scholarly journals Effects of increased pumpage on a fractured-bedrock aquifer system in central Orange County, New York

1985 ◽  
Keyword(s):  
New York ◽  
Orange County ◽  
Aquifer System ◽  
Fractured Bedrock ◽  
Fractured Bedrock Aquifer ◽  
Bedrock Aquifer

Multi-scale hydrogeologic characterization of a leaky till–mantled fractured bedrock aquifer system

2015 ◽  
Vol 52 (12) ◽  
pp. 1945-1955 ◽  
Author(s):  
William G. Lukas ◽  
Don J. DeGroot ◽  
David W. Ostendorf ◽  
Erich S. Hinlein
Keyword(s):  
Hydraulic Conductivity ◽  
Coarse Grained ◽  
Small Scale ◽  
Data Sets ◽  
Aquifer System ◽  
Monitoring Wells ◽  
Fractured Bedrock ◽  
Decadal Scale ◽  
Fractured Bedrock Aquifer ◽  
Bedrock Aquifer

The paper presents hydrogeologic properties for a leaky till–mantled fractured bedrock aquifer system based on geophysical and hydraulic tests performed at a drumlin located in northeastern Massachusetts, USA. The site profile consists of a fractured bedrock aquifer overlain by a 30 m thick unweathered, coarse-grained till aquitard. Steady state, decadal scale, hydraulics varied little until seasonal irrigation pumping was initiated in recent years, causing a substantial annual drawdown in the aquifer and leakage from the overlying till. High frequency hydraulic head data sets collected in monitoring wells record the hydraulic response to the irrigation pumping. These data sets, together with results from small scale slug and purge tests performed in monitoring wells, are used to characterize the hydrogeologic behavior of this groundwater system. Geophysical logging performed in bedrock wells confirmed the presence of numerous flowing fractures. The large-scale continuum analysis of the fractured bedrock aquifer response to the irrigation pumping yields transmissivity values consistent with those determined from the small-scale, short-term purge test results. The low hydraulic conductivity till has a significant impact on the drawdown behavior of the fractured bedrock aquifer. Calibrated values from the collective data sets and analyses result in the following properties for the 30 m thick unweathered till: hydraulic conductivity K′ = 7.2 × 10−9 m/s, transmissivity T′ = 2.3 × 10−8 m2/s, and storativity S′ = 2.7 × 10−4, and for the underlying fractured bedrock aquifer: T = 6.5 × 10−6 m2/s with an average fracture aperture of 46 μm and hydraulic conductivity Kf = 1.3 × 10−3 m/s. These results should describe similar unweathered coarse-grained till–mantled fractured bedrock aquifer systems and provide useful data for preliminary analyses prior to any site-specific investigations.

Hydrogeochemical and isotopic evaluation of VOC commingled plumes in a weathered fractured bedrock aquifer treated with thermal and bioremediation

2022 ◽  
pp. 103940
Author(s):  
SashaT. Hart ◽  
Reginaldo A. Bertolo ◽  
Maria S. Agostini ◽  
Roland Feig ◽  
Paulo Lojkasek-Lima ◽  
...  
Keyword(s):  
Fractured Bedrock ◽  
Fractured Bedrock Aquifer ◽  
Bedrock Aquifer

Assessing toluene biodegradation under temporally varying redox conditions in a fractured bedrock aquifer using stable isotope methods

2019 ◽  
Vol 165 ◽  
pp. 114986 ◽  
Author(s):  
Philipp Wanner ◽  
Ramon Aravena ◽  
Jeremy Fernandes ◽  
Michael BenIsrael ◽  
Elizabeth A. Haack ◽  
...  
Keyword(s):  
Stable Isotope ◽  
Redox Conditions ◽  
Fractured Bedrock ◽  
Fractured Bedrock Aquifer ◽  
Bedrock Aquifer ◽  
Toluene Biodegradation
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