 ELGIN, Ill.--BUSINESS WIRE--Heritage-Crystal Clean, Inc. Nasdaq:HCCI plans to release its financial results for the first quarter of 2021, which ended March 27, 2021, after the market close on Tuesday, May 4, 2021. The company will host a conference call on Wednesday, May 5, 2021 at 9:30 AM Central Time, during which management will give a presentation focusing on the Companys operations and financial results. Interested parties can listen to the audio webcast available through our company 