E-mails 2003 M. Gilsenan

NYC 9/11 Public Portal Document

‘ 17. Prior to dismantling work area preparations, clean interior walls of temporary containments using wet-wiping or HEPA vacuum methods.

18. Occupied areas or common areas in which fan unit cleaning is accomplished, will be cleaned as common spaces using the common space unit prices, immediately after the HVAC cleaning is complete.

19. Place waste and debris into 6 mil polyethylene bags for disposal as asbestos-containing waste.

20. Perform all duct cleaning work in accordance with local, state and federal regulations.

21. All work will be accomplished by DEP certified Asbestos Handlers.

22. All work will be supervised by a DEP certified Asbestos Handler Supervisor.

23. All work will be overseen by a NADCA certified ASCS or equivalent.

24. Workers will utilize '/a face APR’s equipped with P-100 filters, eye protection and full body coveralls during the cleaning process.

25. In most cases minimal dust accumulations were observed on components and the system has been in operation for over a year, large amounts of debris are not expected during dismantling of the system components. All specified cleaning is being performed after the installation of negative pressure ventilation equipment and system isolation devices. The existing dust/debris conditions and required engineering controls for the cleaning indicate that personal air samples are not expected to exceed 0.1 f/cc. The cleaning contractor shall collect personal air samples on workers and submit the results of sampling within 48 hours. Based on the above, the work area will not be considered as regulated area. In the event large accumulations of dust/debris are observed during the work or personal air samples exceed 0.1 f/cc work practices and engineering controls will be reevaluated and revised accordingly.

NYC-WTC_000162742