Roleset contaminate.01 Verbnet Class: 1 "befoul":

Roles:

Arg0:causer of contamination


Arg1:thing becoming contaminated


Arg2:contaminant

Examples:

person: ns tense: past aspect: perfect voice: active form: participle


transitive (-)
At stake was an $80,000 settlement involving who should pay what share of cleanup costs at the site of a former gas station, where underground fuel tanks had leaked and contaminated the soil.
Arg0:	underground fuel tanks
REL:	contaminated
Arg1:	the soil

person: third tense: present aspect: ns voice: active form: full


with contaminant (-)
John contaminates any room he enters with his foul stench.
Arg0:	John
REL:	contaminates
Arg1:	any room he enters
Arg2-with:	his foul stench

Do try to distinguish between agent/source of contamination and the contaminant itself; this will result in some Arg2's being subjects.