Science & Technology
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User’s Manual for the CO - Benefits Risk Assessment (COBRA) Screening Model
Use COBRA to estimate the impact of air pollution emission changes on ambient particulate matter (PM) air pollution concentrations.
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Estimating the Potential Toxicity of Chemicals Associated with Hydraulic Fracturing Operations Using Quantitative Structure-Activity Relationship Modeling
Researchers facilitated evaluation of chemicals that lack chronic oral toxicity values using a QSAR model to develop estimates of potential toxicity for chemicals used in HF fluids or found in flowback or produced water
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Case Studies for EPA’s Hydraulic Fracturing Study
Case Studies for EPA’s Hydraulic Fracturing Study
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Modeling of fault reactivation and induced seismicity during hydraulic fracturing of shale-gas reservoirs
Written by Rutqvist et al. Published in Journal of Petroleum Science and Engineering. July 2013.
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Gas Flow Tightly Coupled to Elastoplastic Geomechanics for Tight- and Shale-Gas Reservoirs: Material Failure and Enhanced Permeability
Jihoon Kim and George Moridis, Gas Flow Tightly Coupled to Elastoplastic Geomechanics for Tight and Shale Gas Reservoirs: Material Failure and Enhanced Permeability
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Development of the T+M coupled flow-geomechanical simulator to describe fracture propagation and coupled flow-thermal-geomechanical processes in tight/shale gas systems
Written by Jihoon Kim; George J. Moridis. Published in Computers and Geosciences,Accepted manuscript,doi:10.1016/j.cageo.2013.04.023
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Numerical analysis of fracture propagation during hydraulic fracturing operations in shale gas systems
Researchers used the TOUGH+ geomechanics computational software and simulation system to examine the likelihood of hydraulic fracture propagation (the spread of fractures) traveling long distances to connect with drinking water aquifers.
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Overview of Chronic Oral Toxicity Values for Chemicals Present in Hydraulic Fracturing Fluids, Flowback and Produced Waters
as part of EPA's Hydraulic Fracturing Drinking Water Assessment, EPA is summarizing existing toxicity data for chemicals reported to be used in hydraulic fracturing fluids and/or found in flowback or produced waters from hydraulically fractured wells
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ALOHA Software
Part of the CAMEO suite, ALOHA® is an atmospheric dispersion model used for evaluating releases of hazardous chemical vapors, including toxic gas clouds, fires, and explosions.
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Hazardous Air Pollutants' Fact Sheet Chemical Cross Reference
Hazardous Air Pollutants' Fact Sheet Chemical Cross Reference
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Health and Environmental Effects of Hazardous Air Pollutants
What are the health and environmental effects of hazardous air pollutants?
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Documentation for 2023 Reference Case
On this page you will find documentation about EPA’s Platform v6 assumptions, updates, changes, and enhancements, including the full support document as well as additional tables and attachments.
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Lower Building Energy Demands
Information and resources on how green infrastructure can help lower building energy demands.
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EPA Region 3 Data Validation
An overview of how Region 3 handles data validation. This includes a table illustrating how old validation levels correspond to the new levels.
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Predictive Models and Tools for Assessing Chemicals under the Toxic Substances Control Act (TSCA)
EPA has developed databases and predictive models to help evaluate the hazard, exposure, and risk of chemicals released to the environment and how workers, the general public, and the environment may be exposed to and affected by them.
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Guidance for Thyroid Assays in Pregnant Animals, Fetuses and Postnatal Animals, and Adult Animals
This study may be done in place of a rat DNT study for thyroid disrupting chemicals. This special study is intended to provide LOAEL or NOAEL to derive RfDs to be protective of thyroid development in pregnant women, fetuses or newborns.
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EPA Calls for Nominations of Peer Reviewers for Draft Risk Evaluation of the Solvent 1,1-DCA
EPA is calling for nominations of scientific experts to serve as letter peer reviewers of the Draft Risk Evaluation for 1,1-Dichloroethane (1,1-DCA). Nominations are due April 11, 2024.
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Final Risk Evaluation for C.I. Pigment Violet 29
PF for PV29
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Risk Evaluation for C.I. Pigment Violet 29
Documents for PV-29
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Acute Exposure Guideline Levels for Airborne Chemicals
Acute exposure guideline levels (AEGLs) describe the risk to humans from a once-in-a-life-time, or rare, exposure to airborne chemicals.