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I 10 tQ UAL I T Y C O N T R O L R E S U L T S Jab Number : 992528 Report Date . 12/14/1999 ' CUSTOMER IT Group PROJECT- Southland - Martinez ATTN Rhonda Teicheira QC—TY I- L- pe Description Reag Code Lab iD Dilution Factor Date Time LCD Laboratory Control Sample Duplicate 09111502 12/07/1999 1416 Parameter/Test Description QC Result QC Result True Value Orig. Value Calc Result * Limits F 'Toluene 51 68 52 09 50 103 4 46-148 0 8 20 Xylenes (total) 157 77 158 55 150 105 2 75-125 0 5 20 MS Matrix Spike O9102802A 992549-7 12/07/1999 1652 Parameter/Test Description QC Result QC Result True Value Orig Value Calc Result * Limits F ,Benzene 50 57 50 0 101 1 39-150 Ethylbenzene 51 14 50 0 102 3 32-160 ,Mellyl-,-Ilulyl Ether (MTBE) 271 50 250 0 108 6 50-150 Toluene 50 72 50 0 101 4 46-148 Xylenes (total) 154 78 150 0 103 2 75-125 ' Matrix Spike Duplicate 09102802-A 992549-7 T 12/07/1999 1717 Parameter/Test Description QC Result QC Result True Value Orig Value Calc Result * Limits F ,Benzene 51 68 50 57 50 0 103 4 39-150 2 20 Ethylbenzene 52 17 51 14 50 0 104 3 32-160 2 20 Methyl-t-Butyl Ether (MTBE) 290 44 271 50 250 0 116 2 50-150 7 25 Toluene 51 57 50 72 50 0 103 1 46-148 2 20 Xylenes (total) 157 92 154 78 150 0 105 3 75-125 2 20 Test Method EPA 80218 Batch 10037 Analyst evd Method Description Volatile Organics Aromatics units ug/L MB Method Blank I I 1 1 12/08/1999 1000 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) 1109 'Toluene 0 00 Xylenes (total) 0 00 r Page 10 * 76=X REC, R=RPD, A=ABS Diff D=% Diff. r