2 CCR 407-6-5 - VENTILATION

1. Air in all active working and all other areas of the tourist mine where people are required to work or travel shall contain at least 19.5% volume percent oxygen. To assure 19.5% volume percent oxygen is maintained, a test will be taken with a calibrated electronic oxygen meter. In addition to the electronic oxygen meter, a flame safety lamp may be used as a backup measuring device.

2. All underground main fans shall have controls placed at a suitable protected location remote from the fan and preferably on the surface.

3. When auxiliary fan systems are used, such systems shall minimize recirculation and be maintained to provide ventilation air that effectively sweeps the affected area.

4. Unventilated areas shall be sealed or barricaded and posted against entry.

5. Unless an approved method of detecting hydrogen gas is available, all battery charging stations will either be located on the surface or will be ventilated directly to the surface with a sufficient volume of air to prevent the accumulation of hydrogen gas.

Notes

2 CCR 407-6-5