Data and Tools
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Section 9: Ground Water - Likelihood of Release
Learn how EPA evaluates an identified aquifer's likelihood of release factor category for the purpose of scoring the ground water pathway.
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Section 8: Ground Water - Aquifers
Learn about issues surrounding aquifers, the basic unit of evaluation in the HRS ground water pathway.
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Section 7: Targets
Learn about targets, the third factor category in the HRS pathway score equation. Targets are the people, resources, or sensitive environments that could be affected by the site.
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Section 6: Likelihood of Release
Learn about the likelihood of Release (LR) factor category, which is evaluated based on the factors of observed release and potential to release.
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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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Webinar - EPA’s Latest Significant New Alternative Policy (SNAP) Program Rule
Presenters from DC Engineering and Refrigerant Management Solutions provided an overview of the impacts and changes end-users can expect during the transition to lower GWP refrigerants. View the full presentation in the linked YouTube video.
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Staff Manuals
Staff manuals.
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Administrative Opinions
Final opinions, including concurring and dissenting opinions, as well as orders, made in the adjudication of cases.
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USS Lead Map Zones 1, 2 and 3
Maps of the different zones in OU1 of the USS Lead Superfund Site.
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Soil Sampling Data for West Calumet Housing Complex
Results of Lead and Arsenic Testing at West Calumet Housing Complex, East Chicago, Ind.
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Ventilation Checklist from Indoor Air Quality Tools for Schools
Ventilation IAQ Checklist
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Maintain Portable Classrooms, Part of Indoor Air Quality Design Tools for Schools
Portable, or relocatable classrooms have been a feature of many school districts for years.
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Chemical Manufacturing
Chemical manufacturing overview and facility map for the 2022 Toxics Release Inventory National Analysis
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AQS Tech Note POC 6-28-13
AQS Tech Note POC 6-28-13
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Buffalo River AOC Boundary Map
This page presents various boundary maps of the Buffalo River AOC.
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Kalamazoo River AOC Boundary Map
This page presents various maps of the Kalamazoo River AOC.