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DESCRIPTION:

Latitude 42°02'38",   Longitude 88°02'29"   NAD27
Cook County, Illinois   , Hydrologic Unit 07120004

Well depth: 0265 feet
Hole depth: 265 feet
Land surface altitude: 740 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	1970-04-29	1985-08-21	5
Field/Lab water-quality samples	1985-08-21	1985-08-21	1
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