Additional measures and procedures, Type 3 operations
 18. (1) In addition to the measures and procedures prescribed by section 15, the following measures and procedures apply to Type 3 operations: 1. The work area shall be separated from the rest of the workplace by walls, the placing of barricades or fencing or other suitable means. 2. Subsection (2) applies to an operation mentioned in paragraph 5 of subsection 12 (4). 3. Subsection (3) applies to an operation mentioned in paragraph 1, 2, 3 or 4 of subsection 12 (4) that is carried on outdoors. 4. Subsection (4) applies to an operation mentioned in paragraph 1, 2, 3, 4 or 6 of subsection 12 (4) that is carried on indoors.  O. Reg. 278/05, s. 18 (1). (2) In the case of an operation mentioned in paragraph 5 of subsection 12 (4), the following measures and procedures also apply: 1. The spread of dust from the work area shall be prevented by, i. using enclosures of polyethylene or other suitable material that is impervious to asbestos (including, if the enclosure material is opaque, one or more transparent window areas to allow observation of the entire work area from outside the enclosure), if the work area is not enclosed by walls, and ii. using curtains of polyethylene sheeting or other suitable material that is impervious to asbestos, fitted on each side of each entrance or exit from the work area. 2. Unless the operation is carried on outdoors, or inside a building that is to be demolished and will not be entered by any person except the workers involved in the operation and the workers involved in the demolition, the spread of dust from the work area shall also be prevented by, i. creating and maintaining within the enclosed area, by installing a ventilation system equipped with a HEPA filtered exhaust unit, a negative air pressure of 0.02 inches of water, relative to the area outside the enclosed area, ii. ensuring that replacement air is taken from outside the enclosed area and is free from contamination with any hazardous dust, vapour, smoke, fume, mist or gas, and iii. using a device, at regular intervals, to measure the difference in air pressure between the enclosed area and the area outside it. 3. The ventilation system referred to in subparagraph 2 i shall be inspected and maintained by a competent worker before each use to ensure that there is no air leakage, and if the filter is found to be damaged or defective, it shall be replaced before the ventilation system is used. 4. Before leaving the work area, a worker shall, i. decontaminate his or her protective clothing by using a vacuum equipped with a HEPA filter, or by damp wiping, before removing the protective clothing, and ii. if the protective clothing will not be reused, place it in a container as described in paragraph 5 of section 15. 5. Facilities for the washing of hands and face shall be made available to workers and shall be used by every worker when leaving the work area.  O. Reg. 278/05, s. 18 (2). (3) In the case of an operation mentioned in paragraph 1, 2, 3 or 4 of subsection 12 (4) that is carried on outdoors, the following measures and procedures also apply: 1. If practicable, any asbestos-containing material to be removed shall be thoroughly wetted before and during removal, unless wetting would create a hazard or cause damage. 2. Dust and waste shall not be permitted to fall freely from one work level to another. 3. If practicable, the work area shall be washed down with water after completion of the clean-up and removal described in paragraph 6 of section 15. 4. Temporary electrical power distribution systems for tools and equipment involved in wet removal operations shall be equipped with ground fault circuit interrupters. 5. A decontamination facility shall be located as close as practicable to the work area and shall consist of, i. a room suitable for changing into protective clothing and for storing contaminated protective clothing and equipment, ii. a shower room as described in paragraph 7 of subsection (4), and iii. a room suitable for changing into street clothes and for storing clean clothing and equipment. 6. The rooms described in subparagraphs 5 i, ii and iii shall be arranged in sequence and constructed so that any person entering or leaving the work area must pass through each room. 7. When leaving the work area, a worker shall enter the decontamination facility and shall, in the following order, i. decontaminate his or her protective clothing by using a vacuum equipped with a HEPA filter, or by damp wiping, before removing the protective clothing, ii. if the protective clothing will not be reused, place it in a container as described in paragraph 5 of section 15, iii. shower, and iv. remove and clean the respirator.  O. Reg. 278/05, s. 18 (3). (4) In the case of an operation mentioned in paragraph 1, 2, 3, 4 or 6 of subsection 12 (4) that is carried on indoors, the following measures and procedures also apply: 1. Friable asbestos-containing material that is crumbled, pulverized or powdered and that is lying on any surface in the work area shall be cleaned up and removed using a vacuum equipped with a HEPA filter or by damp wiping and everything shall be removed from the work area or covered with polyethylene sheeting or other suitable material that is impervious to asbestos. 2. The spread of dust from the work area shall be prevented by an enclosure of polyethylene or other suitable material that is impervious to asbestos, if the work area is not enclosed by walls, and by a decontamination facility consisting of a series of interconnecting rooms including, i. a room suitable for changing into protective clothing and for storing contaminated protective clothing and equipment, ii. a shower room as described in paragraph 7, iii. a room suitable for changing into street clothes and for storing clean clothing and equipment, and iv. curtains of polyethylene sheeting or other suitable material that is impervious to asbestos, fitted to each side of the entrance or exit to each room. 3. The rooms described in subparagraphs 2 i, ii and iii shall be arranged in sequence and constructed so that any person entering or leaving the work area must pass through each room. 4. The mechanical ventilation system serving the work area shall be disabled and all openings or voids, including ventilation ducts to or from the work area, shall be sealed by tape or other appropriate means. 5. Unless the operation is carried on inside a building that is to be demolished and will not be entered by any person except the workers involved in the operation and the workers involved in the demolition, the spread of dust from the work area shall also be prevented by, i. creating and maintaining within the enclosed area, by installing a ventilation system equipped with a HEPA filtered exhaust unit, a negative air pressure of 0.02 inches of water, relative to the area outside the enclosed area, ii. ensuring that replacement air is taken from outside the enclosed area and is free from contamination with any hazardous dust, vapour, smoke, fume, mist or gas, and iii. using a device, at regular intervals, to measure the difference in air pressure between the enclosed area and the area outside it. 6. The ventilation system referred to in subparagraph 5 i shall be inspected and maintained by a competent worker before each use to ensure that there is no air leakage, and if the filter is found to be damaged or defective, it shall be replaced before the ventilation system is used. 7. The shower room in the decontamination facility shall, i. be provided with hot and cold water or water of a constant temperature that is not less than 40° Celsius or more than 50° Celsius, ii. have individual controls inside the room to regulate water flow and, if there is hot and cold water, individual controls inside the room to regulate temperature, iii. be capable of providing adequate supplies of hot water to maintain a water temperature of at least 40° Celsius, and iv. be provided with clean towels. 8. When leaving the work area, a worker shall enter the decontamination facility and shall, in the following order, i. decontaminate his or her protective clothing by using a vacuum equipped with a HEPA filter, or by damp wiping, before removing the protective clothing, ii. if the protective clothing will not be reused, place it in a container as described in paragraph 5 of section 15, iii. shower, and iv. remove and clean the respirator. 9. If practicable, existing electrical power distribution systems that are not water-tight shall be de-energized and locked out where wet removal operations are to be carried out. 10. Temporary electrical power distribution systems for tools and equipment involved in wet removal operations shall be equipped with ground fault circuit interrupters. 11. Friable asbestos-containing material shall be thoroughly wetted before and during removal, unless wetting would create a hazard or cause damage. 12. The work area shall be inspected by a competent worker for defects in the enclosure, barriers and decontamination facility, i. at the beginning of each shift, ii. at the end of a shift if there is no shift that begins immediately after the first-named shift, and iii. at least once each day on days when there are no shifts. 13. Defects observed during an inspection under paragraph 12 shall be repaired immediately and no other work shall be carried out in the work area until the repair work is completed. 14. If practicable, dust and waste shall be kept wet. 15. On completion of the work, i. negative air pressure shall be maintained if required by subparagraph 5 i, ii. the inner surface of the enclosure and the work area inside the enclosure shall be cleaned by a thorough washing or by vacuuming with a vacuum equipped with a HEPA filter, iii. equipment, tools and other items used in the work shall be cleaned with a damp cloth or by vacuuming with a vacuum equipped with a HEPA filter or they shall be placed in a container as described in paragraph 5 of section 15 before being removed from the enclosure, and iv. a visual inspection shall be conducted by a competent worker to ensure that the enclosure and the work area inside the enclosure are free from visible dust, debris or residue that may contain asbestos. 16. Once the work area inside the enclosure is dry after the steps set out in subparagraphs 15 ii, iii and iv have been completed, clearance air testing shall be conducted by a competent worker in accordance with subsection (5), unless the operation is carried on inside a building that is to be demolished and will not be entered by any person except the workers involved in the operation and the workers involved in the demolition. 17. The barriers, enclosure and decontamination facility shall not be removed or dismantled until, i. cleaning has been done as described in paragraph 15, and ii. if clearance air testing is required, it has been completed and the work area inside the enclosure has passed the clearance air test.  O. Reg. 278/05, s. 18 (4). (5) The following rules apply to clearance air testing: 1. Sample collection and analysis shall be done, i. using the phase contrast microscopy method, in accordance with subsection (6), or ii. using the transmission electron microscopy method, in accordance with subsection (7). 2. If the work area inside the enclosure fails the clearance air test, the steps set out in subparagraphs 15 ii, iii and iv of subsection (4) shall be repeated and the work area shall be allowed to dry before a further test is carried out, unless paragraph 6 of subsection (6) applies.  O. Reg. 278/05, s. 18 (5). (6) Clearance air testing using the phase contrast microscopy method shall be carried out in accordance with U.S. National Institute of Occupational Safety and Health Manual of Analytical Methods, Method 7400, Issue 2: Asbestos and other Fibres by PCM (August 15, 1994), using the asbestos fibre counting rules, and shall comply with the following requirements: 1. Testing shall be based on samples taken inside the enclosure. 2. Forced air shall be used, both before and during the sampling process, to ensure that fibres are dislodged from all surfaces inside the enclosure before sampling begins and are kept airborne throughout the sampling process. 3. At least 2,400 litres of air shall be drawn through each sample filter, even though the standard mentioned above provides for a different amount. 4. The number of air samples to be collected shall be in accordance with Table 3. 5. The work area inside the enclosure passes the clearance air test only if every air sample collected has a concentration of fibres that does not exceed 0.01 fibres per cubic centimetres of air. 6. If the work area inside the enclosure fails a first test that is done using the phase contrast microscopy method, the samples may be subjected to a second analysis using transmission electron microscopy in accordance with the standard mentioned in subsection (7). 7. When a second analysis is done as described in paragraph 6, the work area inside the enclosure passes the clearance air test only if every air sample collected has a concentration of asbestos fibres that does not exceed 0.01 fibres per cubic centimetre of air.  O. Reg. 278/05, s. 18 (6). (7) Clearance air testing using the transmission electron microscopy method shall be carried out in accordance with U.S. National Institute of Occupational Safety and Health Manual of Analytical Methods, Method 7402, Issue 2: Asbestos by TEM (August 15, 1994), and shall comply with the following requirements: 1. Testing shall be based on samples taken inside the enclosure and samples taken outside the enclosure but inside the building. 2. Forced air shall be used inside the enclosure, both before and during the sampling process, to ensure that fibres are dislodged from all surfaces before sampling begins and are kept airborne throughout the sampling process. 3. At least 2,400 litres of air shall be drawn through each sample filter, even though the standard mentioned above provides for a different amount. 4. At least five air samples shall be taken inside each enclosure and at least five air samples shall be taken outside the enclosure but inside the building. 5. Sampling inside and outside the enclosure shall be conducted concurrently. 6. The work area inside the enclosure passes the clearance air test if the average concentration of asbestos fibres in the samples collected inside the enclosure is statistically less than the average concentration of asbestos fibres in the samples collected outside the enclosure, or if there is no statistical difference between the two average concentrations.  O. Reg. 278/05, s. 18 (7). (8) Within 24 hours after the clearance air testing results are received, (a) the owner and the employer shall post a copy of the results in a conspicuous place or places, (i) at the workplace, and (ii) if the building contains other workplaces, in a common area of the building; and (b) a copy shall be provided to the joint health and safety committee or the health and safety representative, if any, for the workplace and for the building.  O. Reg. 278/05, s. 18 (8). (9) The owner of the building shall keep a copy of the clearance air testing results for at least one year after receiving them.  O. Reg. 278/05, s. 18 (9).