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*Entech Analytical Labs,Inc. 525 Del Rey Avenue,Suite E <br /> Sunnyvale, CA 94086 <br /> QUALITY CONTROL RESULTS SUMMARY <br /> Volatile Organic Compounds <br /> Laboratory Control Sample <br /> QC Batch#: WMS991013 Date analyzed: 10/13/99 <br /> Matrix: Liquid Spiked Sample: Blank Spike <br /> Units: µ91L <br /> PARAMETER Method# SA 1 SR SP SP SPD SPD RPD QC LIMITS <br /> µg/L µg/L µg/L 'E %R µg/L %R RPD %R <br /> 1 i,1-Dichioroethene 8240/8260 40 ND 46.7 117 46.9 117 1 <br /> 1 � � � � � � � 0.4 25 50-150 ; <br /> ;Methyl-tert-butyl ether 8240/8260 ; 40 ND 41.0 103 52.0 ; 130 ; 23.7 25 50-150 ; <br /> ;Benzene 8240/8260 40 ND 49.8 125 50.4 126 1.2 25 50-150 <br /> 1 <br /> ;Trichloroethene 8240/8260 1 40 ND 46.4 : 116 49.5 124 6.5 1 25 : 50-150 : <br /> :Toluene 8240/8260 1 Q. 1 ND -1 47.3 : 118 1 47.4 : 119 1 0.2 1 25 1 50-150 1 <br /> - <br /> lChlorobenzene 8240/8260 ; 40 ND 45.4 114 45.7 114 1 0.7 1 25 ; 50-150 <br /> 1 O 1 1 I 1 1 1 1 I I 1 <br /> :Surro ales <br /> 1 1 I 1 I 1 1 1 1 I <br /> IDibromofluoromethane : 8240/8260 : 109% : 126% 1 1 1 1 134% 1 1 ; 65-135 1 <br /> 1 <br /> :MTBE-d3 '1 8240/8260 1 1 75% 1 100% 1 131% 1 : : 1 65-135 : <br /> :Toluene-d8 1 8240/8260 : 1 80% 1 103% 1 1 11911/0 1 : : 1 65-135 : <br /> :4-Bromofluorobenzene 8240/8260 1 71% 1 118% 1 : 119% 1 : 1 : 65-135 1 <br /> 1 1 1 1 1 1 1 1 1 1 1 i <br /> .Definition of Terms: <br /> na: Not Analyzed in QC batch <br /> SA: Spike Added <br /> SR: Sample Result <br /> RPD(%): Duplicate Analysis-Relative Percent Difference <br /> SP: Spike Result <br /> SP (%R): Spike%Recovery <br /> SPD: Spike Duplicate Result <br /> SPD(%R): Spike Duplicate%Recovery <br /> i <br />