. The changing Illinois environment : critical trends : technical report of the Critical Trends Assessment Project. Man; Pollution; Environmental protection; Ecology; Environmental impact analysis. UNDERGROUND INJECTION WELLS Elevation (ft) -4000 0 -2000 I -6000 ru LaSalle ecarnbrian Cambrian Decatur Centralia Pennsylvanian' Ordovician Silurian-Devonian Mississippian. 0 -2000 I -6000 -4000 Elevation (ft) â iiuiliiililii^ Boundary between USOW and aquifers with groundwater containing > 10,000 mg/L TDS Area in which there is some risk for moderate to severe damage from seismic events Area in
. The changing Illinois environment : critical trends : technical report of the Critical Trends Assessment Project. Man; Pollution; Environmental protection; Ecology; Environmental impact analysis. UNDERGROUND INJECTION WELLS Elevation (ft) -4000 0 -2000 I -6000 ru LaSalle ecarnbrian Cambrian Decatur Centralia Pennsylvanian' Ordovician Silurian-Devonian Mississippian. 0 -2000 I -6000 -4000 Elevation (ft) â iiuiliiililii^ Boundary between USOW and aquifers with groundwater containing > 10,000 mg/L TDS Area in which there is some risk for moderate to severe damage from seismic events Area in which designated geologic unit contains potential disposal zone(s); all more deeply buried units may also conlain potential disposal zones I Pennsylvanian II Chesterlan III Silurian-Devonian IV Cambrian V Elmhursl-Mt. Simon VI Disposal not feasible Basal Sandstone lacks confining bed Figure Uppermost geologic units that have contained disposal zones and the sut>surface relationships of these units. 187. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Illinois. Dept. of Energy and Natural Resources; Critical Trends Assessment Project. Springfield, Ill. : Ill. Dept. of Energy and Natural Resources
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