NDLI: Temporal trends in concentrations of DBCP and nitrate in groundwater in the eastern San Joaquin Valley, California, USA

Content Provider	Springer Nature Link
Author	Burow, K. R. Dubrovsky, N. M. Shelton, J. L.
Copyright Year	2007
Abstract	Temporal monitoring of the pesticide 1,2-dibromo-3-chloropropane (DBCP) and nitrate and indicators of mean groundwater age were used to evaluate the transport and fate of agricultural chemicals in groundwater and to predict the long-term effects in the regional aquifer system in the eastern San Joaquin Valley, California. Twenty monitoring wells were installed on a transect along an approximate groundwater flow path. Concentrations of DBCP and nitrate in the wells were compared to concentrations in regional areal monitoring networks. DBCP persists at concentrations above the US Environmental Protection Agency’s maximum contaminant level (MCL) at depths of nearly 40 m below the water table, more than 25 years after it was banned. Nitrate concentrations above the MCL reached depths of more than 20 m below the water table. Because of the intensive pumping and irrigation recharge, vertical flow paths are dominant. High concentrations (above MCLs) in the shallow part of the regional aquifer system will likely move deeper in the system, affecting both domestic and public-supply wells. The large fraction of old water (unaffected by agricultural chemicals) in deep monitoring wells suggests that it could take decades for concentrations to reach MCLs in deep, long-screened public-supply wells, however.Les suivis en temps du pesticide 1,2-dibromo-3-chloropropane (DBCP), des nitrates et des indicateurs de l’âge moyen des eaux souterraines ont été utilisés dans le but d’estimer le transport et le devenir des produits agrochimiques dans les eaux souterraines, et de prédire leurs effets à long terme dans le système aquifère régional de la San Joaquin Valley orientale, en Californie. Vingt piézomètres ont été implantés en alignement, approximativement selon une ligne de flux souterrain. Les concentrations en DBCP et nitrates mesurées dans les piézomètres ont été comparées aux concentrations dans les réseaux de surveillance du secteur. Le DBCP dépasse continuellement la valeur limite fixée par l’US Environmental Protection Agency, à des profondeurs proches de 40 m sous le niveau piézométrique, et plus de 25 ans après son interdiction. Les concentrations en nitrates supérieures aux limites se retrouvent à des profondeurs supérieures à 20 m sous le niveau piézométrique. Les écoulements verticaux sont prépondérants, du fait des pompages intensifs et de la réalimentation par irrigation. Les concentrations élevées (supérieures aux limites) présentes dans la tranche la plus superficielle de l’aquifère sont susceptibles de migrer plus en profondeur dans le système, et d’affecter les puits privés et ceux destinés à l’alimentation en eau potable. Cependant, la large proportion d’eau ancienne (non affectée par les produits agrochimiques) dans les piézomètres profonds suggère que les limites de concentration ne seront pas dépassées avant longtemps dans les puits d’alimentation en potable, qui sont profonds et présentent des hauteurs crépinées conséquentes.La monitorización temporal del plaguicida 1,2-dibromo-3cloropropano (DBCP) y de los nitratos así como indicadores de la media de edad del agua subterránea han sido utilizados para evaluar el transporte y el destino de los compuestos químicos en el agua subterránea y para predecir los efectos a largo plazo en el sistema acuífero regional situado al este del Valle de San Joaquín, California. Se instalaron veinte pozos de control en un transecto situado aproximadamente siguiendo la línea de flujo del agua subterránea. Las concentraciones de DBCP y nitratos en los pozos se compararon con las concentraciones en la red de control regional. DBCP persiste con concentraciones por encima de los niveles máximos contaminantes (MCL) de la Agencia de Protección Medioambiental de Estados Unidos a profundidades cercanas a los 40 fm por debajo del nivel piezométrico, más de 25 años después de haber sido prohibido. Las concentraciones de nitratos por encima de MCL alcanzaron profundidades de más de 20 m por debajo del nivel piezométrico. Debido al bombeo intensivo y los retornos de riego, las líneas de flujo verticales son dominantes. Las altas concentraciones (por encima de MCLs) situadas en la parte superficial del sistema acuífero regional probablemente se moverán más profundamente en el sistema, afectando a los pozos domésticos y a los pozos de abastecimiento. No obstante, la alta proporción de aguas antiguas (no afectadas por compuestos químicos de origen agrícola) en los pozos de control profundos sugiere que pueden pasar décadas para que se alcancen concentraciones que alcancen MCLs en profundidad, en los pozos de abastecimiento totalmente ranurados.
Starting Page	991
Ending Page	1007
Page Count	17
File Format	PDF
ISSN	14312174
Journal	Hydrogeology Journal
Volume Number	15
Issue Number	5
e-ISSN	14350157
Language	English
Publisher	Springer-Verlag
Publisher Date	2007-01-16
Publisher Institution	International Association of Hydrogeologists
Publisher Place	Berlin, Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Agriculture Contamination San Joaquin Valley Groundwater monitoring Groundwater age Waste Water Technology Water Pollution Control Water Management Aquatic Pollution Geology Hydrogeology
Content Type	Text
Resource Type	Article
Subject	Earth and Planetary Sciences Water Science and Technology

Sl.	Authority	Responsibilities	Communication Details
1	Ministry of Education (GoI), Department of Higher Education	Sanctioning Authority	https://www.education.gov.in/ict-initiatives
2	Indian Institute of Technology Kharagpur	Host Institute of the Project: The host institute of the project is responsible for providing infrastructure support and hosting the project	https://www.iitkgp.ac.in
3	National Digital Library of India Office, Indian Institute of Technology Kharagpur	The administrative and infrastructural headquarters of the project	Dr. B. Sutradhar bsutra@ndl.gov.in
4	Project PI / Joint PI	Principal Investigator and Joint Principal Investigators of the project	Dr. B. Sutradhar bsutra@ndl.gov.in Prof. Saswat Chakrabarti will be added soon
5	Website/Portal (Helpdesk)	Queries regarding NDLI and its services	support@ndl.gov.in
6	Contents and Copyright Issues	Queries related to content curation and copyright issues	content@ndl.gov.in
7	National Digital Library of India Club (NDLI Club)	Queries related to NDLI Club formation, support, user awareness program, seminar/symposium, collaboration, social media, promotion, and outreach	clubsupport@ndl.gov.in
8	Digital Preservation Centre (DPC)	Assistance with digitizing and archiving copyright-free printed books	dpc@ndl.gov.in
9	IDR Setup or Support	Queries related to establishment and support of Institutional Digital Repository (IDR) and IDR workshops	idr@ndl.gov.in

Relations of hydrogeologic factors, groundwater reduction-oxidation conditions, and temporal and spatial distributions of nitrate, Central-Eastside San Joaquin Valley, California, USA

Detecting groundwater contamination of a river in Georgia, USA using baseflow sampling

The fate and transport of nitrate in shallow groundwater in northwestern Mississippi, USA

Groundwater movement, recharge, and perchlorate occurrence in a faulted alluvial aquifer in California (USA)

Groundwater flow patterns in the San Luis Valley, Colorado, USA revisited: an evaluation of solute and isotopic data

Assessment of regional change in nitrate concentrations in groundwater in the Central Valley, California, USA, 1950s–2000s

Investigating local variation in groundwater recharge along a topographic gradient, Walnut Creek, Iowa, USA

Simulation of spatial and temporal trends in nitrate concentrations at the regional scale in the Upper Dyle basin, Belgium

Mountain-block recharge, present and past, in the eastern Española Basin, New Mexico, USA

Temporal trends in concentrations of DBCP and nitrate in groundwater in the eastern San Joaquin Valley, California, USA

Similar Documents

Relations of hydrogeologic factors, groundwater reduction-oxidation conditions, and temporal and spatial distributions of nitrate, Central-Eastside San Joaquin Valley, California, USA

Detecting groundwater contamination of a river in Georgia, USA using baseflow sampling

The fate and transport of nitrate in shallow groundwater in northwestern Mississippi, USA

Groundwater movement, recharge, and perchlorate occurrence in a faulted alluvial aquifer in California (USA)

Groundwater flow patterns in the San Luis Valley, Colorado, USA revisited: an evaluation of solute and isotopic data

Assessment of regional change in nitrate concentrations in groundwater in the Central Valley, California, USA, 1950s–2000s

Investigating local variation in groundwater recharge along a topographic gradient, Walnut Creek, Iowa, USA

Simulation of spatial and temporal trends in nitrate concentrations at the regional scale in the Upper Dyle basin, Belgium

Mountain-block recharge, present and past, in the eastern Española Basin, New Mexico, USA

Temporal trends in concentrations of DBCP and nitrate in groundwater in the eastern San Joaquin Valley, California, USA