Factors affecting water quality in selected carbonate aquifers in the United States, 1993-2005

Lindsey, Bruce D.; Berndt, Marian P.; Katz, Brian G.; Ardis, Ann F.; Skach, Kenneth A.

doi:10.3133/sir20085240

Cited by 17 publications

(11 citation statements)

References 38 publications

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“…2). Finding multiple pesticides in samples from unconfined carbonate aquifers overlain by agricultural land use in this study is consistent with findings from other studies (Lindsey et al, 2009; G.C. Johnson et al, 2011).…”

Section: Resultssupporting

confidence: 93%

“…Other studies have indicated that the Piedmont and Valley and Ridge carbonate aquifers are particularly vulnerable to pesticide contamination. For example, a study by Lindsey et al (2009) in selected carbonate aquifers in the United States reported that the Piedmont and the Valley and Ridge carbonate aquifers had the most frequent detections of pesticides, along with the Biscayne aquifer in Florida, out of 12 aquifers assessed. The Piedmont and the Valley and Ridge carbonate aquifers also had the highest percentages of agricultural land use and the highest reported use of atrazine and metolachlor, along with the Silurian Devonian/Upper carbonate aquifer in eastern Iowa and southern Minnesota (Lindsey et al, 2009).…”

Section: Resultsmentioning

confidence: 99%

“…Pesticide occurrence is not unique to carbonate aquifers; however, these vulnerable settings present a good test case for studies evaluating changes in pesticide concentrations over time. In these settings, detected compounds are numerous, typically have long half‐lives, and are leachable; short half‐life or nonleachable compounds generally are not observed (Loper et al, 2009; Lindsey et al, 2009; Lindsey et al, 2010).…”

Section: Noncensored and Censored Matched Pair Information For Five Fmentioning

confidence: 99%

See 2 more Smart Citations

Evaluating Changes in Matrix-Based, Recovery-Adjusted Concentrations in Paired Data for Pesticides in Groundwater

Zimmerman

Breen

2012

J. Environ. Qual.

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Pesticide concentration data for waters from selected carbonate‐rock aquifers in agricultural areas of Pennsylvania were collected in 1993–2009 for occurrence and distribution assessments. A set of 30 wells was visited once in 1993–1995 and again in 2008–2009 to assess concentration changes. The data include censored matched pairs (nondetections of a compound in one or both samples of a pair). A potentially improved approach for assessing concentration changes is presented where (i) concentrations are adjusted with models of matrix‐spike recovery and (ii) area‐wide temporal change is tested by use of the paired Prentice‐Wilcoxon (PPW) statistical test. The PPW results for atrazine, simazine, metolachlor, prometon, and an atrazine degradate, deethylatrazine (DEA), are compared using recovery‐adjusted and unadjusted concentrations. Results for adjusted compared with unadjusted concentrations in 2008–2009 compared with 1993–1995 were similar for atrazine and simazine (significant decrease; 95% confidence level) and metolachlor (no change) but differed for DEA (adjusted, decrease; unadjusted, increase) and prometon (adjusted, decrease; unadjusted, no change). The PPW results were different on recovery‐adjusted compared with unadjusted concentrations. Not accounting for variability in recovery can mask a true change, misidentify a change when no true change exists, or assign a direction opposite of the true change in concentration that resulted from matrix influences on extraction and laboratory method performance. However, matrix‐based models of recovery derived from a laboratory performance dataset from multiple studies for national assessment, as used herein, rather than time‐ and study‐specific recoveries may introduce uncertainty in recovery adjustments for individual samples that should be considered in assessing change.

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Section: Resultssupporting

confidence: 93%

Section: Resultsmentioning

confidence: 99%

Section: Noncensored and Censored Matched Pair Information For Five Fmentioning

confidence: 99%

See 1 more Smart Citation

Evaluating Changes in Matrix-Based, Recovery-Adjusted Concentrations in Paired Data for Pesticides in Groundwater

Zimmerman

Breen

2012

J. Environ. Qual.

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“…However in recent years, overpumping has caused the decline of the water levels and upconing of saline water from deeper zones to move into the fresh-water system. This increases chloride concentrations in wells, hence affecting water suitability for agricultural purposes (Spechler, 1994;Lindsey et al, 2009). Excessive irrigation with saline water is particularly problematic for these soils with an impermeable soil layer because of the inability to use mitigation practices like leaching fraction (i.e.…”

Section: Introductionmentioning

confidence: 99%

Soil moisture distribution under drip irrigation and seepage for potato production

Reyes‐Cabrera

Zotarelli

Dukes

et al. 2016

Agricultural Water Management

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“…Karst aquifers are recognized for their vulnerability to contamination, but their complexities make characterization of vulnerability difficult ( Goldscheider 2005 ; Ford and Williams 2007 ; Fournier et al 2007 ). Although karst aquifers occur in a wide variety of settings with varying characteristics, they are generally subject to rapid changes in flow and discharge, a high degree of surface-water/groundwater interaction, and extreme vulnerability to water-quality impairment ( Lindsey et al 2009 ). The EA and UFA provide drinking water to millions of people, and contaminants such as nutrients and organic compounds have been documented in both aquifers ( Fahlquist and Ardis 2004 ; Katz 2004 ; Berndt and Crandall 2009 ; Musgrove et al 2010 ).…”

Section: Introductionmentioning

confidence: 99%

Factors Affecting Public‐Supply Well Vulnerability in Two Karst Aquifers

Musgrove¹,

Katz

Fahlquist

et al. 2014

Groundwater

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Karst aquifers occur in a range of climatic and geologic settings. Nonetheless, they are commonly characterized by their vulnerability to water-quality impairment. Two karst aquifers, the Edwards aquifer in south-central Texas and the Upper Floridan aquifer in western Florida, were investigated to assess factors that control the movement of contaminants to public-supply wells (PSWs). The geochemistry of samples from a selected PSW or wellfield in each aquifer was compared with that from nearby monitoring wells and regional PSWs. Geochemistry results were integrated with age tracers, flow modeling, and depth-dependent data to refine aquifer conceptual models and to identify factors that affect contaminant movement to PSWs. The oxic Edwards aquifer is vertically well mixed at the selected PSW/wellfield, although regionally the aquifer is geochemically variable downdip. The mostly anoxic Upper Floridan aquifer is affected by denitrification and also is geochemically variable with depth. In spite of considerable differences in geology and hydrogeology, the two aquifers are similarly vulnerable to anthropogenic contamination. Vulnerability in studied PSWs in both aquifers is strongly influenced by rapid karst flowpaths and the dominance of young (<10 years) groundwater. Vulnerability was demonstrated by the frequent detection of similar constituents of concern in both aquifers (nitrate, atrazine, deethylatrazine, tetrachloroethene, and chloroform). Specific consideration of water-quality protection efforts, well construction and placement, and aquifer response times to land-use changes and contaminant loading are discussed, with implications for karst groundwater management.

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Factors affecting water quality in selected carbonate aquifers in the United States, 1993-2005

Cited by 17 publications

References 38 publications

Evaluating Changes in Matrix-Based, Recovery-Adjusted Concentrations in Paired Data for Pesticides in Groundwater

Evaluating Changes in Matrix-Based, Recovery-Adjusted Concentrations in Paired Data for Pesticides in Groundwater

Soil moisture distribution under drip irrigation and seepage for potato production

Factors Affecting Public‐Supply Well Vulnerability in Two Karst Aquifers

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