LOCATION.-- Lat 42°04'53", long 89°17'26" (NAD of 1927), Hydrologic Unit 07090005, approximately 4 mi southwest of Byron. Owner: U.S. Environmental Protection Agency.

AQUIFER.-- St. Peter Sandstone of Ordovician age.

WELL CHARACTERISTICS.-- Drilled unused artesian well, diameter 2 in., depth 230 ft, cased to 225 ft, screened.

PERIOD OF RECORD.--

GROUND-WATER LEVELS: February 1992 to September 1997 (fragmentary). Miscelleaneous water-level measurements from March 1989 to February 1992 are available in files of the U.S. Geological Survey.

INSTRUMENTATION.-- Manual steel-tape measurement made every 2 months.

DATUM.-- Land-surface datum is 860.4 ft above NGVD of 1929. Measuring point: Top of 2 in. casing, 1.1 ft. above land-surface datum.

EXTREMES FOR PERIOD OF RECORD.--

GROUND-WATER LEVELS: Highest water level measured, 170.33 ft below land-surface datum, Aug. 9, 1993; lowest measured, 175.01 ft below land-surface datum, Aug. 4, 1992.