[Federal Register Volume 69, Number 193 (Wednesday, October 6, 2004)]
[Notices]
[Page 59923]
From the Federal Register Online via the Government Publishing Office [www.gpo.gov]
[FR Doc No: 04-22486]


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ENVIRONMENTAL PROTECTION AGENCY

[FRL-7824-8]


Rapid Processing of Turner Designs Model 10-AU-005 Internally 
Logged Fluorescence Data

AGENCY: Environmental Protection Agency.

ACTION: Notice of availability of a final document.

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SUMMARY: This notice announces the availability of a final report 
titled, Rapid Processing of Turner Designs Model 10-AU-005 Internally 
Logged Fluorescence Data (EPA/600/R-04/053, August 2004), which was 
prepared by the U.S. Environmental Protection Agency's (EPA) National 
Center for Environmental Assessment (NCEA) of the Office of Research 
and Development (ORD).

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

FOR FURTHER INFORMATION CONTACT: The Technical Information Staff, 
National Center for Environmental Assessment/Washington Office (8623D), 
U.S. Environmental Protection Agency, 1200 Pennsylvania Avenue, NW., 
Washington, DC 20460. Telephone: 202-564-3261; fax: 202-565-0050; e-
mail: [email protected].

SUPPLEMENTARY INFORMATION: The U.S. EPA has used field fluorometers to 
measure dye fluorescence when such dyes are injected into ground water 
to trace groundwater flow. Typically, the data output from these off 
the shelf fluorometers are not optimized for field use or subsequential 
analysis. EPA has developed a methodology to enhance the usability of 
fluorometer data and is sharing that information with the user 
community.
    This document and the related computer program, FLOWTHRU, provide a 
method for rewriting data internally logged by a fluorometer used by 
EPA (Turner Designs Model 10-AU-005 Field Fluorometer), thus optimizing 
the utility of the instrument's stored data. Application of the 
methodology provides the information necessary for rapid examination of 
tracer test results and preparation of data sets for numerical 
analysis. The new computer program bypasses block headers, reads the 
downloaded data, identifies the time-concentration units used, and 
relates the data to injection time. All preinjection time-concentration 
data are accorded background data status and are written to a 
background file with average temperature values included. All time 
values recorded after injection time are rewritten into decimal time 
using time units chosen by user. Additional features include options 
for processing selected percentages, averaged time values, and a 
smoothing routine that may be applied to the time-concentration data. 
FLOWTHRU also allows users to view the data converted to decimal time 
directly on the computer monitor without program interruption or to go 
directly to a data plotting routine. Data plotting is rapid and clear 
with a smooth line connecting each data point, and each data plot may 
be saved as a file in a common format.

    Dated: September 27, 2004.
Peter Preuss,
Director, National Center for Environmental Assessment.
[FR Doc. 04-22486 Filed 10-5-04; 8:45 am]
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