Vadose Soils Articles & Analysis
22 articles found
Case Summary After three underground storage tanks were removed from the location of a convenience store, investigation showed that petroleum contamination was present in a small area near the former dispenser island. The vadose-zone contaminated soil was excavated and disposed off-site. Ground water monitoring showed that the ground water impact was limited to a ...
Convenience Store, Hamilton County, Florida, FDEP ID 8518526 After three underground storage tanks were removed from the location of a convenience store, investigation showed that petroleum contamination was present in small area near the former dispenser island. The vadose-zone contaminated soil was excavation and disposed off-site. Ground water monitoring ...
The vadose zone is the soil above the water table and represents a hydrological regime that can hold large amounts of water. Once water enters the vadose zone, it will only move in one dimension – up and down. In unsaturated soils, water will migrate upward because of evaporation and the uptake of water by plants and ...
The source area was aggressively treated using soil vapor extraction for impacted vadose zone soils and a downgradient in situ treatment barrier – sparge curtain – at the property boundary. ...
Moisture distribution in vadose zone soil is the most important parameter for land productivity and vegetation status of ecological systems, and is sensitive to temperature variation. ...
The system incorporated 89 electrodes with co-located vapor recovery (VR) wells to treat a soil volume of approximately 30,900 cubic yards (yd3). Active subsurface heating extended from approximately 12 feet below grade surface (ft bgs) to the competent bedrock surface where the depth to bedrock within the treatment volume ranged from 22 feet to 45 ft bgs. ...
After the source area was identified, approximately 1,200 cubic yards of filter cake mixed with contaminated soil were excavated along a rail line and an additional 5,000 cubic yards of filter cake were removed during construction of a soil vapor extraction (SVE) system. ...
Army Corps of Engineers (USAGE) Environmental Remediation Services Multiple Award Task Order Contract (MATOC), to perform electrical resistance heating (ERH) for the remediation of volatile organic compounds (VOCs) in the vadose zone soil and shallow groundwater at Operable Unit 1 (Well 12A) of the Commencement Bay - South Tacoma Channel Superfund site in Tacoma, ...
At site RSA-053, the heavy clay is underlain by very hard, uniform limestone with no apparent voids or soil inclusions. At site RSA-096, the limestone is riddled with soil-filled and water-filled voids; voids are also observed in the vadose zone soil. ...
Gas Thermal Remediation (GTRTM), using Thermal Conductive Heating (TCH), raised the temperature of the soils in the treatment zone of the former MGP site to an average temperature of approximately 325 degrees Celsius. Pilot Study Remediation The COC(s) identified at the Site include total petroleum hydrocarbons in the diesel (TPH-d) and motor oil (TPH-mo) range, as well as ...
Simulation of flow and contaminant transport through the vadose zone requires accurate parameterization of the soil hydraulic properties. This requirement is particularly important for soils with a complex structure. In the present study, a physically based closed-form expression for the bimodal unsaturated hydraulic conductivity function is ...
The site for this redevelopment formerly served as the rail yard foundry and locomotive maintenance center for Korea Rail (KORAIL) for over 100 years, which through the years, has resulted in significant environmental impacts to both soil and groundwater throughout the site. The Solution As part of the remedial effort, Directional Technologies, Inc., partnering with AMEC ...
The suitability of electron donor amendments will be assessed for effectiveness in stimulating biological reduction of perchlorate in three applications: unsaturated (vadose zone) soils; source area groundwater; and plume edge groundwater. ...
Product: TVOC Application: Soil Vapour Extraction (SVE) Customer: Geo Environmental Management Introduction Following an initial clean-up of gas oil spillage, TVOC was used to effectively monitor Soil Vapour Extractions (SVE) process emissions during the remediation of a residual vapour phase plume by Geo Environmental Management. Soil Vapour ...
Electrical Resistance Heating (ERH) is an aggressive remediation technology that can quickly reduce the mass of volatile organic compounds (VOCs) in soil and groundwater by over 99%. The process is often used to clean sites where other technologies have had limited success. ...
ABSTRACTThree soil aquifer treatment (SAT) columns were operated for five months to investigate the dependence of the treated water quality upon the depth of unsaturated vadose zone in terms of its organics, nitrogen and phosphorus contents. It was found that DOC removal was independent of the unsaturated vadose zone depth except during the ...
Given the success of the in-situ anaerobic bioremediation of perchlorate-impacted groundwater (up to 99-percent reduction of pre-treatment perchlorate concentrations ranging from 200,000 to 500,000 micrograms per liter [μg/L] after one year), ARCADIS proposed the evaluation of similar treatment of unsaturated soil to eliminate a continuing source of groundwater impacts. In ...
ByArcadis
MNA projection of degradation to (or through) vinyl chloride has thus been an important consideration in modeling vapor transfer from an affected groundwater zone through vadose zone soil to environmental receptors via inhalation. However, vinyl chloride has recently been found by the National Center for Environmental Assessment (NCEA) at the United States ...
Introduction Soil vapor extraction (SVE) is an in situ unsaturated (vadose) zone soil remediation technology in which a vacuum is applied to the soil to induce the controlled flow of air and remove volatile and some semivolatile contaminants from the soil. The gas leaving the soil may be treated ...
Contaminants in the newly exposed vadose zone are then accessible to vapor extraction, which can remove contaminants more efficiently than pump-and-treat. ...