GCMS blank analysis results, sample AE11799, May 2002

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Gas chromatography-mass spectrometry blank analysis for sample AE11799 showing results below method reporting limits for semivolatile organic compounds, dated May 28, 2002.

NYC-WTC_000012751–000012778

Folder label: “GCMS X 5-21-02 A 5-22-02”

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NYC 9/11 Public Portal Document Library Search Compound Report • Data File : C:\MSDCHEM\1\DATA\052202\521LB.D Vial: 3 Acq On : 22 May 2002 3:27 pm Operator: Mclean Sample : 5/21 ad Inst : Instrumen Mise Multiplr: 1.00 MS Integration Params: LSCINT.e Quant Method : C:\MSDCHEM\1\METHODS\052202.M (Chemstation Integrator) Title : 508 Modified GC/MS scan Library : C:\DATABASE\NIST98.L ********************************************************************* Peak Number 1 Methylene Chloride Concentration Rank 5

R.T. EstConc Area Relative to ISTD R.T.

3.70 1.14 ug/L 710558 1,4-Dichlorobenzene-d4 9.90

Hit# of 5 Tentative ID MW MolForm CAS# Qual

1 Methylene Chloride 84 CH2C12 000075-09-2 94 2 Methylene Chloride 84 CH2C12 000075-09-2 91 3 Methylene Chloride 84 CH2C12 000075-09-2 91 4 Methylene Chloride 84 CH2C12 000075-09-2 87 Abundance Scan 106 (3.702 min): 521LB.D (-95) (-) m/z 49.10 100.00% 49 84

5000

mfe-> 01 ..5 ... ।.... .....32831. + 10 15 20 25 30 35 40 45 50 55 60 65 70 75 80 85 90 95 58 —mhmmmmpH 88 m/z 3.40 3.60 84.00. 3.80 4.00 82.03% Abundance #12327: Methylene Chloride 49 84 5000 1 ■ ' i • ■ ■ ■ i • • ■ ■ > ■ ' • ■ I ■ ■ ■ ■ I 3.40 3.60 3.80 4.00 m/z 86.00 / 51.58% 88 04 । 14 18 24 2831 353841 11 ■ 1111 rt । ■ ■> ■. । ■ mi । ■ >■ i J111111111111! ■ । r 52________—mmoanmmmot mmmmomn 70______ , — m/z-> 5 10 15 20 25 30 35 40 45 50 55 60 65 70 75 80 85 90 95 Abundance #111040: Methylene Chloride 49 84 ■ ■ ■ i ' ■ ■ ■ । ■ i ■ 1 • ■ । 1 ■ • ■ i 3.40 3.60 3.80 4.00 5000 m/z 51.10 33.40% 35 88

niz-> 2528 01mpHHmpe ri I 1432 3841 I u 1111 ■ ■ । [ I Fi i j 111 < | ■ l l 12 + 5 10 15 20 25 30 35 40 45 50 55 60 65 70 75 80 85 90 95 70

Abundance #111039: Methylene Chloride 1 1 ■ i ■ ■ • ■ i ■ ■ ■ ■ i ■ ' ■ ' i ' • ‘ • I 49 3.40 3.60 3.80 4.00 m/z 47.10 17.37% 84 5000 wu./pHam 2831 3538 43 [, 52 57 88 67 71 77 0 TTmHUnpn—mmgmmmd—ng—hpT Tummmgugut — * * i * * * * i • * * • i * * 1 * । ‘ 1 * 1 I m/z—> 5 10 15 20 25 30 35 40 45 50 55 60 65 70 75 80 85 90 95 3.40 3.60 .3.80 4.00

521LB.D 052202.M Tue May 28 11:57:57 2002 Page 4

NYC-WTC_000012758

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NYC-WTC_000012758Source: NYC Law Department, mirrored locally

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