Memo on retention of WTC clean-up records, September 2003

NYC 9/11 Public Portal Document

CARPET REMOVAL PROTOCOL Note: All work as outlined in this protocol is to be performed by a NYS DOL licensed asbestos abatement contractor using US EPA / NYC DEP certified asbestos abatement personnel.

1. Shut down the ventilation and air-conditioning (HVAC) system(s) for the room.

2. Remote personal/waste decontamination unit(s) will be constructed and located adjacent to the area.

3. All penetrations that can be reached using an 8 foot ladder (such as windows doorways, supply air diffusers, . return air grilles etc.) shall be sealed with 2 layers of 6 mil plastic sheeting sealed with tape.

4. A thorough visual inspection will be performed by a third party consultant to verify that all required engineering controls are in place and work correctly.

S. Pre-clean and remove any furniture (that is not stationary) and associated floor surfaces twice using HEPA filtered vacuum equipment. After the furniture and associated floor surfaces have passed a thorough visual inspection, all removable objects shall be covered with two layers 6 mil plastic sheeting and sealed with tape, and the removable objects shall be removed.

6. All carpeted floor surfaces shall be saturated with an approval lock-down encapsulate and then covered with two layers 6 mil plastic sheeting sealed with tape.

7. The plastic covered carpet shall be continually misted with amended water while it is being cut into manageable sections and rolled up. When a section of carpet has been rolled up, it shall be misted with amended water and sealed with two layers 6 mils plastic sheeting. The sealed carpet section shall be transported out of the facility to an approved waste container for appropriate disposal.

8. After all carpeting has been removed, all surfaces shall be cleaned using wet methods and HEPA vacuum.

9. The two layers of 6 mil plastic sheeting covering all penetrations and stationary furniture shall remain in place until the area has undergone general cleaning and passed a visual inspection.

AIR MONITIORING PROTOCOL

1. Inside work area air samples will be collected during cleaning and carpet removal phases of the project to evaluate any asbestos fiber release from the work area These samples analyzed via TEM (AHERA PROTOCOL).

2. If the air samples collected during cleaning/removal activities exceed AHERA clearance criteria, the area will be re-cleaned, and aggressive air monitoring will be performed and samples will be analyzed be TEM.

NYC-WTC 000144560