WTC residential environmental sampling plan draft, Oct 2001

NYC 9/11 Public Portal Document

peanlne Pmdtwrhrhe y^c residernjal sampling"pian.wpd Page 10

X. Sample Description Needs:

In order to interpret results, the following information should accompany each area sampled:

1. Reason for selection of site for sampling (e.g., apartment had windows open during WTC event; visible dust present in ambient air adjacent to apartment building)

2. Description of sample location Physical address Apartment/floor number Side of building (N, S, E, W) Main entryway

3. For indoor sample locations, provide the following: Has area been cleaned since WTC event? If so, description of cleaning wet mopping dusting sweeping (Broom, vacuum, HEPA vacuum) carpets washed Is visible dust present? If so, describe

4. For entryway sampling locations (e.g., lobbies) Is there evidence of dust track-in from outdoors Same questions as #3

5. For outdoor sampling, provide the following: Location of samples relative to main entryways of residential buildings Side of budding (N, S, E, W) Location of samples relative to roadways Is visible dust present (air, surfaces) If so, describe

6. Description of HVAC system Single or multi-unit system (if multi-unit, how many?) Location of HVAC air handling unit (e.g., in each unit, on roof-top) Description of conditions around HVAC air handling unit (e.g., heavy dust, no apparent dust) Filter type (e.g., electrostatic) Filter condition (visible dust present?) Has it been in use since the WTC event? If so, is it recirculating air or drawing from the outside?

10

NYC-WTC_000176050