LOCATION.-- Lat 41°49'39", long 88°11'48",in NE1/4NE1/4NW1/4 sec. 34, T.39 N., R.9 E., Hydrologic Unit 07120004, Well 4 (Illinois Environmental Protection Agency 20766, within Warrenville. Owner: City of Warrenville.

AQUIFER.-- Dolomite of Silurian age.

WELL CHARACTERISTICS.-- Diameter unrecorded, depth 365 ft, casing depth unrecorded, open hole, drilled, public supply.

PERIOD OF RECORD.--

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