Science Inventory

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The focus of this report is on North American wet deposition temporal patterns from 1979 to 1987 and spatial patterns for 1987. he report investigates the patterns of annual precipitation-weighted average concentration and annual deposition for nine ion species: hydrogen, sulfate...

<B>Resource Purpose:</B>Originally developed to support Phase I regulation for use or disposal of biosolids (sewage sludge). Data collected were used to estimate risks, potential regulatory limits, and the cost of regulation. This is currently the only statistically designed surv...

The Superfund Amendments and Reauthorization Act of 1986 (SARA) directed the U.S. Environmental Protection AGency (EPA) to establish an Alternative/Innovative Treatment Technology Research and Demonstration Program. The EPA's Office of Solid Waste and Emergency Response and the ...

There are two classes of statistical issues: firm issues amenable to problem statement and technical resolution and soft issues that have qualitative dimensions and ideological implications. irm issues are easy: defining and stating the problem is much of the solution. he soft is...

The objectives of this study were to install, test and demonstrate two automated gas chromatographic (GC) systems to state and regional EPA groups. he two GC systems required no liquid cryogen for operational purposes. he Dynatherm/Hewlett Packard GC system was designed for the m...

The Emerging Technology Program (ETP), part of the U.S. EPA's Superfund Innovative Technology Evaluation (SITE) Program, is continuing to create an environment where technical innovation can accelerate into field and commercial applications for treatment of hazardous waste sites....

The Emerging Technology Program (ETP), part of the U.S. EPA`s Superfund Innovative Technology Evaluation (SITE) Program, is continuing to create an environment where technical innovation can accelerate into field and commercial applications for treatment of hazardous waste sites....

As research on smaller treatment devices grows, interest is also growing on how POU/POE can fit into a utility's overall strategy of providing safe and affordable water to customers in community and non-community transient and non-transient systems of all sizes. The EPA has been ...

The SVNR initiative involves the determination of a compliance rate for the foundry sector in EPA Region 4. A compliance rate is an estimate of the percentage of all the facilities in a population in compliance. The actual rate could be determined if all facilities were inspect...

Peer Review Plan 2007 STAA Review by SAB

Innovation in the water sector is unanimously viewed as critical to meeting water challenges that will emerge in the 21st century. However, a large number of open questions remain around the speed at which innovation must occur, where financing of development will come from, and ...

International concern about contaminated sediments is increasing as sustainable practices are needed to maintain water resources and waterways as important economic, commercial, recreational, and community resources. Sediments often serve as long-term sinks for legacy pollutants,...

The purpose of this manuscript is to summarize information regarding emerging low cost sensors technology and related presentations at the EPA 2013 Air Sensors workshop.

Sharing the latest state-of-the-science and integrating technological advances helps to foster success in the cleanup of hazardous waste sites. This information also helps to inform and improve the decision-making process at Comprehensive Environmental Response, Compensation, and...

U.S. EPA&rsquo;s Center for Computational Toxicology and Exposure provides tools to rapidly generate quantitative toxicity, human exposure, and internal dose estimates. The SEEM (Systematic Empirical Evaluation of Models) meta-modeling approach uses forward-backward inference to ...

In 2020 the Environmental Protection Agency (EPA) and U.S. Forest Service (USFS) jointly developed a pilot project that significantly revamped the Fire and Smoke Map available through the EPA&rsquo;s AirNow website. A nationwide correction was developed by ORD so that sensors cou...

Outline of Presentation: Basic concepts in gas metrology Regulatory requirements for calibration gases Historical background of EPA protocol Reference standards for protocol assays Types of EPA Protocol Gases Accuracy of EPA Protocol Gases Status of NO2 EPA Protocol Gases

The webinar focused on ways that ToxCast high throughput screening data and the adverse outcome pathway framework, under development in the CSS program, can be used to prioritize environmental contaminants for monitoring and management.

Diffusive sampling of a mixture of 42 volatile organic compounds (VOCs) in humidified, purified air onto the solid adsorbent Carbopack X was evaluated under controlled laboratory conditions. The evaluation included variations in sample air temperature, relative humidity, and ozon...

The University of Rhode Island&rsquo;s Watershed Watch Volunteer Monitoring Program has been collecting water quality data on dozens of Rhode Island lakes and ponds for over 25 years, allowing exploration of long-term trends in common water quality parameters. Not all lakes and p...

The University of Rhode Island&rsquo;s Watershed Watch Volunteer Monitoring Program has been collecting water quality data on dozens of Rhode Island lakes and ponds for over 25 years, allowing exploration of long-term trends in common water quality parameters. Not all lakes and p...

The University of Rhode Island&rsquo;s Watershed Watch Volunteer Monitoring Program has been collecting water quality data on dozens of Rhode Island lakes and ponds for over 25 years, allowing exploration of long-term trends in common water quality parameters. Not all lakes and p...

Modification of tyrosine by reactive chlorine can produce both 3-chlorotyrosine (CY) and 3,5-dichlorotyrosine (dCY). Both of these amino acids have proven to be promising biomarkers for assessing the extent of myeloperoxidase-catalyzed chlorine stress in a number of adverse physi...

The EPA spends millions of dollars as part of its 319 program to help address state and local nonpoint source problems. States receiving grants report their annual progress in the Grants Reporting and Tracking System (GRTS). Using GRTS, we test if implementation of Best Managemen...

Biofilm formation in drinking water distribution systems has been associated with water quality degradation and may result in non-compliance with existing regulations. United States water utilities report biofilm survival and regrowth despite disinfectant presence, and systems t...