aquifer systems / hydrologic systems / chemical constituents / /
NaturalFeature
Illinois River / Surficial Aquifers / Sea Level Datum / /
Organization
United States Environmental Protection Agency / U.S. Congress / Illinois Environmental Protection Agency / U.S. DEPARTMENT OF THE INTERIOR / /
Person
Daniel J. Sullivan / Barbara C. Scudder / Jana S. Stewart / S. Stewart Abstract / Peter M. Ruhl / Mitchell A. Harris / Faith A. Fitzpatrick / Dorothea W. Hanchar / Charles G. Groat / Terri L. Arnold / Robert M. Hirsch / /
Position
Chief Hydrologist / Chief U.S. Geological Survey / Director The use / Secretary U.S. GEOLOGICAL SURVEY / /