Glove Bagging in an Occupied Office with a Return-Air Plenum
A property manager of a 20-story office building has 40 linear feet of asbestos-containing pipe insulation in a tenant suite. The tenant will remain open during the work. The abatement contractor proposes to use glove bags during business hours, with a HEPA vacuum and keeping people out of the immediate area by placing cones. The contractor says no DEQ notification is needed because glove bagging is a maintenance activity and the pipe is above a suspended ceiling. The building's HVAC return plenum is in the same ceiling cavity, and the tenant has complained about dust before. The contractor has a DEQ license and certified workers, but the proposal includes no critical barriers and no negative pressure. The property manager wants the work done in two days.
1. Is DEQ notification required? Does glove bagging change the answer?
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Yes. Forty linear feet of asbestos pipe insulation is far above Oregon's 3-linear-foot threshold. Glove bagging is a removal method, not an exemption. The contractor's maintenance-activity argument fails because the work is a planned removal of a known ACM pipe run, not incidental maintenance. A notification must be received by DEQ at least 10 working days before the work. The notification should describe the glove-bag method, the amount, and the containment. If the contractor tries to split the job into small segments to stay under the threshold, DEQ would treat that as circumvention; the project amount is the total contiguous removal.
2. What controls are needed in an occupied office with a return-air plenum?
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Cones and a HEPA vacuum are not enough. The work area must be isolated from the tenant with critical barriers; the return-air plenum must be sealed or the HVAC system shut down so fibers cannot be drawn into the building. The contractor should maintain negative pressure with HEPA-filtered exhaust, post warnings, and restrict access to certified workers. Glove bags may be used only for appropriate pipe sections and must be sealed to the pipe, wetted, and collapsed without ripping; fittings and damaged insulation may need full containment. Workers need respirators and protective clothing under Oregon OSHA. The contractor should perform a visual inspection after each shift and a final visual inspection; air monitoring and clearance should be specified in the contract and may be required by the building owner or Oregon OSHA.
3. What should the property manager require before the tenant reoccupies the space?
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The manager should require a completion notice, a final visual inspection showing no residue or dust, and clearance air sampling if specified or if the containment was compromised. The tenant should be informed in advance of the schedule and any HVAC shutdown. The manager should verify the contractor's DEQ license and worker and supervisor certifications, the DEQ notification, and waste disposal records. If the glove bags leak, or if insulation falls outside the bag, the work should stop and the area should be recleaned and re-inspected. The manager should not rely on no visible dust alone in a return-air plenum; sealing the plenum and negative pressure are the key controls.