the report describes preliminary attempts to formulate viable models for interpreting environmental assessment data. the models are evaluated using data from the four most comprehensive environmental assessments. a format for entering environmental assessment results on fortran computer sheets is presented and more complete data entry sheets, being developed by ierl-rtp are discussed. various previously proposed models (source severity; source assessment models sam/i, sam/ia, and sam/ib) are investigated using the data from the four previously mentioned studies. correlations between biotests and chemical results, and between biotests, were calculated using the data from these four studies; a summary of possible correlations is presented. in the study of correlations, the data are examined from each study individually and from the entire data set taken as a whole. generally, results do not reveal a strong degree of association between the chemical analyses and the biological tests when all factors relevant to an intelligent decision on the acceptability of a waste stream are considered, there appears to be no mathematical model that will encompass all of them. the models are useful but must still be utilized with considerable care