Revision History for SIR 2017-5112

Amy M. Gahala

Hydrogeology and water quality of sand and gravel aquifers in McHenry County, Illinois, 2009-14, and comparison to conditions in 1979

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Posted online October 26, 2017

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Revised and reposted August 17, 2022, version 1.1


The text version was modified. Text on page 7 was adjusted to change "Water-table elevations ranged from 731 to 956 ft above NAVD 88" to "Water-table elevations ranged from about 733 to 956 ft above NAVD 88."

Figure 5 was revised. Contour lines and values and directional flow arrows were corrected. Water levels were changed on figure 5: 16-GRF-I (from 858.88 ft to 860.76 ft); 17-ALG-S (from 879.39 to 878.63 ft); 43N8E-3.7d (from 960 to 880.31 ft); WAUC-02-12 (from 737.5 to 733.96 ft); 8-GRN-I (from 849.23 to 850.08 ft); 44N9E-20.7c (from 762.35 to 737.35); 43N8E-8.2c (from 924.45 to 875.67 ft); Boone Creek 05549000 (from 720.22 to 770.45 ft); and surface water site 05550000 (from 931.102 to 731.10). Boone Creek 05549000 label was previously missing and added to this revised version. Other labels, 16-GRF and 17-ALG, were also corrected to include the full name "16-GRF-I" and "17-ALG-S". Contours along the Fox River were adjusted to not cross the stream per the stream elevation data.