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r. <br /> i <br /> Q UAL I T Y C O N T R O L R E S U L T S <br /> Job Number 992528 Report Date 12/14/1999 <br /> rCUSTOMER IT Group PROJECT- Southland - Martinez ATTN Rhonda Teicheira <br /> QC Type Description Reag Code Lab 1D Dilution Factor Date Time <br /> rLCD Laboratory Control Sample Duplicate 09119502 12/06/1999 1135 <br /> Parameter/Test Description QC Result QC Result True Value Orig. Value Calc Result * Limits F <br />�enzene 54.27 57 42 50 108 5 39-150 <br /> 5 6 20 <br /> Ethylbenzene 52.76 56.00 50 105 5 32-160 <br /> 6 0 20 <br /> ethyl-t-Butyl Ether (MTBE) 266 83 291 63 250 106 7 50-150 <br /> 8 9 25 <br /> Toluene 54 51 58 15 50 109 0 46-148 <br /> 6 5 20 <br /> xylenes (total) 167 14 178 02 150 111 4 75-125 <br /> 6 3 20 <br /> MS Matrix Spike 09102802A 992528-3 12/06/1999 1322 <br /> Parameter/Test Description OC Result QC Result True Value Orig Value Calc Result * Limits f <br /> B ene 56 91 50 0 00 113 8 J 39-150 <br /> benzene 55 56 50 7 27 96 6 32-160 <br /> l-t-Butyl Ether (MTBE) 4266 88 250 3983 51 113 3 50-150 <br /> Toluene 53 93 50 3 95 100 0 46-148 <br /> Xylenes (total) 163 35 150 1 60 107 8 75-125 <br /> MSD Matrix Spike Duplicate 09102802A 992528-3 T <br /> 12/06/1999 1348 <br /> Parameter/Test Description QC Result OC Result True Value Or,9 Value Calc Result * Limits F <br />'Benzene 56 98 56 91 50 0 00 114 0 39-150 <br /> 0 20 <br /> Ethylbenzene 55 42 55 56 50 7 27 96 3 32-160 <br /> 0 20 <br /> Methyl-t-Butyl Ether (MTBE) 4501 87 4266 88 250 3983 51 207 3 50-150 X <br /> 5 25 <br /> Toluene 53 77 53 93 50 3 95 99 6 46-148 <br /> 0 20 <br /> Xylenes (total) 162 93 163 35 150 1 60 107 6 75-125 <br /> 0 20 <br /> MB Method Stank 12/06/1999 1415 <br /> Parameter/Test Description QC Result QC Result True Value Orig Value Calc Result * Limits F <br /> Benzene 0 00 <br /> Ethylbenzene 0 OD <br /> Methyl-t-Butyl Ether (MTBE) 0 00 <br /> Toluene 0 00 <br /> Xylenes (total) 0.00 <br /> 1 <br /> 0 <br /> Page 14 * %=X REC, R=RPD, A=ABS Diff , D=% Diff <br /> r <br />