NYC-WTC_000195194

NYC 9/11 Public Portal Document

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«ii Illi«55«:5g5;;5 75^^ 5:5: ■iiiiiiiiiliiM Table 10,0 ill::;:®:;::s:;:;7:::5:::::::;;: Ranking of Residential Units by WxKjKKiKf™

555:;;7!llllilil Pre-Cleaning Average Concentrations of Contaminants^^ liliillliiliiiiiBii lllliiii Unit Observable Cleaning Times Presience^ Asbe^ Ledd MM Sum of Number Dust Test Cleaned Belangings^^ 9^ filpe Mierovac Ranks Rank Rank Rank Rank otS 55555-5C; significant 3A,3A,3B 3; No, 1 couch 3: 735. T5-5.:5^ -5:657 5513;:: 557

w 5A minimal 3B,3B No, 1 couch 12 liili ■iiii significant IA,1A,3B 3: No, 1 couch 4. ■'51... , ,3 .§5^55 §5185:55.75 iilii significant 1A,1A i no, 1 couch 5 i^/lBlil IBii & cliair 4D: significant ;2A,2A 2 no, 1 chair & 9 6 4 3 22 ottoman 4C significant no, 1 couch it :45 iii trajuihal; 1 no, 1 couch 3 7 11 i 24 IlBll inintmat IB. IB no, 1 conch i 9i iii & chair 55i5:55D555§;i significant 3B 1 no. 1 couch 8 105 ■5: II 34 3B minimal Scope A Yes ■i ;fg5:5 51:5'3A57:7: niininial 2B T yes, carpet lb 9 8 8 .35 • 4A minimal 2A,2A no, I couch Ml 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 41 contaminants associated with WTC-related dust may be present.

2^ach 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 5C 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.

2^In units 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_000195303