LOCATION.-- Lat 41°42'17", long 87°59'28" (NAD of 1927), Hydrologic Unit 07120004, at Argonne National Laboratory. Owner: Argonne National Laboratory. | |
AQUIFER.-- Niagara Dolomite of Middle Silurian Age. | |
WELL CHARACTERISTICS.-- Drilled unused artesian well, diameter 4.0 in., depth 140 ft, cased to 90.0 ft, open end. | |
PERIOD OF RECORD.-- | |
GROUND-WATER LEVELS: December 1948 to September 1997. | |
REVISED RECORDS.-- WDR IL-79-2: 1978. | |
INSTRUMENTATION.-- Electronic data logger--60 minute recording. | |
DATUM.-- Land surface datum is 733 ft above NGVD of 1929. Measuring point: Top of casing, 0.31 ft above land-surface datum. | |
REMARKS.-- Ground-water levels affected by pumping of nearby wells and regional drawdown cone. | |
EXTREMES FOR PERIOD OF RECORD.-- | |
GROUND-WATER LEVELS: Highest water level, 88.97 ft below land-surface datum, May 27, 1951; lowest, 106.19 ft. below land-surface datum, Feb. 25, 1990. | |