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NYC-WTC_000195194

Label derived from the City's folder field. The City does not supply document titles.NYC-WTC_000195194–000195366
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NYC 9/11 Public Portal Document

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. All samples were below the detection limit.

Calcite Before Cleaning Samples - Pre-cleaning air samples were not collected «r w Post P‘ Cleaning Samples - Two air samples were collected after the first cleaning. All of the samples were below the detection limit. «r

Cristobalite 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.

Tridymite Before Cleaning Samples - Pre-cleaning air samples were not collected.

Post P‘ Cleaning Samples - Two air samples were collected after the first cleaning. All were below the detection limit.

MMVF Before Cleaning Samples - Two pre-cleaning air samples and three pre-cleaning wipe samples were collected. The two air samples had MMVF detected, but were below the primary clearance criterion. The three wipe samples had MMVF detected in concentrations from 57.23 S/cm’ to 801.24 S/cm7

Post P' Cleaning Samples - Three air samples and five wipe samples were collected after <• the first cleaning. All of the air sample results indicate that MMVF was present at levels « below the primary clearance criterion of 10 S/L. All of the wipe sample results were below the detection limit of 22.89 S/cm^. This indicates that the cleaning method was able to reduce the pre-cleaning concentration of MMVF.

PAH Before Cleaning Samples - Three pre-cleaning wipe samples were collected. All three were below the detection limit. The TEF for each sample was below the primary clearance criterion.

w Post P‘ Cleaning Samples - Four post-cleaning wipe samples were collected. All four were below the detection limit. The TEF for each sample was below the primary clearance criterion of 300 pg/m^.

47

CITY_21MC100_011105277

NYC-WTC_000195243

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NYC-WTC_000195243Source: NYC Law Department, mirrored locally

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