OCR status: ok · source: pdftotext
NYC 9/11 Public Portal Document
Gypsum was not detected in any sample.
Lead Before Cleaning Samples - Three micro vacuum samples and three wipe samples were collected. The results indicate that all three of the micro vacuum samples were below the comparison value of 25 pg/ft ’ and below the detection limit. The three wipe samples contained detectable concentrations of lead; however, all of the concentrations were below the primary clearance criterion of 25 pg/tV.
Post P' Cleaning Samples - Two air samples, three micro vacuum samples and four wipe samples were collected after the first cleaning. The two air samples were below the primary clearance criterion of 1.0 pg/m \ Two of the three micro vacuum samples were below the detection limit. The third micro vacuum sample was slightly above the detection limit, but below the comparison value. Three of the four wipe samples were below the detection limit. The fourth sample was above the detection limit but below the primary clearance criterion. Since the primary clearance criterion was met for lead after the first cleaning, no additional samples were collected for analysis of lead.
Alpha-Quartz Before Cleaning Samples - Pre-cleaning air samples were not collected.
Post P' Cleaning Samples - Two air samples were collected after the first cleaning. One of the two air samples detected alpha-quartz at a concentration above the detection limit, at 0.008 mg/m\ The detection also was above the primary clearance criterion of 0.004 mg/m’. The other air sample was below the detection limit. Since one air sample exceeded the primary clearance criterion, additional air samples for alpha-quartz were collected.
Post 2”"^ Cleaning Samples - Two air samples were collected after the second cleaning. The results showed that both samples were below the detection limit. This indicates that the second cleaning was able to reduce the alpha-quartz concentration in air to below the detection limit.
Calcite Before Cleaning Samples - Pre-cleaning air samples were not collected.
Post P‘ Cleaning Samples - Two air samples were collected after the first cleaning. All of the samples were below the detection limit.
Post Cleaning Samples - Two air samples were collected after the second cleaning. The results indicate that both samples were below the detection limit.
Cristobalite Before Cleaning Samples -Pre-cleaning air samples were not collected.
Post f Cleaning Samples - Two air samples were collected after the first cleaning. All of the samples were below the detection limit.
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CITY_21MC100_011105290
NYC-WTC_000195256
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machine-extracted · confidence unavailable · Check page ↗Similar subjects in other documents. Similarity does not establish the same event, measurement or conclusion.
NYC-WTC_000145695
Form documenting the tracking and handling of environmental samples collected by the Department of Environmental Protection.
Similarity score 0.999 (not a probability)
machine-extracted · confidence unavailable · Check page ↗NYC-WTC_000145695
Form documenting the tracking and handling of environmental samples collected by the Department of Environmental Protection.
Similarity score 0.982 (not a probability)
machine-extracted · confidence unavailable · Check page ↗NYC-WTC_000145695
Form documenting the tracking and handling of environmental samples collected by the Department of Environmental Protection.
Similarity score 0.982 (not a probability)
machine-extracted · confidence unavailable · Check page ↗NYC-WTC_000145695
Form documenting the tracking and handling of environmental samples collected by the Department of Environmental Protection.
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machine-extracted · confidence unavailable · Check page ↗NYC-WTC_000145695
Form documenting the tracking and handling of environmental samples collected by the Department of Environmental Protection.
Similarity score 0.981 (not a probability)
machine-extracted · confidence unavailable · Check page ↗NYC-WTC_000145695
Form documenting the tracking and handling of environmental samples collected by the Department of Environmental Protection.
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machine-extracted · confidence unavailable · Check page ↗Machine-extracted building matches; verify each source. Buildings, never households.
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