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For more information contact: Illinois State Geological Survey 615 East Peabody Drive Champaign, Illinois 61820-6964 (217) 244-2414 http://www.isgs.uiuc.edu Released by the authority of the State of Illinois: 2007 Illinois Department of Natural Resources ILLINOIS STATE GEOLOGICAL SURVEY William W. Shilts, Chief Illinois County Geologic Map ICGM Kane-QA 2 / ° 1 2 APPROXIMATE MEAN DECLINATION, 2007 MAGNETIC N OR TH TRUE NORTH ADJACENT COUNTIES 1 McHenry 2 Lake 3 Cook 4 DuPage 5 Will 6 Kendall 7 DeKalb 7 1 2 3 4 5 6 1 10 KILOMETERS 0 1 2 4 3 5 6 7 8 9 SCALE 1:100,000 1 8 MILES 1 0 2 3 4 5 6 7 Ashomore Tongue, Henry Fm Tiskilwa Fm Batestown M, Lemont Fm Yorkville M, Lemont Fm Haeger M, Lemont Fm Henry Fm Henry Fm Beverly Tongue, Henry Fm Henry Fm bedrock Glasford Fm (sand and gravel) Glasford Fm (diamicton) Carpentersville aquifer Figure 3 Schematic diagram of the Carpentersville aquifer. Ashmore Tongue, Henry Fm Tiskilwa Fm Batestown M, Lemont Fm Yorkville M, Lemont Fm Henry Fm Henry Fm Henry Fm bedrock Glasford Fm (diamicton) Glasford Fm (diamicton) Glasford Fm (sand) St. Charles aquifer or Virgil aquifer or Gilberts aquifer Unnamed aquifers Figure 1 Schematic diagram of the St. Charles, Virgil, Gilbert and unnamed aquifers. The St Charles, Hampshire, Virgil, and Gilberts aquifers share most of the same hydrostratigraphic units, but there is enough geographic separation between them to consider them separate aquifers. Ashmore Tongue, Henry Fm Tiskilwa Fm Henry Fm bedrock Hampshire aquifer Glasford Fm (diamicton) Glasford Fm (diamicton) Glasford Fm (sand) Figure 2 Schematic diagram of the Hampshire aquifer. Major Quaternary Aquifers Introduction Elements of the three-dimensional model were used to produce Major Quaternary Aquifers of Kane County, Illinois (Dey et al. 2007e), replacing the Interim Major Quaternary Aquifers of Kane County, Illinois (Dey et al. 2005b). On the new map, four aquifers are renamed to coincide with lo- cal geographic features. The definition of one renamed aquifer is adjusted to include additional lithostratigraphic units based on the current geologic model. In Illinois, major aquifers are defined as geologic units (sand and gravel or fractured and/or permeable bedrock) capable of yielding at least 70 gallons of water per minute (gpm) to wells completed in them (Miller et al. 1985). Quaternary aquifers in Kane County are saturated thick sand and gravel deposits. Sand and gravel deposits are considered aquifer materi- als, because their porosity and hydraulic conductivity is high and allow for the free flow of water. Aquifer materials are aquifers when they are satu- rated. We have mapped the distribution of Quaternary aquifer materials in the county and have used results from potentiometric surface mapping by the ISWS to determine where the aquifer materials are or may be satu- rated (Locke and Meyer 2007). Our map depicts the location of deposits of Quaternary aquifer materials that have the potential to meet the definition of major aquifer. The mapped units are greater than 50 feet thick at some points within their distribution and are several square miles in areal extent. Boundaries are shown where the aquifer thickness is 20 feet or greater. The thickness is an aggregate thickness of sand and gravel deposits within the mapped unit and not necessarily the thickness of any one lith- ostratigraphic unit. Any properly constructed well that is sited where one of the mapped combinations of aquifers materials have a saturated thickness of greater than 20 feet should have a high probability of producing greater than 70 gpm of water, assuming minimal influence from other pumping wells or aquifer boundaries. Mapped Aquifers Following the descriptions of Curry and Seaber (1990), Vaiden and Curry (1990) mapped four Quaternary aquifers that had the potential for de- velopment as public water supplies in Kane County. Working from these definitions and employing results from the current mapping effort, we have identified five major, named Quaternary aquifers and a group of unnamed major Quaternary aquifers. 1. The St. Charles aquifer, named for the St. Charles Bedrock Valley, is located in the valley and its tributaries in eastern and southern Kane County. The St. Charles aquifer is composed of the Ashmore Tongue of the Henry Formation and sand and gravel deposits of the Glasford Forma- tion (fig. 1). These units are in hydraulic contact in a large portion of the mapped area of the aquifer. In the northern half of the county, away from the Fox River, the aquifer is commonly more than 50 feet below the land surface. In the Fox River valley, the aquifer is commonly less than 20 feet below the land surface. The aquifer has some hydraulic connection to the Fox River in the vicinity of St. Charles. 2. The Hampshire aquifer, named for the village of Hampshire, is located west of the Marengo Moraine in northwestern Kane County. The Hamp- shire aquifer is composed of the Ashmore Tongue of the Henry Forma- tion and sand and gravel deposits of the Glasford Formation. Surficial sand and gravel of the Henry Formation are included in areas where the Tiskilwa Formation is absent north and west of Hampshire (fig 2). These coarse-textured units are all in hydraulic contact northwest of Hampshire where the aquifer is unconfined. Where the Tiskilwa Formation is present (south and east of Hampshire), the aquifer is probably under confined con- ditions. The Ashmore Tongue and Glasford sand and gravel deposits are in hydraulic contact in the area around Burlington. 3. The Virgil aquifer, named for the town of Virgil, is located in west- central Kane County. It is composed of the Ashmore Tongue of the Henry Formation and sand and gravel deposits of the Glasford Formation (fig. 1). These coarse-textured units are in hydraulic contact near the center and eastern portion of the aquifer. The aquifer is overlain by greater than 20 feet of Tiskilwa Formation and is 50 to 200 feet below the land surface. 4. The Gilberts aquifer, named for the town of Gilberts, is located in north-central Kane County. It is composed of the Ashmore Tongue of the Henry Formation and sand and gravel deposits of the Glasford Forma- >100 Major Aquifers (thickness in feet) >100 50–100 20–50 >100 50–100 20–50 >100 50–100 20–50 >100 50–100 20–50 50–100 20–50 50–100 20–50 St. Charles Hampshire Virgil Carpentersville Unnamed Gilberts 750 25 20 88 Interstate highways U.S. and state routes Other roads Railroads Municipal boundaries Rivers and lakes Bedrock surface elevation Contour interval 50 feet (above mean sea level) R i v e r Fox 700 700 750 800 800 750 750 700 700 700 650 650 600 700 650 700 650 700 750 700 700 700 750 750 750 750 700 700 650 600 650 600 750 700 750 700 700 700 700 700 550 500 650 600 650 600 550 550 600 600 650 650 600 650 700 650 600 550 650 550 600 650 650 650 700 600 550 550 650 600 650 600 600 600 600 650 600 700 600 650 700 650 650 600 700 700 600 650 500 650 650 650 90 88 90 88 20 20 30 47 31 38 56 47 47 72 72 72 62 68 31 31 31 64 64 64 25 25 38 25 Big Rock Sugar Grove Montgomery Batavia North Aurora Aurora Virgil Elburn West Dundee Sleepy Hollow East Dundee Elgin South Elgin St. Charles Maple Park Barrington Hills Carpentersville Lily Lake Algonquin Huntley Gilberts Pingree Grove Hampshire Burlington Geneva ST . CHARL E S B E D R O C K V A LL E Y ELGI N B E D R O C K V A L L E Y E L B U R N B E D R O C K V A L L E Y T. 38 N. T. 39 N. T. 39 N. T. 40 N. T. 40 N. T. 41 N. T. 41 N. T. 42 N. R. 7 E. R. 8 E. R. 8 E. R. 7 E. R. 7 E. R. 6 E. 41° 43' 28" 88° 15' 41" 88° 36' 7" 42° 9' 15" R. 7 E. R. 6 E. T. 41 N. T. 42 N. T. 40 N. T. 41 N. T. 39 N. T. 40 N. T. 38 N. T. 39 N. 88° 14' 19" MAJOR QUATERNARY AQUIFERS KANE COUNTY, ILLINOIS William S. Dey, Alec M. Davis, and B. Brandon Curry 2007 tion (fig 1. The Gilberts aquifer is overlain by 50 to greater than 100 feet of Tiskilwa Formation and is 125 to 250 feet below the land surface. 5. The Carpentersville aquifer, named for the town of Carpentersville, is located in northeastern Kane County. The Carpentersville aquifer is composed of the surficial sand and gravel deposits of the Henry Forma- tion, the Beverly Tongue of the Henry Formation, the sub-Batestown and sub-Yorkville tongues of the Henry Formation, the Ashmore Tongue of the Henry Formation, and sands and gravels deposits of the Glasford Forma- tion (fig. 3). All of these coarse-textured units have some hydraulic con- nection in the mapped extent of the aquifer in Kane County or to the east in Cook County. The upper sand and gravel units in the aquifer may not be fully saturated; therefore, the mapped thickness may be overestimated 6. The unnamed aquifers are composed of surficial sand and gravel of the Henry Formation and/or the sub-Batestown and sub-Yorkville tongues of the Henry Formation (fig. 1). These units lack the continuity of a single aquifer, but locally may meet the definition of major aquifer. Water level data in the units constituting these aquifers is sparse, making generalized assessment of their saturated thickness difficult to assess. Application The Major Quaternary Map (Dey et al. 2007) shows areas where there is a high probability of obtaining greater than 70 gpm from a properly construct- ed well finished in one of the mapped aquifers. Areas where the aquifers are close to or greater than 100 feet thick are recommended as locations to begin searching for sites for shallow high-capacity wells. The Major Quaternary Aquifers, Kane County, Illinois (Dey et al. 2007) is intended to be used for county-scale planning and as guide to exploration for develop- ing shallow groundwater resources. This map should not be used as a substitute for site-specific work. The map is available at http://www.isgs. uiuc.edu/maps-data-pub/icgm/pdf-files/kane_co_qa_icgm.pdf . References Curry, B.B., and P.R. Seaber, 1990, Hydrogeology of Shallow Groundwater Resources, Kane County, Illinois: Illinois State Geological Survey, Con- tract/Grant Report 1990B1, 37 p. Dey, W.S., A.M. Davis, and B.B. Curry, 2007a, Major Quaternary Aquifers, Kane County, Illinois: Illinois County Geologic Map, ICGM Kane-QA, 1:100,000 Dey, W.S., A.M. Davis, B.B. Curry, J.C. Sieving and C.C. Abert, 2005b, Interim Map of Major Quaternary Aquifers, Kane County, Illinois: Illinois State Geological Survey, Illinois Preliminary Geologic Map, IPGM Kane- QA, 1:100,000. Locke, R.A.II, and S.C. Meyer, 2007, Kane County Water Resources Investi- gations: Final Report on Shallow Aquifer Potentiometric Surface Mapping. Illinois State Water Survey, Contract Report 2007-?? 04, ?? p. Miller, J.R., R.C. Berg, T.M. Johnson, and H.A. Wehrmann, 1985, Siting a low-level radioactive waste disposal facility in Illinois; Statewide criteria description of maps compilation data base and intended use: Illinois State Geological Survey, Report to Illinois Department of Nuclear Safety, 27 p. Vaiden, R.C. and B.B. Curry, 1990, Aquifers with the potential for develop- ment of public water supplies: Prairie Aquigroup, Kane County, Illinois: Illinois State Geological Survey Open File Series, OFS 1990-2a 1:62,500
