DDC fax transmittal re: WTC scaffolding at Liberty Street, July

NYC 9/11 Public Portal Document

AMBIENT GROUP DiozinsZFnrans, HRGC/HRMS (8290) Client Sample ID: 211909-03D

Lot-Sample#-: Q2D190191-003 Work Order#-: EX6VE1AA Matrix—.: SOLID Date Sampled-: 04/18/02 Date Received..: 04/19/02 Instrument: 5DS Prep Date—: 04/19/02 Analysis Date-: 04/24/02 Units—: Pg/g Prep Batch 2109509 Dilution Factor: 1 % Moisture:

DETECTION TBP TEQ UMIT FACTOR CONCENTRATION PARAMETER RESULT

23,7,8-TCDD 570 1.000 570.000000 133,7,8-PeCDD 1700 0.500 850.000000 133,4.7,8-HxCDD 1500 0.100 150.000000 133,6,73-HxCDD 2900 0.100 290.000000 133.7,83-HxCDD 2700 0.100 270J100000 1,23,4,6,7,8-HpCDD 19000 0.010 190.000000 OCDD 46000 0.001 451100000 23,7,8-TCDF 3100 CON 0.100 310.000000 133,73-PeCDF 4300 0.050 2201100000 23,4,7,8-PeCDF 6500 0.500 3,200.000000 133,4,7,8-HxCDF 5200 0.100 520.000000 133,6.73-HxCDF 6500 0.100 5501100080 23,4.5,7,8-HxCDF 7000 0.100 700.000000 133.7,83-HxCDF 500 0.100 50.000000 133,4,5,7,8-HpCDF 35000 0.010 350.000000 1,23,4,7,83'HpCDF 4100 0.010 411M10000 OCDF 25000 0.001 25.000000 Total TEQ Concentratton 8,532.000000 PERCENT RECOVERY INTERNALSTANDARDS RECOVEIY LIMITS

13C-2,3,7.8-TCDD 65 40-135 13C-l,2,3,7,8-PeCDD 58 40-135 13C-l,2,3,6.7,8-HxCDD 55 40-135 130-1,2,3,4,6,7,8-HpCDD 73 40-135 I3C-OCDD 92 40 - 135 13C-23,7,8-TCDF 80 40-135 13C-I,2,3,7,8-PeCDF 69 40-135 1301,23.4.7,8-HxCDF 65 40-135 130133.4,6,7,8-HpCDF 77 40-135

Notes: TEF values an ehed in UB. Environmentel Protepdon Agency, (1989) Interim procedures ftr esrimating dsto associated with exposures to miauresofcMorinattd sod -dtbeneofittans (CDDs and CDFs) and 1989 update. OB. Enviromnental Protection Agency, Side Assessment forum, Washington, DC;

CON Confirmation analysis.

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