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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 992709 Report Date 01/06/2000 ' CUSTOMER IT Group PROJECT Southland - Martinez ATTN Rhonda Teicheira QC Type Description Reag Code Lab ID Dilution Factor Date Time MS Matrix Spike 09111501 992709-4 01/04/2000 1944 Parameter/Test Description QC Result QC Result True Value Orig Value Calc Result Limits F ,Benzene 49 11 50 0 00 98 2 39-150 Ethylbenzene _ 47 42 50 0 00 94 8 32-160 Methyl-t-Butyl Ether (MTBE) 280 42 250 3 75 110 7 50-150 Toluene 47 31 50 0 00 94 6 46-148 'Xylenes (total) 151 79 150 0 00 101 2 75-125 MSD Matrix Spike Duplicate 09111501 992709-4 T 01/04/20002010 Parameter/Test Description QC Result OC Result True Value Orig Value Calc Result Limits f Benzene 49 80 49 11 50 0 00 99 6 39-150 1 20 Ethylbenzene 43 46 47 42 50 0 00 86 9 32-160 ' 9 20 Methyl-t-Butyl Ether (MTBE) 401 24 280 42 250 3 75 159 0 50-150 X 35 25 Y ne 49 67 47 31 50 0 00 99 3 46-148 5 5 20 WXYL'nes (total) 154 68 151 79 150 0 00 103 1 75-125 2 20 Test Method EPA 80216 Batch 10442 Analyst end Method Description : Volatile Organics -Aromatics Units ug/L CV t ' Calibration Verification 0911150101/05/2000 1953 Parameter/Test Description QC Result QC Result True Value Orig Value Calc Result " Limits F Benzene 49 67 50 99 85-115 Ethylbenzene 48 93 50 98 85-115 Methyl-t-ButyL Ether (MTBE) 265 28 250 106 70-130 Toluene 50 93 50 102 $5-115 Xylenes (total) 153 61 150 102 85-115 MB Method Blank 01/05/2000 2019 i, Parameter/Test Description OC Result QC Result True Value Orig Value Calc Result Limits F Benzene 0 00 Ethylbenzene 0 00 'Methyl-t-Butyl Ether (MTBE) 1 32 Toluene 0 00 xylenes (total) 0 00 I � All Page 9 %=X REC, R=RPD, A=A85 Diff ,- D-% Diff I l � Il