LOCATION.-- Lat 41°54'10", long 88°03'43" (NAD of 1927), in NW1/4NW1/4NE1/4 sec. 2, T.39 N., R.10 E., Hydrologic Unit 07120004, Well 1 (Illinois Environmental Protection Agency 20700), about 1 mi north of Glen Ellyn. Owner: Glen Ellyn Heights Subdivision.

AQUIFER.-- Maquoketa Group? of Ordovician age.

WELL CHARACTERISTICS.-- Diameter 8 to 10 in., depth 350 ft, cased to 234 ft, open hole, drilled, public supply,

PERIOD OF RECORD.--

GROUND-WATER QUALITY: July 1985 (see Voelker and others, 1987); January 2002.