Groundwater-quality data and regional trends in the Virginia Coastal Plain, 1906-2007

McFarland, E. Randolph

doi:10.3133/pp1772

Cited by 18 publications

(74 citation statements)

References 26 publications

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“…Dense saline water at the transition zone between freshwater and saltwater causes the confined groundwater to discharge by upward leakage across intervening confining units and zones. In addition, stagnant saltwater within sediments filling the Chesapeake Bay impact crater has been theorized to cause a lateral divergence of flow to either side of the crater (McFarland, 2010).…”

Section: Groundwater Conditionsmentioning

confidence: 99%

“…Because of their vertical proximity, sediments of several individual geologic formations were considered by previous studies to be closely connected hydraulically and thereby were designated as a single Piney Point aquifer (Hamilton and Larson, 1988;Laczniak and Meng, 1988;Meng and Harsh, 1988;Harsh and Laczniak, 1990;McFarland and Bruce, 2006;McFarland, 2010). The sediments were assumed to function as a continuous medium through which water moves essentially uninterrupted at local and regional scales.…”

Section: Previous Studiesmentioning

confidence: 99%

“…The USGS NWIS database contains specific capacities for 53 wells open to the Piney Point aquifer, which were identified using a previously documented method (McFarland, 2010) with well-construction data and the regional hydrogeologic framework (McFarland and Bruce, 2006). Records published by the Maryland Geological Survey (Drummond, 1984) contain specific capacities for 123 wells specified as open to the Piney Point aquifer.…”

Section: Well Specific Capacitymentioning

confidence: 99%

“…The chemical composition of water in the entire Piney Point aquifer in the Virginia Coastal Plain has been previously described (McFarland, 2010). Previously compiled hydrochemical data for the designated study area surrounding the productive limestone of the Piney Point aquifer are selectively summarized here (see section "Introduction").…”

Section: Water Qualitymentioning

confidence: 99%

“…In order to provide a valid context within which to make resource-management decisions, the VA DEQ has also maintained a sound scientific understanding of Virginia Coastal Plain geology and hydrology through a cooperative program of hydrogeologic investigation with the U.S. Geological Survey (USGS). Advancements made by recent studies include discovery of the Chesapeake Bay impact crater (Powars and Bruce, 1999), revision of the hydrogeologic framework (McFarland and Bruce, 2006), digital model simulation of groundwater flow (Heywood and Pope, 2009), characterization of groundwater chemical quality (McFarland, 2010), detailed analysis of the Potomac aquifer (McFarland, 2013), and development of a strategy to monitor the movement of saltwater .…”

Section: Introductionmentioning

confidence: 99%

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Hydrogeologic framework and hydrologic conditions of the Piney Point aquifer in Virginia

McFarland¹

2017

Scientific Investigations Report

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For more information on the USGS-the Federal source for science about the Earth, its natural and living resources, natural hazards, and the environment-visit http://www.usgs.gov or call 1-888-ASK-USGS.For an overview of USGS information products, including maps, imagery, and publications, visit http://www.usgs.gov/pubprod/.Any use of trade, firm, or product names is for descriptive purposes only and does not imply endorsement by the U.S. Government.Although this information product, for the most part, is in the public domain, it also may contain copyrighted materials as noted in the text. Permission to reproduce copyrighted items must be secured from the copyright owner. Suggested citation:McFarland, E.R., 2017, Hydrogeologic framework and hydrologic conditions of the Piney Point aquifer in Virginia: U.S. Geological Survey Scientific Investigations Report 2017-5041, 63 p., 2 pl., and CD-ROM, https://doi.org/10.3133/ sir20175041. AcknowledgmentsThis study was supported by the Virginia Department of Environmental Quality (VA DEQ). Special thanks for program planning go to Scott W. Kudlas and T. Scott Bruce of the VA DEQ. C. Richard Berquist of the Virginia Division of Geology and Mineral Resources generously provided geologic logs of boreholes in the southwestern part of the study area, and John T. Haynes of James Madison University generously provided petrographic analyses of limestone of the Piney Point Formation. Thanks also are extended to the many drillers and owners of water-supply wells, who provided well data from across the Virginia Coastal Plain. The scientific integrity of this report was aided greatly by reviews from Mark D. Kozar and Jason P. Pope of the U.S. Geological Survey (USGS). The editorial and graphical quality of the report was aided greatly by Ruth Larkins and Denis Sun of the USGS.This project has been funded in part by the U.S. Environmental Protection Agency (EPA) under assistance agreement BG-98392505-1 to the VA DEQ. The contents of this document do not necessarily reflect the views and policies of the EPA, nor does the EPA endorse trade names or recommend the use of commercial products mentioned in this document. DatumVertical coordinate information is referenced to the National Geodetic Vertical Datum of 1929 (NGVD 29).Horizontal coordinate information is referenced to the North American Datum of 1927 (NAD 27).Altitude, as used in this report, refers to distance above the vertical datum. Supplemental InformationConcentrations of chemical constituents in water are given in milligrams per liter (mg/L). Hydrogeologic Framework and Hydrologic Conditions of the Piney Point Aquifer in VirginiaBy E. Randolph McFarland AbstractThe Piney Point aquifer in Virginia is newly described and delineated as being composed of six geologic units, in a study conducted by the U.S. Geological Survey in cooperation with the Virginia Department of Environmental Quality (VA DEQ). The eastward-dipping geologic units include, in stratigraphically ascending order, the

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Section: Groundwater Conditionsmentioning

confidence: 99%

Section: Previous Studiesmentioning

confidence: 99%

Section: Well Specific Capacitymentioning

confidence: 99%

Section: Water Qualitymentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Hydrogeologic framework and hydrologic conditions of the Piney Point aquifer in Virginia

McFarland¹

2017

Scientific Investigations Report

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Evaluation of groundwater travel time through a multilayered aquifer using multiple tracers and a novel transport approximation

Martinez,

Widdowson

2024

Hydrogeol J

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Aquifer long-term replenishment (ALTR) is a managed aquifer recharge (MAR) strategy by which reclaimed water is continuously delivered by injection wells to depleted, confined aquifer systems to increase groundwater storage and increase the potentiometric surface over space and time. One implication of large-scale continuous recharge is a large radial impact and the need to quantify transport in radially extensive strata. The use of an artificial tracer can be cost-prohibitive as the radial front moves further from the injection well. This investigation employs a novel approximation for radial transport to track the radial front of recharge, injectate constituents and simulation of tracer breakthrough concentrations under transient recharge rates, variable depth-dependent flow distributions over time, and variable influent concentrations. Six constituents—sulfate, chloride, total organic carbon (TOC), fluoride, 1,4-dioxane and N-nitrosodimethylamine (NDMA)—were chosen to evaluate conservative transport and semiqualitatively assess attenuation of nonconservative constituents relative to conservative tracers. Results indicate that sulfate acted as the most effective conservative tracer for characterization of transport and travel times at the study site. The analytical model was modified to account for variable operations at the MAR demonstration facility and was effective in simulating breakthrough curves over the period of performance, particularly sulfate concentrations at a monitoring well located 104 m from the injection well. The behavior of the remaining constituents is discussed, and the qualities of an effective intrinsic tracer for future ALTR projects are identified.

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Modeling groundwater-level responses to multiple stresses using transfer-function models and wavelet analysis in a coastal aquifer system

Yang,

McCoy

2023

Journal of Hydrology

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Groundwater-quality data and regional trends in the Virginia Coastal Plain, 1906-2007

Cited by 18 publications

References 26 publications

Hydrogeologic framework and hydrologic conditions of the Piney Point aquifer in Virginia

Hydrogeologic framework and hydrologic conditions of the Piney Point aquifer in Virginia

Evaluation of groundwater travel time through a multilayered aquifer using multiple tracers and a novel transport approximation

Modeling groundwater-level responses to multiple stresses using transfer-function models and wavelet analysis in a coastal aquifer system

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