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DESCRIPTION:

Latitude 41°48'33",   Longitude 87°53'54"   NAD27
Cook County, Illinois   , Hydrologic Unit 07120004

Well depth: 385 feet
Hole depth: 385 feet
Land surface altitude: 670 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	1924-10-01	1985-08-16	9
Field/Lab water-quality samples	1914-03-08	1985-08-16	2
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