NYC-WTC_000195194

NYC 9/11 Public Portal Document

cleaning. Both samples were below the detection limit.

Post P' 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 S/L. The four wipe samples had detectable concentrations of MMVF.

Post J'* 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 P‘ Cleaning Samples (Tssi 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 S/L at 17.579 S/L and 60.606 S/L. All of the wipe samples were below the concentrations detected during pre-cleaning sampling and were similar to the concentrations after Test 4A.

Post P‘ 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 S/L.

Post P* 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 S/L.

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 pg/m\ Two of the four wipe samples also detected three PAH compounds; however, the calculated TEFs were below the primary clearance criterion of 300 gg/m^. The remaining two samples were below the detection limit. The TEF for each sample was below the primary clearance criterion.

Post P‘ Cleaning Samples (Tsst 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 pg/m ’.

Post P‘ 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 of 300 pg/m".

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