Environmental record cover sheet, 333 Rector Place

NYC 9/11 Public Portal Document

SciLab Job #: 201092961 Page 2 of 2 Client Name: GCT Environmental Advisory, Inc. Phase Contrast Microscopy (PCM) Fiber Results NOI-B4087; Rockrose Development Corp.; 333 Rector Place Flow Air Fiber Fibers SciLab Client Date Rate Duration Filtered Density 2 Conc. Fields Fibers TWA Sample # Sample # / Location Collected (liters/min.) ( min.) (liters) (Fibers/mm ) (Fibers/cc)

16 333-9/24-78 9/24/01 15 60 900 100 2 2.55 < 0.003 Apt.; ;Bathroom (CAS) 17 333-9/24-79 9/24/01 15 60 900 100 9 11.46 0.005 Apt.; !Bathroom (CAS) IS 333-9/24-80 9/24/01 15 60 900 100 4 5.10 < 0.003 Apt; P11 Livingroom (CAS) 19 333-9/24-81 9/24/01 15 60 900 100 10 12.74 0.005 Apt j .ivingroom (CAS) 20 333-9/24-82 9/24/01 15 60 900 100 6 7.64 0.003 Apt; Kitchen (CAS) Reporting Notes: Analyzed by: Anthony Minion Date Analyzed: 9/25/01

Samples analyzed by NIOS1l 7400(A) Method, Issue #2, 8/15/94; Limit of Dectection= 5.5 fibers per 100 fields or 7 fibers/mm2; This report relates ONLY to the sample analysis expressed as fibers/sq mm of fi lter area; ND = no fibers observed; NA = not analyzed; Walton-Beckett gradicule field area 0.00785 mm2; TWA =8 Hr 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: Intrrlab Sro0.405, Interlab Sr=0.45, New York samples (NYSDOIt ELAP Lab # 11480); National Institute of Standards and Technology

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