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Entech Analytical Labs, Inc 525 Del Rey Ave., Suite E <br /> Sunnyvale, CA 94086 <br /> QUALITY CONTROL RESULTS SUMMARY <br /> Volatile Organic Compounds <br /> QC Batch# WGCMS981222 Date analyzed 12/23/98 <br /> Matrix Water Spiked Sample Blank Spike <br /> Units ltg/L <br /> PARAMETER Method# ; SA SR SP SP SPD SPD R PD QC LIMITS <br /> pg/L µg2 ltg/L %R lag/ %R RPD I %R <br /> 1! 1-Dichloroethene ' 8'_40/$2E01 25 I ND 1 31 125 ' 32 1 127 1 1 3 1 25 1 56-150 1 <br /> 'Methyl-tert-butyl ether 19240/8260: 25 I ND 1 30 1 120 1 30 1 119 1 07 I 25 I 50-150 I <br /> 1 1 1 1 1 1 1 1 1 1 1 <br /> 'Benzene 18240/826011 25 1 ND 1 25 ' 99 1 23 1 92 1 80 ' 25 ' 50-150 ' <br /> 1 1 1 1 t 1 1 1 1 1 1 r <br /> 'Trichloroethene 18240/82601 25 1 ND ' 25 1 99 1 24 1 95 1 41 ' 25 1 50-150 <br /> 'Toluene 1 8240/82601 1 1 1; 25 1 ND 1 27 1 107 1 26 1 104 1 3 4 1 25 1 50-150 1 <br /> I <br /> �Chlorobenzene 1 8240/8260' 25 ' ND 1 25 ' 100 1 24 1 97 ' 3 2 1 25 ' 50-150 1 <br /> t 1 1 1 1 1 1 1 1 1 1 1 <br /> 1 1 1 ! 1 1 1 I 1 1 1 1 <br /> 1 1 1 1 1 1 1 1 1 1 1 1 <br /> 1 1 1 f 1 1 1 1 1 1 1 1 <br /> I 1 1 1 1 1 1 1 1 1 1 1 <br /> 1 1 1 1 1 1 1 1 1 1 1 1 <br /> 1 I 1 1 1 1 1 1 1 1 1 1 <br /> 1 f 1 1 1 1 1 1 1 1 1 1 <br /> 1 1 1 1 1 1 ! 1 1 1 1 1 <br /> 1 1 1 1 t 1 r 1 1 1 1 1 <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 /> NC Not Calculated <br /> i <br /> i <br />