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i Q UAL ! T Y C O N T R O L R E S U L T S Job Number 992705 Report Date 01/06/2000 CUSTOMER ET Group PROJECT- Southland - Martinez ATTN Rhonda Teichelra CC Type Description Reag Code Lab 10 Dilution Factor Date Time MSD Matrix Spike Duplicate 09120801 992702-1 01/06/20000923 Parameter/Test Description QC Result OC Result True Value Orig Value Calc Result * Limits F Gasoline Range Petroleum Hydrocarbons 1708 1764 1000 0 874 83 50-150 3 2 30 ' CCV Continuing Calibration Verification 09120801 1 01/06/2000 1041 Parameter/Test Description DC Result CC Result True Value Orig Value Calc Result " Limits F Gasoline Range Petroleum Hydrocarbons 947 1000 0 95 80-120 Test Method EPA 80218 Batch 10428 Analyst evd Method Description Volatile Organics -Aromatics Units ug/L LCS Laboratory Control Sample 09111502 01/04/2000 1642 Parameter/Test Description QC Result CC Result True Value Orig Value Calc Result * Limits F Benzene 50 05 50 100 1 39-150 Ethylbenzene 48 70 50 97 4 32-160 Methyl-t-Butyl Ether (MTBE) 230 42 250 92.2 50-150 Toluene 48 60 50 97 2 46-148 Xylenes (total) 155 11 150 103 4 75-125 ' LCD Laboratory Control sample Duplicate 09111502 01/04/2000 1708 Parameter/Test Description CC Result OC Result True Value Orig Value Calc Result _ Limits F Benzene 50 59 50 05 50 1D1 2 39-150 1 1 2D Ethylbenzene 49 37 48 70 50 98 7 32-160 1 4 20 Methyl-t-Butyl Ether (MTBE) 254 31 230 42 250 101 7 50-150 9 9 25 ' Toluene 49 34 48 60 50 98 7 46-148 1.5 20 Xylenes (total) 158 02 155 11 150 105 33 2075-125 MB Method Blank 1 01/04/2000 1800 Parameter/Test Description CC Result CC 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 nes {total} 0 00 1 Page 7 * X% REC, R=RPD, A=ABS Diff D=% Diff.