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

Gahala, Amy M.

doi:10.3133/sir20175112

Cited by 3 publications

(25 citation statements)

References 15 publications

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“…In 2010, samples from a subset of the monitoring wells also were analyzed for volatile organic compounds, pesticides, and herbicides. The results of that study are presented in Gahala (2017). In short, the findings of that report indicated health-based standards were exceeded for arsenic in 22 percent of the monitoring wells sampled, sodium in 37 percent of the monitoring wells sampled, and nitrates in 2 percent of the monitoring wells sampled.…”

Section: Introductionmentioning

confidence: 91%

“…McHenry County, Ill. (611 square miles), is 35 miles northwest of the Chicago metropolitan area. As described in Gahala (2017), the county is generally geographically split by type of land use. The western half of the county is dominated by agricultural land use, and the eastern half is primarily urban land use.…”

Section: Description Of Study Areamentioning

confidence: 99%

“…Drinking water supplies for McHenry County are pumped from deeper bedrock aquifers such as the Cambrian-Ordovician, Silurian dolomite, and the shallow sand and gravel aquifers within glacial drift deposits (Woller and Sanderson, 1976). Directions of groundwater flow were determined by Meyer and others (2013) and Gahala (2017) and are briefly summarized in this section. Groundwater is replenished (recharge) from precipitation that falls onto the land surface and infiltrates through the soil and sediment to the water table, where it flows downward and laterally through hydraulically connected sediments over time.…”

Section: Description Of Study Areamentioning

confidence: 99%

“…This study focuses on the water quality within the shallow sand and gravel aquifers. The aquifer units within the shallow sand and gravel aquifers that the monitoring wells represent are described in detail in Meyer and others (2013) and Gahala (2017) (table 1). Two wells are screened in the upper 10 ft of the Shallow Bedrock Aquifer.…”

Section: Description Of Study Areamentioning

confidence: 99%

“…1 Aquifer unit names originated from Illinois State Water Survey (Meyer and others, 2013) and are used in this report for consistency purposes. See Gahala (2017) for further details on aquifer unit and monitoring well designations.…”

Section: Lowermentioning

confidence: 99%

See 4 more Smart Citations

Water quality of sand and gravel aquifers in McHenry County, Illinois, 2020 and comparisons to conditions in 2010

Gahala¹,

Gruhn²,

Murphy³

et al. 2022

Scientific Investigations Report

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Geological Survey for allowing the U.S. Geological Survey (USGS) to use their existing monitoring wells to increase the distribution of groundwater monitoring sites. The USGS appreciates Daniel Abrams from the Illinois State Water Survey for contributing information regarding production wells throughout McHenry County. The USGS appreciates this opportunity to provide a water-quality update, along with continued support of the McHenry County Groundwater Monitoring Network.The authors greatly appreciate the assistance from colleagues Monica Hall and Carolyn Soderstrom in sampling 47 monitoring wells and 3 surface-water sites during a pandemic and summertime heat. We also would like to thank our colleague Jennifer Sharpe for her assistance compiling figures for this report.

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Section: Introductionmentioning

confidence: 91%

Section: Description Of Study Areamentioning

confidence: 99%

Section: Description Of Study Areamentioning

confidence: 99%

Section: Description Of Study Areamentioning

confidence: 99%

Section: Lowermentioning

confidence: 99%

See 3 more Smart Citations

Water quality of sand and gravel aquifers in McHenry County, Illinois, 2020 and comparisons to conditions in 2010

Gahala¹,

Gruhn²,

Murphy³

et al. 2022

Scientific Investigations Report

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Calibrating a model to 30 years of data to capture the accumulation of chloride from winter deicers in a shallow aquifer

Cullen

Abrams

Mannix

et al. 2023

J American Water Resour Assoc

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Winter deicers are a major source of chloride contamination to shallow aquifers in northern latitudes. In the greater Chicago area of northeast Illinois, chloride has been accumulating for decades and in many places now exceeds the United States Environmental Protection Agency secondary standard of 250 mg/L. MODFLOW‐NWT and MT3D‐USGS were used to simulate the accumulation of chloride with 30 years of data in the shallow aquifer of Will County in northeast Illinois. This aquifer is composed of unconsolidated sediments, largely from glacial deposits, overlying a fractured dolomite bedrock. To calibrate to observed heads and chloride, the model needed refined geologic features, higher chloride concentrations on cells representing commercial or industrial lands, lower chloride concentrations on cells representing roads, and point source areas to speed chloride's emergence in the aquifer. These point sources are locally significant and could represent different anthropogenic or geologic features, such as municipal stormwater infrastructure. Future simulations indicate that chloride is not at steady state in the shallow aquifer and wells are at risk of exceeding the secondary standard if winter deicing applications are not reduced. It may take decades for the full impacts of reduced deicing rates to be observed in wells, owing to the long residence time of water in the aquifer. This transient model calibration was possible because of the 30‐year dataset collected by communities and government agencies.

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Simulation of groundwater and surface-water interaction and lake resiliency at Crystal Lake, City of Crystal Lake, Illinois

Gahala,

Bristow,

Sharpe

et al. 2024

Scientific Investigations Report

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

Cited by 3 publications

References 15 publications

Water quality of sand and gravel aquifers in McHenry County, Illinois, 2020 and comparisons to conditions in 2010

Water quality of sand and gravel aquifers in McHenry County, Illinois, 2020 and comparisons to conditions in 2010

Calibrating a model to 30 years of data to capture the accumulation of chloride from winter deicers in a shallow aquifer

Simulation of groundwater and surface-water interaction and lake resiliency at Crystal Lake, City of Crystal Lake, Illinois

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