Pennsylvania Statutes Title 52 P.S. Mines and Mining § 690-106.2. Emergency shelters and chambers

(1) Provide a minimum of 48 hours of life support, including air, water, emergency medical supplies and food, for the maximum number of miners reasonably expected to be on the working section.

(2) Be capable of surviving an initial event with a peak over pressure of 15 pounds per square inch for three seconds and a flash fire, as defined by National Fire Protection Association standard NFPA-2113, of 300 degrees Fahrenheit for three seconds.

(3) Be constructed in a manner that the emergency shelter or chamber will be protected under normal handling and pre-event mine conditions.

(4) Provide for rapidly establishing and maintaining an internal shelter atmosphere of oxygen above 19.5%, carbon dioxide below 0.5%.

(5) Provide for carbon monoxide below 50 parts per million and an apparent-temperature of 95 degrees Fahrenheit.

(6) Provide the ability to monitor carbon monoxide and oxygen inside and outside the shelter or chamber.

(7) Provide a means for entry and exit that maintains the integrity of the internal atmosphere.

(8) Provide a means for MSHA-certified intrinsically safe power if power is required.

(9) Provide a minimum of eight quarts of water per miner.

(10) Provide a minimum of 4,000 calories of food per miner.

(11) Provide a means for disposal of human waste to the outside of the shelter or chamber.

(12) Provide a first aid kit.

(13) Have provisions for inspection of the shelter or chamber and its contents.

(14) Contain manufacturer-recommended repair materials.

(15) Provide a battery-powered, occupant-activated strobe light, of a model approved by the board, that is visible from the outside indicating occupancy.

(16) Provide provisions for communication to the surface.

(17) Provide proof of current approval for all items and materials subject to approval.