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DESCRIPTION:

Latitude 41°30'43",   Longitude 87°39'12"   NAD27
Cook County, Illinois   , Hydrologic Unit 07120003

Well depth: 406 feet
Hole depth: 406 feet
Land surface altitude: 665.00 feet above NGVD29.
Well completed in "Silurian-Devonian aquifers" (N400SLRDVN) national aquifer.
Well completed in "Silurian System" (350SLRN) local aquifer

AVAILABLE DATA:

Data Type	Begin Date	End Date	Count
Field groundwater-level measurements	1962-12-17	1985-03-20	10
Field/Lab water-quality samples	1984-06-12	1985-03-20	4
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