NYC-WTC_000233286

NYC 9/11 Public Portal Document

(vi) Final Clearance Air Samples. After the final cleaning and visual inspection requirements and are completed and the final settling/drying period is observed, prior to dismantling the enclosure. Phase I IC final clearance air samples shall be collected and satisfactory clearance air results obtained as per Section 56- 9.2 of this Part.

56-8.7 Encapsulation Procedures. All material used for repair or encapsulation of asbestos material shall have a flame spread rating, fireproofing and smoke characteristics similar to the material being repaired or encapsulated. Also, the encapsulant shall not alter the insulating characteristics of the material subject to encapsulation, and the encapsulant shall not add excess weight to the material increasing the potential that the material may delaminate from itself (cohesion failure), or from its substrate (adhesion failure). Encapsulation of asbestos material shall be conducted in accordance with the following:

(a) Regulated Abatement Work Area Preparation. The regulated abatement work area shall be pre-cleaned, isolated and negative air established in accordance with Subpart 56-7 of this Part.

(b) Repair Materials. Damaged and missing areas of existing materials shall be repaired with non-asbestos material. The material shall adhere to existing surfaces and provide a base for application of encapsulating agents.

(c) Asbestos Material Removal. Loose or hanging ACM, PACM or asbestos material shall be removed in accordance with the requirements of Section 8.4 of this Subpart.

(d) Testing of Encapsulants. Encapsulants shall be field tested prior to use by applying each to a small area to determine suitability for the material to be encapsulated. Testing shall be conducted only after the isolation barriers are in place and negative air has been established.

(e) Bridging Encapsulants.

(1) Thickness Requirements. Bridging encapsulants shall be applied to provide the manufacturer’s specified minimum dry-film thickness over sprayed asbestos surfaces.

(2) Color Requirement. When using bridging encapsulant, a different color for each coat shall be used.

(f) Latex Paint. Latex paint shall not be used as a bridging encapsulant. It shall be considered a dilute lockdown encapsulating agent and used only as a coating for lockdown purposes for surfaces during cleanup procedures as per Subpart 56-9.

(g) Penetrating Encapsuiants.

12 NYCRR56 Subparts, Page 81

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