Revised scopes of work for WTC indoor cleaning and monitoring,

NYC 9/11 Public Portal Document

Scope of Work B

Application: A visual inspection was performed and the presence ofaccumulations ofdebris (including large or significant amotmts of dust) fi-om the collapse of the WTC was identified by EPA or designee.

In some unique circumstances, Scope B maybe applied on a limited basis within a unit as determined necessaiy by the Monitoring Contractor in consultation with EPA. Residents may be present depending on these unit specific circumstances. In cases where clean up areas can be isolated by closing doors or by the erection ofcontainment barriers, the resident may be present in the unit. In all other applications of Scope B it is assumed that residents will not be present.

1. A site specific work plan will be prepared for review and approval by EPA priorto the start ofwork. This work plan will include detailed procedures for the removal ofdust and debris and the cleaning.

2. An ACP-7 form asbestos project notification form shall be submitted, as required by Title 15, Chapter I oftheRCNY, directly to the NYC DEPAsbestos Control Program prior to the start of work. NYS DOL notification shall be submitted.

3. At least one asbestos supervisor shall be present at each work place (work place is defined in Title . 15, Chapter 1 RCNY as the work area and the decontamination enclosure system).

4. Personal protective equipment including disposable clothing, gloves, and respirators shall be worn during this clean-up activity in accordance with OSHA rules and regulations.

5. Warning signs shall be posted at the approach to the work area.

6. A worker decontamination enclosure system shall be installed at the entrance to the work area. A remote decontamination enclosure system shall be considered when appropriate i.e. inability to comply with the provision due to space limitation or other agency rules, such as for compliance with NYCFD egress requirements.

7. HVAC systems shall be shut down and locked out or isolated locally. The site specific work plan shall provide additional information on the HVAC system and proposed procedures for shutdown or isolation.

8. Isolation barriers shall be installed with two layers of6-mil polyethylene sheeting and sealed with tape.

9. Negative pressure ventilation equipment shall be installed and operated during all clean-up activities. Equipment shall run continuously until clearance air monitoring. A minimum ofone air change every 30 minutes shall be provided. When ducting to the outside is not possible, a second negative pressure ventilation unit compatible with the primary unit capacity may be connected in series.

NYC-WTC_000138730