contaminated soil Articles
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Common Treatment Train for Nonhalogenated SVOCs
A treatment train is the combination of different treatment technologies. A system diagram of a common treatment train for nonhalogenated SVOCs is illustrated below. A thermally enhanced soil vapor extraction system is used to pull SVOC vapor from the contaminated soil. Electrodes are installed in the contamination zone to enhance the desorption of SVOCs from the contaminated soil. The ...
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Former gas works below existing house
Client: Local Authority, Central Belt of Scotland Consultant: RPS Challenge: Remove hydrocarbon contaminated material from surrounding areas of houses built upon a former gasworks site. Reinstate existing landscaping. Applied technology: Excavation and removal, then backfill with clean material The solution: Soilutions were initially contracted to remove two metres of contaminated soil in the ...
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The 1998 PCB Disposal Amendments: Guide to the 1998 PCB "Mega Rule"
INTRODUCTION On June 29, 1998, the U.S. Environmental Protection Agency (EPA) promulgated a sweeping series of changes in the PCB regulations under the Toxic Substances Control Act (TSCA). Commonly known as the Mega-Rule or PCB Disposal Amendments (due to its focus largely on waste management issues), this long-awaited rule encompasses more than 80 changes in the regulations and spans more ...
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Brownfields redevelopment; Understanding your environmental responsibilities
Brownfields are properties that have, or may have, contamination or the stigma of contamination that hinders the reuse of land for new development. The lure to these properties is great – seemingly prime, large tracts of land being sold for relatively inexpensive prices; the vision of unrestricted development; putting residential communities on these lands and reaping a great return. To further ...
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Standard Chlorine of Delaware Remediation
By designing a 70-foot deep barrier wall, Black & Veatch was able to cut off contaminant source areas from a creek near New Castle, Delaware. The groundwater treatment system that Black & Veatch designed prevents site contamination from reaching the underlying drinking water aquifer. The Standard Chlorine of Delaware Site is a 65 acre area including an abandoned chlorobenzene ...
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Nyack MGP Site (Isotec Case Study 29)
Site Location: Nyack, NY Contamination: Bedrock contaminated with non-aqueous phase liquid (NAPL) and MGP-related compounds. Primary contaminants of concern (COCs) include volatile organic compounds (VOCs), Poly-nuclear aromatic hydrocarbons (PAH's) and total petroleum hydrocarbons (TPH). Levels of COCs reached 6 mg/l for VOCs and 1,200 mg/l for PAHs in the dissolved phase and 8,500 mg/l for ...
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In-Situ thermal treatment of MGP waste and creosote
Abstract: Remediation of coal tar at former Manufactured Gas Plant (MGP) sites, and creosote associated with wood preservative sites is challenging due to the viscous nature of the dense non-aqueous phase liquid (DNAPL) and the modest solubility and vapor pressure of the contaminants of concern (COCs). DNAPL seepage into surface water bodies, as well as groundwater plumes formed by the most ...
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Vapor Intrusion Testing/Sampling in Buildings
What is Vapor Intrusion? Vapor intrusion occurs when volatile chemicals lodged in soil or groundwater rise to the surface and are released into the air. This can occur in the open air or into buildings, offices, factories, warehouses, vacant, or abandoned. Vapor intrusion testing/sampling is a method of determining if known or suspected ground contamination is a result in these chemical vapors ...
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Is it clean or contaminated soil? Using petrogenic versus biogenic GC‐FID chromatogram patterns to mathematically resolve false petroleum hydrocarbon detections in clean organic soils: A crude oil spiked peat microcosm experiment
The Canadian Council of Ministers of the Environment (CCME) Reference Method for the Canada‐Wide Standard (CWS) for Petroleum Hydrocarbons (PHC) in Soil provides chemistry analysis standards and toxicity guidelines for the remediation of contaminated sites. However, these methods can co‐extract natural biogenic organic compounds (BOCs) from organic soils, causing false exceedences of toxicity ...
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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. ...
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Superior voc protection for project situated on former railroad site case study
Project: Smith Performing Arts Center Location: Las Vegas, NV Products: Liquid Boot Gas Vapor Mitigation System, GeoVent™ Gas Venting System, Ultraseal Waterproofing System Background: Vapor intrusion has become a significant environmental issue for regulators, industry leaders, and concerned residents nationwide. The use of a spray-applied gas vapor barrier to protect against the threat ...
By CETCO
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In Situ TPH Bioremediation with Petrox
With Petrox microbes, in situ TPH bioremediation reduced the concentration of petroleum in soil at a former gas station from 9,500 mg/kg to 52 mg/kg. The impacted soil was at more than 20 feet deep. Injection of calcium peroxide provided the oxygen needed for metabolism of the petroleum by Petrox microbes. The post treatment sampling was 90 days after the bioaugmentation, so that even though ...
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Vapor intrusion and indoor air quality due diligence during property transactions
Vapor intrusion (i.e. the migration of volatile chemicals from contaminated soil and/or ground water through the subsurface into overlying building structures) as a contributing indoor air has become a growing concern for property owners and prospective purchasers in recent years as it can cause significant indoor air quality problems. This is largely due to the increased focus on this issue by ...
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In Situ Bioremediation of TPH with Petrox
Petrox reduced the concentration of TPH in soil at a former gas station from 9,500 mg/kg to 52 mg/kg. The impacted soil was at more than 20 feet deep. Injection of calcium peroxide provided the oxygen needed for metabolism of the petroleum by Petrox microbes. The post treatment sampling was 90 days after the bioaugmentation, so that even though the average remediation rate was 105 mg/kg/day, the ...
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Case study: Redwood City
GTR + C3 Overview Neighborhood: Downtown Heating Tubes: 9 Heating Period: 6.5 Months Destruction Rate Efficiency: > 99% Contaminant: PCE, TCE Geology: Silt Silty Clay Volume: 142 yd3 Overview The former Dry Cleaner site was located in Redwood City, California, contaminated by tetrachloroethylene (PCE) with a maximum concentration of 7,100 μg/kg in soils at a depth of 5 feet below ...
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Bioventing
Introduction Bioventing is a promising new technology that stimulates the natural in situ biodegradation of any aerobically degradable compounds in soil by providing oxygen to existing soil microorganisms. In contrast to soil vapor vacuum extraction, bioventing uses low air flow rates to provide only enough oxygen to sustain microbial activity. Oxygen is most commonly supplied through direct air ...
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Data Requirements Air Emissions/Off-Gases
Predictive modeling may be usefelected to represent the system (e.g., SVE treatment, incinerator, etc.), and site and contaminant informaul in estimating emissions from a site or treatment system. An appropriate theoretical model is stion is used to estimate gross emissions. Because many variables affect emission rates, this approach is limited by the representativeness of the model and by the ...
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Non-intrusive site investigation (UXO, CWM concerns)
BEACON personnel used global positioning system (GPS) equipment to map out site locations. The soil-gas data clearly identified source areas of Trichloroethene (TCE) as well as other compounds of concern. The results showed the location of chlorinated contamination, which correlated well with data from a geophysical survey. While the flux chambers were in the field, more than nine inches of rain ...
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Project - Environmental Due Diligence in Ohio
Environmental Due Diligence and Risk Management Phase I Environmental Site Assessment Phase Ii Environmental Site Assessment Vapor Intrusion and Indoor Air Quality Issue(s): Former Drycleaners, Environmental Due Diligence (EDD), No Further Action (NFA), Rescinded NFA/Covenant Not to Sue (CNS) BLDI was retained by a national consulting firm in 2019 to assist with EDD work for a site at ...
By BLDI
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Properties and Behavior of Fuels
Fuel contaminants are generally nonhalogenated. Information presented for nonhalogenated VOCs and nonhalogenated SVOCs may also be appropriate for many of the fuel contaminants presented in this subsection. Contamination by fuel contaminants in the unsaturated zone exists in four phases: vapor in the pore spaces; sorbed to subsurface solids; dissolved in water; or as NAPL. The nature and extent ...
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