Soil Vapor Articles on Environmental XPRT

Soil Vapor Extraction (In Situ)

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 to recover or destroy the contaminants, depending on local and state air discharge regulations. ...

Jan. 1, 1997

By Federal Remediation Technologies Roundtable

Soil Vapor Extraction (Ex Situ)

Introduction: Ex situ soil vapor extraction (SVE) is a full-scale technology in which soil is excavated and placed over a network of aboveground piping to which a vacuum is applied to encourage volatilization of organics. Soil piles are generally covered with a geomembrane to prevent volatile emissions and to prevent the soil from becoming saturated by precipitation. The process includes a ...

Oct. 1, 1997

By Federal Remediation Technologies Roundtable

Horizontal Soil Vapor Extraction Wells

As part of a Corrective Action Plan (CAP) submitted to NYSDEC, a consultant selected Horizontal Soil Vapor Extraction Wells (HSVE) to expand an on-site vapor extraction system in New York. Directional Technologies worked with the consultant on the horizontal well screen design and well layout of three (3) HSVE wells, spaced 50-feet apart, and constructed with 4-inch Schedule 80 PVC materials. Due ...

Apr. 19, 2017

By Directional Technologies, Inc.

Thermally Enhanced Soil Vapor Extraction

Introduction Thermally enhanced SVE is a full-scale technology that uses electrical resistance/electromagnetic/fiber optic/radio frequency heating or hot-air/steam injection to increase the volatilization rate of semi-volatiles and facilitate extraction. Thermally enhanced SVE is normally a short- to medium-term technology. Electrical Resistance Heating Electrical resistance heating uses ...

Jan. 1, 1997

By Federal Remediation Technologies Roundtable

Steam Injection with Soil Vapor Extraction Remediation

Project description for soil vapor extraction / steam injection remediation by GWS Environmental Contractors Inc. The use and implementation of steam injection remediation on No 2. heating oil. Project Location: 18 Institute Street Freehold, NJ. Project: Residential Fuel Oil Remediation Project using Steam/SVE. I. Extent of Contamination: Fuel oil contamination exists in the rear yard ...

Mar. 12, 2015

By GWS Environmental Contractors Inc.

Soil Sampling under Buildings and Solving Vapor Intrusion using Horizontal Drilling

The Issue: The New Jersey Department of Environmental Protection (NJDEP) mandated soil and groundwater sampling under an active pharmaceutical company manufacturing building in order to address vapor intrusion inside the building. Installation of vertical borings and wells through the building slab was not practicable without profound disruption of manufacturing activities inside the building. ...

Oct. 22, 2010

By Directional Technologies, Inc.

Off-Gas Treatment Technologies for Soil Vapor Extraction Systems: State of the Practice

Untitled Document EXECUTIVE SUMMARY This document provides state-of-the-practice information on off-gas treatment technologies for soil vapor extraction ...

Jun. 1, 2006

By US EPA - Environmental Protection Agency

Horizontal Soil Vapor Extraction and Horizontal Air Sparge Wells Case Study-

Directional Technologies Is The Expert At Horizontal Soil Vapor Extraction A horizontal soil vapor extraction well and two horizontal air sparge wells rapidly remediate contamination in situ under a research and development facility. These horizontal wells were installed by environmental directional driller Directional Technologies with no access to inside this sensitve facility. ...

Jul. 6, 2011

By Directional Technologies, Inc.

Chlorinated solvent soil vapor extraction (SVE) remediation case study 2005

Project Description An active industrial facility in South Central Los Angeles was impacted by tetrachloroethylene (PCE) and trichloroethylene (TCE; former staging area degreasing) operations as a part of its operations. A phased approach to soil vapor extraction (SVE) remediation was employed: the goal of Phase I was to attain high contaminant mass removal rates with very high VOC vapor ...

Oct. 13, 2010

By GEO Inc

Vapor Intrusion: Risks and Challenges

Vapor Intrusion (VI), defined as the migration of volatile contaminants from the subsurface into the indoor air of overlying buildings, is a major and challenging environmental issue for both regulators and the regulated community—one that continues to elicit heated debate among stakeholders. Eight factors associated with the VI pathway that contribute to its challenging nature are discussed ...

Feb. 1, 2007

By Air & Waste Management Association (A&WMA)

In-well Vapor Stripping - Technology Overview

In-well vapor stripping technology involves the creation of a ground-water circulation pattern and simultaneous aeration within the stripping well to volatilize VOCs from the circulating ground-water. Air-lift pumping is used to lift ground-water and strip it of contaminants. Contaminated vapors may be drawn off for aboveground treatment or released to the vadose zone for biodegradation. ...

Jan. 1, 1997

Mass to Concentration Tie-In for Passive Soil Gas Surveys: Improved Technique for Source Area, Spatial Variability and Vapor Intrusion Assessment

Abstract The mass to concentration tie-in [MtoC Tie-In] correlates passive soil gas (PSG) data in mass to active soil gas data in concentration determined by EPA Method TO-17. Passive soil gas surveys consist of rapid deployment of hydrophobic sorbents (dozens to several hundred locations typically installed in one day) to a depth of six-inches to three-feet in a grid pattern with exposure ...

Jan. 27, 2009

By Beacon Environmental Services, Inc.

EPA studies identify techniques for critical leak testing prior to soil-vapor sampling

Researchers at EPA’s National Risk Management Research Laboratory (NRMRL) in Ada, OK, are developing quality assurance (QA) measures for soil-gas and sub-slab sampling methods that help differentiate contaminant vapors due to vapor intrusion from background sources. Recent research focused on measures to identify leakage of ambient air into conventional vapor probes, which can significantly ...

Sep. 1, 2009

By USEPA - Technology Innovation and Field Services Division (TIFSD)

Soil Fracturing

Introduction Fracturing is an enhancement technology designed to increase the efficiency of other in situ technologies in difficult soil conditions. The fracturing extends and enlarges existing fissures and introduces new fractures, primarily in the horizontal direction. When fracturing has been completed, the formation is then subjected to vapor extraction, either by applying a vacuum to all ...

Jan. 1, 1997

By Federal Remediation Technologies Roundtable

Andover, Vapor Extraction and Refrigerated Condensation Case study

Vapor Extraction and Refrigerated Condensation was used as a primary source removal technology to remediate high concentrations of recalcitrant chlorinated solvent compounds at the WDE Site in Minnesota. The use of Refrigerated Condensation has achieved high mass removal rates and will reduce the lifecycle costs and time of remediation. History 6,600 drums of hazardous ...

May 13, 2014

By In-Situ Oxidative Technologies, Inc (ISOTEC) - Soil & Groundwater Remediation

U.S. EPA Updates Vapor Intrusion Guidance

Untitled Document The attention of EPA and state environmental agencies to assessing the vapor intrusion pathway at potentially ...

Jan. 1, 2005

By AECOM

Water and vapor movement with condensation and evaporation in a sandy column

The diffusion of warm, humid air into an initially cold, dry, sandy column was analyzed to study the movement of water vapor and liquid water under nonisothermal and low water content conditions. The analysis was performed using the HYDRUS-1D code. While the water retention curve of sand was measured experimentally, the unsaturated hydraulic conductivity function was inversely estimated from the ...

Mar. 11, 2009

By Soil Science Society of America (SSSA)

Vapor Intrusion Issues Risk Occupants’ Health

Vapor intrusion occurs when a gaseous substance migrates into a building. For example, volatile organic compounds and other gases can migrate from contaminated soils and groundwater through cracks in foundations or sewer lines and enter a building. Vapor intrusion can create an indoor environment that damages structural materials and puts building occupants’ health at ...

May 5, 2011

By Ultraviolet Devices, Inc.

How Close to Contamination does a Property need to be for Vapor Intrusion to be a Concern?

Cinnaminson, NJ, February 19, 2013 There are numerous sites across North America that have contaminated soil or groundwater due to manmade pollution. Some of these sites have been a problem for decades and as communities have grown, more and more residential and commercial properties have been built above or near these areas. A major issue for properties built near these contaminated ...

Feb. 19, 2013

By EMSL Analytical, Inc.

Enhanced Vapor Intrusion Mitigation via Horizontal Remediation Wells

Vapor Intrusion (VI) is a potential concern at any building - existing or planned, located near soil or groundwater contaminated with volatile organic compounds (VOCs). Conventional installation technologies (vertical wells) can fall short, especially when large structures such as factories, hangars, and offices buildings are involved because they typically involve expensive and lengthy ...

Aug. 16, 2016

By Directional Technologies, Inc.

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