Asbestos abatement technical specifications, 130 Cedar Street, July 2004

NYC 9/11 Public Portal Document

Asbestos Abatement Technical Specifications For 130 Cedar Street, New York, NY 8. Provisions shall be made to ensure a safe and adequate air supply to • affected building(s). All vents, skylights, air intakes, windows and doors opening onto the roof, and all other openings are to be sealed with 2 layers of 6-mil plastic or fitted with HEPA-filters where appropriate. In lieu of sealing vents, air intakes, etc., with 2 layers of plastic or HEPAfilters, temporary extensions may be installed to a height of 10 feet to ensure adequate air exchange. Drains may be equipped with 5 micron filtering systems in lieu of being sealed.

9. Prior to actual removal, the built-up roofing and flashing shall be blanketed and wetted with a minimum (1) inch coating of the acceptable foam or viscous liquid that shall be maintained for the duration of the removal until the material is bagged. The foam or viscous liquid shall be confined to the work area. The foam or viscous liquid shall:

a. Be non-toxic and shall not require special respiratory protection for handling b. Wet the asbestos containing roofing material (ACRM) and remain wet through the bagging process. c. Leave an identifiable color residue when it dissipates d. Not require special disposal

10. Manual methods of removal are recommended, however if hand-held power tools are used to drill, cut into, or otherwise disturb the ACRM, • the power tools shall be equipped with HEPA-filtered local exhaust ventilation and operated to prevent potential fiber release.

11. Portable HEPA-vacuum machines shall be available during abatement.

12. After ACM removal and bagging, the bagged waste shall be HEPA- vacuumed then wet cleaned and transferred Into the shower room for double bagging. The double-bagged waste shall be transferred outside the clean room for its final transfer' for storage in an enclosed waste container.

13. Upon completion of the abatement in roof work area, clean-up procedures shall Involve removal and bagging of the following:

a. ACRM b. Visible accumulations of Asbestos Containing Waste (ACW) c. All excess foam or similar viscous liquid d. All debris to be followed by a thorough wet cleaning. e. All tools shall be wet cleaned and HEPA-vacuumed and removed from the work area upon completion.

14. The work area shall be allowed to dry completely before the visual inspection is conducted. The inspection shall confirm the absence in the work area of: 40 a. ACM or ACW bags or debris

Prepared by JLC Environmental Consultants, Inc. Project No. 04-3271 Page 43

NYC-WTC 000125621