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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# WGCMS981217 Date analyzed 12/18/98 <br /> Matrix Water Spiked Sample Blank Spike <br /> Units Pg/L <br /> PARAMETER Method# ' SA SR SP SP SPD SPD RPD QC LIMITS <br /> gg/L l.ig/L µg/L %R gg/L %R RPD I %R <br /> 11,t-Dichloioethene 1 8240/82601 25 1 ND 1 23 1 92 1 24 1 95 1 26 1 25 I 50-150 1 <br /> Meth I tert-bu 1 ether 8240/82601 25 1 ND 1 24 1 98 27 106 8 3 1 25 1 50-150 ` <br /> , ' 1, , , , , , , , , , <br /> Benzene ; 8240/8260; 25 ND 23 92 24 94 26 25 50-150 <br /> , <br /> ITnchloroethene 18240/82601 25 I ND 1 27 1 108 1 28 1 114 1 51 1 25 1 50-150 1 <br /> , , , , , , , , , , , , <br /> 'Toluene 18240/82601 25 ' ND ' 26 1 104 1 26 ' 106 ' I 1 i 1 <br /> , 25 50-150 <br /> ' 1 <br /> ,Chlorobenzene , 8240/8260, 25 , ND , 25 , 102 , 26 103 16 25 50-150, <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 />• <br />