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K- <br />EXHIBIT 4-1 <br />ELEMENTS OF A CONCEPTLAL EVALUATION MODEL <br />VARIABLES <br />SOURCES <br />P <br />T <br />H <br />W <br />A <br />Y <br />S <br />RECEPTORS <br />• CONTAMINANTS ~ <br />RATIONS <br />• TIME <br />• LOCATIONS <br />• MEDI <br />• RATES OF MIGRATION <br />• TIME <br />• LOSS AND GAIN FUNCTIONS <br />• TYPES <br />• SENSITIVITIES <br />• TIME <br />• CONCENTRATIONS <br />• NUMBERS <br />HYPOTHESES TO <br />0E TESTED <br />•• S0~ STS ? <br />• SOURCE CAIV BE CONTAINED <br />• SOURCE CAIV BE REMOVED <br />AND DISPOSED <br />• SOURCE CAN BE TREATED <br />• PATHWAY EXISTS ? <br />• PATHWAY CAN BE <br />INTERRUPTED <br />• PATHWAY CAN BE <br />ELIMINATED <br />• RECEPTOR IS NOT <br />IMPACTED BY MIGRATION <br />Of CONTAMINANTS <br />• RECEPTOR C/W BE <br />RELOCATED <br />• INSTITUTIONAL CONTROLS <br />CAN 8E APPLIIcD <br />• RECEPTOR CAN BE <br />PROTECTED <br />SOURCE EPA t9B7>t <br />Fiqure 3 <br />