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Q UAL I T Y C O N T R O L R E S U L T 5 <br /> Job Number 992705 Report Date 01/06/2000 <br /> CUSTOMER IT Group PROJECT- Southland - Martinez ATTN Rhonda Teicheira <br /> QC Type Description Reag Code Lab ID Dilution Factor Date Time <br />' CV Calibration Verification 09111501 01/06/2000 0134 <br /> ParameterlTest Description QC Result QC Result True Value Orig Value Calc Result * Limits F <br /> 81 98 85-115 <br /> 48 <br /> Benzene 50 96 85-115 <br /> Ethylbenzene 47 78 <br /> Methyl-t-Butyl Ether (MTBE) 268 19 250 107 70-135 <br /> 0 99 85-115 <br /> 49 6 <br /> Toluene 150 100 85-115 <br /> Xylenes (total) 149 81 <br /> CV Calibration Verification 09111501 01/06/2000 0227 <br />' Parameter/Test Description QC Result QC Result True Value Orig Value Calc Result * Limits F <br /> Benzene 49 49 50 99 85-115 <br /> Ethylbenzene 48 47 50 91 85-115 <br /> MethyL-t-Butyl Ether (MTBE) 253 58 250 1D1 70-130 <br /> Toluene 49 86 50 100 85-115 <br /> Xylenes (total) 151 42 150 101 85-115 <br /> 1 R S Laboratory Control Sample 09111502 01/06/2000 0805 <br /> 1,; Parameter/Test Description QC Result QC Result True Value Orig Value Calc Result * Limits F <br /> Benzene 50 47 50 100 9 39-150 <br /> Ethylbenzene 48 82 50 97 6 32-160 <br /> Methyl-t-ButyL Ether (MTBE) 279 88 250 112 0 50-150 <br /> Toluene 51 43 50 102 9 46-148 <br /> xylenes (total) 154 69 150 103 1 75-125 <br /> LCD Laboratory Control Sample Duplicate 09111562 I 1 1 01/06/2000 0830 <br /> Parameter/Test Description QC Result QC Result True Value Orig Value Calc Result * Limits F <br /> Benzene 50 17 50 47 50 100 3 39-150 <br /> 0 6 20 <br /> Ethylbenzene 48 51 48 82 50 97 0 0 6 20 2-160 <br /> Methyt-t-Butyl Ether (MTBE) 252 78 279 88 250 101 1 50-150 <br /> 10 2 25 <br />' Toluene 51 41 51 43 50 102 8 46-148 <br /> 0 0 20 <br /> Xylenes {total) 153 14 154 69 150 102 1 75-125 <br /> 1 0 20 <br /> M5 Matrix Spike 09111501 992702-1 01/06/2000 1015 <br /> Parameter/Test Description QC Result QC Result True Value Orig Value Calc Result * Limits F <br />' Benzene 63 82 50 15 15 97 3 39-150 <br /> lbenzene 52 06 50 2 56 99 0 32-160 <br /> 0 yl-t-Butyl Ether (MTBE) 1161 26 250 1043 52 47 1 50-150 x <br /> ene 51 96 50 3 73 96 5 46-148 <br />' Xylenes (total) 166 68 150 11 83 103 2 75-125 <br /> Page 9 * %=% REC, R=RPD, A=ABS Diff , D=% Diff <br />