Fourth HazMat Shift Harris County HazMat is proud to announce that they have completed their transition to a new twenty-four hour shift schedule effective Saturday, March 13, 2010. The new schedule adds a fourth shift for HCHMRT and provides constant 24 hour staffing at the Harris County HazMat Station. A full 24 hour/365 day response capability enables HMRT to provide the “best possible customer service”. Benefits of the new staffing approach include enhanced Hazardous Materials/WMD response, reduced response times, and an overall reduction in overtime cost.