Sentences with phrase «by groundwater wells»
The dynamic works both ways: While streams can be drained by groundwater wells, they can be fed by underground aquifers, the USGS has found.
https://www.scientificamerican.com/ Not exact matches
If approved in the Legislature, the resolution would fund the unit — responsible for drilling monitoring wells to evaluate groundwater pollution across the county at sites like the former Grumman facility in Calverton — using money from the water quality fund, a fund established by a voter - approved, quarter - penny sales tax.
DEEP WATER Deep groundwater wells, such as this hand - pumped well in Uganda being operated by water resources scientist Scott Jasechko, can contain mixes of old and young water and traces of pollution.
A two - year study of fracking wells in Los Angeles, conducted by consultants Cardno Entrix and funded by the oil industry, monitored 15 environmental factors before and after fracking, including groundwater chemistry, vibration at the surface and at depth, and methane release.
The pumping of groundwater, by contrast, has been left largely unregulated for the better part of the past century across California and parts of Arizona.
Homebuilders found they could circumvent limits on groundwater pumping for large residential developments by building just a few homes at a time, because single homes could drill new water wells without a permit.
Ewing's Russian colleagues, led by Alexander Novikov of the Russian Academy of Sciences, sampled the groundwater taken from wells up to four kilometers from the scene of original contamination, where radioactivity levels reach roughly 1,000 becquerels (nuclei decaying per second) per liter.
With more than 17 million Americans now living within one mile of an oil and gas well, there is concern about the possible contamination of surface and groundwater by trace metals, radioactive isotopes and other inorganic compounds released in these areas, they point out.
The team collected samples of methane from settings such as lakes, swamps, natural gas reservoirs, the digestive tracts of cows, and deep ancient groundwater, as well as methane made by microbes in the lab.
Data from roughly 275,000 groundwater samples in the High Plains and Central Valley aquifers show that many Americans live less than two - thirds of a mile from wells that often far exceed the uranium guideline set by the Environmental Protection Agency.
As part of the study, the team, led by co-author Dr. Joan McLean, pulled groundwater samples from 20 privately owned wells located in Northern Utah's Cache County.
A new report by UCLA researchers says the city could, eventually — if it does a better job of capturing local stormwater, increases the use of recycled water, cleans up groundwater and steps up conservation measures.
By Jim Steele A better accounting of natural groundwater discharge is needed to constrain the range of contributions to sea level rise.
Chemical pollution by sewage from industry and agriculture, sewage household detergents loaded and laundry, as well as the infiltration of toxic substances, has already reached groundwater.
Thus, I might by using Nash - Sutcliffe only (which I wouldn't generally recommend) and obtain a high score (good calibration), but only at the expense of groundwater values which are unrealistic physically.
Modern hydraulic fracturing combined with horizontal drilling allows multiple wells to be drilled from one spot, reducing the size of the drilling area above ground by as much as 90 percent.4 Fracking is the key to unlocking vast U.S. shale resources, freeing up oil and natural gas that previously was inaccessible while protecting groundwater supplies and the environment.
Although LNG proponents still characterize shale gas production as «clean» and without methane leakage or groundwater contamination, field observations by the David Suzuki Foundation suggest that many leaky wells are not appearing in the B.C. database.
In the past two years alone, a series of surface spills, including two blowouts at wells operated by Chesapeake Energy and EOG Resources and a spill of 8000 gallons of fracking fluid at a site in Dimock, Pa., have contaminated groundwater in the Marcellus Shale region.
The team collected samples of methane from settings such as lakes, swamps, natural gas reservoirs, the digestive tracts of cows, and deep ancient groundwater, as well as methane made by microbes in the lab.
Good intentions aside, the region's pesticide - intensive agricultural practices may impede any sizable attempt to restore the 16,000 - square - mile ecosystem, mainly by leaching chemicals into the groundwater.
Well, for years many scientists have speculated that these massive, inhumane swine «factories» could become incubators for virulent super-pathogens that could quickly spread as a pandemic — whether it's through direct contact, contaminated groundwater, or by air travel.
The average methane concentration in shallow groundwater in active drilling areas fell within the defined action level (10 — 28 mg L - 1) for hazard mitigation recommended by the US Office of the Interior (13), and our maximum observed value of 64 mg L - 1 is well above this hazard level (Fig. 3).
Mean values ± standard deviation of methane concentrations (as milligrams of CH4 L - 1) and carbon isotope composition in methane in shallow groundwater δ13C - CH4 sorted by aquifers and proximity to gas wells (active vs. nonactive)