All of Clark County’s emergency service agencies and about 150 volunteers were involved in the exercise Wednesday as well as Winchester Public Works, the Clark County Road Department and Clark Regional Medical Center. The annual exercise is organized through the Chemical Stockpile Emergency Preparedness Program and focuses on local responses in case of a release of nerve agents from the storage facility in Madison County. This year’s scenario did not directly involve Clark County, but Clark County Emergency Management Director Gary Epperson said there were side scenarios for the hospital and others to practice their decontamination procedures.