Depending upon quarry operational requirements, operating mobile equipment to include, but not limited to front end loaders (993s, 992s, 980s, etc.), haul trucks, dozers, backhoes, grader, excavators, fuel truck, dredge and skid steer loaders. Employees that are required to wear respirators must be clean shaven where the respirator seal meets the face in order to pass the qualitative and quantitative fit test.