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NYC-WTC_000199782
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NYC 9/11 Public Portal Document
;UM“25-07 07:46 Prom:718 935 3463 71B9353463 ’-133 P.33/07 Job-O16
104 East 25th St New York, New 'York 10010 www.ato-flnvlro.com 212.353.8280 Fax 212.353.8300 ASSOCIATES live.
Mr. Beraard P. Orlan June 6,2002 Page 2
2. IS 306X
A total of ten (10) dust wipe samples were collected fi'om selected unit ventilators throughout the school. Laboratory analysis detected lead concentrations which ranged between 1,817.0 gg/fl? to 259.4 gg/ft^. The average concentration was 806.38 gg/ft^
B. LEAD WIPE SAMPLING-HVAC UNITS
I. STUYVESANT HIGH SCHOOL
A total of fifteen (15) dust wipe samples were collected from various HVAC units throughout the school. Laboratoty analysis detected lead concentrations which ranged between 253.0 gg/fr to less than the limit of detection of 9.0 gg/ft^. The average concentration was 89.16 gg/ff.
2. IS306X
A total of eighteen (18) dust wipe samples were collected from various HVAC units throughout the school. Laboratory analysis detected lead concentrations which ranged between 466.7 gg/f? to 18.5 gg/ff. The average concentration was 159.45 gg/ft^.
Exact sample locations and analytical laboratory results for the samples collected at each school is included in Appendix A of this report.
C. DIOXIN BULK SAMPLING - STUYVESANT HIGH SCHOOL
ATC collected twenty-four (24) samples for PCDDs/PCDFs (plus two blanks) within Unit Ventilators and HVAC units at Stuyvesant High School. All samples were submitted for laboratory analysis to Pace Analytical Services, Inc. (Pace) of Minneapolis, MN, a laboratory experienced in dioxin analysis. The analysis was performed by modified EPA Method 8290 using combined capillary column gas chromatography/high resolution mass spectrometry.
Each sample was analyzed for sixteen (16) PCDD/PCDF isomers. The results for each isomer were then converted to 2, 3, 7, 8 tetrachloro-dibenzo-p-dioxin (2, 3, 7, 8-TCDD)- equivalents by multiplying by an established equivalency factor. This provides a single value for the analytic^ results for each sample.
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NYC-WTC_000199783
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NYC-WTC_000199783Source: NYC Law Department, mirrored locally
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