LOCATION.-- Lat 41°43'05", long 89°55'09" (NAD of 1927), in SW1/4NW1/4SW1/4 sec. 15, T.20 N., R.5 E., Hydrologic Unit 07090005, Well 1 (Illinois Environmental Protection Agency 11904), within Lyndon. Owner: Village of Lyndon.

AQUIFER.-- Galena and Platteville Groups of Ordovician age.

WELL CHARACTERISTICS.-- Diameter unrecorded, depth 820 ft, cased to 564 ft, open hole, drilled, public supply.

PERIOD OF RECORD.--

GROUND-WATER QUALITY: July 1986 (see Voelker and others, 1987); March 2002.