[Federal Register Volume 66, Number 21 (Wednesday, January 31, 2001)]
[Notices]
[Pages 8401-8402]
From the Federal Register Online via the Government Publishing Office [www.gpo.gov]
[FR Doc No: 01-2672]


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ENVIRONMENTAL PROTECTION AGENCY

[FRL-6939-8]


Options for Development of Parametric Probability Distributions 
for Exposure Factors

AGENCY: Environmental Protection Agency (EPA).

ACTION: Notice of availability of a final report.

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SUMMARY: The notice announces the availability of a final report, 
Options for Development of Parametric Probability Distributions for 
Exposure Factors (EPA/600/R-00/058, July 2000). This report was 
prepared by the National Center for Environmental Assessment, within 
the Office of Research and Development (EPA) at the request of the 
Office of Emergency and Remedial Response within the Office of Solid 
Waste and Emergency Response, to assist them when applying 
probabilistic techniques in exposure assessments. The purpose of the 
document is to provide procedures to fit distributions to selected data 
from the Exposure Factors Handbook (EPA/600/P-95/002Fa-c). The 
procedure includes the selection of models, estimation, assessment of 
fit, and uncertainty. Three exposure factors were used as test cases. 
These included tap water intake, inhalation rates, and population 
mobility. The procedures used in these three exposure factors are 
fairly general and applicable to other factors.

ADDRESSES: The document will be made available electronically through 
the National Center for Environmental Assessment's web site 
(www.epa.gov/ncea). A limited number of paper copies will be available 
from the EPA's National Service Center for Environmental Publications 
(NSCEP), P.O. Box 42419, Cincinnati, OH 45242; telephone: 1-800-490-
9198 or 513-489-8190; facsimile: 513-489-8695. Please provide your name 
and mailing address and the title and EPA number of the requested 
publication.

FOR FURTHER INFORMATION CONTACT: Jacqueline Moya, National Center for 
Environmental Assessment-Washington Office (8623D), U.S. Environmental 
Protection Agency, Washington DC 20460; telephone: 202-564-3245; 
facsimile: 202-565-0076; email:[email protected].

SUPPLEMENTARY INFORMATION: Since the publication of the Exposure 
Factors Handbook (EPA/600/P-95/002Fa-c) in 1997, users of the Handbook 
have commented on the need to fit distributions to the data in the 
Handbook to assist them when applying methods to express assessments. 
This report is issued as a companion document to the Exposure Factors 
Handbook.
    The methodology presented in the document was tested with three 
exposure factors: tap water, inhalation rates, and population mobility. 
However, the document provides a discussion on the applicability of 
this methodology to other exposure factors in the Exposure Factors 
Handbook.
    The report discusses the pertinent statistical concepts and theory 
used and how they apply to the methodology developed for the fitting of 
distributions. The methodology models, estimation, assessment of fit, 
and uncertainty.


[[Page 8402]]


    Dated: December 22, 2000.
Bruce Rodan,
Director, National Center for Environmental Assessment.
[FR Doc. 01-2672 Filed 1-30-01; 8:45 am]
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