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ntech Analytical Labs,Inc. 525 Del Rey Avenue,Suite E <br /> Sunnyvale,CA 94086 <br /> QUALITY CONTROL RESULTS SUMMARY <br /> METHOD Gas Chromatography <br /> QC Batch 9 GBG4981214 Date Analyzed 12/14/98 <br /> Matrix Water Quality Control Sample Blank Spike <br /> Units pg/L <br /> : <br /> PARAMETER : Method# : MB SA SR SP : SP : SPD : SPD RPD QC LIMITS <br /> gg/L lal µ�L !��- % R µ %R RPD I %R <br /> BenzeneI 8020 I <0 50 I 40 ND 40 1 100 l 39 I 98 I 2 0 I 25 I 82-110 <br /> ;Toluene 8020 <0 50 1 40 ND 41 1 101 39 98 3 5 25 83-109 ; <br /> ;Ethyl Benzene I 8020 I <0 50 40 ND I 39 I 98 38 96 1 1 5 I 25 84-108 I <br /> 'Xylenes 8020 <0 50 120 ND 118 98 114 95 2 8 1 25 1 85-108 <br /> 1Gasohne 1 8015 1 <50 0 1 500 1 ND 1 527 1 105 1 527 1 105 1 01 1 25 1 84-127 <br /> Note LCS and LCSD results reported far the following Parameters <br /> All <br /> Aceptable LCS and LCSD results are reported when matrrx interferences cause MS and MSD results to fall outside <br /> PS' <br /> tablished 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 /> �5 <br />