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Entech Artalyhcal Labs,Inc. 525 Del Rey Avenue,State E <br /> Sunnyvale,CA 94086 <br /> QUALITY CONTROL RESULTS SUMMARY <br /> Volatile Organic Compounds <br /> Laboratory Control Sample <br /> QC Batch# WGCMS990927 Date analvzed 09/27/99 <br /> Matrix Water Spiked Sample Blank Spike <br /> Units µg/L <br /> PARAMETER Method# SA SR SP SP SPD SPD RPD QC LIMITS <br /> µg/L µg/L 1.tg/L %R µg/L %R RPD l %R <br /> 1 1-Dichloroethene 8240/8260 1 25 1 ND 234 1 94 23 6 94 0 9 25 50-150 1 <br /> ,Methyl-tort-butyl ether 8240/8260 25 ND 23 7 95 25 0 100 f 5 3 25 50-150 ; <br /> ;Benzene 8240/8260 25 ND 25 6 102 25 6 102 0 0 25 50-150 <br /> /Trichloroethene 8240/8260 25 ND 266 106 269 108 i 1 1 1 25 50-150 <br /> Toluene 8240/8260 25 ND 249 100 25 2 101 l 2 25 50-150 <br /> :Chlorobenzene 8240/8260 25 ND 245 98 24 8 99 12 25 ; 50-150 <br /> ;Dibromofluoromethanc 8240/8260 + 89% 910/. 920/a 65-135 <br /> MTBE-0 8240/8260 88% 98°/0 1040'0 65-135 <br /> 1 <br /> /Toluene-d8 8240/8260 109% 111°0 1100/0 I l 65-115 <br /> i <br /> 14-Bromofluorobenzene ; 8240/8260 ; ; 1090/,. ; 1130a ; ; 1100/,, ; ; 65-135 <br /> Definition of Terms <br /> na Not Analwed in QC batch <br /> SA Spike Added <br /> SR Sample Reault <br /> RPD(%) Duplicate Analysis-Relative Percent Difference <br /> SP Spixe Result <br /> SP(%R) Spike%Recovery <br /> SPD Spike Duplicate Result <br /> SPD(o/oR) Spike Duplicate%Recovery <br /> I <br />