Asbestos abatement technical specifications, 130 Cedar Street, July 2004

NYC 9/11 Public Portal Document

Asbestos Abatement Technical Specifications For 130 Cedar Street, New York, NY c) Two (2) samples inside the uncontaminated entrances of each worker • and waste decontamination unit.

d) Two (2) samples in adjacent non-work areas. If no such areas exist, an exterior sample (outside the building) shall be taken.

e) It is also highly recommended that exterior samples be taken to document outside air fiber levels if conditions permit.

f) Minimum volume required to be drawn on area samples is 560 liters. This minimum requirement may be altered if required, by filing for a variance with the NYC DEP. This should be done in the event of high concentrations of particulates, other than asbestos, in the air.

3.3 The indoor air samples taken on a work site shall be considered representative of the building occupants breathing zone.

3.4 Personal air sample results shall be considered representative of the workers inside the work area containment..

3.5 Air sampling equipment shall not be placed in comers or near any obstructions such as furniture or air handling systems that may unduly affect airflow.

3.6 All samples shall have a chain of custody to record who collected, • transported, received and analyzed samples.

3.7 Air sample analysis shall be carried out in accordance the NIOSH 7400 Method (Revised) utilizing counting Method W.

3.8 All applicable requirements for quality assurance and quality control In the laboratory must be in place in order to ensure the accuracy of the analysis results.

4.0 Final Clearance Air Monitoring

4.1 Sampling should commence a minimum of one (1) hour after the area is completely dry. No visible pools of water or condensation shall be present during final air clearance testing.

4.2 A minimum of five (5) samples inside and five (5) samples outside of each work area shall be collected. Samples shall be collected in a random fashion inside the work area. The equipment shall be placed so as to obtain a representative sample of the entire work area.

4.3 Samples collected outside the work area, but within the building, shall also be placed in a manner to get the best possible representation of outside air. Placing the samples at a distance of at least fifty (50) feet from all barriers will insure that any air that may escape from the isolation barriers will not affect these samples.

Prepared by JLC Environmental Consultants, Inc. Project No. 04-3271 Page 60

NYC-WTC 000125638