(a) Any area suspected of insufficient oxygen or contamination by flammable or toxic gases, such as Hydrogen Sulfide (H2S) vapors or dust shall not be entered until sufficient tests have been made with appropriate instruments to determine extent of hazard and area is purged to reduce the hazard to an allowable concentration.
(b) In the case of toxic atmosphere or lack of oxygen, any employee entering such area shall be required to use the proper respiratory equipment.
(c) In addition, any employee entering such atmospheres as specified in 5.(b) of this Section shall be required to wear a safety belt with attached tail line for emergency retrieval. Employee shall be stationed outside the hazard area with the proper rescue equipment to assist in case of emergency, and to attend to the retrieve end of the tail line.
(d) Canister-type filter masks shall be used only in an area where sufficient oxygen exists (at least 16 percent by volume).
(e) Canister-type filter masks shall be used only in areas where their capabilities will not be exceeded. Such canisters shall be proper for the hazardous contaminant.
(f) In those atmospheres where tests indicate oxygen content is less than nineteen and a half (19.5) percent oxygen by volume), employees shall be provided with and required to use self-contained breathing apparatus (SCBAs); or
(g) Supplied-air breathing apparatus may be used instead of SCBAs in subparagraph f. of this Section. In the event supplied-air breathing apparatus are used, they shall be selected, used and maintained in accordance with Subpart I, Section 3.- Respiratory Protection, of the State of Wyoming Occupational Health and Safety 1910 - General Rules and Regulations.
(h) All respirators on work locations shall be: (NOTE: Caution should be observed when using SCBAs at low temperatures due to pressure drop.)
(i) All employees shall be trained in the use and operation of employer provided breathing equipment available on the job and employees whose facial contours, physical impairments, hair or beard styles that would interfere with the seal necessary for respiratory protective devices, shall not enter areas in which such protection devices may be necessary.
(j) The well operator, prior to commencement of work in an area (i.e. clearing stage of the well site), shall provide provisions for contacting the nearest and other appropriate emergency medical services in case of serious injury.
(k) There shall be provided a first aid kit (not less than twenty four (24) unit type) that shall be maintained at the drilling site and inspected at frequent intervals. The first aid kit shall be replenished when any unit in the kit reaches a twenty five (25) percent depletion of that unit.
(l) One (1) or more employees on each drilling site shall be adequately trained to render first aid and cardiopulmonary resuscitation (CPR), and shall have a valid certificate from the American Red Cross or equivalent training that can be verified by documentary evidence, and who will always be present.
(m) Where the eyes or body of personnel may be exposed to injurious materials, eyewash equipment for emergency use shall be provided. For information on emergency eyewash and shower equipment see, American National Standard Institute (ANSI) Z358.1-Current Edition.
053-4 Wyo. Code R. § 4-5