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.i~~ Ponds • • <br />,~ <br />,~ Shell, CIL and ~Ielland Chemical have ponds for the treatment or <br />f> storage of their wastes. The Shell settling pond for spent lime <br />slurries is no longer usea; CIL operates t~.o ponds Eor gypsum <br />~; slurry waste and Welland Chemical operates a liquid effluent <br />..~ storage end, as will as a lagoon waste treatment system which <br />~ discharges to the St. Clair River via the Scott Read Drain. <br />k Surface water and groundwater monitoring to identify pond <br />i seepage is done at CIL and W211and Chemical Limited. <br />Dr~n Storage <br />~ Welland Che•ical Limited operate a drummed storage facility. <br />,~ t~'aste Disposal Stmciarv <br />7 1. The types of waste disposal practices near the St. Clair <br />,~ River include landfarming, landfilling of . haurdous and <br />y non-hazardous waste,. pond storage, lagoon treatment, and <br />f drum storage. <br />Y <br />2. Monitoring of surface and groundwater sources varies <br />considerably. <br />_ 3. Soil p~emeability Ceneath the sites is low, therefore <br />migration of contaminants through the soil from surface and <br />near surface waste sources is slow. ' <br />~' SPILL SUP~tARY <br />a <br />During the years 1972 <br />the Sarnia area. In <br />product entered the St. <br />to 1984, there were 275 spills reported in <br />161 cases, or 58a of the spills, sa*,e <br />Clair River, or its tributaries. <br />Gonpanies with the highest Erec,.uency spills: <br />Polysar <br />Cow Chemical <br />Dnperial OillE550 <br />CNk <br />Sun Ji1 <br />48 spills <br />29 " <br />37 " <br />11 " <br />13 " <br />