LOCATION.-- Lat 40°00'22", long 90°52'23" (NAD of 1927), in NW1/4SW1/4SW1/4 sec. 4, T.1 S., R.4 W., Hydrologic Unit 07130010, Well 1 (Illinois Environmental Protection Agency 50227), within Mound Station. Owner: Village of Mound Station.

AQUIFER.-- Limestone of Mississippian age.

WELL CHARACTERISTICS.-- Diameter 6 in., depth 483 ft, cased to 275 ft, open hole, drilled, public supply.

PERIOD OF RECORD.--

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