ELGIN, Ill.–(BUSINESS WIRE)–Heritage-Crystal Clean, Inc. (Nasdaq: HCCI), a leading provider of parts cleaning, used oil re-refining, and hazardous and non-hazardous waste services primarily focused on small and mid-sized customers, today announced results for the third quarter which ended September 11, 2021. Third Quarter Review Revenue for the third quarter of 2021 was $123.2 million compared to $87.1 million for the same quarter of 2020, an increase of 41.4%. Overall Operating Margin jumped