LOCATION.-- Lat 42°09'47", long 87°56'18" (NAD of 1927), in NE1/4SE1/4NW1/4 sec. 34, T.43 N., R.11 E., Hydrologic Unit 07120006, Well 5 (Illinois Environmental Protection Agency 20297), about 1.5 mi northeast of Buffalo Grove. Owner: Pekara Subdivision.

AQUIFER.-- Dolomite of Devonian? and Silurian age.

WELL CHARACTERISTICS.-- Diameter unrecorded, depth 280 ft, cased to 128 ft, open hole, drilled, public supply.

PERIOD OF RECORD.--

GROUND-WATER QUALITY: February 1987 (see Voelker and others, 1987); April 2002.