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DESCRIPTION:

Latitude 41°28'53",   Longitude 87°37'34"   NAD27
Cook County, Illinois   , Hydrologic Unit 07120003

Well depth: 493 feet
Land surface altitude: 690 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	1967-01	1967-01	1
Field/Lab water-quality samples	1985-11-15	1987-11-03	6
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