soil screen Articles
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A possible sanitary risk analysis approach for contaminated sites: fundamentals, computer worksheet implementation, preliminary application
Within the increasing (legislative and applicative) attention to absolute risk analysis for contaminated sites at Italian level, as a University research study and exercise, the definable 'ARA-CoSSSLs' absolute risk analysis approach for human health protection ('Absolute Risk Analysis for Contaminated Sites', on 'Soil Screening Levels' basis) has been derived (as an initial, simplified version) ...
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Recommendations to improve wildlife exposure estimation for development of soil screening and cleanup values
An integral component in the development of media‐specific values for the ecological risk assessment of chemicals is the derivation of safe levels of exposure for wildlife. Though the derivation and subsequent application of these values can be used for screening purposes, there is a need to identify the threshold for effects when making remedial decisions during site‐specific assessments. ...
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Soil properties affect the toxicities of TNT and RDX to the enchytraeid worm, Enchytraeus crypticus
We investigated individual toxicities of 2,4,6‐trinitrotoluene (TNT) and hexahydro‐1,3,5‐trinitro‐1,3,5‐triazine (RDX) to the potworm Enchytraeus crypticus using the Enchytraeid Reproduction Test. Studies were designed to generate ecotoxicological benchmarks that can be used for developing the ecological soil screening levels for ecological risk assessments of contaminated soils, and to ...
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Deriving site‐specific clean‐up criteria to protect ecological receptors (plants and soil invertebrates) exposed to metal or metalloid soil contaminants via the direct contact exposure pathway
Soil contaminant concentration limits for the protection of terrestrial plants and soil invertebrates are commonly based on thresholds derived using data from laboratory ecotoxicity tests. A comprehensive assessment has been made for the derivation of Ecological Soil Screening Levels (Eco‐SSL) in the United States of America (USA); however, these limits are conservative because of their focus ...
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Dehalogenation
Introduction: Contaminated soil is screened, processed with a crusher and pug mill, and mixed with reagents. The mixture is heated in a reactor. The dehalogenation process is achieved by either the replacement of the halogen molecules or the decomposition and partial volatilization of the contaminants. Base-catalyzed Decomposition (BCD) Base-catalyzed decomposition (BCD) process was developed ...
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Are your field soil screening procedures providing you with practical and accurate information?
Untitled Document Environmental consulting activities frequently require that on-the-spot decisions be made in the field concerning the presence or absence of volatile, or even semi-volatile, organic compounds (VOC's) in soil. There is nothing that can replace the value of field experience in 'making the right call' when the trucks are lined up, the backhoe operator is waiting, ...
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Comparison of extractability of Cd, Cu, Pb and Zn with sequential extraction in contaminated and non-contaminated soils
Various extraction procedures were employed for measuring extractable concentrations of potential toxic elements in soil. The extractability of Cd, Cu, Pb and Zn in four contaminated and four non-contaminated soils of Japan, was compared by single extraction (CaCl2, DTPA, NH4Cl, 0.1 M HCl and 1 M HCl ) and sequential extraction procedures [(six operationally defined chemical phases, viz. water ...
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Deriving site‐specific soil clean‐up values for metals and metalloids: Rationale for including protection of soil microbial processes
Although it is widely recognized that microorganisms are essential for sustaining soil fertility, structure, nutrient cycling, groundwater purification and other soil functions, soil microbial toxicity data were excluded from the derivation of Ecological Soil Screening Levels (Eco‐SSL) in the United States. Among the reasons for such exclusion were claims that microbial toxicity tests were too ...
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Validation of a New Method for Screening Soil and Water for TCE Contamination
INTRODUCTION ASTM Method D 7203-06, Standard Test Method for Screening Trichloroethylene (TCE)-Contaminated Media Using a Heated Diode Sensor, (ASTM 2006) can be used to screen a sample of soil or water known to contain the halogenated volatile organic compound (HVOC) TCE. The method calls for measuring the TCE concentration in the headspace above the sample using a heated diode sensor ...
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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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Fighting soil contamination with XRF
Soil contamination Complying with new environmental regulations is a fast growing concern for companies and local officials tasked with ensuring that industries reduce pollution and clean up after themselves. It’s a particularly challenging issue when it comes to soil contamination It’s not always easy to detect as it silently contaminates crops and the ground water supply. XRF ...
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Analytical model for uni–directional flow passive soil vapour extraction system
An analytical one–dimensional model has been developed to examine the uni–directional barometric pumping in passive Soil Vapour Extraction (SVE) system. The model is applicable to a special case in which a radial flow field is insignificant. The system considered contains two unsaturated zone layers, an upper contaminated low permeability layer and a lower high permeability layer contains a well ...
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Innovations in Site Characterization. Case Study: Hanscom Air Force Base, Operable Unit 1 (Sites 1, 2, and 3)
Executive Summary Field analytical instrumentation and methods were used to support a site characterization study at the Airfield at Hanscom Air Force Base (HAFB) Operable Unit 1. HAFB is located in Middlesex County, Massachusetts, and occupies land in the towns of Bedford, Concord, Lexington, and Lincoln. U.S. Air Force military operations began in 1941 and continued through 1973. With the ...
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Gasoline, jet and diesel fuel soils contaminated - Petroleum product storage terminal
LOCATION: Tiverton, Rhode IslandPROJECT DATE: April, 1993 to PresentCLIENT: Confidential BACKGROUND: Soils at this 106 acre former petroleum product storage terminal have been impacted with gasoline, jet fuel, and diesel fuel over the course of 50 years. Estimates of the impacted soils range from 200,000 to 400,000 cubic yards. ACTION TAKEN: Ex-situ bioremediation is being used as the ...
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Common Treatment Technologies for Inorganics in Soil, Sediment, and Sludge
The most commonly used treatment technologies for inorganics in soil, sediment, and sludge include solidification/stabilization (S/S), excavation and off-site disposal, and acid extraction. These treatment technologies are described briefly below. Solidification processes produce monolithic blocks of waste with high structural integrity. The contaminants do not necessarily interact chemically ...
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Thermals Put the Heat on Dig-and-Dump - Case Study
The UK has little experience of thermal treatment. Now one contractor is determined to open our eyes to enhanced thermal conduction technology, writes Marcus Gibson. The USA has long been enthusiastic about thermal treatment technologies, but the UK has mostly shunned them - unconvinced of their merits. Paul Theile, managing director of MEL, has linked up with RH Consultants in the UK and the US ...
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Cost-Effective Destruction of Petroleum Hydrocarbon Contaminants with Expedited Residual Mass Solubilization under Anaerobic Conditions via Biostimulation
Proof-of-Concept study evaluating efficacy of biostimulation additive TPHenhanced to 1) enhance respiration of indigenous heterotrophic bacteria; 2) expedite solubilization of residual source mass (LNAPL), and 3) enhanced destruction of dissolved-phase petroleum hydrocarbons (PHC) under anaerobic conditions. Site an abandoned upstream oil-gas facility. Saturated-soils/groundwater proximate to ...
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TPHenhanced Proof-of-Concept Rankin July 31 2018
Proof-of-Concept study performed to evaluate efficacy of biostimulation additive TPHenhanced to enhance native heterotrophic bacteria populations ability to degrade petroleum hydrocarbon contaminants (PHCs) under anaerobic conditions. Purpose to identify low-impact low-cost strategy to remediate remote/legacy PHC impacted sites without Oxygen (O2) and/or above ground support equipment. The Site ...
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Crude Oil in Soil
For many good reasons are there in the moment high focus on cleaning up soil do to varies contamination over the years from example oil production or wars. One of the major cleaning projects is on the way in Kuwait, caused by the oil well fires happened during the Iraq war I 1991. Photos from the U.S. Space Shuttles (nasa.gov), show oil wells set on fire along the Persian Gulf in June 1991. ...
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Thermal Desorption
Untitled Document Introduction: Thermal desorption is a physical separation process and is not designed to destroy organics. Wastes are heated to volatilize water and organic contaminants. A carrier gas or vacuum system transports volatilized water and organics to the gas treatment system. The bed temperatures and residence times designed into these systems will volatilize ...
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