Environmental record cover sheet, 333 Rector Place

NYC 9/11 Public Portal Document

SciLab Job #: 201092960 Page 3 of 3 Client Name: GCI Environmental Advisory, Inc. - Phase Contrast Microscopy (PCM) Fiber Results N01-B4087; Rockrose Development Corp.; 333 Rector Place Flow Air Fiber Fibers SciLab Client Date Rate Duration Filtered Density Conc. Fields Fibers TWA Sample # Sample # / Location Collected (liters/min.) (min.) (liters) (Fibers/mm 2 ) (Fibers/cc)

29 333-9/24-61 9/24/01 15 60 900 100 2 2.55 < 0.003 Apt. Kitchen (CAS) 30 P1l; 333-9/24-62 9/24/01 15 60 900 100 3 3.82 <0.003 Apt.; Kitchen (CAS) Reporting Notes: ~' Analyzed by: Tatyana Grimchak — T~Jfe nalyzed: 9/25/01

Samples analyzed by NIOSH 7400(A) Method, slue #2,8/15/94; Limit of I)ectection= 5.5 fibers per 100 fields or 7 fibers/mm2; This report relates ONLY to the sample analysis expressed as fibers/sq mm of filter area; ND = no fibers observed; NA = not analyzed; Walton-Beckett gradicule field area 0.00785 mm2; TWA =8 fir TWA calculation assumes zero exposure for remainder of 8 hr period not sampled; Upper 95% Confidence limit (Employers Compliance Test)- Calculated as a one sided UCL to determine 95% certainty of compliance with the 0.01 fiber/cc standard; Estimated relative standard deviation: Intralab Sr=0.405, lnterlab Sr=0.45, New York samples (NYSDOH FLAP Lab # 11480); National Institute of Standards and Technology

NYC-WTC 000120614