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r rCommitted To)Our Cucces� Q UAL I T Y C D N T R O L R E S U L T 5 Job Number 992355 Report Date 11/10/1999 ' CUSTOMER IT Group PROJECT- Southland - Martinez ATTN Rhonda Te)che)ra QC Type Description Reag Code Lab ID Dilution Factor Date Time rCCV Continuing Calibration Verification 09090102 11/10/1999 0016 Parameter/Test Description OC Result QC Result True Value Or,g Value Calc Result * Limits F Gasoline Range Petroleum Hydrocarbons 944 1000 0 94 80-120 Test Method EPA 8OZ18 Batch 9535 Analyst tmp Method Description Volatile Organics -Aromatics Units ug/L CV Calibration Verification 09090101 11/09/1999 0931 rParameter/Test Description QC Result QC Result True Value Orig Value Calc Result * Limits F Benzene 48 78 50 98 85-115 Ethylbenzene 50 18 50 100 85-115 Methyl-t-Butyl Ether (MTBE) 246 42 250 99 70-130 Toluene 49 71 50 99 85-115 xylenes (total) 151 59 150 101 85-115 Ell Method Blank 11/09/1999 1011 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 09090101 11l09/1999 1128 ' Parameter/Test Description QC Result QC: Result True Value Orig Value Calc Result * Limits f Benzene 49 46 50 98.9 39-150 Ethylbenzene 48.91 50 97 8 32-160 ' Methyl-t-Butyl Ether (MTBE) 254 94 250 102.0 50-150 Toluene 48 97 50 97.9 46-148 xylenes (total) 147 23 150 98 2 75-125 ' LCD I Laboratory Control Sample Duplicate 09090101 11/09/1999 1153 Parameter/Test Description QC Result QC Result True Value Orig Value Calc Result " Limits f ' Benzene 50 13 49 46 50101 3 20 3 39-150 1 Ethylbenzene 49 81 48 91 50 99.6 32-160 1 8 20 Methyl-t-Butyl Ether (MTBE) 267 76 254 94 250 107 1 50-150 4 9 25 uene 49.67 48 97 50 99 3 46-148 1 4 20 ,1nes (10tal) 150 39 147 23 150 100 3 75-125 2 1 20 Page 11 * X=% REC, R=RPD, A=ABS Diff , D=% Diff. a part of 'L[ Lm ILLIUSLniLL�Ing