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1 CRELA CORE LABORATORIES 0 U A L 1 T Y C O N T R O L R E S U L T S .lob Number 990932 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 LCS Laboratory Control Sample 09051202 05/27/1999 1215 Parameter/Test Description QC Result QC Result True Value Orig Value Calc Result * Limits asoline Range Petroleum Hydrocarbons 938 1000 0 93 8 50-150 ECD Laboratory Control Sample Duplicate 09051202 05/27/1999 1241 Parameter/Test Description QC Result QC Result True Value Orig Value Calc Result limits Gasoline Range Petroleum Hydrocarbons 933 938 1000 0 93 3 50-150 ' 0 5 30 M5 Matrix Spike 09051202 990942-5 05/28/1999 0050 Parameter/Test Description QC Result QC Result True Value Orig Value Calc Result * Limits Gasoline Range Petroleum Hydrocarbons i0Z5 1000 0 353 67 50-150 i D Matrix Spike Duplicate 09051202 990942-5 05/28/1999 0116 Parameter/Test Description QC Result QC Result True Value Orig Value Calc Result * Limits asotine Range Petroleum Hydrocarbons 919 1025 1000 0 353 57 50-150 10 9 30 Test Method EPA 8020A Batch 6447 Analyst evd Method Description Volatile Organics -Aromatics Units ug/L MB Method Blank 05/26/1999 1000 Parameter/Test Description QC Result QC Result True Value Orig Value Calc Result * Limits f.luene nzene 0 00 hylbenzene 0 QO thyt-t-Butyl Ether (MTBE) 0 00 0 00 Xylenes (total) 0 00 LCS Laboratory Control Sample 09043002 O5/26/1999 1329 Parameter/Test Description QC Result QC Result True Value Orig Value Calc Result * Limits nzene 49 31 50 98 6 39-150 thylbevizene 47 34 50 94 7 32-160 Methyl-t-Butyl Ether (MTBE) 252 00 250 100 8 50-150 �Were 48 83 50 97 7 46-148 lenes (total) 149 50 150 99 7 75-125 s Page 8 REC, R=RPD, A=ABS Diff D=% Diff 1 II t ' at aD xt tYit t[t tl'< ftY ti tt fµ 1� M I li rpt 1I 1 t } tnrinle r K,µr 1A; c 1i nI A t I t