Law Department notice on WTC document preservation, Oct 2001

NYC 9/11 Public Portal Document

5. Interior Cleaning:

EPA will evaluate eight cleaning techniques on fifteen (15) rental spaces. Each cleaning technique will be tested on two rental units. The eight cleanup techniques will vary through use of different vacuuming systems. Sampling of dust before, during, and after the cleanup will be performed to evaluate the effectiveness of each cleanup technique and worker exposure.

General cleaning procedures which will be employed for all units are as follows: Bulk accumulations of dust and debris (if present) will be manually removed using shovels and commercial quality HEPA-filtered vacuums. All horizontal and vertical surfaces will be vacuumed beginning with the ceilings and working down along the walls to the floor. Windows, electrical outlets, sills, heating/cooling units will be vacuumed as they are encountered. Filters will be replaced on cooling units. After cleaning, A/C units will be sealed with plastic sheeting. Central HVAC intake/discharge registers will be covered with plastic. Horizontal and vertical solid surfaces including floors, appliances, table tops, cabinets (interior/exterior) as well as flat ware, and accent items will be washed with soap and water (if appropriate). Books, files, magazine, porous accent items will be vacuumed and stored in boxes then covered with plastic bags. Items such as clothes, shoes, drapes/curtains, will be HEPA vacuumed (if necessary) and stored in plastic bags for washing/diy-cleaning by the tenant. Carpets and furniture will be dry vacuumed until visibly clean. The tenant will be invited to monitor the cleanup if desired. EPA will furnish protective equipment to tenant(s) during the cleanup. No items will be discarded unless authorized by the tenant. If necessary, work schedules will be modified to accommodate the tenant.

Detailed cleaning procedures and sequencing of work are included as Attachment A,

Four scenarios have been developed to evaluate eight cleanup techniques. Each scenario contains two parts for testing two different cleaning procedures. Each scenario is discussed below:

Scenario 1: (Selection Criteria): Accumulation of dust on horizontal surfaces should be limited to a dusting. This scenario may represent a typical apartment which was impacted but not totally encompassed in dust.

Test A (Equipment Selection) Cleaning will be conducted in two units using basic residential quality upright vacuums and shop vacuums which are available from Hoover®, Eureka®, Rigid® and Craftsman®.

Test B (Equipment Selection) Cleaning will be conducted in two units with basic vacuums as used in Test A but with the addition of an air filtration device (AFD). The AFD produces a negative pressure differential which will serve to capture dust particles through HEPA filtration that become airborne as a result of the cleaning activities.

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