EPA interim final report on WTC background study, April 2003

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o "0 o Table 6-3. Summary of the analytical results for the organic and inorganic compounds from the background study. The table presents the sample c CT o 4^ size, frequency of detection, minimum and maximum detected concentrations, arithmetic mean, the statistic used, and the upper confidence limit o' tn (UCL) for each compound and matrix sampled. The values in this table were calculated using only the data sets from the common areas for each "□ o co co oi analyte. 03

O o o c Common Area Data Set Range 3 o Freq. Of Arithmetic 3

Analyte Matrix n Minimum* Maximum Statistic UCL Detection Mean Asbestos Bulk Dust 0

Air-PCM 14 10/14 0.1 i5 fZcc 0.007 fee 0.0028 fee 95% 0.0058 fee Chebyshev (Mean, STD) Air-TEMAHERA 14 2/14 0.no2 s/ee 0.0004 s/ee 0.00024 s/ee 95% 0.00032 s/ee Chebyshev (Mean, STD)

Air-TEMPCMe 14 1/14 0.'no2 s/ee 0.no4 s/ee 0.00023 s/ee 95% Ojso29 s/ee Chebyshev (Mean, STD) Microvacuum - All 18 6/18 792 s/cm^ 61,732 s/cm^ 7,145 s/cm^ Microvacuum - Carpet 9 3/9 792 s/cm^ 61,732 s/cm^ 9,409 s/cm^ Microvacuum - Chair 3 1/3 1,979 s/cm^ 22,952 s/cm^ 8,970 s/cm^

Microvacuum - Couch 6 2/6 792 s/cm^ 9,497 s/cm^ 2,836 s/cm^

Wipe-All 42 11/42 592 s/cm^ 3,798,910 s/cm^ 123,507 s/cm^ 97.5% 710,495 s/cm^ Chebyshev (Mean, STD)

* Minimum detected value includes values that may be % of the detection limit Table 6-3