                                                           File: YEAR2000.TXT


           LC50 Model System Year 2000 (Y2K) Compliance Statement


               Center for Exposure Assessment Modeling (CEAM)
     National Exposure Research Laboratory - Ecosystems Research Division
                  Office of Research and Development (ORD)
               U.S. Environmental Protection Agency (U.S. EPA)
                          960 College Station Road
                         Athens, Georgia 30605-2700

                                706/355-8400



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                                  Summary

The U.S. Environmental Protection Agency's (US EPA) Center for Exposure
Assessment Modeling (CEAM), Athens, Georgia, modified and tested the LC50
model for possible failure(s) due to the use of a calendar date beyond
12/31/1999 (e.g., 1/1/2000).  LC50 model execution was found to be free of
any year 2000-related problems.

The date field contained within the code is defined as a 10 character, format
free field.  It is used to 1) prompt the user for the date of the simulation,
and 2) display on the monitor screen and print to an output file, the date of
the simulation.  The date is not used for computations.

Refer to LC50 documentation (USERMANU.PDF) for a description and sample use
of the date field.

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