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ntech Analytical Labs,Inc. 525 Dei Rey Avenue, Suite E <br /> Sunnyvale,CA 94086 <br /> QUALI'T'Y CONTROL RESULTS SUMMARY <br /> METHOD Gas Chromatography <br /> QC Batch# GBG4980826 Date Analyzed 08/26/98 <br /> Matrix Soil Quality Control Sample E15480 <br /> Units HOME <br /> PARAMETER Method# MB SA SR SP SP SPD SPD RPD QC LIMITS <br /> u u4 u u % R u %R RPD r °foR <br /> :Benzene t 8020 i <5 0 r 80 r ND i 85 r 106 t 85 r 107 r 06 + 25 r 76-117 t <br /> :Toluene 8020 <5 0 : 80 : ND 84 : 106 : 84 : 106 : 0 0 : 25 : 76-117 : <br /> t i t t r i r t t t r t t <br /> :Ethyl Benzene 8020 <5 0 r 80 t ND 89 t 111 87 k 109 t 16 t 25 r 74-119 <br /> t t i t t i t t r r t r t <br /> :Xylenes t 8020 i <5 0 r 240 r ND i 250 r 104 t 251 r 104 r 02 t 25 r 75-120 i <br /> ,Gasoline 8015 <1000 00 1000 : ND 1110 111 1170 117 53 : 25 : <br /> r 58-120 t <br /> Note LCS and LCSD results reported for the following Parameters <br /> Gasoline <br /> 4cLCS and LCSD results are reported when matrix interferences cause MS and MSD results to fall outside <br /> lablished QC limits <br /> Definition of Terms <br /> na Not Analyzed in QC batch <br /> MB Method Blank <br /> SA Spike Added <br /> SR Sample Resuit <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 />