Exhibit A quantitatively presents the data base of the
chemical compounds for which studies were.conducted by
Industrial Bio-Test Laboratories. The IBT studies are
designated by the letter 0. Studies in the EPA data base
done by labs other than IBT are designated by the letter

X. ,

The studies are arrayed across six categories of chronic _ .
effects. These chronic effects are: oncogenicity, terato-
genicity, mutagenicity, reproductive effects, neurotoxicity,
'and other chronic effects. ;
Some of the chemicals in this exhibit appear to have no

IBT studies because the studies conducted for these chemicals
by IBT were all in the acute categories. The chemical names
used are those that were listed in the IBT records. There

is no designation of the validity or invalidity of the IBT
studies presented. Specific information of th@ss nature is
in Exhibit B.

Exhibit A also notes any ongoing regulatory activity ©

that will generate chronic data ror these chemicals. ~— me
The types of regulatory activity that cause the generation
of data are: the registration standard program, the data
call in program, the rebuttable presumption against
registration program, and any special action employing

the 3c2b provision of the Federal Insecticide, Fungicide,
Rodenticide Act. There are approximately 2830 chronic
studies indicated in this data base.