LOCATION.-- Lat 41°41'40", long 88°27'46" (NAD of 1983), in NE1/4SW1/4 sec.8, T.37 N., R.7 E., Hydrologic Unit 07120007, near Yorkville. Owner: U. S. Environmental Protection Agency.

AQUIFER.--Glacial drift of Quaternary age.

WELL CHARACTERISTICS.-- Diameter 2.0 inches, depth 32 feet, cased to 27 feet, screened, drilled, observation.

PERIOD OF RECORD.--

GROUND-WATER LEVELS: August 2005.

INSTRUMENTATION.--Manual steel-tape measurements.

DATUM.--Measuring-point datum is 642 ft above NGVD of 1929 (642 ft NAVD 1988). Measuring point: Top of inner well casing.