GCMS blank analysis results, sample AE12288, June 2002

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Laboratory report documenting gas chromatography-mass spectrometry analysis of a method blank (AE12288) for volatile organic compounds on June 3, 2002.

NYC-WTC_000014154–000014176

Folder label: “GCMS X 5/24/02 A 5/29/02”

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NYC 9/11 Public Portal Document Library searen compound Keport ’Data’ File : C:\MSDCHEM\l\DATA\052902\LB.D Vial: 4 Acq On : 29 May 2002 12:32 pm Operator: McLean Sample : gc/ms scan 5/24 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 4 R.T. EstConc Area Relative to ISTD R.T. 3.72 2.64 ug/L 1583980 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 90 4 Methylene Chloride 84 CH2C12 000075-09-2 87 Abundance Scan 109 (3.720 min): LB.D (-93) (-) m/z 49.10 100.00% 49 84

5000

' ■ ■ i ■ ■ ■ ■ i ■ ■ ' ■ i ■ ■ ■ ■ i ■ 1 ■ ■ i

88 3.40 3,60 3.80 4.00

miz-> 0- 5 35384158 HTTg ‘118Tpt t 1 irprr । ri 11111111111 i p i1111111 | 1 Til j Uli 11 I TTp-TT 10 15 20 25 30 35 40 45 50 55 60 65 70 75 80 85 90 95 + m/z 84.00 68.01% Abundance #12327: Methylene Chloride 49 84 5000 • ■ ■ i ■ ■ • ■ i ■ • ■ ■ i 1 • ■ ■ i ■ • • ■ । 3.40 3.60 3.80 4.00 m/z 86.00 51.23% 88 n/z-> 14 18 24 2831 353841 11 ,12 Of TTHit 70 t 5 10 15 20 25 30 35 40 45 50 55 60 65 70 75 80 85 90 95 H Abundance #111039: Methylene Chloride 49 84 3.40 3.60 3.80 4.00 5000 m/z 51.10 31.03% —

52 57nmmm*gmnyomooonf 67 71 77 . —hpm 88 0+ 2831 3538 43 t... >1.... ।(H,... j i ■, ■ t >. i, l< T1— iz-> 5 10 15 20 25 30 35 40 45 50 55 60 65 70 75 80 85 90 95 Abundance #111040: Methylene Chloride ■ ■ ' i ■ ■ ■ ■ i ■ ■ ■ ■ i ' ■ ' ■ i ■ ■ ■ ■ i 49 3.40 3.60 3.80 4.00 84 m/z 47.10 17.08% 5000

35 —MHHt. 11 +2 88

iz-> 14 0 ■11 “ TIHH 2528 32 ,384 70 . (.... ।.... ।. I. i., ।..., ।. t 5 10 15 202530354045505560 65 70 75 80 85 90 95 H 3.40 3.60 3.80 4.00

LB.D 052202.M Mon Jun 03 09:27:10 2002 Page 4

NYC-WTC_000014161

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