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~•+ASTE DISPOSAL, SITES• • J i. h ~o~ ~~ There are eleven ~oaste disposal sites in Larwton County within 3 km of the St. Clair River. This includes 2 landfarming operations for refinery wastes, 7 landfills, 4 settling ponds, and 1 drum storage facility. A tabular s:srmary of the activities of theca facilities' is attached. The information provided below applies only to active sites. Those which may have been used historically but are now closed, are not included. An example is the Ladney property which is privately owned and has been covered and seeded. Landfarming Land farming or landspreading involves the application of petroleum wastes to the upper soil zcne where iesdecrn~sed by spoil bacteria. Shell and Esso annually dispose of 18,580 cubic meters of oily wastes and sludges by landfarming. Esso is the major landfarmer disposing of 17,900 cubic meters. Groundwater and surface water monitoring is 'mndurted at beth sites wich are located on clay or till with very iow permeability. Impact on these waters is negligible. Landfills (Disposal Sites) Lbw, Esso, Polysar, Fiberglass, Ontario Hydro, Unitec and Welland Chemicals Limited operate landfills for industrial waste. The province of Ontario is responsible for licensing these sites. Prior to remediation, leachate fran Pow's Scott Road site was migrating into the Scott Road Drain which enpties into the St. Clair via the Township Ditch. The site was subsequently benned for the collection Leachate, which is nocu treated using activated carbon prior to discharging to the Scro tt Road Drain. The Scott Road and Township Ditches were subsequently excavated to remove contaminated sediments which were placed in the Cow landfill. Lmperial Oil (Esso Petroleum and Esso Chem~cial) Fiberglass and Polysay also operate disposal sites along Scott Road. Further sampling of sediments, water, leachate and runoff is necessary to determine whether the disposal sites are a continuing cpurce of organics. Srne, preliminary sampling will be conducted as part of Environment Canada's intensive six week study. The waste types being landfilled vary considerably fran solvents with chlorinated hydrocarbons at Lbw's Scott Road site to coal and fly ash at Ontario Hydro's site. Monitoring of surface water, runoff and groundwater alp varies considerably. Dow has monitored at the Scott R;ad site since 1980 but Does not monitor at its LaSalle Road site. Polvsar and lvelland Chemicals Limited have mnitoring programs but Esso dces not. Ontario Hydro monitors only runoff pH fran the fly ash site. As part of the Upper Great Lakes Connecting Channels Study, these disposal sites will be assessed to deter-line the potential impact on ground rater and surface water. All landfills are located in clay or clay tills with low permeability.