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• Q UAL I T Y C O N T R O L R E S U L T S Job Number 992528 Report Date 12/14/1999 CUSTOMER. IT Group PROJECT- Southland - Martinez ATTN- Rhonda Teicheira QC Type Description Reag Code Lab ID Dilution Factor Date Time MS Matrix Spike 09102203 992528-3 12/06/1994 1229 Parameter/Test Description QC Result QC Result True Value Orig Value Calc Result * Limits F �asoline Range Petroleum Hydrocarbons 3341 1000 0 2183 116 _ 50-150 ' MSD Matrix Spike Duplicate 09102203 992528-31 - 1 12/06/1999 1255 Parameter/Test Description QC Result QC Result True Value Orig Value Calc Result * Limits F Gasoline Range Petroleum Hydrocarbons 3217 3341 1000 0 2183 103 50-150 3 8 30 MB Method Blank 1 12/06/1999 1415 Parameter/Test Description QC Result QC Result True Value Orig Value Calc Result * Limits F Gasoline Range Petroleum Hydrocarbons 2 ' st Method EPA 8021B Bacch 10008 Analyst evd Method Description Vola tile Organics -Aromatics Units ug/L M8 Method Blank 12/07/1999 1233 Parameter/Test Description QC Result QC Result True Value Orig Value Calc Result * Limits F Benzene 0 00 Ethylbenzene 0 00 Methyl-t-Butyl Ether (MTBE) 0 00 Toluene 0 00 'Xylenes (total) 0 00 LCS Laboratory Control Sample 09111502 j 12/07/1999 1350 Parameter/Test Description QC Result QC Result True Value Orig Value Calc Result * Limits F Benzene 52 02 50 104 0 39-150 Ethylbenzene 52 26 50 104 5 32-160 Methyl-t-Butyl Ether (MTBE) 345 11 250 138 0 50-150 ' Toluene 52 09 50 104 2 46-148 Xylenes (total) 158 55 150 105 7 75-125 LCD Laboratory Control Sample Duplicate 09111502 12/07/1999 1416 Parameter/Test Description QC Result QC Result True Value Drig Value Calc Result * Limits F Benzene 51 91 52 02 50 103 8 _ 39-150 0 2 20 dl ,benzene 52 11 52 26 50 104 2 32-160 0.3 20 yl-t-Butyl Ether (MTBE) 321 84 345 11 250 128 7 50-150 7 0 25 Page 9 * %=% REC, R=RPD, A=ABS Diff , D=% Diff