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SEntech Analytical Labs, Inc. Re 525 Dei <br /> y Avenue, Suite E <br /> Sunnyvale, CA 940$6 <br /> QUALITY CONTROL RESULTS SUMMARY <br /> METHOD Gas Chromatography <br /> QC Batch# GBG4981202 Date Analyzed 12/02/98 <br /> Units Matrix µg2.Water Quality Control Sample Blank Spike <br /> PARAMETER Method# : MB ' <br /> SA SR SP SP SPD SPD RPD QC LIMITS <br /> w` Ia911- 99/L Its % R pg/L %R RPD 1 %R <br /> 'Benzene 8020 1 <0 50 1 40 ND 1 39 98 1 40 101 2 6 1 25 1 85-108 <br /> (Toluene 8020 : <0 50 : 40 1 ND : 39 1 98 40 101 3 4 25 85-108 <br /> 'Ethyl Benzene 8020 <0 50 40 ND 39 98 39 98 0 8 25 86-107 <br /> ,'Xylenes 8020 1 <0 50 120 ND 117 1 97 119 99 1 8 25 87-108 1 <br /> :Gasoline 80I5 : <50 0 : 500 ND 521 104 474 95 9 6 25 82-128 <br /> Note LCS and LCSD results reported for the following Parameters <br /> Al! <br /> Acceptable LCS and XSD results are reported when matrix interferences cause MS and MSD results to fall outside <br /> lestabltshed QC limits <br /> Definition of Terms <br /> na Not Analyzed in 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(%R) Spike%Recovery <br /> NC Not Calculated <br />