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Chain of custody form for DEP environmental samples, 2001

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Form documenting the tracking and handling of environmental samples collected by the Department of Environmental Protection.

NYC-WTC_000145695–000145868

Folder label: “NO INFO

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NYC 9/11 Public Portal Document

Post P* deeming Semiples - Two air samples, three micro vacuum samples and four wipe samples were coUected after the first cleaning. The two air samples, aU three micro vacuum samples, and three of the four wipe samples were below the detection Umit. The fourth wipe sample was above detection limit but below the primary clearance criterion. The results fi’om the first cleaning indicate that the cleaning technique was effective in removing the elevated concentrations of lead observed prior to the first cleaning. Because the primary clearance criterion for lead was met after the first cleaning, no additional samples were coUected for analysis of lead.

Alpha-Quartz Before Cleaning Samplesair samples were not collected.

Post P‘ Cleaning Samples - Two air samples were collected after the first cleaning. AU of the samples were below the detection limit. This indicates that the cleaning method used was able to reduce the pre-cleaning concentration of alpha-quartz. Because aU of the samples were below the detection limit after the first cleaning, no additional samples were coUected for analysis of alpha-quartz.

Calcite Before deeming Samples - Pre-cleaning air samples were not coUected.

Post P‘ Cleaning Samples - Two air samples were coUected after the first cleaning. AU of the samples were below the detection limit. Because all of the samples were below the detection limit after the first cleaning, no additional samples were coUected for analysis of calcite.

Cristobalite Before deeming Samples - Pre-cleaning air samples were not coUected.

Post P‘ Cleaning Samples - Two air samples were collected after the first cleaning. All of the samples were below the detection limit. Because aU of the samples were below the detection limits after the first cleaning, no additional samples were coUected for analysis of cristobalite.

Tridymite Before deeming Samples - Pre-cleaning air samples were not coUected.

Post f* Cleaning Samples - Two air samples were collected after the first cleaning. AU of the samples were below the detection limit. Because all of the samples were below the detection limits after the first cleaning, no additional samples were coUected for analysis of tridymite.

MMVF Before deeming Samples - Four pre-cleaning wipe samples were collected. One of the four samples was below the detection limit; MMVF was detected in the other three samples.

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NYC-WTC_000145738

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NYC-WTC_000145738Source: NYC Law Department, mirrored locally

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