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Records 1 to 25 of 81844 records

Field Study of Soil Vapor Extraction for Reducing Off‐Site Vapor Intrusion
(JOURNAL) [Published : Feb 11, 2020]
Soil vapor extraction (SVE) is effective for removing volatile organic compound (VOC) mass from the vadose zone and reducing the potential for vapor intrusion (VI) into overlying and surrounding buildings. However, the relationship between residual mass in the subsurface and VI i...
Factors controlling surface ozone in the Seoul Metropolitan Area During the Korus AQ campaign
(JOURNAL) [Published : Aug 25, 2020]
To understand the characteristics of air quality in the Seoul Metropolitan Area (SMA), intensive measurements were conducted under the KORea-United States Air Quality (KORUS-AQ) campaign. Trace gases such as O3, NOx, NOy, SO2, CO, and VOC (volatile organic compounds), photochemic...
The risks of using molecular biodiversity data for incidental detection of species of concern
(JOURNAL) [Published : Aug 13, 2020]
Incidental detection of species of concern (e.g., invasive species, pathogens, threatened and endangered species) during biodiversity assessments based on high‐throughput DNA sequencing holds significant risks in the absence of rigorous, fit‐for‐purpose data qua...
The Impact of School Location and Commuting Choice on Children’s Air Pollution Exposures
(JOURNAL) [Published : Jul 07, 2020]
Problem, Research Strategy, Findings: The impact of school location on children’s air pollution exposure and their ability to walk and bike to school is a growing policy issue. As states consider laws to minimize exposure to air pollution, there is concern that such policie...
A Cumulative Risk Perspective for Occupational Health and Safety (OHS) Professionals
(JOURNAL) [Published : Aug 31, 2020]
Cumulative risk assessment (CRA) addresses the combined risk associated with chemical and non-chemical exposures. Although CRA approaches are utilized in environmental and ecological contexts, they are rarely applied in workplaces. In this Perspectives article, we strive to rais...
A Perspective on the Role of Uncertainty in Sustainability Science and Engineering
(JOURNAL) [To be published : Jan 01, 2021]
The Trans-Atlantic Research and Development Interchange on Sustainability Workshop (TARDIS) is a meeting on scientific topics related to sustainability. The 2019 workshop theme was "On the Role of Uncertainty in Managing the Earth for Global Sustainability." This paper ...
Studying Scale Dependency of Aerosol Cloud Interactions using Scale-Aware Cloud Formulations
(JOURNAL) [Published : Sep 09, 2020]
The WRF-ACI model (documented in Part-I) is used to investigate the scale dependency of aerosol-cloud interactions (ACI) across the “grey zone” scales for grid scale and subgrid scale clouds. The impacts of ACI are examined across regions in the eastern and western U....
Evaluating mobile monitoring of on-road emission factors by comparing concurrent PEMS measurements
(JOURNAL) [Published : Sep 20, 2020]
Many countries have adopted portable emissions measurement system (PEMS) testing in their latest regulations to measure real-world vehicular emissions. However, its fleetwide implementation is severely limited by the high equipment costs and lengthy setup procedures, posing a nee...
Identifying Air Pollution Source Impacts in Urban Communities Using Mobile Monitoring
(JOURNAL) [Published : May 01, 2020]
With increasing population, rapid urbanization and increased migration to cities, the local impacts of increasing transportation and industrial-related air pollution are of growing concern worldwide. Elevated air pollution concentrations near these types of sources have been link...
Peer Review and Supporting Literature Review of Air Sensor Technology Performance Targets: 2019 Supplemental
(PUBLISHED REPORT) [Published : May 01, 2020]
This is a followup suppliemental literature review of air sensors that covers the period from 2017 to 2019. It will be used to support development of perormance targets for air sensors.
Systematic Review Protocol for the PFAS IRIS Assessment
(IRIS ASSESSMENT) [Published : May 24, 2019]
The protocol presents the methods for conducting the systematic reviews and dose-response analyses for development of a draft IRIS assessment for five per- and polyfluoroalkyl substances (PFAS) assessments including: perfluorodecanoic acid (PFDA; CASRN 335-76-2), perfluorononano...
SARS CoV-2 Wastewater Monitoring: Linking Research and Application To Meet Immediate Needs
(PRESENTATION) [Presented : Aug 04, 2020]
In recent weeks, EPA-ORD has been both assessing analytical methods and developing a sampling framework for monitoring SARS-CoV-2, the virus which causes COVID-19, in wastewater. The talk outlines our current activities future plans, focusing on better understanding the method pe...
PFAS Toxprints: A Hierarchical Structure-Based Categorization Method for Characterization of Per- and Polyfluoroalkyl Substances
(PRESENTATION) [Presented : Aug 20, 2020]
Per- and polyfluoroalkyl substances (PFAS) are of high public interest due to widespread production, environmental persistence, and adverse ecological and health impacts. Recently, both the OECD and the EPA’s Comptox Chemicals Dashboard have published extensive lists of ove...
Monitoring of Nitrification in Chloraminated Drinking Water Distribution Systems With Microbiome Bioindicators Using Supervised Machine Learning
(JOURNAL) [Published : Sep 16, 2020]
Many water utilities in the US using chloramine as disinfectant treatment in their distribution systems have experienced nitrification episodes, which detrimentally impact the water quality. A chloraminated drinking water distribution system (DWDS) simulator was operated through...
EPANET: An Introduction and Example Applications
(PRESENTATION) [Presented : Sep 02, 2020]
What is EPANET? • Not an acronym! • Computer program (Microsoft Windows desktop or laptop software application) • Graphical user interface • Command line & Toolkit versions • Used for modeling and analyzing a water distribution system • Input is ...
Classifying Streamflow Duration: The Scientific Basis and an Operational Framework for Method Development
(JOURNAL) [Published : Sep 11, 2020]
Streamflow duration is used to differentiate reaches into discrete classes (e.g., perennial, intermittent, and ephemeral) for water resource management. Because the depiction of the extent and flow duration of streams via existing maps, remote sensing, and gauging is constrained,...
WMOST v 3.01 and v 3.1 Training Workshop (Sessions 1-9)
(PRESENTATION) [Presented : Aug 20, 2020]
The EPA's Watershed Management Optimization Support Tool (WMOST) is designed to facilitate integrated water management among communities, utilities, watershed organizations, consultants, and others. WMOST identifies the most cost-effective suite of management practices to meet us...
WMOST v3 Case Study: Cabin John Creek, Maryland
(PUBLISHED REPORT) [Published : Dec 01, 2019]
A case study application of EPA’s Watershed Management Optimization Support Tool (WMOST v3) was carried out to inform management options for the heavily urbanized watershed of Cabin John Creek (CJC), MD, a tributary to the Potomac River, for the 10-year period 2014 - 2025. CJC w...
Modeled Impacts of Drinking Water Pb Reduction Scenarios on Children’s Exposures and Blood Lead Levels
(JOURNAL) [Published : Aug 04, 2020]
In recent years, environmental lead (Pb) exposure through drinking water has resulted in community public health concerns, particularly in children. To understand potential impacts on childhood blood Pb levels (BLLs) from various drinking water Pb reduction scenarios (i.e. lead s...
Streamlining Documentation of Sampling and Analysis Plans for Biological Contamination Events
(PRESENTATION) [Presented : Sep 15, 2020]
This presentation will be presented at the Virtual Biological Sampling Design and Implementation Workshop being held September 15, 2020. The presentation discusses development and the purpose of Sampling and Analysis plans (SAPs) that are to be developed as part of sampling and a...
EPANET 2.2 User Manual
(PUBLISHED REPORT) [Published : May 20, 2020]
Updated User's Manual for EPANET
Contribution of Particulate Nitrate Photolysis to Heterogeneous Sulfate Formation for Winter Haze in China
(JOURNAL) [Published : Sep 08, 2020]
Nitrate and sulfate are two key components of airborne particulate matter (PM). While multiple formation mechanisms have been proposed for sulfate, current air quality models commonly underestimate its concentrations and mass fractions during northern China winter haze events. On...
Method 559: Determination of Nonylphenol and 4-tert-Octylphenol in Drinking Water by Solid Phase Extraction and Liquid Chromatography/Tandem Mass Spectrometry (LC/MS/MS)
(PUBLISHED REPORT) [Published : Sep 10, 2020]
Method 559 is an accurate and precise analytical method to determine nonylphenol and 4-tert-octylphenol in drinking water using solid phase extraction and liquid chromatography tandem mass spectrometry (SPE-LC/MS/MS). This method development task establishes sample preservation t...
Biological Treatment and Nitrate
(PRESENTATION) [Presented : Sep 03, 2020]
This study addresses the removal of nitrate, a regulated contaminant, from drinking water. Two pilot reactors for biological nitrate removal were operated in the lab. One is an innovative bubble column reactor and the other is a fixed bed reactor. Both are capable of achieving co...
AdDesignS: Modeling Drinking Water Treatment with Granular Activated Carbon
(PRESENTATION) [Presented : Sep 03, 2020]
This presentation is designed to accompany a technical training session that discusses AdDesignS software. This presents some basic screen captures of the key steps in using AdDesignS to model GAC water treatment. This would be valuable to anyone attending the technical training,...