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DESCRIPTION:

Latitude 41°30'24",   Longitude 87°32'51"   NAD27
Cook County, Illinois   , Hydrologic Unit 07120003

Well depth: 350 feet
Hole depth: 350 feet
Land surface altitude: 630 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	1986-05	1986-05	1
Field/Lab water-quality samples	1987-04-21	1987-04-21	1
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