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T Y C O N T R O L R E S U L T S Job Number 992528 Q UAL I Report Date 12/14/1999 CUSTOMER IT Group PROJECT* Southland - Martinez ATTN Rhonda Teicheira QC Type Description Reag Code Lab ID Dilution Factor F Date Time MS Matrix Spike 09102802A 992530 1 12/04/1999 0636 Parameter/Test Description QC Result QC Result True Value 0rig Value Calc Result * limits F Benzene 51 20 50 0 46 101 5 39-150 Ethylbenzene 50 89 50 0 00 101 8 32-160 Methyl-t-Butyl Ether (MTBE) 228 20 250 0 00 91 3 50-150 ,Toluene 50 21 50 0 21 100 0 46-148 Xylenes (total) 157 93 150 0 16 105 2 75-125 MSD Matrix Spike Duplicate 09102802A 992530-1 T 12/04/1999 0702 Parameter/Test Description QC Result QC Result True Value Orig Value Calc Result * Limits F Benzene 50 93 51 20 50 0 46 100 9 39-150 1 20 'Ethylbenzene 50 43 50 89 50 0 00 100 9 32-160 1 20 Methyl-t-Butyl Ether (MTBE) 234 46 228 20 250 0 00 93 8 50-150 3 25 ne 50 02 50 21 50 0.21 99 6 46-148 0 20 Xylenes (total) 156 73 157 93 150 0 16 104 4 75-125 1 20 Test Method EPA 80216 Batch 9970 Analyst. evd Method Description Volatile Organics -Aromatics Units ug/L MB Method Blank I 1 1 12/06/1999 0925 Parameter/Test Description QC Result QC Result True Value Orig Value Calc Result * Limits F rBenzene 0 00 Ethylbenzene 0 00 Methyl-t-Butyl Ether (MTBE) 0 00 Toluene 0 21 Xylenes (total) 0 09 LC5Laboratory Control Sample 09111502 12/06/1499 1109 Parameter/Test Description QC Result QC Result True Value Orig Value Calc Result * Limits F Benzene 57 42 50 114 8 39-150 Ethylbenzene 56 00 50 112 0 32-160 'MethyL-t-Butyl Ether (MTBE) 291 63 250 116 7 50-150 Toluene 58 15 50 116 3 46-148 Xylenes (total) 178 02 150 118.7 75-125 i 1 Page 13 X=X REC, R=RPD, A=ABS Diff , D=% Diff.