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Re: Heptane and PCBs
By 1990, most responsible companies had eliminated PCB's from their facilities or had them well confined in electrical rooms. PCB transformers require periodic testing that would generate sampling and laboratory waste (as Dr. Cooper mentioned).
One good clue would be the purity of the heptane. If it's pretty pure, the application was probably either a laboratory or some kind of a precision manufacturing use like clean-up of PCB containing electrical components.
Industrial heptane is really a distillation cut of many organic compounds with similar boiling points and the the heptane fraction may be less than 50%. This "heptane" would likely be used in larger scale applications like flushing transformers before disposal or during repacement of PCB fluids. These PCB-containing fluids were typically incinerated in the 1980's. Good Luck!
Pollution Prevention Program
Colorado Department of Public Health
4300 Cherry Creek Drive So.
Denver, Co 80246-1530
Ph: (303) 692-2977
Fax: (303) 782-4969