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_000145786
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