Air quality analysis report, 22 River Terrace, Sep 2001

NYC 9/11 Public Portal Document

SciLab Job #: 201092731 Page 2 of , 2 Client Name: GCI Environmental Advisory, Inc. Phase Contrast Microscopy (PCM) Fiber Results NO1-B4086; Rockrose Development Corp.; 22 River Terrace, NYC! CLEARANCE Flow Air Fiber Fibers SciLab Client Date Rate Duration Filtered Fields Fibers Density Conc. TWA Sample # Sample #1 Location Collected ( liters/min.) (min.) 2 (liters) (Fibers/mm ) (Fibers/cc)

16 9/21-16 9/21/01 15 60 900 100 5 6.37 <0.003 Apt.l Loom /CAS 17 -9/21-17 9121/01 15 60 900 100 3,5 4.46 < 0.003 Apt.; /CAS 18 -9121-18 9/21/01 15 60 900 100 2 2.55 < 0.003 Apt.; fCAS 19 ;9/21-19 9121/01 15 60 900 100 3 3.82 < 0.003 AptJ om /CAS 20 19/21-20 9/21/01 15 60 900 100 3 3.82 < 0.003 Apt; ;CAS 21 ;9/21-21 9/21/01 15 60 900 100 2 2.55 < 0-003 Apt tom /CAS 22 'r 9/21-22 9/21/01 15 60 900 100 3 3.82 < 0.003 Apt -.-.-.--.-.-.--.-.-.--.-.-.-, ACAS Reporting Notes: ( I i I ihrt s/cc cannot h r;/c 1t sampics for blanks) with no a;r volume. As c ce,t I". ;ana (irs sschak / Date Analyzed: 9/22/01

Sans; ks .sns/ zed by lOSI 1710!1(.'1! Method, Issue 92, 8/15194; Limit of Deetection= 5.5 fibers per 100 fields or 7 fibershnm2; This report relates ONLY to the sample analysis expressed as fibers/sq nun of filter area; ND = no fibers observed; NA = not an Ivied; 'Aalton-lteckctt gradicule f ehi area 0.00785 mm!; 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, Interlab Sr=0.45, New York samples (NYSDOII FLAP Lab # 11480); National Institute of Standards and Technology

NYC-WTC 000120887