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Entech Analytical Labs, Inc <br /> SZS Del Rey Aye., Suite E <br /> Sunnyvale, CA 94086 <br /> QUALITY CONTROL RESULTS SUMMARY <br /> Volatile Organic Compounds <br /> QC Batch 9 WGCMS9812 13 Date analyzed 12/14/98 <br /> Matrix Water Spiked Sample Blank Spike <br /> Units 4g1L <br /> PARAMETER Method# ; SA SR SP SP SPD SPD RPD QC LIMITS <br /> 491L 49/L 99/L %R µg- %R RPD , %R <br /> Dichloroethene 8240/8260 25 1 ND 24 <br /> Methyl-tent-butyl ether 1 8240/8260 29 25 ND 1 95 23 94 1 7 25 50-150 I <br /> 1]6 31 + 122 5 4 1 25 1 50-I 50 <br /> ,Benzene ; 8240/ 8260; 25 1 ND 23 91 23 91 0 4 1 25 ; 50-150 <br /> ;Trichloroethene ; 8240/8260; 25 ND 1 25 100 27 107 ' <br /> l � � ; 6 9 25 ; 50-150 ; <br /> !Toluene 8240/8260 25 ; ND ; 24 ; 98 ; 25 1 102 4 0 25 50-150 <br /> �Chlorobenzene 1 8240/8260 1 25 11ND 1 24 1 95 1 25 199 3 7 25 50-150 <br /> I <br /> i <br /> Definition of Terms <br /> na Not Analyzed in QC batch <br /> SA Spike Added <br /> SR Sample Result <br /> RPD(%) Duplicate Analysts-Relative Percent Difference <br /> SP Spike Result <br /> SP(%R) Spike ?'o Recovery <br /> SPD Spike Duplicate Result <br /> SPD(%R) Spike Duplicate%Recovery <br /> NC Not Calculated <br /> i <br />