NYC-WTC_000200222

NYC 9/11 Public Portal Document

5 AMBIENT AIR AND DUST SAMPLING PROTOCOL for H.S. of Economics and Rnance Page 2 of 8

• Outside by main enfrance - 2 samples (one sample from 8am-12pm & one from 12pm- 4pm) • Stair case B (open stair case) T” Floor landing - 2 samples (one sample from 8am-12pm & one from 12pm-4pm) • Roof - 2 samples (one sample from 8am-12pm & one from 12pm-4pm)

The duration of all ambient air sample shall be approximately 4 hours. The total air volume sampled at each location shall be approximately 1800 liters.

All ambient air samples collected shall be analyzed via Transmission Electron Microscopy (TEM) in accordance with the methodology of the AHERA Final Rule.

Results from samples collected each day shall be reported verbally, no later than 8am the next day, to BOE, UFT, School Principal and the PA consultant. A written report shall be delivered or faxed by the end of the day. Unsatisfactory results (>70 s/mm^ shall be reported immediately.

In the event that any one sample result exceed 70 s/mm^ BOE will immediately notify the LIFT, the school principal, the school custodian and the PA consultant. The said parties will assess the situation and implement the appropriate response action(s).

INDOOR AIR QUALITY

To address lAQ concerns, each day from Monday through Friday, during school hours, the following shall be performed:

• A visual inspection to assess conditions present in the school at the time of the site visit.

Collect approximately 100 real-time environmental measurements of temperature (T>

• Collect approximately 100 real-time environmental measurements of relative humidity (RH)

• Collect approximately 100 real-time environmental measurements of carbon dioxide (CO2)

• Collect approximately 100 real-time environmental measurements of carbon monoxide (CO)

• Collect approximately 100 real-time environmental measurements of total volatile organic compounds (TVOCs)

• Collect approximately 100 real-time environmental measurements of respirable particulates (PM2.5).

EVALUATION CRITERIA:

CITY_21MC100_003267221

NYC-WTC_000200223