Air quality test reports cover letter, Jan 2002

NYC 9/11 Public Portal Document

89/28/2@@1 .1@:14 6315803195 ENt+IROSCIENcE KSL.TAN PAGE 02

E.NVIROSCIE.NCE CONSULTANTS, INC.. 2150 SM•ITHTOWN AVENUE RONKONKOMA;NEW YORK i t 779-1'348 PHONE:(631)580-3191 • FACStM1LE (631) 580-3195

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L.$AVAREBc Mr. Kenneth Coffey, President Techt lean 242-E Route 109 Farwhagdale, 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 condu4ed September l9's . 20", 21'u, 24'0 2001 at the•Amprican Stock Exchange, 86 Trinity Place, 22 Thames, and 65 l3roadway..'New York, NY following the explosion, fire and collapse of the World Trade Center and adjacent. buildings. It a as destded to collect samples of the following compounds based on an evaluat;ott of the conditions due to the explosion; fire and collapse of the: World Trade Center. The substances collected included the following: asbestos (air and bulk), respirable .(mass & particle distribution), lead, polychlorinatedbiphenyls, po'lyruclear aromatic due:

size

hydrocarbons. The substances, sampling protocol, and standards employed were discussed with Dir. . M.srk. Maddotoni the Toxicologist assigned to the World Trade Center site by US EPA: The and bulk air

sampling locations and results are reported Asbestos samples were collected according to New below.

York State and U.S. EPA standards and:arialyzed according to and analyzed U.S. EPA standards using Transmission Electron Microscopy. Other substances were collected and using the National analyzed

Institutes for Occupational Safety and Health protocol.

Based or, our experience and direction from U.S..EP.A and the New York State Department of Labor we .recornmeud that those samples that met the U.S. EPA Al-IERA clea!M,.rxoe criteria`of 70 structures/square ruiilimteter axe ..otisidered'ac ceptable and are considered safe for reoccupaucy. Hot;ever,.a. U.S. Occupational Safety and. Health Administration officer informed legal counsel for the A.nnerican 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 stye results. The U.S. AHERA regulations were developed to protect all: children, faculty, and staff in schools from asbestos exposure. The different methodologies, U.S. EPA AHERA methodology, and OSHA two

Bused methodology differ from the beginning of the protocol. The U.S. EPA uses 70 structures per square millimeter (s/m.1n2 ) as the*value considered safe for school reoccupancy. by children, faculty, and 'staff after asbestos abaement. The AHERA protocol uses all electron microscope with a magnification of up to 200,000 times. The NIOSH method may use phase contrast light microscope with a magnification of a

up to 400 tirr;e; or an electron microscope. A-riER4 allows a flank filter io have up to 74 structures per square millimeter. Structures are fibers, clusters, bundles, and matrixes that contain asbestos fibers greaterthan 0.5 .micrometers length. if the work found have in

average

area samples are

to

less than

the

70 s/cnm` no further action is required. If0he samples are found to be greater than '70 s/mm2 then the asbestos air concentration outsideahe 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. Th e

fi lter

concentration is

multiplied by the filter area

divided by

the and air volume

cubic

sampled.(in

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