Science & Technology
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Section 5: Waste Characteristics
Learn about the calculation process for substance-specific factors, the chemical characteristics of the hazardous substances found at a site that are available to migrate from the site sources.
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Section 4: Source Characterization
Learn about source characterization for Superfund sites. Although the Hazard Ranking System (HRS) is designed to score releases and sites, sources and areas of observed contamination play a crucial role in determining HRS pathway scores.
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Section 3: HRS Structure
Read about the the four pathways for evaluating a Hazard Ranking System (HRS) score: ground water migration, surface water migration, soil exposure, and air migration.
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Section 2: Site Assessment Process
Learn about the multi-step process leading to the final National Priorities List (NPL) listing decision, which begins when a site is discovered and listed in CERCLIS.
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Section 1: Regulatory Context of the HRS
Learn about the regulatory context of the Hazard Ranking System (HRS), the primary tool that EPA uses to place sites on the National Priorities List (NPL).
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Nitrogen Dioxide (NO2) and Sulfur Dioxide (SO2) Secondary Air Quality Standards
The Clean Air Act requires EPA to set national ambient air quality standards (NAAQS) for six pollutants considered harmful to public health and the environment
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Nitrogen Dioxide (NO2) Primary Air Quality Standards
The Clean Air Act requires EPA to set national ambient air quality standards (NAAQS) for six pollutants considered harmful to public health and the environment
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Carbon Monoxide (CO) Air Quality Standards
The Clean Air Act requires EPA to set national ambient air quality standards (NAAQS) for six pollutants considered harmful to public health and the environment
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WATERS GeoViewer
This landing page provides information about the EPA GeoPlatform hosted WATERS GeoViewer.
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Market Characterizations
market characterizations for 5 AIM Act applications
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Region 7 – Fact Sheet Archive
Outreach informational documents covering various topics
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EPA Region 6 Mobile Laboratory
The EPA Region 6 Mobile Laboratory is ready for field use in case of emergencies or routine analysis.The Mobile Laboratory was used during Hurricane Katrina response.
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Testing Chemical Warfare Agent Response in a Realistic Setting
EPA's ORD offers free public webinars on recent research results. Watch a pre-recorded webinar on the Operational Test and Evaluation of Chemical Remediation Activities (OTECRA) full-scale field study.
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SW-846 Test Method 9035: Sulfate (Colorimetric, Automated, Chloranilate)
automated method applicable to ground water, drinking and surface waters, and domestic and industrial wastes containing 10 to 400 mg sulfate / liter
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SW-846 Test Method 9012B: Total and Amenable Cyanide (Automated Colorimetric, With Off-Line Distillation)
method used to determine the concentration of inorganic cyanides that are present as either soluble salts or complexes in wastes or leachate
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SW-846 Test Method 9010C: Total and Amenable Cyanide: Distillation
method to extract soluble cyanide salts and many insoluble cyanide complexes from wastes and leachates, designed to address the problem of ""trace"" analyses
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SW-846 Test Method 5021A: Volatile Organic Compounds (VOCs) in Various Sample Matrices Using Equilibrium Headspace Analysis
describes general purpose method for the preparation of VOCs in soils/sediments and solid wastes for determination by GC or GC/MS
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SW-846 Test Method 1340: In Vitro Bioaccessibility Assay for Lead in Soil
Describes assay procedures written on the assumption that they will be performed by analysts who are formally trained in at least the basic principles of chemical analysis and in the use of the subject technology.
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Individual Waste Reduction Model (iWARM) Tool
This page provides a summary of EPA’s Individual Waste Reduction Model (iWARM). The page includes a brief description of the tool and a link to the Excel version of iWARM and the iWARM Widget.
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Electric Vehicle Myths
Facts and myths about electric vehicles.