Receiving report for HVAC consulting services, March-April 2003

NYC 9/11 Public Portal Document

the system, so that sufficient Use isolation/zone pillows as necessary to isolate sections of -contamination of 3 negative pressure is maintained in each work zone and to prevent re cleaned sections. grille and cover again with After cleaning, reinstall the bathroom or kitchen exhaust pressure polyethylene sheeting secured with painter's tape to help maintain negative HEPA vacuum within the exhaust ventilation system before moving on to the next grille. containment prior to dismantling or or wet-wipe interior surfaces of the temporary measure moving to another location. Cleaning of the containment is a precautionary work area. intended to minimize the potential for spreading dust or debris outside of the waste. Place all waste in 6 mil polyethylene bags for disposal as asbestos-containing debris that has fallen 14. Clean the bottom of the riser using a HEPA vacuum to collect any to the bottom. section of the riser or to 15. Disengage the local capture system and relocate to another another riser. associated with the duct cleaning 15. Ensure that the occupant space is free of any debris needed. Place process. Use HEPA vacuums and/or wet wiping to clean the space, as waste. waste and debris into 6 mil polyethylene bags for disposal as asbestos-containing waste -containing Waste and debris from cleaning operations will be handled as asbestos as a precaution. state and federal regulations. 16. Perform all duct cleaning work in accordance with local, Handlers. 17. All work will be accomplished by a DEP certified Asbestos Handler Supervisor. 18. All work will be supervised by a DEP certified Asbestos filters, eye protection and full 19. Workers will utilize Mace APR's equipped with P-100 body coveralls during the cleaning process. components and the system 20. In most cases minimal dust accumulations were observed on are not expected during has been in operation for over a year, large amounts of debris is being dismantling and cleaning of the system components. All specified cleaning and system performed after the installation of negative pressure ventilation equipment indoor dust isolation devices. To date, none of personal air samples collected during the personal monitoring results cleaning program exceeded 0.1 f/cc asbestos. Based on past previous residential which was conducted during Scope A and Scope B cleanings, cleaned and the required engineering monitoring, the condition of the systems to be thereby keeping it controls which contain and move dust within the ventilation system personal air samples away from the workers breathing zone, it is reasonable to expect that area will not be considered as will not exceed 0.1 f/cc. Based on the above, the work as regulated regulated area. Based on the above, the work area will not be considered workers and submit area. The cleaning contractor shall collect personal air samples on exposure data for this work. the results of sampling within 48 hours to establish personal the work or personal air If large accumulations of dust or debris are observed during controls will be reevaluated and samples exceed 0.1 f/cc work practices and engineering revised accordingly.

NYC-WTC 000135781