Cover letter enclosing air quality reports, Trinity Place, Jan 2002

NYC 9/11 Public Portal Document

es/28f2e1 .10:14 631803195 EN<<IROSt:IENCECCNSLTAN PAGE 02

E.NVIROSCIENCE CONSVLtANTS, INC 2150 SMiTHTOWN AVENUE RONPGONIcQMA; NEW YORK 11 779-34$ PHONE: (631) 580-319I - • FACSIMILE (•631) 580.3195 a.6A*w * C. G0.sRRr, Pie. . P; b*RMOAT T. LY KHND RR • { M RR G. NCusCNWE1•1QE1! 20 a ~ ber 2001 1 oa~aoda u. MRNRCtO. b•$AVAREi6 Mr. Katmetb Coffey, President TechGlearr 242-E Route 109 Farmirxgdale, New 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 1•9x' , 20", 21", 24' 2001 at the American Stock Exchange, 86 Trinity Place, 22'7hames; and 65 Broadway,*New York, NY following the explosion, fire and collapse of the World Trade Center and adjacent'buildinjs. It was decided to collect samples ot:the followi:ig compounds based on an evaluat;ott of the Conditions due to the explosion, fire and collapse of the World Trade Center. 'Me substances collected included the following: asbestos (air and bulk), respirable dust. (mass & particle size distrilaution), lead, polychlorinnatedbiphenyls, poi n uciear aromatic hydrocarbons. The substances, sampling protocol, and standards employed were discussed with D. Mari:. Maddotoni the To2iicologist assigned to the World Trade Center site by US EPA. The ail and bulk sampling locations and results are reported below. Asbestos samples were collected according to New York State and U.S. EPA itandards 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 on 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 AkiERA clearance criteriaof 70 structuseslsquare'millimeter are consideredacceptable. and are considered safe for reocoupancy: However,•a. US. Occupational Safety and. Health Administration officer informed legal counsel for the American Stock Exchange that the Permissible Exposure Limit (PEL)-should be applied her.-e. It-was requested that the results determined using the U.S. AHERA regulations be converted to OSHA style results. The U.C. AHERA regulations were developed to protect all children, f.aculty, and staff in schools from asbestos exposure. The two dif rent methodologies, U.S. EPA AHERA methodology, and OSHA used methodology differ from the beginning of the protocol. li e U.S. EPA uses'70 structures per square millimeter (s/m&) as the value considered safe for school reoccupancy by children, faculty, and •staff after asbestos abaement. The AHERA protocol uses an electron microscope: with a magnif'rcatiori of up to 200,000 times. The NIOSH method may use a phase contrast 1ibktt microscope with a magnification of up to 400 threes or 4n electron microscope. AHERA allows a flank filter to have up to 70 structures per square millimeter. Structures. are fibers, ..lusters, 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/xrtm& no further action is required. If fhe samples are found to be greater than. 70 s/mtnt'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 Tray be re-cleaned-and the air re-sampled. The Wtor concentration is mu!t;plied'by the filter area and divided by the air volume satrapted.(in cubic ENVIRONMENTAL & RNDV$TRIAL HYCI NE CONSULTANTS WWW.£NVIROM£ALTH.ORG

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