. The changing Illinois environment : critical trends : technical report of the Critical Trends Assessment Project. Man; Pollution; Environmental protection; Ecology; Environmental impact analysis. ACCIDENTAL RELEASES ACCIDENTAL RELEASES Accidental releases of chemical products and wastes have been recorded in an lEPA Incident Database since the early 1970's. Figure 1 shows the number of incidents rqxjrted between 1972 and 1992. Even though it appears that incidents are increasing at a rapid rate, the increase is largely due to changes in reporting requirements (Goodner, lEPA, Sept. 1992).. Fi
. The changing Illinois environment : critical trends : technical report of the Critical Trends Assessment Project. Man; Pollution; Environmental protection; Ecology; Environmental impact analysis. ACCIDENTAL RELEASES ACCIDENTAL RELEASES Accidental releases of chemical products and wastes have been recorded in an lEPA Incident Database since the early 1970's. Figure 1 shows the number of incidents rqxjrted between 1972 and 1992. Even though it appears that incidents are increasing at a rapid rate, the increase is largely due to changes in reporting requirements (Goodner, lEPA, Sept. 1992).. Figure 1. Number of reported incidents. The database identifies incidents by responsible party, location (county), material involved (different names are frequently used for the same material, see Table 1) and an estimate of amounts released. (Note: between 1972 and 1981, 50% of the reports did not include the estimated quantity released. Over the entire 20-year period, 50% did not include units of measurement; of those that do, the units reported are not always consistent. In more recent years, data has been reported more consistently, primarily because of changes in reporting requirements and improved database design.) Although limited, the available data can provide a general picture of which materials are being released most often (Table 1), which counties experience the most reported incidents (summarized in Figure 2), and where and when large incidents have occurred (Table 2). 2S00 ^ 2000 n - S. 1500 â¢B 1 1000 E r-| - - â ^ 500 Q mmnMMUKru i :^ ^ 7980 818283848586 87 888890 9192 1 Cook County D Collar Counties â Metro-East Counties Figure 2. Geographic areas reporting the most incidents. SUMMARY Fuels are the most commonly rqrarted materials involved in incidents. Anhydrous ammonia, poly- chlorinated biphenyls, sulfuric acid and chlorine are the other compounds most often reported. More than 2(X) reports listed the material spilled as being unknown and more than 100 fi
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