Asbestos assessment report, 3 World Financial Center, Apr 2002

NYC 9/11 Public Portal Document

PRIVILEGED and CONFIDENTIAL Prepared at the Request of Counsel

comparable, with 48% of the The HVAC micro-vacuum sampling results were similarly concentrations reported samples from floors Lobby — 16 reported as present. The square centimeter. ranged from non-detect to 12,976,000 asbestos structures per

3.2 PCM Sampling

Method, utilizing Personal air monitoring was conducted following the NIOSH 7400 fiber samples were Phase Contrast Microscopy. Approximately 1,298 airborne for separate dust collected and analyzed to determine Initial exposure assessments, carpenters, and artwork disturbing activities conducted by general cleaners, electricians, determined for each and personal item retrieval personnel. A "negative" exposure was fibers per cubic of these activities as compared to the OSHA 8-hour TWA PEL of 0.1 centimeter (f/cc).

Safeway The emergency response cleanup on floors 3 — 26 was performed by Environmental, Inc., as described in the Asbestos Project Notification (ACP-7) filed with period of DEP and dated October 9, 2001. This work was completed during the October 9 to November 5, 2001. Emteque Corporation conducted air monitoring for these activities by sampling prior to work (baseline), during, and after completion of the work (clearance). A total of 575 air samples were collected and analyzed by PCM during these cleanup activities, which also included the set-back roof areas at Floors 4, 5, 10, 20, 26, 48, 51, and 52. None of the sample results were reported to be above the clearance criteria of 0.01 f/cc.

3.3 TEM Sampling

Following the general cleaning of a floor space by respiratory protected personnel, airborne asbestos samples were collected for analysis by TEM, following the AHERA methodology, per USEPA 40CFR Part 763, Final Rule. This "clearance" testing was performed by collecting a minimum of nine samples per floor, using aggressive sampling methods. The entire floor space of Floors 17 — 52 were cleared in this 7 April 18, 2002

NYC-WTC 000094864