Showing results for: groundwater flow Articles
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Importance of discrete-zone monitoring systems in fractured-bedrock wells -- A case study from the University of Connecticut landfill, Storrs, Connecticut
Monitoring of hydraulic head is an important part of many hydrogeologic investigations because it is used to determine the rates and directions of ground-water flow. In unconfined aquifers, open-hole water levels can be used to establish meaningful conceptual models of ground-water flow. In heterogeneous fractured-rock aquifers, however, where the hydraulic head can be different for each ...
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Gasoline spill from underground storage tanks - Conoco, Inc.
LOCATION: Watsonville, CaliforniaPROJECT DATE: July, 1987 to July, 1988CLIENT: Conoco, Inc. BACKGROUND: A gasoline spill from underground storage tanks at a service station in Watsonville was discovered. Approximately 1,500 gallons were lost to the shallow aquifer of low permeability. Physical recovery operations were not possible. The California Regional Water Quality Control Board (Central ...
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Gasoline pipeline break - Sun Oil Company
LOCATION: Ambler, PAPROJECT DATE: July, 1972 to January, 1974CLIENT: Sun Oil Company BACKGROUND: A pipeline break spilled an estimated 3,186 barrels of high octane gasoline into an aquifer composed of a highly fractured dolomite. The gasoline was contained by pumping nearby wells. Physical recovery of the gasoline continued until no longer productive an estimated 1,000 barrels (42,000 ...
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Detailed hydraulic assessment using a high-resolution piezocone coupled to the GeoVIS
Department of Defense (DoD) ground water assessment and remediation projects require cost effective methods for determining the direction and rate of ground water and contaminant flow. Monitoring wells have typically been used to estimate these parameters. However, detailed three-dimensional ground water and contaminant flow pathways cannot typically be delineated using monitoring well data. ...
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Gasoline pipeline break - Sun Pipeline Company
LOCATION: Southeastern, PennsylvaniaPROJECT DATE: November, 1984 to October, 1991CLIENT: Sun Pipe Line Company BACKGROUND: A pipeline break resulted in the spill of 100,000 gallons of gasoline to a highly fractured shale aquifer. A number of private drinking water wells were affected. In excess of 10 homeowners were forced to vacate due to gasoline vapors in their homes. Producing wells were ...
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Detailed hydraulic assessment using a high-resolution piezocone
Department of Defense (DoD) ground water assessment and remediation projects require cost effective methods for determination of the direction and rate of ground water and contaminant flow. Monitoring wells have typically been used to estimate these parameters. However, detailed three-dimensional ground water and contaminant flow pathways cannot typically be delineated using monitoring well data. ...
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Numerical Evaluation of Effectiveness of Drainwells in Dewatering Overburden at Surface Coal Mines
Abstract: Typical sedimentary sequences overlying coal seams consist of interbedded sandstones, siltstones, shales, and rider coal seams. In many surface coal mine settings, these sediments are saturated; and prior dewatering of them is necessary for effective and economic mining, including the stacking of saturated spoils. Such sedimentary sections usually have a very low vertical hydraulic ...
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Gasoline storage tank spill - Exxon
LOCATION: Millville, New JerseyPROJECT DATE: June, 1975 to September, 1976CLIENT: Exxon BACKGROUND: A gasoline spill from a storage tank was found when gasoline fumes were noticed in basements adjacent to the gasoline station. An undetermined amount of gasoline was lost to the shallow, unconfined sandy aquifer of high porosity and permeability. An extensive clay bed lay beneath the aquifer. ...
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Achieving exemplary compliance case study
Challenge: A major integrated oil company retained the services of Antea Group to manage environmental liability at a bulk storage and distribution facility that supplies gasoline, diesel fuel and other refined petroleum product to Minnesota, Iowa and Wisconsin. The property presented a series of unique challenges including multiple LNAPL plumes, LNAPL identified within karst bedrock, ...
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Evaluating groundwater sustainability for fractured crystalline bedrock
Water sustainability is an important concern for communities that rely on groundwater in fractured rock; yet the complexity of the fracture system and the unknown rate of recharge make quantifying groundwater availability difficult, if not impossible, using conventional water balance calculations. This study provides a new approach for estimating groundwater sustainability in fractured rock ...
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Relations between groundwater flow in an unconfined aquifer and seepage patterns in a closed-basin lake in glacial terrain
Groundwater dynamics affect lake water budgets, but its major factors and mechanisms still need clarification. This study evaluates the effects of surrounding groundwater flow on seepage direction and assesses factors that affect seepage flux in a closed-basin lake in northeastern Estonia – Lake Martiska. A piezometric map was used to determine directions of groundwater flow around the ...
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Modeling the dynamics of the freshwater-saltwater interface in response to construction activities at a coastal site
Abstract: A numerical model was developed to evaluate the response of groundwater flow and the fresh-saltwater interface in relation to the construction of a particle accelerator at the coastal plain of Tokaimura, Japan. Undisturbed conditions were initially simulated and validated against field observations as a prerequisite for the analysis of predictive scenarios. Groundwater heads and the ...
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Interpreting the seasonal and long-term trend of nitrate in both groundwater and spring water in a typical headwater wetland with well-defined groundwater flow pathways
Timescale problems of nitrate behavior (i.e. seasonal variation and long-term trend) in headwater are closely related to its hydrological process. In a typical agricultural headwater catchment in the Chiba prefecture, Japan, the groundwater nitrate concentration showed an increasing trend, while for spring water, a substantial decreasing trend was observed during our monitoring period. Two ...
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The Best Ground Water Treatment Methods
Many homes and businesses depend on ground water or surface water as a vital water source. Unfortunately, much of this water has not been filtered through municipal water treatment and distribution technology. This means that the water many people consume, cook with, and use for basic hygiene can contain potentially harmful particles, including pathogens, tiny organic matter, sediment, industrial ...
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Chlorofluorocarbon (CFC) remediation case study 2002
Project Description The project site is located in Northern California and was leased and operated as a chemical storage and solvent recovery operation from late 1972 through April 1993. During an earlier period, the site may also have been used as a waste transfer station. Previous investigations indicate that soil and groundwater at the site, and groundwater down-gradient (westward) from the ...
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Tidal influences on unconfined water levels in wells.
Tidal effects have the potential to measurably affect water level measurements and the estimation of groundwater flow direction and gradient. This has significant implications for the prediction and monitoring of contaminant plumes in coastal areas. Studies were conducted at two near-coastal sites in San Diego County, California, to evaluate the impact of tidal variability on the interpretation ...
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Bank filtration as managed surface-groundwater interaction
Riverbank Filtration (RBF) is a managed surface-groundwater interaction process where surface water is induced to flow to pumping wells installed on the banks of rivers and lakes. We present the surface-groundwater interaction issues at various geomorphologic settings, from the headwaters of a river to its confluence with the oceans/lakes. In each reach, the factors for the sustainable operation ...
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Data Types in Environmental Data Management
ESdat is a specialist environmental database system; used to validate and import a broad spectrum of Environmental Data and to help users analyze and report it. ESdat can manage many types of environmental data including the following:Laboratory ResultsAutomated import of laboratory dataStore certified PDF copies of lab reportImport all QA data (blanks, duplicates,holding times etc..)Most ...
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Stable lead isotopes reveal a natural source of high lead concentrations to gasoline-contaminated groundwater
Concentrations of total lead as high as 1,600 g/L were detected in gasoline-contaminated and uncontaminated groundwater at three gasoline-release sites in South Carolina. Total lead concentrations were highest in turbid groundwater samples from gasoline-contaminated and uncontaminated wells, whereas lower turbidity groundwater samples (collected using low-flow methods) had lower total lead ...
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Modeling Leachate Contamination and Remediation of Groundwater at a Landfill Site
Leachate contamination of an aquifer from a landfill sitewas simulated using the groundwater flow and transport model SUTRA developed by the U.S. Geological Survey. The model calibration was performed by spatially adjusting the hydraulic conductivity in order to capture the measured hydraulic head spatial variation and then by adjusting the dispersivity and porosity match the measured chloride ...
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