Environmental health assessment report, 1 Liberty Plaza, Oct 2001

NYC 9/11 Public Portal Document

BROOKFIELD Fax:212-417-7194 Oct 22 2001 13:23 P.02 Oct•22-01 12159PM; Page 2/9 aant'Byi 411~.menn Ehvironmentel; 908 888 2636;

amk~eld Piaaoetol Propettiu Project No.; Y13190 Ociobmt 22, 2001 N3.74"

2.0 .O UCTION

2.1 aeral Discussion

Br,ok1Ieid Financial Prop es (Brooktleld) has retained Hiilmann Environmental O4 up ..LC. (Hilbnann) to p6rf0rrn an Environmental Health Risk Assessment at One Plaza. Hillmsnn was ileo eroployod by Drooldleld to perform environmental the restoration process since September ii u' ssItnplin and consulting thrbugbout 20p1.

Tle Purpose of this l Health Risk Assessment is to determine if there is Environt1t4h in the building relating to environmental fasten an elevated risk to human a:a by the explosions, and collapse of the World Trade Center.

On the morning of Sept 11e` 2001, The World Trade Canter (WTC) was subject to terrorist attack. This art k resulted in a tt'aglc loss of lives, the collapse of both 11 tory towers, the coU of? WTC, the collapse of the Marriott World Trade C for Hotel, and ad+attrcpltc damage to the other WTC buildings. The collapse as remendous physiosi !ones to be exerted on the materials within the atruetures and to the sumo dng buildings. Many ofthe eenatruction materials and ishes within the jowers were ground to a tine duet by the force of the eo displacement Of material and air during the collapse caused what has butt described as a 'hurricane like" wind within a two-block radius of the collapse. This debris laden wind causOd damage to the exterior eidrw of buildings being the W ' and the interior offices adjacent to broken windows. Some of the buildings steel and debris. ditect)y adjacent to the WTC received structural damage from falling Oc Liberty plaza was poll hit by steel or heavy pieces of debris and was not stiucturaIly damaged. primary environmental iconcern from this damage (non•strsetural) is from the dyer created by the collapse# and the smoke from the burning of debris. The dust c>jntains cement constituents in the WeOONt percentage, followed by fibrous glass, gypsum, cellulose and other {+material, The steel structure of the lower 40 floors of the N4*th tvwmr was sprayed with fereproofng camaining approximately 40% asbestos. t of that material had beet abated front the accessible interior steel over the y the err; ho wever, asbestos renamed on the exterior steel, under the alwnimam building. Testing by Ylillmatiu and others found some of the dust and debris skin of adjacent South of the to! the North tower to Contalat greater than 1% asbostom sod the dust to the asbestos. North tower (where One Lihbtty P1372 15 located) to contain leas than 1%

LI Building Reaction and Damage to Out Liberty plaza ftc building stale' reacted in a timely mawact to protect both human life and the South tower of ifliegrity of the building syeems. When the second plane struck the system a manual shut down of the HVAC the W'1'C, the building engüsers performed resulted In the i eluding the closing of o ids air intake dampers. This action

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NYC-WTC 000124232