An administrative law judge accepted a supplement to a respondent's earlier prehearing exchange after determining that the complainant had not been denied a meaningful opportunity to review and respond to the contents of the supplement. The case regards an allegation by the EPA that Aguakem Caribe, Inc. violated regulations governing the management of hazardous waste and used oil set forth in 40 C.F.R. parts 260 through 279 at its chemical plant in Ponce, P.R.