All contractors will wear appropriate safety gear for the environment that they are working in. ANSI Class 2 (or greater) vests will be worn on any site that is under construction, remote in nature or when professional safety attire is required. Certified bump protection (hard hats) will be worn when there is any risk or injury or when the site is an active construction zone. Contractors will also have available respiratory devices up to and/or including Chemical, Biological, Radiological & Nuclear (CBRN) protection with one filter at minimum. These masks will be inspected periodically and are to be used if exposure to unknown contaminants is likely or suspected. Air filtration masks (such as the KN95 or similar) will also be available and will be in use when standard protection is necessary. All contractors will wear issued identification and said credentials will be visible in a prominent location at all times while performing work. All personnel will abide by regulations set by any specific site (and/or those set by contract holder) at all times while conducting business.