Tomorrow, March 24, between 8 and 9 am, Waste Management in El Cajon will be working on piece of equipment at their location on O’Connor Street, near Bradley and N. Marshall. The work may produce a strong odor from Mercaptan. Also known as methanethiol, this is a foul-smelling gas that is added to natural gas as an added safety measure to ensure that natural gas leaks do not go undetected.