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r <br /> 1 ntech Analytical Labs, Inc 525 Del Rey Avenue,Suite E <br /> Sunnyvale, CA 94086 <br /> QUALITY CONTROL RESULTS SUMMARY <br /> f' <br /> METHOD Gas Chromatography <br /> QC Batch 4 GEG4990305 Date Analyzed 03/05/99 <br /> Matrix Water Quality Control Sample Blank Spike <br /> Units pg/L. <br /> PARAMETER Method# : MB SA SR SP SP SPD SPD RPD QC LIMI'T'S <br /> ilam Ili kg/L Ag/L % R µg/L : %R RPD 1 %R <br /> Benzene 8020 <0 50 40 1 ND 35 87 38 1 95 82 25 1 82-110 l <br /> iToluene 8020 <0 50 40 ND 35 87 39 97 102 25 80-111 = <br /> ,Ethyl Benzene 8020 <0 50 40 ND ', 36 90 38 95 54 25 81-111 <br /> 1Xylenes 1 8020 1 <0 50 1 120 1 ND 1 108 1 90 1 114 1 95 6 25 81-111 <br /> ;Gasoline 8015 <50 0 500 ND 508 102 542 108 65 25 70-132 ; <br /> iNote LCS and LCSD results reported for the following Parameters <br /> All <br /> i <br /> i • <br /> Definition of Terms <br /> na Not Analyzed in QC batch <br /> MB Method Blank <br /> i 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 /> t <br />