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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

cleaning. Both samples were below the detection limit.

Post Cleaning Samples (Test 4B) - Two air samples were collected. Both samples were below the detection limit.

Post Cleaning Samples (Test 4C) - Two air samples were collected. Both were below the detection limit.

MMVF Before Cleaning Samples - Two air samples and four wipe samples were collected. MMVF was present in both air samples, but below the primary clearance criterion of 10 SZL. The four wipe samples had detectable concentrations of MMVF.

Post P‘ Cleaning Samples (Test 4A) - 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 indicate that MMVF was present at concentrations below pre-cleaning samples.

Post f‘ Cleaning Samples (Test 4B) - Three air samples and five wipe samples were collected after the first cleaning. Two of the three air samples exceeded the primary clearance criterion of 10 SZL at 17.579 SZL and 60.606 SZL. All of the wipe samples were below the concentrations detected during pre-cleaning sampling and were similar to the concentrations after Test 4A.

Post Cleaning Samples (Test 4C) - Five air samples were collected after the first cleaning. All of the air samples indicate that MMVF was present at levels below the primary clearance criterion of 10 SZL.

Post f Cleaning Samples (Test 4D) - Three air samples were collected after cleaning. All of the air samples indicate that MMVF was present at levels below the primary clearance criterion of 10 SZL.

PAH Before Cleaning Samples - Two air samples and four wipe samples were collected. The two air samples both detected six PAH compounds; however, the calculated TEFs were below the primary clearance criterion of 0.2 pgZm’. Two of the four wipe samples also detected three PAH compounds; however, the calculated TEFs were below the primary clearance criterion of 300 pgZm^. The remaining two samples were below the detection limit. The TEF for each sample was below the primary clearance criterion.

Post P‘ Cleaning Samples (Test 4A) - Four wipe samples were collected. All four samples were below the detection limit. The TEF for each sample was below the primary clearance criterion of 300 pgZm^.

Post f Cleaning Samples (Test 4B) - Four wipe samples were collected. All four samples were below the detection limit. The TEF for each sample was below the primary clearance criterion of300 pg/m^.

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NYC-WTC_000145786Source: NYC Law Department, mirrored locally

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