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CofiLABCORE LABORATORIES Q U A L I T Y C o N 7 R O L R E S 4J L T S Job Number 990877 Report Date 05/31/1999 CUSTOMER IT Group PROJECT- Southland Martinez ATTN Shelby Lathrop QC Type Description Reag Code Lab ID Dilution Factor Date Time ' MB Method Blank I I 05/27/1949 1440 parameter/Test Description QC Result QC Result True Value Orig Value Calc Result * Limits ' Hexachlorobutadiene 0 2-Hexanone 0 lodomethane 0 1 sopropyl benzene 0 ' p-Isopropyltoluene 0 Methylene chloride 0 69 4-Methyl-2-pentanone (MIBK) 0 Naphthalene 0 n-Propylbenzene 0 Styrene 0 1,1,1,2-Tetrachloroethane 0 1,1,2,2-Tetrachloroethane 0 Tetrachloroethane 0 Toluene 0 1,2,3-Trichlorobenzene 0 1,2,4-Trichlorobenzene C 1,1,1-Trichloroethane 0 411,2-TrichLorctrifLucroothane(Frconll3) 2 Tr}chloroethane 0 chloroethene 0 chloroflueromethare (Freon 11) 0 0 1,2,3-1richlorcpropane 0 ' 1,2,4 Trimethylbenzene 0 1,3,5 Trimethylbenzene 0 Vinyl acetate 0 Vinyl chlaridc 0 m&p-Xylenes 0 o-Xylene 0 Tetrahydrofuran C MS Matrix Spike 09042404 990877-21 05/27/1999 2147 Parameter/Test Description QC Result QC Result True Value Orig Value Calc Result * Limits Benzene 12 10 10 000000 4 74 73 6 67-127 ' Chlorobenzene 13 15 10 000000 4 92 82 3 68-128 1,1-Dichloroethani- 8 02 10 000000 0 80 2 66-126 Toluene 8 87 10 000000 0 88 7 72-132 Trichloroethene 9 32 10 000000 0 93 2 74-134 MSS Matrix Spike Duplicate 09#]42404 990877-21 05/27/1999 2230 Parameter/Test Description QC Result QC Result True Value Orig Value Calc Result * Limits ' Benzene 12 28 12 10 10 000000 4 74 75 4 67-127 1 21 Chlorobenzene 13 60 3 15 10 000000 4 92 86 8 68 128 3 21 ' 1,1 Dichloroethane 8 70 8 02 10 000000 0 87 0 66 126 8 22 carne 9 01 8 87 10 000000 0 90 1 72-132 71 Page 39 * /,=/ REC, R=RPD, A=ABS Diff D=% Diff