napl contamination Articles

  • Organoclay permeable reactive barrier utilized to control napl contamination case study

    Project : Bay Project - Union Pacifi c Railroad Location : Escanaba, MI Products : Bulk Organoclay, Reactive Core Mat Background: The groundwater at a former creosote wood treating site was contaminated by non-aqueous phase liquid (NAPL). The contaminated groundwater was a threat to the nearby fresh water bay when NAPL and ...


    By CETCO

  • A mixed-integer non-linear programming with surrogate model for optimal remediation design of NAPLs contaminated aquifer

    A mixed-integer non-linear programming (MINLP) with surrogate model was introduced to derive the optimal surfactant enhanced aquifer remediation (SEAR) process (remediation cost minimisation and removal rate maximisation) at a nitrobenzene-contaminated site. First, a 3D multi-phase flow simulation model was developed to simulate the SEAR process; using a radial basis function artificial neural ...


    By Inderscience Publishers

  • Case study - NAPL forensics analysis at tank farm in Boston

    Ambient Engineering, Inc. (Concord, MA) used Sitelab to investigate and remediate a former tank farm along Boston Harbor contaminated by a large, subsurface plume of commingled diesel fuel and No. 6 fuel oil. Loading racks (above) are suspected to have contributed to most of the site’s contamination. Light Non Aqueous Phase Liquids (LNAPL) collected from 40 monitoring wells were tested ...


    By Sitelab Corporation

  • Impact of Non-Aqueous Phase Liquids (NAPLs) on Groundwater Remediation

    Nonaqueous Phase Liquids (NAPLs) are immiscible (undissolved) hydrocarbons in the subsurface that exhibit different behavior and properties than dissolved contaminant plumes. NAPLs have a tremendous impact on the remediation of contaminated aquifers, as it is very difficult or impossible to remove all of the NAPL from a hazardous waste site once released to the subsurface. Although many NAPL ...


  • Remediation of TCE NAPL in active Alleyway Arlington, Texas - Case Study

    Project Summary TRS Group, Inc. (TRS) completed a standard Fixed Price Remediation (SFPR) of trichioroethene (TCE) in soil in Arlington, TX using electrical resistance heating (ERH) in 2012, The system incorporated 19 electrodes with horizontal vapor recovery (VR) wells to treat a soil volume of approximately 4,155 cubic yards (yd3) located between two active buildings. Active ...


    By TRS Group, Inc.

  • Stabilizing the NAPL Threat: In-situ biogeochemical stabilization and flux reduction using catalyzed permanganate

    Nature of the problemNon-aqueous phase liquids (NAPLs) and other hydrocarbon residuals can represent long-term sources of groundwater contaminants. Excavation and disposal often represent the most rapid and effective means of removing these source materials from the environment. However, such an approach is not always physically possible, hence in-situ source area management strategies are ...


  • Reactive core mat installed as NAPL control remedy at vermont superfund site case study

    Project: Pine Street Canal Superfund Site Location: Burlington, Vermont U.S.A. Products: Reactive Core Mat Organoclay Organic Adsorption Media Background: A manufactured gas plant operated at the Pine Street Canal site from 1895 to 1966. The plant disposed of wastes from the gasification process, including coal tars, which ...


    By CETCO

  • Sustainable soil remediation by refrigerated condensation at sites with `high-concentration` recalcitrant compounds and NAPL: two case studies

    Remediation of recalcitrant compounds at sites with high concentrations of volatile organic com- pounds (VOCs) or nonaqueous-phase liquids (NAPLs) can present significant technical and financial (long-term) risk for stakeholders. Until recently, however, sustainability has not been included as a significant factor to be considered in the feasibility and risk evaluation for remediation ...


    By EnviroLogek Technologies

  • Estimating the nonaqueous-phase liquid content in saturated sandy soil using amplitude domain reflectometry

    Groundwater contamination by nonaqueous-phase liquids (NAPLs) has become a serious environmental issue. Therefore, it is necessary to estimate the NAPL content (NAPL) in saturated soil to detect and monitor the NAPL contamination in groundwater. The objective of this study was to investigate three estimation methods for the NAPL in saturated sandy soil, namely, the noncalibration method (NCM), ...

  • Case study: Hunters Point

    In Situ Thermal Remediation with Gas Thermal Remediation (GTR©) is being used to remove NAPL contaminants from a former military base. The system is extracting nearly 1,000 liters of liquid waster every week. LNAPLs, such as fuel and oils, and DNAPLs, such as PCBs and chlorinated solvent, are being removed from the subsurface to make way for a residential homes. In Situ+NAPL ...

  • 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 ...

  • Properties and Behavior of Nonhalogenated VOC`s

    An important consideration when evaluating a remedy is whether the compound is nonhalogenated or halogenated. A nonhalogenated compound is one which does not have a halogen (e.g., fluorine, chlorine, bromine, or iodine) attached to it. The vendor of the technology being evaluated must be informed whether the compounds to be treated are nonhalogenated or halogenated. In most instances, the vendor ...

  • Nonaqueous Phase Liquids Compatibility with Materials Used in Well Construction, Sampling, and Remediation

    The EPA Regional Ground Water Forum is a group of EPA professionals representing Regional Superfund and Resource Conservation and Recovery Act Offices (RCRA), committed to the identification and resolution of ground-water issues impacting the remediation of Superfund and RCRA sites. The Forum is supported by and advises the Superfund Technical Support Project. The compatibility of remediation, ...


    By QED Environmental Systems

  • ERH & MPE remediation of DNAPL and LNAPL fort lewis superfund site, Washington

    As the prime contractor, TRS Group, Inc. (TRS) designed and operated Electrical Resistance Heating (ERH) systemsto treat three LNAPL/DNAPL source areas at the Ft. Lewis, East Gate Disposal Yard (EGDY) NPL site. Contaminants ofconcern in NAPL Areas 1, 2 and 3 included chlorinated solvents, primarily trichloroethene (TCE), and POLs (petroleum products, oil and lubricants). Based upon pre- and ...


    By TRS Group, Inc.

  • Properties and Behavior of Halogenated VOCs

    An important consideration when evaluating a remedy is whether the compound is halogenated or nonhalogenated. A halogenated compound is one onto which a halogen (e.g., fluorine, chlorine, bromine, or iodine) has been attached. The nature of the halogen bond and the halogen itself can significantly affect performance of a technology or require more extensive treatment than for nonhalogenated ...

  • Case study - EDRO in soil at petroleum tank farm site

    Environmental engineers needed quick and accurate screening analysis on a tank farm contaminated with a subsurface plume of fuel oil. Sitelab's EDRO test was performed to delineate the vertical extent of contamination. A drill rig was used to collect samples from the surface down to twenty feet at different locations throughout the property. They needed to quantify the size of the NAPL plume in ...


    By Sitelab Corporation

  • Pilot Project at Tidewater Terminals

    The pilot project was undertaken to determine the effectiveness of AgroRemed for cleanup of contaminated soil within a short turn around time as claimed by SARVA. The results were monitored on 10th day and 20th day before closing the pilot. It is seen from the results that there was a reduction of more than 30% in the values of TPH on 10th day and at the end of 20 days there was a reduction in ...


    By Sarva Bio Remed, LLC

  • Properties and Behavior of Nonhalogenated SVOCs

    Subsurface contamination by nonhalogenated SVOCs potentially exists in four phases: Gaseous phase: contaminants present as vapors in saturated zone. Solid phase: contaminants adsorbed or partitioned onto the soil or aquifer material in both saturated and unsaturated zones. Aqueous phase: contaminants dissolved into pore water according to their solubility in both saturated and ...

  • 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 ...

  • Grade `A` remediation - selective phase transfer technology cleans up college in Moncton, New Brunswick

    Remedialing sensitive areas or population dense areas can be tricky at the best of times. So it's important to utilize a remediation technology with a proven record of reducing environmental and health and safely risks in order to avoid associated legal liability for project stakeholders, among other reasons. Ivey International Inc. is a Canadian company with offices in Campbell River, B.C., ...


    By Ivey International Inc.

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