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Health and Safety Plan Page 7 3.7 Confined Space Hazards When work is to be done in an area where the natural circulation of fresh air or the ability to readily escape the site is restricted, that site shall be considered a confined space, and the following guidelines shall be followed: * Personnel shall monitor the levels of oxygen, combustible gases, and organic vapors prior to entering. Under no circumstances shall the space be metered if the following levels are exceeded: 1. Oxygen content is less than 19.5% 2. Combustible gas level is greater than 3% of the LEL. 3. Total hydrocarbons are greater than the action levels defined in Table 3 of this Section, if all air contaminants have not been identified. * Personnel shall monitor the levels of oxygen, combustible gases, and organic vapors continuously while inside the confined space. If the values stated in the above are exceeded, the space shall be evacuated of all personnel immediately. * At least one additional person, who shall be present for the express purpose of monitoring the personnel in the space, shall be within sight and call of those personnel within the space, while remaining outside the space proper. This person shall have, readily available to him, all rescue equipment necessary to remove personnel who may require extraction from the space and the site. This equipment shall include, but not be limited to, respiration equipment of the same level as those used by the personnel in the space, first aid equipment, including compresses, harness, and all the extraction equipment. * Portable fans or blowers shall be used to introduce fresh air into the confined space. These fans or blowers shall be located on the upwind side of the space. The space shall not be entered until values of oxygen, organic vapors, and combustible gases are brought below and measured below their respective action levels. * No personnel shall enter any unshored or unsupported excavation with a depth greater than 5 feet, or with unstable geological conditions.