What is a common constituent of interest (COI) that accompanies waste oil?

Muriatic acid, also known as hydrochloric acid, is recognized as a common constituent of interest (COI) that can accompany waste oil. This is due to the nature of the substances often found in conjunction with waste oils, particularly in industrial settings where the oil might be used in operations that involve chemical processes or cleaning agents. Muriatic acid is sometimes employed for cleaning, and if not properly neutralized or disposed of, it can end up mixed with waste oils, making it a concern during assessments for environmental contamination. Recognizing the potential presence of such substances is critical for ensuring thorough site assessments and appropriate remediation measures in the management of underground storage tanks and related waste. Understanding how waste oil and muriatic acid can interact helps in identifying adequate safety measures and compliance with environmental regulations.