WELLS OP DUPAGE COUNTY, ILLINOIS. 593 



second deep well in use. The drift in the j vicinity of Hinsdale is about 

 100 feet in depth and is mainly till. On the moraine west and northwest 

 from this village several wells show the drift to be over 150 feet in thick- 

 ness. One at a brickyard, in sec 10, T. 38, R. 11, 190 feet in depth, 

 enters rock at 159 feet; another near Clarendon Hills, 160 feet in depth, 

 does not enter rock. In each of these wells and in all the wells in that 

 vicinity the drift is mainly a blue till. In the well near Clarendon Hills a 

 very hard till was entered at a depth of 130 feet, which is perhaps an older 

 deposit than the soft till above it. 



In the vicinity of Downers Grove several wells have been sunk to a 

 depth of over 100 feet without entering- rock. One well enters rock at a 

 depth of 130 feet. In these wells sand is usually found below the blue till 

 at depths of 100 to 120 feet. The Manual of American Waterworks (1897) 

 reports that the public water supply is from two 10-inch deep wells. 



Near Lisle the drift is of gravelly constitution, and wells are usually 

 obtained at about 50 feet. A well south of the village, in section 12, is 157 

 feet in depth and entered rock at about 100 feet. This well was mainly 

 through till. 



At Wheaton the public water supply is from a well 178 feet in depth 

 and 10 inches in diameter, which is estimated to yield 300 gallons per 

 minute. The limestone was entered at a depth of 116 feet. About 2 miles 

 northeast of Wheaton, at an equally high elevation (750 feet), rock was 

 entered at a depth of only 70 feet. 



Several wells have been sunk in the vicinity of Prospect Park and 

 Lombard, which obtained water from gravel at about 50 feet. The drift in 

 that vicinity is gravelly. 



In the vicinity of Turner Junction wells are occasionally sunk to a 

 depth of about 100 feet without encountering rock. A well 3 miles south- 

 west of the village entered rock at a depth of 116 feet. A deep well has 

 been sunk by the Chicago and Northwestern Railway Company at Turner 

 Junction, but no data concerning it have been obtained. 



At Naperville wells usually reach water in gravel at a depth of about 

 30 feet. The drift east and south from this village is gravelly. It ranges 

 in thickness from a few feet up to 100 feet or more. In several places near 

 Naperville limestone quarries have been opened. West from Naperville in 

 the vicinity of Eola the drift is about 100 feet in depth, mainly till. 



mon xxxviii 38 



