Memo on air and bulk sampling results, Sep 2001

NYC 9/11 Public Portal Document

09, 26/'2001 12: 14 5315803195 ENVIROS IENCEOtSLTAN PAGE 02

E.NVIROSCJENCE CONSULTANTS, INC. 2150 SMIT HTOWN AVENUE RONKONKOMA, NEW YORK 1 1779-1348 PHONE: (631) 580- 19'1 • FACSIMILE (631) 580-3195

V. GALLA * C. GILSRRr, Pq.p. P. OKRMOI' T. KLUEPOew ,, /~/~ E. OCTWUOLER . N U1CPIWENOCR 28 September 2001 .. . DOWCOLL

L. $AVAEBE Mr. Kenneth Coffey, President TechClean 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 86 Trinity Place, 22 Thames, and 65 Broadway, New York, NY.

Dear Mr. Coffey:

Air and bulk sampling was conducted September 191 .20", 21s', 24 1 2001 at the•Anserican Stock Exchange, 56 Trinity Place, 32 Thames, and 65 Broadway. New York, NY following the explosion, fire and collapse of the World Trade Center and adjacent. buildings. 1, was derided to collect samples off the followvi:igg compounds based on an evaluat;on of the conditions due to she explosion; fire and collapse of the World Trade Center. The substances collected included the following: asbestos (air and bulk), respirable dust (mass & particle size distribution),' lead, polychlorinatedbiphenyls, polynuclear aromatic hydrocarbons. The substances, sampling protocol, and standards employed were discussed with D. Mark. Maddoloni the Toxicologist assigned to the World Trade Ceutet 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 analyzed according to and analyzed U.S, EPA standards using Transmission Electron Microscopy. Other substances' were collected and analyzed using the National institutes for Occupational Safety and Health protocol.

Based or: our experience and direction from U.S. EPA and the New York State Department of Labor we recommend that those samples that met the U.S. EPA AlfERA clearance criteria of 70 structures/square millimeter are considered 'acceptable and are considered safe for reoccupancy. However,-a. U.S. Occupational Safety and. Health Administration officer informed legal counsel for the American Stock Exchange that the Permissible Exposure Limit (PEL)-should be applied here. It was requested that the results determined using the U.S. AHERA regulations be converted to OSHA style results, The U.S. AHERA regulations were developed to protect all children, faculty, 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 squire millimeter (s/roan') as the value considered safe for school reocccupaacy. by children, faculty, and •staff after asbestos abaement. The AHERA protocol uses a;, electron microscope with a magnification of up to 200,000 times. The NTOSH method may use a phase contrast light microscope with a magnification of up to 400 tuxes or an electron microscope.. AHERA allows a blank filter to have up to 70 structures per square millimeter. Structures. are fibers, :lusters, bundles, and matrixes that contain asbestos fibers grater than 0.5 micrometers in length. if the average work area samples are found to have less than the 70 slmrn` no further action is required. If the samples are found to be greater that. '70 s/mm2 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 mu!tiplied by rite filter area and divided by the air volume sampled (in cubic ENVIRONMENTAL & INDUSTRIAL HYGIENE CONSULTANTS WWW.ENVIROHEALTH.ORG

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