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ReachScan
What Does ReachScan Do?
. Estimates surface water chemical concentrations at drinking water
utilities downstream from industrial facilities.
. Estimates the populations served by those drinking water utilities.
. Serves as a database for the identification of facilities and utilities.
. Estimates the number of days per year that an aquatic ecotoxicological
concern concentration will be exceeded in the subject stream or stream
segment. A chemical's aquatic ecotoxicological concern concentration
is the estimated concentration at which the chemical may adversely
affect aquatic organisms.
. Provides stream flow statistics on a daily average basis.
. Determines the presence of endangered species or critical habitats
in the county of the releasing facility.
How Does ReachScan Work?
. Operates as an integrated software package, with links to other
computer-based programs developed by the U.S. Environmental Protection
Agency (EPA), including the Probabilistic Dilution Model (PDM3) and
the Endangered Species Data Base.
. Estimates chemical concentrations in single or multiple stream (segments)
reaches by simple dilution or using simple fate algorithms.
. Instructions to install and run the model are not presented here.
What Do I Need to Use ReachScan?
. Facility information, such as:
. National Pollution Discharge Elimination System (NPDES) number.
. Facility name.
. Standard Industry Classification (SIC) code.
. Reach number (an 11-digit number that identifies a specific section
of a stream).
. Distance up- or downstream to consider.
. Amount of chemical released to stream.
. Chemical properties (if chemical fate is to be considered), including:
. Molecular weight, Solubility, Vapor pressure, Soil Adsorption Coefficient
(Koc), Half-life.
How Are ReachScan Data Used?
Risk assessors use data on chemical concentrations in streams surrounding
an industrial or utility discharge to estimate fish bioconcentration
rates and potential dose rates for humans exposed via ingestion of
drinking water and fish.
ReachScan can also be used to determine how a release may affect endangered
species or critical habitats surrounding an industrial facility or
utility.
What Type of Computer System Do I Need?
Hardware: Personal computer with 640K memory and 18 MB hard
disk space.
Software: MS-DOS 3.0 or higher.
What Is ReachScan's Status and Availability?
This program is currently in a DOS format. A Windows-based version
of this model is under development. ReachScan has not been peer reviewed
in accordance with EPA Peer Review Guidance but will be scheduled
for peer review upon completion of the Windows-based version. ReachScan
was developed under contract by Versar Inc. for the EPA Office of
Pollution Prevention and Toxics, Economics, Exposure, and Technology
Division, Exposure Assessment Branch (EAB).
For more information about the model, contact:
David Lynch
US Environmental Protection Agency
1200 Pennsylvania Avenue N.W.
Washington, DC 20460
Mail Code 7406M
Phone #: (202) 564-8532
e-mail: lynch.david@epa.gov
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