NYC-WTC_000231002

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I i o o Ambient Group, Inc. 55 West 39th St, 12 FL 2: O • ? o co

“0 o ro Ca3 New York, New York 10018 J ! S cp i o o o I "0 o -tJK “ 1 o tS ~ 2 O Client: Cushman & WakefieldiWercantile Exchange a j o One North End Avenue ” i 3 New York, New York 10282 “ j § Project ID #211338 Pfcject Address: One North End Avenue Survey Dale: November 20,2001 I s o ?a SILICA RESULTS o cz: .

Concentrations Reported In mglm’ SlandardfGuldellnes o FlnorZLocatlon uristobalile Quartz 11th floortnailway aajacent to elevator <0.009 <u.uua 7tti^or/adiacent to stair C <0.009 <D,O09 NtOSir LOS mg/m’ aru noonaajacent to slalrD <0.009 <0.009 X fifh floor/atiiacenl elevator oanx a <0.009 <0,Q«9 s As CD K D AH levels reported are below their associated standards and guidelines. o

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