NYC-WTC_000234592

NYC 9/11 Public Portal Document

Air Monitoring Requirements For 114 Liberty Street

Equipment Sampling equipment must be in sufficient quantity to provide the amount and type of samples required for this project. At a minimum the following equipment are required: air-sampling pumps with flow rate capacities of 2 to 10 liters per minute, tripods, rotometers, sample cassettes with mixed cellulose ester filters having pore size of 0.45|im(TEM).

Specifications It is anticipated that the work will be completed within three (3) weeks.

Air Sampling Analysis

All air samples shall be analyzed via TEM. The method of analysis and sampling methodologies shall be governed by New York City Department of Environmental Protection (NYCDEP) Title 15 and New York State Industrial Code Rule 56 (NYSICR 56). A turnaround time of 24 hours is required for all samples.

Air Monitoring

1. A minimum of five (5) samples per day is required during cleanup activities.

2. Samples shall be collected at isolation barriers outside the work area, the clean room of the worker/waste decontamination facility, and outside of the building.

3. Sample collection shall be in accordance with Title 15, Chapter 1 of the Rules of the City of New York (RCNY) and New York State Industrial Code Rule 56 regarding sample locations, rate of flow, and required volumes to achieve the necessary analytical sensitivity.

4. Sampling equipment shall be placed at representative locations and away from obstruction. Sampling cassette must be placed on a tripod and not taped to existing surfaces. All air sampling equipment shall be pre- and post- calibrated to insure accurate air sampling volumes.

5. The Air Sampling Technician shall perform clearance air sampling in accordance with Title 15, Chapter 1 of the RCNY after the areas are free of dust accumulations as determined by the Project Monitor. All surfaces must be completely dry prior to the start of sampling. Clearance air sampling shall be performed at each unit. A minimum 5 samples shall be collected on each floor. The elevator shaft and first floor commercial spaces shall be cleared separately. Clearance air monitoring shall be performed after the completion of all clean up activities at the work site.

6. The apartment will be re-cleaned and retested if the clean-up criterion of 70 structures/square millimeter (70 s/inm’ measured by TEM) is not achieved. This clean-up criterion may be reevaluated and revised, if determined necessary based on field conditions and analytical limitations.

Project Monitoring

2 of 1

CITY_21MC100_003242022

NYC-WTC_000234593