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IEntech Analytical Labs,Inc 525 Del Rey Avenue,Suite E <br /> Sunnyvale, CA 94086 <br /> QUALITY CONTROL RESULTS SUMMARY <br /> IMETHOD Gas Chromatography <br /> QC Batch# GSG2990330 Date Analyzed 03/30/99 <br /> Matnx Water Quality Control Sample Blank Spike <br /> Units .1t1/L <br /> PARAMETER Method# MB SA SR SP SP SPD SPD RPD QC LIMITS <br /> 111 p 119/1- 1191L %R 3083 %R RPD 1 %R <br /> lBenzene 8020 l <0 50 l 40 I ND l 37 l 93 l 37 92 1 10 25 82-116 l <br /> S , 1 l <br /> 'Toluene 1 8020 1 <0 50 l 40 1 ND 1 38 1 95 l 38 94 l 1 1 l 25 l 83-115 I <br /> I , <br /> 'Ethyl Benzene l 8020 l <0 50 l 40 l ND l 37 l 93 l 36 1 90 l 29 l 25 l 83-116 l <br /> 'Xylenes l 8020 1 <0 50 l 120 l ND l 113 l 94 l 114 l 95 l 1 1 l 25 l 84-115 l <br /> ;Gasoline 8015 1 X50 0 1 500 1 ND 1 603 1 121 1 481 1 96 1 225 1 25 1 75-125 1 <br /> Note LCS and LCSD results reported for the following Parameters <br /> All <br /> 3 <br /> Definition of Terns <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 /> 1 <br /> 1 <br />