Letter report detailing air sampling for metals conducted on multiple dates between May and June 2002 at the referenced school.
NYC-WTC_000175567–000175569
OCR status: ok · source: pdftotext
NYC 9/11 Public Portal Document
Mr. Bernard P. Orlan July 1,2002 Air Sampling for Metals Page 2 H.S. for Leadership & Pub. Service f894Ml ATC Project No. 15-19125-0290 Results
Chromium (Cr) was detected in all four samples, and both blank samples. Lead (Pb) was detected in three of the four samples (main lobby, IO* floor by elevator and on the roof) and both field blanks. Blank-correcting the Cr and Pb concentrations in the samples lowers them to below the limits of detecti on.
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Chromium (Cr) was detected in all four samples and both blank samples. Aluminum (Al) was also detected in all four samples but not in the field blanks. Blank-correcting the Cr concentrations in the samples lowers them to below the limits of detection. The USEPA has no screening level for aluminum.
May 17 The metals that were found above the limits of detection were aluminum (Al), chromium (Cr), copper (Cu), iron (Fe), lead (Pb), magnesium (Mg), and Zinc (Zn). The other metals were not detected. The table shows the locations and concentrations at which Al, Cr, Cu, Fe, Pb, Zn, and Mg were detected. Al, Cr, Fe, and Pb were detected in the blank. Subtracting the blank concentrations :foni those found in the samples reduces the actual levels considerably. The blank-conected metal concentrations are shown in the table. METALS IN AIR CONCENTRATIONS May 17,2002 (Blank-corrected) (ug/m^ *) KOCStTION7- Aluminum Chromium' SAMPiBOOa 'f
Main lobby BDL** 0.143 BDL BDL BDL BDL BDL /Ml
5* Floor Elev BDL 0.179 BDL -1.39 -0.0116 BDL BDL Lobby/M2
lOthFloor Elev BDL -0.029 BDL -0.65 -0.0067 BDL BDL /M3
Roof/M4 2.26 0.580 0.646 2.45 0.4 0.781 2.36
Blank/M5 BDL 0.733 BDL 3.97 0.344 BDL BDL (ug/sample)
Blank/M6 1.03 0.826 BDL 6.91 0.323 BDL BDL T (ug/sample) ■- micrograms per cubic meter of air ** Below Detection Limit
CONFIDENTIAL, CITY_21MC100_003431666 SUBJECT TO PROTECTIVE ORDER NO. 2, SEPT. 2008
NYC-WTC_000175568
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NYC-WTC_000175577
Letter report detailing air sampling for metals conducted on March 15, 22, and 29, 2002, at the referenced school.
12 shared non-person entities · 1 shared topics · similarity 0.993
machine-extracted · confidence unavailable · Check page ↗13 shared non-person entities · 1 shared topics · similarity 0.989
machine-extracted · confidence unavailable · Check page ↗12 shared non-person entities · 1 shared topics · similarity 0.989
machine-extracted · confidence unavailable · Check page ↗12 shared non-person entities · 1 shared topics · similarity 0.989
machine-extracted · confidence unavailable · Check page ↗12 shared non-person entities · 1 shared topics · similarity 0.989
machine-extracted · confidence unavailable · Check page ↗12 shared non-person entities · 1 shared topics · similarity 0.989
machine-extracted · confidence unavailable · Check page ↗13 shared non-person entities · 1 shared topics · similarity 0.988
machine-extracted · confidence unavailable · Check page ↗13 shared non-person entities · 1 shared topics · similarity 0.988
machine-extracted · confidence unavailable · Check page ↗NYC-WTC_000180110
Report of air sampling for metals conducted at the referenced school on June 22, 2002.
12 shared non-person entities · 1 shared topics · similarity 0.988
machine-extracted · confidence unavailable · Check page ↗NYC-WTC_000175558
Letter report detailing air sampling for metals conducted on June 22, 2002, at the School of Economics and Finance.
12 shared non-person entities · 1 shared topics · similarity 0.988
machine-extracted · confidence unavailable · Check page ↗13 shared non-person entities · 1 shared topics · similarity 0.987
machine-extracted · confidence unavailable · Check page ↗12 shared non-person entities · 1 shared topics · similarity 0.986
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Letter report detailing air sampling for metals conducted on March 15, 22, and 29, 2002, at the referenced school.
Similarity score 0.980 (not a probability)
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NYC-WTC_000175577
Letter report detailing air sampling for metals conducted on March 15, 22, and 29, 2002, at the referenced school.
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