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�r <br /> 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# GBG4980501 Date Analyzed 05/01/98 <br /> ' Matrix Water Quality Control Sample Blank Spike <br /> Units u <br /> PARAMETER Method 9 MB SA SRSP SP SPD SPD RPD QC uwu rS <br /> ' --u&—/L u u % R u %R RPD : %R <br /> iBenzene : 8020 : <0 50 : 160 : ND : 146 : 91 i 156 : 97 6 2 : 25 : 73-119 : <br /> : <br /> :Toluene i 8020 i <0 50 i 160 i ND i 143 i 90 i 155 97 75 i 25 i 75-1 I7 <br /> i i <br /> ' :Ethyl Benzene 8020 <0 50 160 ND 146 91 157 98 6 9 25 i 76-117 <br /> :Xylenes 8020 : <0 50 t 480 : ND : 450 : 94 : 495 : 103 } 9 6 : 25 : 72-I23 <br /> :Gasoline i 8015 <50 0 1000 ND i 930 i 93 i 910 91 a 2 2 i 25 60-124 <br /> Note LCS and LCSD results reported for the following Parameters <br /> ' All <br /> W <br /> cceptable LCS and LCSD results are reported when matrix interferences cause MS and MSD results tofall outside <br /> stablished 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 /> 1 <br />