Air Monitoring Scope Request, WTC Site, Aug 2002

NYC 9/11 Public Portal Document

3. Wipe samples shall be collected before and after cleaning for lead, mercury, dioxin, and PAHs.

Prior to the cleaning activities, three wipe samples shall be collected for each of these parameters in each apartment. The sampling locations shall be a wall, a bare floor, and a counter or tabletop.

After cleaning activities, three wipe samples shall be collected for each of these parameters in each apartment. The sampling locations shall be a wall, a bare floor, and a counter or tabletop.

4. The required sampling and analytical procedures are specified in Table 1.

Table 1: Sampling and Analytical Methods Parameter Description Sampling Methodology Analytical Method Lead Wipe samples HUD Appendix 13.1 EPA Method SW-846-6010B PAHs Wipe samples ASTMD6661-01 ASTM-6661-01 EPA SW-846-8270C Dioxin Wipe samples ASTM 6661-01 ASTM 6661-01 EPA Method SW-846-8290 Fibrous Glass Air samples NIOSH 7400 EMSL MSD.0300_________ Crystalline Silica Air samples NIOSH 7500 NIOSH 7500 (XRD)_______ Mercury Wipe samples HUD Appendix 13.1 EPA Method SW-846 7471A

Asbestos Air Sampling Analysis

1. All asbestos air samples collected during clean-up activities shall be analyzed via TEM. The method of analysis and sampling methodologies shall be in accordance with the applicable sections of Title 15, Chapter 1 of the Rules of the City of New York.

2. A turnaround time of 24 hours is required for all samples.

3. Asbestos clearance air samples shall be analyzed in accordance with the NIOSH 7400 Method, Counting Rule “A”. The remaining portion of the filter shall be analyzed in accordance with the AHERA Method. The laboratory shall record fibers greater than 5 pm in length. The PCMe value shall be calculated and reported.

Asbestos Air Monitoring

1. Ata minimum, five (5) TEM samples shall be collected per day 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 during clean up activities shall be in accordance with Title 15, Chapter 1 of the Rules of the City of New York (RCNY) regarding documentation, sample locations, rate of flow, and required volumes to achieve the necessary analytical sensitivity.

3 of 5

NYC-WTC_000163375