Air quality test reports cover letter, Jan 2002

NYC 9/11 Public Portal Document

9/2€/28i 10:14 6315803195 ENV I ROS(: I ENCE'.t6L.TAN PAGE 02

E.NV'IROSCIENCE CONSULTANTS, INC. 2150 SI*ITH'TOWN AVENUE RoNKoNKO,MA, NEW YORK i t 779-'y348 PHONE: (631) 580-3191 • FACSIMILE 1631) 560-3195 a.CALLAa$CA C. Qn-81mr, P: b*RMOor T.KUEPD. E. OE7wE,JLRR G. Nau$ewwEosw 28 September 2001 . ORtEQ~ l . MRwRc.a L. •BAVAwr9z Mr. Kenneth Coffey, President Tech0ear. 242-E Route 109 Farmingdale, Now York 11735 Phone: 631-454-9595 Facsimile: 631-454-9605

Subject: Air and Bulk Sampling Results for the American Stock Exchange 96 Trinity Place, 22 Thames, and 65 Broadway, New York. NY.

Dear Mr. Coffey:

Air and bulk sampling was conducted September 19a' , 20'", 21", 24th 2001 at the•.American Stock Exchange, 96 Trinity Place, 2.2 Thames; and 65 Broadway, New York, NY following the explosion, fire and collapse of the World Trade Center and adjacent. buildings. It was derided to collect samples ofthe following compounds based on an evaluatson of the conditions due to the explosion; fire and collapse of the World Trade Center. The substances collected included the following: asbestos (air and hulk), inspirable dust (mass & particle size distribution),• lead, polychlorinatedbipheunyls, polynuclear aromatic hydrocarbons. The substances, sampling protocol, and standards employed were discussed with D. Marl:. Maddoloni the Toxicologist assigned to the World Trade Center site by US EPA: The air and bulk sampling locations and results are reported below. Asbestos samples were collected according to New York State and U.S. EPA standards and~attalyzed according to and analyzed U.S, EPA standards using Transmission Electron ltficrosoopy. Other substances were collected and analyzed using the National institutes for Occupational Safety and Health protocol.

Based on our experience and direction front U.S..EP.A and the New York State Department of Labor we recommend that those samples that met the U.S. EPA Al-SERA clearance criteria`of 70 structures/square millimeter are considered acceptable and are considered safe for reoccupancy; However,•a. U4S. Occupational Safety and. Health Administration officer informed legal counsel for the American Stock Exchange that the Permissible Exposure Limit (PEL)-should be applied here. lt.was requested that the results detertni.tted using the U.S. AURA regulations be converted to OSHA style results. The U.S. AHERA regulations were developed to protect aIi children, f.aculty, and staff in schools from asbestos exposure. The two different methodologies, U.S. EPA AHERA methodology, and OSHA used methodology differ from the beginning of the.protocol. The U.S. EPA uses 70 structures per square millimeter (s/mm 2 ) as the value considered safe for school reoccuparicy by children, faculty, and staff after asbestos abaement. The AHERA protocol uses an electron microscope with a magnification of up to 290,000 times. The NIOSH method may use a phase contrast tight microscope with a magnification of up to 400 tilrres or an electron microscope. A}IERA allows a blank filter to have up to 70 structures per square millimeter. Structures. are fibers, clusters, bundles, and matrixes that contain asbestos fibers greater than 0.5 micrometers in length: If the average work area samples are found to have less than the 70 s/rnrrl no further action is required. lithe samples are found to be greater than 70 s/mrn then the asbestos air concentration outside the work area is compared with the work area air concentration and subjected to a Z-Test statistical technique or the work area may be re-cleaned-and the air re-sampled. The filter concentration is nmu!tiplied by the filter area and divided by the air volume satxtpled. (in cubic ENVIRONMENTAL Sc iNDUSTRnAL H'CtgNE CONSULTANTS WWW.£NV!ROHEALTH.ORG

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