The P.I. is to prepare written "standard operating, service and maintenance procedures" for each Class 4 laser; it is also recommended that such procedures be prepared for Class 3B lasers. Written alignment procedures are to be posted in the area or kept with the equipment. At a minimum, the most salient features of laser safety are to be posted in a clearly visible manner at each laser installation. General exposure guidelines, special precautions, or unusual conditions may be outlined. The "owners manual" should be available to operators.