NYC 9/11 Public Portal Document
03/27/2003 10:50 FAX -•
l 003/015
MONARCH LLC 212 425 8142 03/26 '03 12:08 NO.666 03/15y i UU-0
.+v ar. VW a•m r vi pyo dYV'• DnLVA
Environmental Monitoring & Consulting Associates
P.O. BOX 872• SOMEFNILLE. • (722) X003 - FAX(TW)248.384
March 25,2003
Mr.John O'Brian
Highlands Development LLC
88 Oreenwiob Street
Management Office
New York, New York 1A006
RE: 58 Greçn1ek,,
New Yank,New York
Dear Mr. O'Brian:
Enclosed please find thA test results of the fifteen (15) dust xamplea that wv collected at tic
above referenced localion on March 3,7003.
The fifteen (15) duct s2tmples were collected 'between masonry paving stones on the tw v:y-
fourth floor Sky Lounge balcony, The dust samples were art analyzed using Polarized Li ;ht
Microscopy(PLM)and Jive(5)ofthe fifteen (15) ware found to have a trace amount(less that
one percent)of asbestos_
PI.M can be used to d ne asbestos containing material in dust and debris. A material •is
considered in be aabcatois containing material ifit contains more than 1% asbestos using the PLM
method_ The PLM method only counts the linger asbestos filers_ Therefore,ifresults by PLM
are negative(g> ter than I%•aabestos), the sample is then analyzed by the Transmission
Electron Microscopy(ITEM)method that does covert the smaller fibers. However,TEM analy:'is
is not used for regulatory purposes for dust samples.
-I-
NYC-WTC 000117257
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