NYC 9/11 Public Portal Document
WTC-LBC
Scope of Work Items
Item (11) Page 2: Add the following sentence to the end of the item:
After installation of the isolation barriers, floors shall be covered with a layer of 6-
mil polyethylene sheeting.
Item (13) Page 2: Add phrases to sentences two and three so that they read:
Interior and perimeter walls shall be removed, as well as insulation behind those
walls, to access the interstitial spaces for cleaning. Only one side of each wall shall
be removed, from floor to ceiling, to access the space.
Item (19) Page 4: Add the following sentences to the end of the item:
The polyethylene sheeting covering the floors shall be cleaned and folded inward
onto itself. All floor surfaces shall then be fine cleaned using HEPA vacuuming
and wet-wiping procedures.
WTC-LBA
Sampling and Analytical Procedures for Lead, PAHs, Dioxin, Fibrous Glass, and Silica
Item 2, Page1: Add the clarification for sampling the duplex apartment at both
prior to and after cleaning activities.
Prior to the cleaning activities, three wipe samples shall be collected for each of
these parameters in each apartment, except the duplex apartment where three wipe
samples shall be collected on each floor of the apartment.
After cleaning activities, three wipe samples shall be collected for each of these
parameters in each apartment, except the duplex apartment where three wipe
samples shall be collected on each floor of the apartment.
NYC-WTC 000102601
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