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If groundwater is contaminated, will water from the well be contaminated?

Eberts SM - Ground Water (2014)

View Article: PubMed Central - PubMed

Affiliation: U.S. Geological Survey, 6480 Doubletree Ave., Columbus, OH 43229. smeberts@usgs.gov.

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all samples from 932 public wells tapping 30 regionally extensive aquifers contained detectable extensive aquifer... In contrast, the percentage of well-drained soils—which does not account Consequently, the degree of protection for public wells in this area could would respond faster to land use change designed to reduce chemical fluxes to the water table, whereas wells with small fractions of young water would benefit from greater in-well dilution of concentrations in public wells represent the tip-of-the-iceberg (in terms of water quality) from protecting or treating groundwater sources of drinking water are limited... It is therefore beneficial drinking-water contaminants and which vulnerability factor(s) are most important for those wells so because of the relatively large aquifer volume and associated conditions sampled by public wells; however, public-supply-well samples can be interpreted in ways that lead to valuable observations and conclusions... resulting data can help resource managers explain and forecast the quality of water from their wells.

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Location of selected wells having low concentrations of manmade and naturally occurringdrinking-water contaminants, typifying different aquifer-well combinations. Woodbury, Connecticut:volatile organic compounds (VOCs), nitrate, pesticides, uranium, and radon; unconsolidated sediment(sand); mostly oxic conditions; short well screen (10s of feet); and young water in well. NearTampa, Florida: VOCs, nitrate, pesticides, arsenic, uranium, and radon; carbonate rocks; oxic andanoxic conditions; open hole; and mix of very young and generally young water in well. York,Nebraska: VOCs, uranium, and arsenic; layered unconsolidated sediment (sand); anoxic conditions inconfined aquifer; well screen beneath clay confining unit; and mix of young and old water inwell.
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fig01: Location of selected wells having low concentrations of manmade and naturally occurringdrinking-water contaminants, typifying different aquifer-well combinations. Woodbury, Connecticut:volatile organic compounds (VOCs), nitrate, pesticides, uranium, and radon; unconsolidated sediment(sand); mostly oxic conditions; short well screen (10s of feet); and young water in well. NearTampa, Florida: VOCs, nitrate, pesticides, arsenic, uranium, and radon; carbonate rocks; oxic andanoxic conditions; open hole; and mix of very young and generally young water in well. York,Nebraska: VOCs, uranium, and arsenic; layered unconsolidated sediment (sand); anoxic conditions inconfined aquifer; well screen beneath clay confining unit; and mix of young and old water inwell.

Mentions: Site-specific assessments are best for identifying the most beneficial protection mechanisms foran individual well, which can differ even for wells with similar contaminant detections. Forexample, source water protection in Woodbury, Connecticut (Figure1), depends on the entire community, because the groundwater throughout the local sandaquifer is oxic and very young (generally <15 years). Preferential flow along karst featuresin a semi-confined carbonate-rock aquifer used for public supply near Tampa, Florida, causesdifferent public-supply wells to be more or less hydraulically connected to an overlying, morevulnerable sand aquifer. Consequently, the degree of protection for public wells in this area couldbe tied to the similarity between the water chemistry at the wells and the water chemistry in thesand aquifer. In York, Nebraska, preventing down-wellbore flow in multi-aquifer irrigation andsupply wells that are located upgradient of confined-aquifer public-supply wells would best preventshallow contaminated groundwater from reaching the water-supply aquifer in the first place (Eberts et al. 2013).


If groundwater is contaminated, will water from the well be contaminated?

Eberts SM - Ground Water (2014)

Location of selected wells having low concentrations of manmade and naturally occurringdrinking-water contaminants, typifying different aquifer-well combinations. Woodbury, Connecticut:volatile organic compounds (VOCs), nitrate, pesticides, uranium, and radon; unconsolidated sediment(sand); mostly oxic conditions; short well screen (10s of feet); and young water in well. NearTampa, Florida: VOCs, nitrate, pesticides, arsenic, uranium, and radon; carbonate rocks; oxic andanoxic conditions; open hole; and mix of very young and generally young water in well. York,Nebraska: VOCs, uranium, and arsenic; layered unconsolidated sediment (sand); anoxic conditions inconfined aquifer; well screen beneath clay confining unit; and mix of young and old water inwell.
© Copyright Policy - open-access
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC4265273&req=5

fig01: Location of selected wells having low concentrations of manmade and naturally occurringdrinking-water contaminants, typifying different aquifer-well combinations. Woodbury, Connecticut:volatile organic compounds (VOCs), nitrate, pesticides, uranium, and radon; unconsolidated sediment(sand); mostly oxic conditions; short well screen (10s of feet); and young water in well. NearTampa, Florida: VOCs, nitrate, pesticides, arsenic, uranium, and radon; carbonate rocks; oxic andanoxic conditions; open hole; and mix of very young and generally young water in well. York,Nebraska: VOCs, uranium, and arsenic; layered unconsolidated sediment (sand); anoxic conditions inconfined aquifer; well screen beneath clay confining unit; and mix of young and old water inwell.
Mentions: Site-specific assessments are best for identifying the most beneficial protection mechanisms foran individual well, which can differ even for wells with similar contaminant detections. Forexample, source water protection in Woodbury, Connecticut (Figure1), depends on the entire community, because the groundwater throughout the local sandaquifer is oxic and very young (generally <15 years). Preferential flow along karst featuresin a semi-confined carbonate-rock aquifer used for public supply near Tampa, Florida, causesdifferent public-supply wells to be more or less hydraulically connected to an overlying, morevulnerable sand aquifer. Consequently, the degree of protection for public wells in this area couldbe tied to the similarity between the water chemistry at the wells and the water chemistry in thesand aquifer. In York, Nebraska, preventing down-wellbore flow in multi-aquifer irrigation andsupply wells that are located upgradient of confined-aquifer public-supply wells would best preventshallow contaminated groundwater from reaching the water-supply aquifer in the first place (Eberts et al. 2013).

View Article: PubMed Central - PubMed

Affiliation: U.S. Geological Survey, 6480 Doubletree Ave., Columbus, OH 43229. smeberts@usgs.gov.

AUTOMATICALLY GENERATED EXCERPT
Please rate it.

all samples from 932 public wells tapping 30 regionally extensive aquifers contained detectable extensive aquifer... In contrast, the percentage of well-drained soils—which does not account Consequently, the degree of protection for public wells in this area could would respond faster to land use change designed to reduce chemical fluxes to the water table, whereas wells with small fractions of young water would benefit from greater in-well dilution of concentrations in public wells represent the tip-of-the-iceberg (in terms of water quality) from protecting or treating groundwater sources of drinking water are limited... It is therefore beneficial drinking-water contaminants and which vulnerability factor(s) are most important for those wells so because of the relatively large aquifer volume and associated conditions sampled by public wells; however, public-supply-well samples can be interpreted in ways that lead to valuable observations and conclusions... resulting data can help resource managers explain and forecast the quality of water from their wells.

Show MeSH
Related in: MedlinePlus