EPA work plan review, 133-135 and 21-23 buildings, August 2005

NYC 9/11 Public Portal Document

Part I: Work Plan — Decontamination/Deconstruction 133-135 Greenwich Street and 21-23 Thames Street Airtek Project 05-0701— Rev 2 August 10, 2005

Copper 500 ug/m3 Lead 25 ug/m3 Manganese 100 ug/m3 Mercury 12.5 ug/m3 Nickel 50 ug/m3 Zinc 1,000 ug/m3 e ms °

5 inside work area (IWA) samples and 5 outside work area (OWA) for ACM will be collected from each floor of the subject buildings. In addition, 5 IWA samples for metals will be collected form each floor. All samples will be collected using aggressive sampling techniques. Upon completion of clearance sampling on the top floor, the floor will be sealed off, and sampling of the next floor down will commence. Details on sampling methodologies are included in the ECAMP document (submittal Part II).

7.0 Abatement Phase

7.1 Part I - Exterior Cleaning:

The exterior of the building was decontaminated as a part of the NYC DEP Building Exterior Cleaning Program following 9/11/01. Airtek's visual inspection of the fagade indicates that it is advisable to conduct low-pressure power washing prior to initializing demolition activities. The exterior of the building will be cleaned in accordance with the NYC DEP WTC Dust/Residue Roof & Façade Cleaning Procedures included in Attachment I.

Building fagade clean-up via low pressure washing:

1. At grade level, a work place/restricted area shall be established. This area shall be plasticized with one (1) layer of 6-mil plastic from one (1) foot up the building exterior wall to the edge of the sidewalk. At the edge of the sidewalk, wood shall be placed under the plastic to create a large catch basin for the water run-off. It shall be cordoned off with clearly identifiable asbestos hazard tape. C— ?

2. A low pressure washing technique, moving from top to bottom, 10 c

shall be employed to minimize water bounce-back. The fagade 0 shall be washed with a low pressure wash not to exceed 250 psi. booms 11T 3. The collected water run-off shall be pumped to 55-gallon drums. The first drum of water generated will be TCLP sampled for RCRA characteristics. If the water is not regulated under RCRA, it will be filtered through a 5 micron filter prior to disposal to the NYC sewer system per NYC Title 15, Part 1-82 (b) 1. This-was-the et. If testing indicates the water is regulated under RCRA, it will be handled, package, stored and disposed in strict accordance with its categorization.

NYC-WTC 000134889