Geologic Mapping in Northeastern Illinois & What Do We Know About Lake County’ S Geology?

Geologic Mapping in Northeastern Illinois & What do we know about Lake County’ s Geology?

Donald A. Keefer, Director Geologic Mapping and Hydrogeology Center Societal Benefits of Mapping

• Water Suppl y Delineation, Protection and Mana gement • Aggregate Resource Delineation, Protection and Management • Construction Engineering Guidance • Mineral Resource Delineation, Planning and Management • Development of Energy Infrastructure • Habitat and Wildlife Protection

Mapping has an excellent cost to benefit ratio ISGS Geologic Mapping in Nort heastern Illino is • Central Great Lakes Geologic Mapping Coalition (a.k.a. “The Clii”)hihCoalition”): high reso li3lution 3-DihhLkCD mapping throughout Lake County; Federal and State funding • STATEMAP Program: Lake, Cook, Kane, McHenry Counties; high resoltilution mapp ing o f sur fiilficial ma ter ilials; FdFedera l an dSttd State fun ding • Northeastern Illinois Water Supply Planning Region: regional geologic mapping for Fox River Basin sand and gravel aquifers and surficial bedrock aquifer, regional characterization of deep bedrock aquifer and confining unit; State funding • Kane County: high to medium resolution 3-D mapping; County and State funding • Kendall County: medium resolution 3-D mapping; County and State funding Costs Vary with Geology

• Costs are dependent on geologic complexity • Northeastern Illinois collar counties demonstrate range of issues • Sub sur face compl ex ity oft en diffi cu lt t o estimate without new data

Water Supply Planning Regions Water Supply Planning and Management State Geological Survey role: • MiMapping an dhtiid characterizing – Deep Bedrock Aquifer – Confining units of Deep Bedrock Aquifer – Glacial aquifers and surficial bedrock aquifer, particularly within Fox River Basin – Glacial aquifers within and above Mahomet bedrock valley (Mahomet aquifer system) • Create and improve 3-D geologic maps and work with SWS colleagues to help integrate these into groundwater flow models Water Supply Planning and Management • Exploring new methods for bedrock aquifer characterization • Characterizing confining units • Evolving 3-D geologic mapping approach titto integrat e exi itisting maps of fl glaci ilal deposits for large Fox River Watershed

Outwash sand & gravel units Geologic Mapping In Kendall County Geology of Lake County

I j* K J f* I h* I h* I h* I a* (g*)K f* I H I J h* I a* F (h*)(i*) (f*)I H Ie* i* z* I e* i* z* I j* K J K I f* I f* I a* H II K I e* I h* J g* I I e* I (e*)g* I a* (g*)K e* I K a* (g * )K H I HIH I wat er a* H I K H I H I wat er j* K (I) (e*)(f*)I wate r K (e*)h* I j* K (I) X wate r (e*)(f*)I a* K e* I (h *)I j* K (I ) K (e*)h* I K I e* I H I (f*)I k* J J h* I h* I h* I a* K e* I (h *)I f* I I e* I I K I e* I e* I H I e* I f* I e* I h* I h* I h* I (J) K I H I X f* I e* I E I a* (h*)I e* I a* K (I) h* I I (h*)I a* K e* I a* I e* I I z* I h* I (J)K(J) K e*I* I a* I (J) K e* f* H What is (a *)H I the (f*)I value of high resolution (e*)(f*)I e* I H H (a*)(f*)I geologic mapping? H I

h* I

f* I

K I

a* K

I (J) K

1 mile FOX LAKE ANTIOCH WADSWORTH ZION

Legend Lithostratigraphic units Cahokia Formation (alluvium) WAUCONDA GRAYSLAKE LIBERTYVILLE WAUKEGAN Disturbed Ground Equality Formation (lake sediment Grayslake Peat (organic) Henry Formation (outwash) Wadsworth Member (diamicton) Haeger Member (diamicton) Water

BARRINGTON LAKE ZURICH WHEELING HIGHLAND PARK FOX LAKE ANTIOCH WADSWORTH ZION

BARRINGTON LAKE ZURICH WHEELING HIGHLAND PARK 3D Geologic Mapping in Lake County, IL 3D Geologic Mapping in Lake County, IL

FOX LAKE ANTIOCH WADSWORTH ZION

Legend 2 Lithostratigraphic units Cahokia Formation (alluvium) WAUCONDA GRAYSLAKE LIBERTYVILLE WAUKEGAN Disturbed Ground Equality Formation (lake sediment Grayslake Peat (organic) Henry Formation (outwash) Wadsworth Member (diamicton) Haeger Member (diamicton) Water

BARRINGTON LAKE ZURICH WHEELING HIGHLAND PARK

Aquifers of Northeastern Illinois West East

DeKalb Chicago

Unconsolidated Aquifer System Shallow Bedrock Aquifer Deep Bedrock Aquifer System

Cross-Section Modified from Bretz (1939) Elmhurst-Mt. Simon Aquifer Sand and gravel pit on the Fox River

Fractured Dolomite

<2,500 mg/L TDS

2,500-10,000 mg/L TDS

>10,000 mg/L TDS Geologic Mapping in Northeastern Illinois & What do we know about Lake County’ s Geology?

Donald A. Keefer, Director Geologic Mapping and Hydrogeology Center