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Alphabetical List of Documents

A B C D E F G H I J K L M N O P Q R S T U V W X Y Z

A

Approach for Addressing Dioxin in Soil and CERCLA and RCRA Sites (PDF) (6 pp, 24 kb, About PDF) OSWER Directive 9200.4-26, April 13, 1998
The purpose of this document is to recommend preliminary remediation goals (PRGs), or starting points for cleaning up dioxin in soil.

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B

Benchmark Dose Technical Support Document External Review Draft (PDF) (96 pp, 812 kb, About PDF), NCEA-F-0000, October 2000. Risk Assessment Forum, Washington, DC
The purpose of this document is to provide guidance for the Agency and the outside community on the application of the benchmark dose approach to determining the point of departure (POD) for linear or nonlinear extrapolation of health effects data.

Briefing the BTAG: Initial Description of Setting, History and Ecology of a Site (PDF) (11 pp, 289 kb, About PDF)
Eco Update (August, 1992)
This EcoUpdate bulletin focuses on the first meeting between a Remedial Project Manager and the Biological Technical Assistance Group, during which there is an initial exchange of information and guidance.

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C

Clarification of the Role of ARARs in Establishing Preliminary Remedial Goals under CERCLA (PDF) (4 pp, 412 kb, About PDF) August 22, 1997
This memorandum clarifies the relationship between the two key remedy selection mandates of the Comprehensive Environmental Response, Compensation and Liability Act (CERCLA) as amended by the Superfund Amendments and Reauthorization Act of 1986 (SARA).

Clarification to the 1994 Revised Interim Soil Lead Guidance for CERCLA Sites and RCRA Corrective Action Facilities (PDF) (16 pp, 132 kb, About PDF) 1998, OSWER Directive 9200.4-27, EPA/540/F-98/030 PB98-963244, OSWER Directive # 9200.4-27P.
This document provides an approach for determining protective levels of lead in soil, including recommended screening levels, how to develop preliminary remediation goals, and a description of a clean-up plan for CERCLA (Superfund) and RCRA sites with multiple sources of lead.

A Community Guide to Superfund Risk Assessment (December, 1999)

A Community Guide to Superfund Risk Assessment, Spanish Version (December, 1999)

Cumulative Risk Assessment Guidance-Phase I Planning and Scoping
Guidance on Cumulative Risk Assessment. Part 1. Planning and Scoping
First link is to memo directing use of this guidance and second link is directly to the guidance. This guidance directs each office to take into account cumulative risk issues in scoping and planning major risk assessments and to consider a broader scope that integrates multiple sources, effects, pathways, stressors and populations for cumulative risk analyses in all cases for which relevant data are available.

List of Drinking Water Contaminants & MCLs: National Primary Drinking Water Regulations
List of regulated contaminants with links for more details.

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D

Developing a Scope of Work for Ecological Assessments (PDF) (13 pp, 100 kb, About PDF) ( Eco Update, May 1992
This EcoUpdate bulletin helps Remedial Project Managers to plan and manage ecological assessments as part of the Remedial Investigation/Feasibility process.

Distribution of OSWER of Radionuclide Preliminary Remediation Goals (PRGs) for Superfund Electronic Calculator (PDF) (4 pp, 100 kb, About PDF)

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E

Ecological Assessment of Superfund Sites: An Overview (PDF) (8 pp, 67 kb, About PDF) Eco Update, December 1991
This EcoUpdate bulletin describes the components of the ecological risk assessment process and how they fit into the Remedial Investigation/Feasibility Study process.

Ecological Risk Assessment and Risk Management Principles for Superfund Sites, (Issuance of Final Guidance) (PDF) (9 pp, 1 mb, About PDF)
Guidance intended to help Superfund project managers to make ecological assessment decisions that are consistent across the United States and are transparent to the public.

Ecological Risk Assessment Guidance for Superfund: Process for Designing and Conducting Ecological Risk Assessments - Interim Final June 1997, EPA 540-R-97-006
This document provides guidance on how to design and conduct consistent and technically defensible ecological risk assessments for the Superfund program.

Ecological Significance and Selection of Candidate Assessment Endpoints 1996

ECO Update Bulletin Series
EcoUpdates are a series of bulletins which provide information on various aspects of Ecological Risk Assessments, including toxicity testing, the role of the Biological Technical Assistance Group (BTAG), field studies, and screening level risk assessments.

Environmental Protection Agency (EPA) Risk Characterization Program (1995)

Establishment of Cleanup Levels for CERCLA Sites with Radioactive Contamination (PDF) (20 pp, 1.12 mb, About PDF) August 22, 1997
This memorandum presents clarifying guidance for establishing protective cleanup levels for radioactive contamination at Comprehensive Environmental Response, Compensation, and Liability Act of 1980 (CERCLA) sites.

Evaluation of Facilities Currently or Previously Licensed NRC Sites under CERCLA, (Interim Final) (PDF) (9 pp, 1 mb, About PDF) February 17, 2000 (listed under OSWER Radiation Guidance)

Expedited Site Assessment Tools for Underground Storage Tank Sites: A Guide for Regulators EPA 510-B-97-001, March 1997
The expedited site assessment (ESA) process is a framework for rapidly characterizing UST site conditions for corrective action decisions. This concept has been described with other names including: accelerated site characterization, rapid site characterization, and expedited site investigation.

Exposure Factor Handbook
The Handbook provides a summary of the available statistical data on various factors used in assessing human exposure.

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G

Guidance for Data Useability in Risk Assessment (Part A) April 1992
Guidance for Data Useability in Risk Assessment, Part A, is designed to provide data users with a nationally consistent basis for making decisions about the minimum quality and quantity of environmental analytical data that are sufficient to support Superfund risk assessment decisions, regardless of which parties conduct the investigation. Part B of this guidance addresses radioanalytical issues.

Guidance for Data Useability in Risk Assessment (Part B), May 1992
This document is the second part of the two-part Guidance for Data Useability in Risk Assessment. Part B provides supplemental guidance to Part A on planning and assessing radioanalytical data needs for the baseline human health risk assessment conducted as part of the remedial investigation process at sites containing radioactive substances. Part B is not a stand alone document and at all times should be used in conjunction with Part A.

Guidance for Data Usability in Risk Assessment: Quick Reference Fact Sheet (PDF) (8 pp, 350 kb, About PDF) September 1990
Bibliography of entries from categories of EPA documents.

Guidance Manual for the Integrated Exposure Uptake Biokinetic Model for Lead in Children (PDF) (February 1994) NTIS #PB93-963510, OSWER #9285.7-15-1.
Table of Contents and Glossary (PDF) (28 pp, 292 kb, About PDF)
Chapter 1 (PDF) (29 pp, 232 kb, About PDF)
Chapter 2 (PDF) (50 pp, 1.2 mb, About PDF)
Chapter 3 (PDF) (13 pp, 336 kb, About PDF)
Chapter 4 (PDF) (67 pp, 580 kb, About PDF)
Chapter 5 (PDF) (32 pp, 252 kb, About PDF)
Chapter 6 (PDF) (11 pp, 96 kb, About PDF)
Appendix A (PDF) (16 pp, 452 kb, About PDF)
Appendix B (PDF) (5 pp, 40 kb, About PDF)

Guidance on Cumulative Risk Assessment. Part 1. Planning and Scoping
Science Policy Council. U.S. Environmental Protection Agency, Science Policy Council (July 3, 1997).

Guidance on Risk Characterization for Risk Managers and Risk Assessors (1992)

Guidelines for Carcinogen Risk Assessment Federal Register 51(185):33992-34003 (1986).
This is the first revision of the 1976 Interim Procedures and Guidelines for Health Risk Assessments of Suspected Carcinogens (U.S. EPA, 1976; Albert et al., 1977).

Guidelines for Carcinogen Risk Assessment (PDF) (211 pp, 1 mb, About PDF) Review Draft, NCEA-F-0644 (July 1999). Risk Assessment Forum, Washington, DC
These guidelines revise and replace United States Environmental Protection Agency (EPA) Guidelines for Carcinogen Risk Assessment published in 51 FR 33992, September 24, 1986.

Guidance for Comparing Background and Chemical Concentrations in Soil for CERCLA Sites (PDF) (89 pp, 1.3 mb, About PDF) September 2002
This document provides guidance to the U.S. Environmental Protection Agency Regions concerning how the Agency intends to exercise its discretion in implementing one aspect of the CERCLA remedy selection process. The guidance is designed to implement national policy on these issues.

Guidelines for Developmental Toxicity Risk Assessment (PDF) (83 pp, 192 kb, About PDF) Federal Register 56(234):63798-63826 (1991).
These guidelines outline principles and methods for evaluating data from animal and human studies, exposure data, and other information to characterize risk to human development, growth, survival, and function because of exposure prior to conception, prenatally, or to infants and children.

Guidelines for Ecological Risk Assessment
EPA/630/R-95/002F (April, 1998)
These Agency-wide guidelines are provided to improve the quality and consistency of EPA's ecological risk assessments. The Guidelines expand on and replace the 1992 report Framework for Ecological Risk Assessment

Guidelines for Ecological Risk AssessmentThese Agency-wide guidelines are provided to improve the quality and consistency of EPA's ecological risk assessments. The Guidelines expand on and replace the 1992 report Framework for Ecological Risk Assessment

Guidelines for Mutagenicity Risk Assessment (PDF) (23 pp, 256 kb, About PDF) Federal Register 51(185):34006-34012 (1986).
The Guidelines for Mutagenicity Risk Assessment (hereafter . Guidelines . ) are intended to guide Agency analysis of mutagenicity data in line with the policies and procedures established in the statutes administered by EPA.

Guidelines for Neurotoxicity Risk Assessment (PDF) (89 pp, 184 kb, About PDF) Federal Register 63(93):26926-26954 (1998)
These Guidelines are intended to guide Agency evaluation of agents that are suspected to cause neurotoxicity, in line with the policies and procedures established in the statutes administered by the Agency.

Guidelines for Reproductive Toxicity Risk Assessment (PDF) (143 pp, 324 kb, About PDF) Federal Register 61(212):56274-56322 (1996)
This notice describes the scientific basis for concern about exposure to agents that cause reproductive toxicity, outlines the general process for assessing potential risk to humans from exposure to environmental agents, and addresses Science Advisory Board and public comments on the 1994 Proposed Guidelines for Reproductive Toxicity Risk Assessment.

Guidelines for the Health Risk Assessment of Chemical Mixtures (PDF) (38 pp, 300 kb, About PDF) 1986, Federal Register 51(185):34014-34025.
The guidelines are intended to guide Agency analysis of information relating to health effects data on chemical mixtures in line with the policies and procedures established in the statues administered by the EPA.

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H

Headquarters Consultation for Radioactively Contaminated Sites (PDF) (4 pp, 420 kb, About PDF) July 26, 2000
Memo documenting a request by EPA Headquarters that EPA Regional offices consult with HQ in certain circumstances when dealing with radioactively-contaminated sites.

Human Health Evaluation Manual, Supplemental Guidance, Standard Default Exposure Factors OSWER Directive 9285.6-03

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I

Integrated Exposure Uptake Biokinetic Model for Lead in Children (IEUBK)
The Integrated Exposure Uptake Biokinetic Model for Lead in Children (IEUBK) attempts to predict blood-lead concentrations (PbBs) for children exposed to lead in their environment. The model allows the user to input relevant absorption parameters (e.g., the fraction of lead absorbed from water) as well as intake and exposure rates.

Interim Policy for Particle Size and Limit Concentration Issues in Inhalation Toxicity: Notice of Availability Federal Register 59(206):53799 (1994)
EPA is making available to all interested parties, an Interim Policy for Particle Size and Limit Concentration Issues in Inhalation Toxicity Studies which deals with several of the most controversial issues encountered in inhalation toxicity studies.

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M

Methods for Derivation of Inhalation Reference Concentrations and Application of Inhalation Dosimetry 1994, EPA/600/8-90/066F

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N

National Recommended Ambient Water Quality Criteria (PDF) (36 pp, 404 kb, About PDF)
The criteria in this document (for 158 pollutants) provide guidance for states and tribes authorized to establish water quality standards under the Clean Water Act to protect human health and aquatic life.

New Policy on Evaluating Health Risks to Children From Administrator Carole Browner to: Assistant Administrators, General Counsel, Inspector General, Associate Administrators and Regional Administrators. October 20, 1995.

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P

Policy for Use of Probabilistic Analysis in Risk Assessment
Guiding Principles for Monte Carlo Analysis
Science Policy Council Handbook: Risk Characterization (PDF) (189 pp, 8.9 mb, About PDF)

Policy on Evaluating Health Risks to Children
EPA policy to consider the risks to infants and children consistently and explicitly as a part of risk assessments generated during decision making process, including the setting of standards to protect public health and the environment.

Preliminary Remediation Goals for Ecological Endpoints (PDF) (41 pp, 140 kb, About PDF)
Eco Update, (Guidance document dated August 31, 2000.) Preliminary Remediation Goals are upper concentration limits of specific chemicals that are expected to be protective of human health or the environment and are useful in risk assessment and decision making at Superfund sites.

Presenters' Manual for: Superfund Risk and Assessment and How You Can Help (PDF) (77 pp, 1 mb, About PDF)
EPA developed the 40-minute videotape "Superfund Risk Assessment and How You Can Help" to help explain in plain terms the Superfund human health risk assessment process and how communities can be involved.

Proposed Guidelines for Carcinogen Risk Assessment Federal Register 61(79):17960-18011 (1996).

Proposed Guidelines for Ecological Risk Assessment
These Proposed Guidelines are EPA's first Agency- wide ecological risk assessment guidelines. They are broad in scope, describing general principles and providing numerous examples to show how ecological risk assessment can be applied to a wide range of systems, stressors, and biological/spatial/temporal scales.

Provisional Guidance for Quantitative Risk Assessment of Polycyclic Aromatic Hydrocarbons, US EPA, 1993 EPA/600/R-93/C89. July 1993.
The Office of Health and Environmental Assessment (OHEA) recently completed an extensive document entitled "Drinking Water Criteria Document (DWCD) for Polycyclick Aromatic Hydrocarbons (PAHs)."

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R

Radiation Preliminary Remedial Goals for Superfund February 7, 2002
The purpose of this database is to provide a PRG calculation tool to assist risk assessors, remedial project managers, and others involved with risk assessment and decision-making at CERCLA sites in developing PRGs.

Radiation Risk Assessment at CERCLA Sites, Q&A (PDF) (23 pp, 2.2MB, About PDF) December 1999
Guidance to risk assessment at radioactively-contaminated CERCLA (Superfund) sites. All parts comprise a Q & A memo concerning radiation risk assessment at CERCLA sites.
Part 1 (PDF) (23 pp, 2.2MB, About PDF)
Part 2 (PDF) (5 pp, 798 kb, About PDF)
Part 3 (PDF) (6 pp, 1.02 mb, About PDF)
Part 4 (PDF) (6 pp, 708 kb, About PDF)
Guidance to risk assessment at radioactively-contaminated CERCLA (Superfund) sites. All parts comprise a Q & A memo concerning radiation risk assessment at CERCLA sites.

Radiation Risk Assessment Guidance (PDF) (37 pp, 1 mb, About PDF)
This chapter provides supplemental baseline risk assessment guidance for use at sites contaminated with radioactive substances that are included on the National Priorities List (NPL).

Radionuclide Table Slope Factors (Table 4 of HEAST) (PDF) (72 pp, 1.4 mb, About PDF)
As of April 16, 2001, this page has the current and correct Radionuclide Table (formerly HEAST Slope Factors - Table 4 ).

RBCA Fate and Transport Models: Compendium and Selection Guidance (PDF) (104 pp, 1 mb, About PDF) November 1998
This guidance document provides a compendium of readily available and commonly used models for RBCA applications and includes useful comparison tables, matrices and flowcharts that may aid the user in the selection of models by pathway. The document was funded wholly by US EPA-OUST under an assistance agreement to the American Society for Testing and Materials (ASTM) and received extensive review from States, U.S. EPA and the National Partnership in RBCA Implementation (PIRI).

Recommendations of the Technical Review Workgroup for Lead for an Approach to Assessing Risks Associated with Adult Exposures to Lead in Soils
This report describes a methodology for assessing risks associated with non-residential adult exposures to lead in soil.

(Revised) Policy on Performance of Risk Assessments During RI/FSs Conducted by PRPs (PDF) (3 pp, 43 kb, About PDF)
As part of the recently announced administrative reforms to the Superfund program, the Administrator stated that EPA would reaffirm its commitment to "allow PRP's to conduct risk assessments under proper circumstances as part of the overall site study (RI/FS)." This memorandum announces EPA's revised policy on allowing PRP's to conduct the risk assessment portion of the RI/FS.

Risk Assessment Guidance for Superfund, Volume I
Part A (1989)
Part B (1991)
Part C (1991)
Part D (1998)
Part E (2000)
Supplement to Part A: Community Involvement in Superfund Risk Assessments (1999)
The purpose of this guidance document is to provide the site team--risk assessor, remedial project manager (RPM), and community involvement coordinator--with information to improve community involvement in the Superfund risk assessment process.

Risk Assessment Guidance for Superfund (RAGS) Volume III - Part A: Process for Conducting Probabilistic Risk Assessment (2001)

Risk-Based Decision-Making Performance Assessment Study Bulletin #1 (PDF) (6 pp, 68 kb, About PDF) March 1999
This bulletin describes the Risk-Based Decision-Making (RBDM) Performance Assessment Study, provides an overview of potential performance criteria that may be useful for states evaluating RBDM-based Leaking Underground Storage Tank corrective action programs, and details preliminary study findings.

Risk-Based Decision-Making Performance Assessment Study Bulletin #2 (PDF) (11 pp, 252 kb, About PDF) March 2000
This bulletin describes EPA's and ASTM's efforts to assist state and territorial environmental regulatory agencies with the evaluation their RBDM corrective action programs performance for Leaking Underground Storage Tanks. The effort reviewed five individual state programs which have augmented their existing programs with RBDM and evaluated the impact RBDM has made on overall program performance. Bulletin # 2 presents the results of the study, evaluates the findings and provides general recommendations for other state and territorial agencies interested in tracking the performance of their RBDM programs.
Two-page flyer describing Bulletin #2 (PDF) (2 pp, 2.2 mb, About PDF)
Memo from Sammy Ng about Bulletin #2 (PDF) (2 pp, 12 kb, About PDF)

Risk Characterization for Ecological Risk Assessment of Contaminated Sites (PDF) (41 pp, 524 kb, About PDF) (October 1996)Link to EPA's External Link Disclaimer

Role of Background in the CERCLA Cleanup Program (PDF) (3 pp, 40 kb, About PDF) April 26, 2002
This document clarifies the U.S. Environmental Protection Agency (EPA) preferred approach for the consideration of background constituent concentrations of hazardous substances, pollutants, and contaminants in certain steps of the remedy selection process, such as risk assessment and risk management, at Comprehensive Environmental Response, Compensation, and Liability Act (CERCLA or "Superfund") sites.

Role of BTAGs in Ecological Assessment (PDF) (4 pp, 364 kb, About PDF) September 1991 Eco Update
This EcoUpdate bulletin describes the responsibilities and activities of the Biological Technical Assistance Group: a group of scientists established to aid remedial project managers.

Role of Natural Resource Trustees in the Superfund Process (PDF) (10 pp, 191 kb, About PDF) March 1992 Eco Update

The Role of Screening-Level Risk Assessments and Refining Contaminants of Concern in Baseline Ecological Risk Assessments (PDF) (4 pp, 364KB, About PDF) June 2001

Role of the Ecological Risk Assessment in the Baseline Risk Assessment (PDF) (2 pp, 180 mb, About PDF) OSWER Directive 9285.7-17, August 12, 1994
Describes the process and purpose of baseline ecological risk assessments, which, if required, come after screening level risk assessments.

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S

Science Policy Council Handbook: Peer Review (PDF) (185 pp, 3.5 mb, About PDF) Second Edition. Prepared by the Office of Science Policy, Office of Research and Development, Washington, DC. 2000, EPA 100-B-00-001

Science Policy Council Handbook: Risk Characterization (PDF) (189 pp, 8.9 mb, About PDF) Prepared by the Office of Science Policy, Office of Research and Development, Washington, DC. 2000, EPA 100-B-00-002

Screening Level Ecological Risk Assessment Protocol
1999
This is a guidance document that describes the process used in conducting ecological risk assessments at Hazardous Waste Combustion Facilities.

Selecting and Using Reference Information in Superfund ERAs, 1994

Soil Cleanup Criteria in 40 CFR Part 192 Uranium Mine Tailings Radiation Control Act, OSWER Directive 9200.4-25, February 12, 1998

Soil Screening Guidance July 1996
The Soil Screening Guidance (SSG) presents a framework for developing risk-based, soil screening levels (SSLs) for protection of human health.

Soil Screening Guidance for Radionuclides November 20, 2000 (date of the transmittal of *Standards, Advisories and Guidance for the Management of Radioactive Waste, July 1989, Chapter 5 of CERCLA Compliance with other Laws Manual: Part II)

Standard Guide for Risk-Based Corrective Action Applied at Petroleum Release SitesLink to EPA's External Link DisclaimerE1739-95e1, September 10, 1995
This is an American Society for Testing and Materials (ASTM) guide to risk-based corrective action (RBCA), which is a consistent decision-making process for the assessment and response to a petroleum release, based on the protection of human health and the environment. The decision process described in this guide integrates risk and exposure assessment practices, as suggested by the U.S. EPA, with site assessment activities and remedial measure selection to ensure that the chosen action is protective of human health and the environment.

Supplemental Guidance for Developing Soil Screening Levels for Superfund Sites (PDF) (106 pp, 1.9MB, About PDF) December 2002, OSWER 9355.4-24
This document is intended as companion guidance to the 1996 SSG for residential use scenarios at NPL sites.

Supplementary Guidance for Conducting Health Risk Assessment of Chemical Mixtures (PDF) EPA630-R-00-002 (August, 2001) (209pp, 1.19MB, About PDF)
This document is a supplement to the EPA Guidelines for the Health Risk Assessment of Chemical Mixtures of 1986. The 1986 Guidelines represent the Agency's science policy and are a procedural guide for evaluating data on the health risks from exposures to chemical mixtures.

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T

Technical Support Document for the Integrated Exposure Uptake Biokinetic Model for Lead in Children (December 1994) (PDF) (115 pp, 928 kb, About PDF) NTIS #PB94-963505, OSWER #9285.7-22.
The Technical Support Document describes in detail the basis for the parameters and equations that are used in the Integrated Exposure Uptake Biokinetic Model for Lead in Children, version 0.99d. It is a supplement to the Guidance Manual that was published in February, 1994, and is available from the National Technical Information Service as document PB93-963510.

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U

Use of IRIS Values in Superfund Risk Assessment (PDF) (3 pp, 213KB, About PDF)Link to EPA's External Link DisclaimerOSWER Directive 9285.7-16, December 21, 1993
This memorandum clarifies the policy stated at section 7.4.1 of the December 1988 Risk Assessment Guidance for Superfund (Volume I) Human Health Evaluation Manual (Part A) (RAGS) on the use of Integrated Risk Information System (IRIS) values in performing health risk assessments.

Use of the Benchmark Dose Approach in Health Risk Assessment 1995, EPA/630/R-94/007
The U.S. Environmental Protection Agency (EPA) frequently calculates a reference dose (RfD) or reference concentration (RfC), which is used along with other scientific information in setting standards for noncancer human health effects.

Use Of Risk-Based Decision-Making In UST Corrective Action Programs OSWER Directive 9610.17. March 1, 1995
The primary purpose of this policy statement is to encourage the use of risk-based decision-making as an integral part of the corrective action process at sites where leaking underground storage tank (UST) systems have released petroleum products into the environment and thus created risks to human health and the environment. In addition, this policy statement provides guidelines to help UST implementing agencies develop and use risk-based decision-making in a manner consistent with the Federal law and regulations applicable to UST corrective action.

Use of Uranium Drinking Water Standards under 40 CFR 141 and 40 CFR 192 as Remediation Goals for Groundwater at CERCLA Sites (PDF) (11 pp, 420 kb, About PDF) November 6, 2001
Memo addressing the use of uranium standards when establishing remediation goals in groundwater in CERCLA (Superfund) sites that may be current or future sources of drinking water.

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V

Validation Strategy for The Integrated Exposure Uptake Biokinetic Model for Lead in Children (December 1994) (PDF) (30 pp, 232KB, About PDF)
This document describes the considerations and methods for characterizing the confidence to place in output from the Integrated Exposure Uptake Biokinetic (IEUBK) Model for Lead in Children, version 0.99d.

Vapor Intrusion Guidance (178 pp, 1.92MB, About PDF)
OSWER Draft Guidance for Evaluating the Vapor Intrusion to Indoor Air Pathway from Groundwater and Soils (Subsurface Vapor Intrusion Guidance). Provides current technical and policy recommendations on determining if the vapor intrusion pathway poses an unacceptable risk to human health at cleanup sites.

 

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