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HRS Toolbox
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The HRS Toolbox page provides current guidance documents that may be used
to determine if a site is a candidate for inclusion on the National Priorities
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| Some of the documents below are in PDF format. For information on PDF, please click on the "About PDF" icon.
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Guidance
for Performing Preliminary Assessments Under CERCLA
The Guidance for Performing Preliminary Assessments Under CERCLA is applicable to the most commonly encountered sites and site conditions. This document provides guidelines and instruction on PA evaluation, scoring, and the use of standard PA scoresheets.
Guidance
for Performing Site Inspections Under CERCLA
The Guidance for Performing Site Inspections Under CERCLA is applicable to the most commonly encountered sites and site conditions. This guidance discusses how to review and evaluate available information, plan an effective sampling strategy to acquire analytical data to evaluate a site according to the HRS, and prepare required reports and work products.
The Hazard Ranking System Guidance Manual provides general and technical guidance for individuals involved in determining HRS scores and preparing HRS scoring packages. The manual clarifies terms and concepts in the HRS, presents strategies and specific guidance for scoring selected HRS factors, and provides guidelines to assist in collecting and organizing relevant data.
For more information on HRS Acronyms and Terms, access the Glossary of HRS Acronyms and Terms (A-L) and
Glossary of HRS Acronyms and Terms (M-Z).
This revision to the Hazard Ranking System (HRS) was published in the Federal Register (Volume 55, Number 241) on Friday, December 14, 1990.
This collection of fact sheets provides a quick reference guide for HRS scoring and site assessment investigations. The fact sheets were published from November 1990 to April 2000.
The HRS Scoring and Documentation Tools collection currently contains the NPL Characteristics Data Collection Form
and the Superfund Chemical Data Matrix (SCDM).
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HRS Rule, December 14, 1990