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C HLAB <br /> CORE LABORATORIES <br /> Q U A L I T Y C 0 N T R 0 L R E S U L T S <br /> ,lob Number 991123 Report Date 06/30/1999 <br /> CUSTOMER IT Group PROJECT. Southland - Martinez ATTU Shelby Lathrop <br /> QC Type Description Reag Code Lab 1D Dilution Factor Date Time <br /> LCS Laboratory Control sample 09062503 06/29/1999 1829 <br /> Parameter/Test Description QC Result QC Result True Value Orig Value Calc Result * Limits F <br /> Ienzene 46 79 50 93 6 39-150 <br /> thytbenzene 44 39 50 88 8 32-160 ^ <br /> Methyl-t-Butyl Ether (MTBE) 321 23 250 128 5 50-150 <br /> l oLuene <br /> 45 83 50 91 7 46-148 <br /> ylenes (total) 139 46 150 93 0 75-125 <br /> � LCo Laboratory Control Sample Duplicate 09062503 06/29/1999 1855 <br /> Parameter/Test Description QC Result QC Result True Value Orig Value Calc Result * Limits F <br /> Benzene 48 97 46 79 50 97 9 39-150 <br /> 'thylbenzene 46 50 44 39 50 93 0 2032-160 <br /> 4 6 20 <br /> Methyl-t-Butyl Ether (MTBE) 324 41 321 23 250 129 8 50-150 <br /> 1 0 25 <br /> kene 48 20 45 83 50 96 4 46-148 <br /> 5 0 20 <br /> Imes (total) 146 14 139 46 150 97 4 75-125 <br /> 4 7 20 <br /> M5 Matrix Spike 09062503 991123-2 06/30/1999 0641 <br /> Parameter/Test Description QC Result QC Result True Value Orig Value Calc Result * Limits F <br /> nzene 39 76 50 0 00 79 5 _ 39-150 <br /> hylbenzene 35 91 50 0 00 71 8 32-160 <br /> Methyl-t-Butyl Ether (MTBE) 289 30 250 0 51 115 5 50-150 <br /> oluene 38.64 50 0 00 77 3 46-148 <br /> lenes (total) 125 05 150 0 00 83 4 75-125 <br /> MSD Matrix Spike Duplicate 09062503 991123-2 06/30/1999 0707 <br /> Parameter/Test Description QC Result QC Result True Value Orig Value Calc Result * Limits F <br /> Benzene 40 20 39 76 50 0 00 80 4 39-150 <br /> 1 20 <br /> hylbenzene 31.94 35 91 50 0 00 63 9 32-160 <br /> 12 20 <br /> Methyl-t-Butyl Ether (MTBE) 296 14 289 30 250 0 51 118 3 50-150 <br /> 2 25 <br /> Luene 38 26 38 64 50 0 00 76 5 46-148 <br /> 20 <br /> Lenes (total) 128 18 125 05 150 0 00 85 5 75-125 <br /> 2 20 <br /> Page 15 <br /> REC, R=RPD, A=ABS Diff , D Diff <br /> eh,a V1101—111 1o1115 b NI P alat—Co 111.E.,I 5 repol aze owed soon ulama L aMrla[e MI suPpl etl dy I asonenl b whose eKtlu....Confd '-use to 9 BPW 1y been Itwtle Tne eh mwm e9Nie a ..a Mega ,ions <br /> ggaJ SBP egen[[W bell lasgmsnt of Cas Labor,--cIXe LaDordtOnes however males n�w a rapresenl atwn s orbs!IX xnMwd M usy type snd exp...11 di ..—aame a9 to SM aP.1-1y MOPE/O .t Ons a p�Ottaglenas., <br /> dM dl gas Gaal Or Olne n a[prWe IV yell Cr s Intl in co—1 nn wM wh cn s..cn letton s Dr Ned upon 10 any a whalsearet This repot&W1 not ba reModmw n w q a x[Os I wl O t the us nen approval al C—I bwato e <br />