ISSN:1069-3629    

DOI:10.1111/j.1745-6592.1995.tb00551.x

出版商:Blackwell Publishing Ltd    

年代:1995

数据来源: WILEY

ISSN:1069-3629    

DOI:10.1111/j.1745-6592.1995.tb00552.x

出版商:Blackwell Publishing Ltd    

年代:1995

数据来源: WILEY

ISSN:1069-3629    

DOI:10.1111/j.1745-6592.1995.tb00553.x

出版商:Blackwell Publishing Ltd    

年代:1995

数据来源: WILEY

ISSN:1069-3629    

DOI:10.1111/j.1745-6592.1995.tb00554.x

出版商:Blackwell Publishing Ltd    

年代:1995

数据来源: WILEY

摘要:

AbstractThe Safe Drinking Water Act directs EPA to promulgate requirements for disinfection of ground water‐based drinking water systems. The Ground‐ water Disinfection Rule regulatory workgroup, made up of representatives from EPA, the states, and other interested parties, is actively considering the issues for the wide range of elements necessary to ensure a regulation that will protect public health and can be feasibly implemented. This regulation is likely to require disinfection of ground water sources and systems found to be contaminated or vulnerable to contaminat

ISSN:1069-3629    

DOI:10.1111/j.1745-6592.1995.tb00555.x

出版商:Blackwell Publishing Ltd    

年代:1995

数据来源: WILEY

摘要:

AbstractThe feasibility of surface application for remediating monoaromatic hydrocarbons (benzene, toluene, ethylbenzene, and xylenes — termed BTEX as a croup) dissolved in ground water under field conditions was investigated at a site within Canadian Forces Base. Borden. Ontario. The surface area was 25 m2and underlain by 3 to 3.5 m of unsaturated sands soil. For periods of at least 216 hours, between 43 and 72 cm/d of water containing BTEX at concentrations that averaged between 8 and 11 mg/L were continuously applied by drip irrigation. Nitrogen was added to the soil as a nutrient for the final third of the investigation.Before the applied water reached the water table. BTEX mass losses ranged from of to essentially KM) percent. Less than 6 percent of the BTEX mass losses could be attributed to volatilization from the unsaturated soil. The remaining BTEX mass losses were attributed to biodegradation, mostly in the top 50 cm of the soil, which contained more inorganic nitrogen and organic carbon than the deeper soil. Biodegradation rates increased with applied concentration, nitrogen addition, and exposure to BTEX. Benzene concentrations in ground water attained compliance with Canadian and American drinking water standards only after nitrogen applicatio

ISSN:1069-3629    

DOI:10.1111/j.1745-6592.1995.tb00556.x

出版商:Blackwell Publishing Ltd    

年代:1995

数据来源: WILEY

摘要:

AbstractGround water in a residential area of Perth. Western Australia, was contaminated with fenamiphos and atrazine. probably as a result of the storage and handling of these chemicals at a residential properly. Sampling of existing wells indicated that atrazine and fenamiphos concentrations in ground water beneath a neighboring property were 2000 μg/L and 1000 μg/L, respectively. Fenamiphos concentrations were sufficiently high to be toxic on prolonged skin contact, and contamination posed a public health threat to nearby residents with private wells. Management of the contamination problem included restricting ground water use in the area and using a recovery well to pump contaminated ground wate

ISSN:1069-3629    

DOI:10.1111/j.1745-6592.1995.tb00557.x

出版商:Blackwell Publishing Ltd    

年代:1995

数据来源: WILEY

摘要:

AbstractSarasota County is one of 10 generalized areas of the continental United States known to haw high concentrations of naturally occurring radium in fresh ground water (Chandler 1989). Various authors have conducted investigations to examine the distribution of radium in ground water, rivers, and estuaries. They concluded that ground water was the source of radium, but rivers were also enriched with radium as a result of the interaction with ground water. The Glulf of Mexico also has areas with radium enrichment resulting from geothermal springs with concentrations as high as 51 picocuries per liter. During 1986 and 1987. the Health and Rehabilitative Services of the state of Florida collected ground water data for radium analysis of private drinking water wells. These data were used to develop a contour map of radium‐226 concentrations for coastal Sarasota Count

ISSN:1069-3629    

DOI:10.1111/j.1745-6592.1995.tb00558.x

出版商:Blackwell Publishing Ltd    

年代:1995

数据来源: WILEY

摘要:

AbstractAs part of a study of the flow dynamics and sampling environment around a high‐capacity irrigation well, it was necessary to design and install a multi‐level monitoring well network close to the production well. A requirement of the monitoring well network was the capability of continuous pumping over periods typical of those used during water sample collection. This was accomplished through the use of a control valve and air manifold system connected 10 a common gasoline engine‐operated air compressor. The system provided adequate air pressure to operate 24 half‐size bladder pumps to depths between 21 feet (6.4 m) and 56 feet (17.1 m) below the surface. Preliminary data collected from the monitoring well network indicate that the system will meet the requirements of the high‐capacity w

ISSN:1069-3629    

DOI:10.1111/j.1745-6592.1995.tb00559.x

出版商:Blackwell Publishing Ltd    

年代:1995

数据来源: WILEY

摘要:

AbstractA pool of dense nonaqueous phase liquid (DNAPI.) containing TCE and other chlorinated solvents has been removed from the subsurface at Hill Air Force Base, Uthah. as part of an interim remedial action. The removal of the DNAPI. pool means that future off‐site migration of dissolved contaminants in the ground water is minimized, and costs for final remedial actions are reduced. A pump‐and‐treat system recovered more than 23.000) gallons of DNAPI. and one million gallons of contaminated ground water from the aquifer. The efficiency of this remedial action was evaluated on the basis of extensive field and laboratory data. The behavior of DNAPI. flow in the aquifer sands was characterized by collecting core samples from two borings in the DNAPL pool and measuring relative permeabilities and DMAPI. saturation. Core Hooding results show that approximately one‐third of the DNAPI. originally in the pool is not recovered by water displacement, but remains as a residual saturation held in place by capillary pressure. However, subsequent Hooding with two pore volumes of surfactant solution reduced the residual DNAPI. saturation in the sand by one order of magnitude. Analytical and numerical models for the DNAPI flow behavior at the site were developed. This is the first time that such models have been developed and applied to an actual DNAPI. pumping lest conducted in the field. Because measured permeabilities and residual saturations were used lo calibrate the models. the model predictions could be used lo provide valuable insights into the controlling mechanisms for DNAPL recovery. The data collection and modeling procedures outlined in this paper can be used lo enhance the efficiency and minimize the cost 10 clean up this and other DNAPI.‐contamina

ISSN:1069-3629    

DOI:10.1111/j.1745-6592.1995.tb00560.x

出版商:Blackwell Publishing Ltd    

年代:1995

数据来源: WILEY