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I Is Q UAL I T Y C O N T R O L R ESU L T S Job Number 992707 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 MSD Matrix Spike Duplicate 09120801 992702-1 01/06/2000 0923 Parameter/Test Description QC Result QC Result True Value Orig Value Calc Result * Limits F asoline Range Petroleum Hydrocarbons 1708 1764 1000 0 874 83 50-150 3 2 30 CCV Continuing Calibration Verification 09120801 01/06/2000 1041 Parameter/Test Description QC Result QC Result True Value Orig Value Calc Result * Limits F asoline Range Petroleum Hydrocarbons 947 1000 0 95 80-120 Test Method EPA 80216 Batch 10428 Analyst evd Method Description Volatile Organics -Aromatics Units ug/L LCS Laboratory Control Sample D9111502 01/04/2000 1642 Parameter/Test Description QC Result QC ResuLt True Va€ue Orig Value Calc Result * Limits F Benzene 50 05 50 100 1 39-150 Ethylbenzene 48 70 50 97 4 32-160 ethyl t-Butyl Ether (MTBE) 230 42 250 92 2 50-150 foluene 48 60 50 97.2 46-148 ylenes (total) 155 11 150 103 4 75 125 LCD Laboratory Control Sample Duplicate 0911150211 01/04/200D 1708 Parameter/Test Description QC Result QC Result True Value Orig Value Calc Result * Limits F enzene 50 59 50 05 50 101 2 39-150 1 1 20 fEthyLbenzene 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 11 150 105.3 75-125 1 9 20 MB Method Blank 1 01/04/2000 1800 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 �es (total) 0 DO Page 7 * %_% REC, R=RPD, A=ABS Diff D=Y. Diff