NYC 9/11 Public Portal Document
■ Pre-aeanin«A»m»e Cowen,ration, ot
_ _________________________________________________________________________________ __________
Cnit Observable deanbtg Itmes Presence of Asbestos Leant Lead MMf'F ^utn of
bfamber Dust_______ Test Cleaned Betongings^^ U^e Microvac Wipe Ranks
Rank Rank Rank Rank
5C significant 3A,3A,3B 3 No, 1 couch 3 3 1 6 13
» n»».™i SB,® 2 1 I W
SC significant i A,1A,3B 3 No. J couch 4 J 3 9 18
® sisoffic... MJA J 6 7 ■ »
Actoaif
4D significant 2A,2A 2 no, 1 chair & 9 6 4 3 22
ottoman
4C cigoffloaM lA J «..l«Bh 7 4 i W S3
2B minimi 3A I no, 1 couch 5 7 11 1 24
2A minimi noj conch
&chair
S sX A 3 yS'"" W S » S S
** * 2B 1 yes W 9 8 8 3$
ntintaai 2A.2A 2 .w/uoach n
Cleaning Equipment:
lA Basic w/o AFD
2A Intermediate w/HEPA w/o AFD
3A Advanced w/o AFD
IB Basic w/AFD
2B Intermediate w/HEPA w/AFD
3B Advanced w/AFD
The visual classification of dust in the apartments was also compared to the ranking for each
apartment. There was general agreement between the visual observations and the analytical
results in that five of the six units that were classified as having significant dust accumulation
ranked in the top six places. This indicates that visual observations of dust is an indicator that
contaminants associated with WTC-related dust may be present.
^^Each contaminant per sampling type was ranked based upon the average concentration per unit with the
highest average concentration receiving a rank of 1 and the remaining values continued in ascending order up to
12. The ranking for each combination was then summed for each unit to determine which unit had the highest
overall concentration of contaminants. The sum of the rankings for each compound per unit indicates that SC
contained the highest concentrations of contaminants prior to cleaning. Note that the lower the sum of ranks, the
higher the concentration of total contaminants.
Unit 4B is not included in the list of rankings because there were no lead micro vacuum samples collected in this
unit As a point of reference, the sum of the ranks for 4B for the asbestos, lead, and MMVF wipe samples totals
27. This indicates that this unit would have placed in the bottom-tier of the rankings.
^In rniits where personal belongings were retained, the items were cleaned and bagged, simulating a
situation where no belongings were present.
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NYC-WTC_000145805
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