Law Department notice on WTC document preservation, Oct 2001

NYC 9/11 Public Portal Document

Scenario 2: (Selection Criteria) Same or similar to Scenario 1.

Test A (Equipment Selection) Cleaning will be conducted in two units using HEPA-filtered upright vacuums and HEPA-filtered shop vacuums which are available from Hoover®, Eureka®, Rigid® and Craftsman® companies. The upright vacuums from Hoover® and Eureka® were provided to residents of lower Manhattan, by FEMA and the American Red Cross for cleaning of their occupied space.

Test B (Equipment Selection) Cleaning will be conducted in two units using the same vacuums in Test A but with the addition of an AFD.

Scenario 3: (Selection Criteria): Same or similar to Scenario 1.

Test A (Equipment Selection) Cleaning will be conducted in two units using commercial quality HEPA-filtered vacuums. These vacuums will be purchased from Nilfisk-Advance™ Vacuum Systems. Vacuums of this type were used by management companies for cleaning residential/commercial spaces in lower Manhattan after the WTC attack.

Test B (Equipment Selection) Cleaning will be conducted in two units using the same vacuums in Test A but with the addition of a AFD.

Scenario 4: (Selection Criteria) Units have a direct exposure to ground zero. Windows were blown out as a result of the WTC collapse. Accumulation of dust on horizontal surfaces measures in inches. This scenario represents a severely impacted space with heavy accumulations of dust and debris. The two commercial spaces (Units 1 and Unit 2) in the building fit this criteria. Both spaces have wall to wall carpeting and acoustical ceiling tiles.

Test A (Equipment Selection) Cleaning will be conducted in both units using Nilfisk™ HEPA- filtered vacuums. Debris that caimot be vacuumed will be manually removed and disposed of. Due to the excessive amount of dust, a minimum of two AFDs will be used to control airborne dust. Cleaning will continue until all visible dust has been removed.

Test B (Wet Wiping) Additional cleaning of wall surface areas will be conducted to remove any dust residues that may not have been removed by vacuuming. Wiping of the walls with a damp soapy cloth will be performed to remove residual dust that may have adhered to the walls from the force of the collapse.

Test C (Carpet Shampooing) Wall to wall carpeting in both units will be shampooed or steam cleaned using commercial duty equipment.

Scenarios 1,2 and 3 will be each be tested on four units. Scenario 4 will be tested on the two commercial spaces. Additional evaluation of wet wiping methods will be conducted on the 15* (Dwelling) that has not been proposed for evaluation under the previously proposed scenarios.

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