Author: David A. BenderPublisher:
ISBN:
Category : Electronic government information
Languages : en
Pages : 6
Book Description
LakeVOC, a Computer Model to Estimate the Concentration of Volatile Organic Compounds in Lakes and Reservoirs
Author: David A. BenderPublisher:
ISBN:
Category : Electronic government information
Languages : en
Pages : 6
Book Description
Fact Sheet
Author: Monthly Catalog of United States Government Publications
Author: Publisher:
ISBN:
Category : Government publications
Languages : en
Pages : 1000
Book Description
Options for Minimizing Fuel-Related Contaminants in Lakes and Reservoirs
Author: Contra Costa Water DistrictPublisher: IWA Publishing
ISBN: 1843398648
Category : Science
Languages : en
Pages : 280
Book Description
The primary objective of the report was to provide reservoir managers with technical and economic information regarding the possible methods for controlling the levels of MTBE and BTEX in reservoir water supplies. This report comprehensively evaluates options to give practical data and advice to water managers who wish to consider the benefits of dual use (use to store drinking water supplies and use as recreational attractions) without introducing unacceptable health risks into the water bodies being managed. Originally published by AwwaRF for its subscribers in 2003
Mass Transport of Volatile Organic Compounds Between the Saturated and Vadose Zones
Author: Monte S. HarnerPublisher:
ISBN: 9781423573920
Category : Groundwater
Languages : en
Pages : 99
Book Description
Volatile organic compounds (VOCs) dissolved in the saturated zone are transported into the vadose zone primarily by gaseous phase diffusion. If the saturated zone is remediated, VOCs present in the vadose zone may become a secondary source of contamination for the groundwater The amount of VOCs that remain in the vadose zone is dependent on site hydrology, soil properties, and the chemical properties of the contaminants. The purpose of this study was to determine what conditions caused VOC concentrations in the vadose zone to significantly recontaminate the saturated zone. A one-dimensional numerical model was developed to investigate the transport of a VOC, trichioroethylene, between the saturated and vadose zones under a variety of conditions. The model featured steady-state unsaturated water flow and transient contaminant transport Transport mechanisms included aqueous phase advection-dispersion and gaseous phase diffusion. Partitioning between the water, gas, and soil compartments were modeled as equilibrium processes. Sensitivity analyses were performed on several variables including soil type (homogeneous and heterogeneous profiles), water infiltration rate and vadose zone depth. Results indicated that recontamination was most significant rate, and vadose zone depth. Results indicated that recontamination was most significant in the presence of heterogeneous soils, low infiltration rates and deep vadose zones.
Authorized and Operating Purposes of Corps of Engineers Reservoirs
Author: William K. JohnsonPublisher:
ISBN:
Category : Flood control
Languages : en
Pages : 208
Book Description
The Colli Albani Volcano
Author: R. FunicielloPublisher: Geological Society of London
ISBN: 9781862393073
Category : Alban Hills (Italy)
Languages : de
Pages : 404
Book Description
The Colli Albani Volcano contains 21 scientific contributions on stratigraphy, volcanotectonics, geochronology, petrography and geochemistry, hydrogeology, volcanic hazards, geophysics and archaeology, and a new 1:50 000 scale geological map of the volcano. The proximity to Rome and the interconnection between volcanic and human history also make this volcano of interest for both specialists and non-specialists.
A Numerical Investigation of Metabolic Reductive Dechlorination in DNAPL Source Zones
Author: John Anthony ChristPublisher:
ISBN:
Category :
Languages : en
Pages : 626
Book Description
Among the most intractable environmental remediation problems are those involving the release of dense non-aqueous phase liquids (DNAPLs), such as chlorinated solvents, to the subsurface. Research efforts have focused on the use of numerical models to investigate reductions in contaminant concentrations due to partial mass removal and improvements in the performance of complementary source zone remediation technologies. Previous numerical investigations, however, have been limited to two-dimensional systems. Furthermore, a lack of models capable of simulating the most promising complementary technology, metabolic reductive dechlorination, has limited its application. This work developed and applied compositional multiphase numerical simulators to examine the influence of dimensionality (two-dimensions versus three-dimensions) on DNAPL source zone simulations and to investigate the benefits of stimulating metabolic reductive dechlorination at a chlorinated ethene-DNAPL contaminated site. Results from the dimensionality investigation showed that the simulation of DNAPL migration, entrapment, and dissolution in two dimensions provided reasonable approximations to the behavior simulated in three dimensions. Commonly employed saturation distribution and mass recovery metrics were approximately equivalent. Flux- averaged concentrations simulated in two dimensions, however, tended to be three to four times higher than those simulated in three dimensions. This difference was attributed to dilution at the down gradient boundary. An alternative metric, mass flux reduction, however, yielded better agreement.
Author: 
Author: Jason J. Gurdak