NYC-WTC_000233286

NYC 9/11 Public Portal Document

work shift. Area air samples must be collected with a minimum flow rate capacity of two (2) liters per minute and a maximum flow rate consistent with the applicable accepted air sampling and analysis methodology. The flow rate for each air sample shall be pre-calibrated and post-calibrated at the beginning and end of each air sample collection. The calibrations shall be recorded. Primary and secondary calibration devices shall be calibrated as per NYS DOH EI_AP requirements. The air sampling technician shall be on-site to observe and maintain air sampling equipment for the duration of air sample collection.

(c) Placement of Air Sampling Equipment. Air sampling equipment shall be in place and operational as follows:

(1) Placement of Regulated Abatement Work Area Indoor Air Sampling Equipment. Air sampling equipment shall not be placed in corners of rooms or near obstructions. Samplers shall be placed randomly around the regulated abatement work area. If the regulated abatement work area contains a number of rooms equivalent to the number of required samples based on floor area, a sampler shall be placed in each room. When the number of rooms is greater than the required number of samples, a representative number of rooms shall be selected, but in no case shall fewer samples be collected than the required number of samples based upon floor area. (See Table 2 )

(2) Placement of Outdoor Air Sampling Equipment. Outdoor air sampling equipment shall be placed four (4) to six (6) feet above grade level and at least ten (10) feet away from obstructions that may influence wind patterns. If access to electricity and security concerns dictates a rooftop site, locations within ten (10) feet of vents or other structures on the roof shall be avoided.

(3) Samplers Outside of the Regulated Abatement Work Area. Air sampling equipment shall be placed outside the regulated abatement work area within ten (10) feet of the critical barriers, decontamination enclosure entrances/exits and negative air ducts and exhausts, as applicable. (See Table 2 )

56-4.8 Area Air Sample Analysis and Results - General Requirements.

(a) Turnaround Time. For project air samples collected during the asbestos project, the period of time permitted between completion of air sample collection and receipt of results on the job site shall be equal to or less than 48 hours.

(b) Microscope Detail. The methodology chosen for sampling, analysis, and the microscope type, make, and model number shall be included in the results.

(c) Sample Records. All project air samples shall have a chain of custody.

12 NYCRR56 Subpart 4, Page 37

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