| Vapor Intrusion Pathway Assessment: State-of-the-Practice and Opportunities for v3.0 |
Dec 2010 |
29 pages |
| Authors:
Paul C Johnson; Ira A Fulton; ARIZONA STATE UNIV TEMPE SCHOOL OF ENGINEERING
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 | Guidance for assessing the soil vapor-to-indoor air exposure pathway continues to evolve with documents being drafted by regulatory agencies, industry, and industry-regulatory collaborations. While variable across the federal, state, and local levels, guidance is converging toward a multiple-lines-of-evidence-based paradigm that involves combinations of indoor air sub-slab soil gas, deeper soil gas, groundwater, and soil sampling in addition to screening-level modeling. There are concerns about implementing this type of guidance due ... |
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| Air Sparging Design Paradigm |
12 Aug 2002 |
151 pages |
| Authors:
Andrea Leeson; Paul C Johnson; Richard L Johnson; Catherine M Vogel; Robert E Hinchee; Michael Marley; Tom Peargin; Cristin L Bruce; Illa L Amerson; Christopher T Coonfare; Rick D Gillespie; David B McWhorter; BATTELLE COLUMBUS OH
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| Air sparging generally involves the injection of air into an aquifer through vertical or horizontal wells. In situations where contaminant vapor recovery is necessary (e.g., as required by regulation, or in situations where vapor migration could cause adverse impacts), air sparging systems are coupled with soil vapor extraction (SVE) systems. Historically, practitioners have installed air sparging systems to: (1) treat immiscible contaminant source zones at or below the capillary fringe; ... |
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| Prediction of Groundwater Quality Improvement Down-Gradient of In Situ Permeable Treatment Barriers and Fully-Remediated Source Zones. ESTCP Cost and Performance Report |
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40 pages |
| Authors:
Paul C Johnson; Pamela M Carlson; Paul Dahlen; ARIZONA STATE UNIV TEMPE COLL OF ENGINEERING AND APPLIED SCIENCES
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| In situ permeable treatment barriers (PTB) are designed so that contaminated groundwater flows through an engineered treatment zone within which contaminants are eliminated or the concentrations are significantly reduced. These systems are often considered for the containment of dissolved groundwater contaminant plumes or for controlling the discharge and larger scale impact of dissolved contaminants from source zones to aquifers. The performance of a PTB is typically judged by short-term changes ... |
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