of ~c organic cozpounds and the laboratory technolay for their i entification allowed the analysis of these effluents Eor trace organics (Ontario Ministry o£ the Enviroment 1975 and 1977, p~virormental Protection Service/Cntario ~~tinistry of the Envirorrcent 1979-1980). The results of these studies indicated that score effluents contained very high concentrations of '- industrial organic pollutants in excess of ene part per million (1 ppm). The industries found to to discharging organics in excess of 1 ppn ware asked to control the effluent irmediately, wzile those c„mpounds discharged in excess of 0.1 pExn war=_ to be subject to increases' monitorim . The present quality of thesa ~~ e`_flu~ents will be evaluated in detail during 1986 Linder ar. EPS - Crttario Region - Cntario Ministry of the Environment cco:erative s, survey of all point sources to the river. This survey will ~ identify sources requiring further mediation and fs part of ;: t.`:e Canada/U.S. Upcer Great Lakes Connecting Channels Stud_i. In t=_ans of direct discharges to tte St. Clair, the Sarnia , Township Ditch, which runs through Polysar pro~rty is considered as an "industrial point source because it contains industrial process effluent and ccolirg water and treated runoff or leachate Pram four industrial d~npsites owned by Imperial Oil, Fiberglass, lbw Ch=_mical and Folysar. Tt•,e Townsh?? Ditch nay ~ a major source of organics to the river due to the cresence of treated process water (POlysar, Ca~`~ot Carbon, Fiberglass) and treated leachate and/or runoff Pram tf:e industrial dumpsites (collectively known as the Scott Road dump). Cn ore occasion during 1985, stor,~rinduced runoff under high flow conditions was apparently responsible for large increases in concentrations of PC3s, hexachlorobenzene and octochlorostyrenes detected in the. Township Ditch, prix„arily in suspended solids and not in the acueous phase. An additional, ninon discharge is the dewatering effluent fran the Cv Railway tunnel which is contaminated with gases such as pi-:enolics, chlorides and hydrogen sulphide. See Append ix 1 for more information concerning Industrial Point C~urces. 'mint Sources - Munici The upper river fran Point Edward to Corunna also receives the i discharge fran G`lree municipal water pollution control plants e (tvBCPs) - Point Edward, Sarnia and Corunna - which have a ~. cxnbined capacity of 73 million litres per day. T:`.e Point ~ Edward and Sarnia 4rrCPs provide primary treat:;~ent with - phosphorus removal, The Corunna Plant is an extended aeration facility with phosphorus ranoval, In addition to the t4FCPs, urban runoff (store sewers) and canbined storm sanitary waste (ccrtibined se•.uer overfl_~s) also discharge to the river. Sarnia is the r,2jor urban c=_ntre and has 4 wet weather cawined mower overElo«s and 11 stern water cutfalls. 'r..n of the combined sewer overflows and three of the storm se•..ers service the "Chemical Vall=~~" and are cotential sources of industrial organics. ..