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r <br /> ntech Analytical Labs,Inc 525 Del Rey Avenue,Stute E <br /> Sunnyvale,CA 94085 <br /> QUALITY CONTROL RESULTS SUMMARY <br /> METHOD Gas Chromatography <br /> QC Batch# GBG4990224 Date Analyzed 02/24/99 <br /> Matrix Water Quality Control Sample Blank Spike <br /> Uruts µP/L <br /> 1 1 , <br /> ARAMETERMethod# MB SA SR SP SP 5PI3 SPD RPD QC LDArrs <br /> 1 <br /> ' µg/L 14g2 µg/L 1 nx %R n/L %R = RPD 1 -/oR <br /> ,Benzene 8020 <050 40 ND ; 40 99 40 99 01 25 83-109 <br /> 'Toluene ; 8020 <050 40 ND ', 40 100 39 98 ; 20 25 79-112 <br /> 1 4 l 1 1 1 1 1 1 1 1 1 <br /> 'Ethyl Benzene 8020 ; <0 50 40 ND 41 104 41 102 2 1 25 82-110 <br /> "Xylenes ; 8020 1 <0 50 120 ND 124 1 103 121 101 2 25 83-110 <br /> ,'Gasoline 8015 1 <50 0 ; 500 ND 549 110 548 110 02 j 25 72-127 <br /> Note LCS and LCSD results reported for the following Parameters <br /> All <br /> 1 <br /> 1 � - <br /> Definition of Terms <br /> na Not Analyzed to QC batch <br /> MB Method Blank <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(°/aR) Spike%Recovery <br /> NC Not Calculated <br /> 1 <br />