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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# GBG4980515 Date Analyzed 05/15/98 <br /> Matrix Water Quality Control Sample Blank Spike <br /> Units u <br /> PARAMETER Method# MB SA SR SP SP SPD SPD RPD QC LMTS <br /> u u u u % R u %R RPD I %R <br /> (Benzene 1 8020 1 <0 50 1 80 1 ND 1 79 1 99 1 75 1 93 1 60 I 25 1 74-118 ! <br /> ,,Toluene 1 8020 ! <0 50 ,, 80 1 ND ,, 77 I 97 I 75 I 94 1 2 8 I 25 I 75-116 1 <br /> 1 I I I T 1 I 1 I I 1 1 <br /> , <br /> ,Ethyl Benzene 1 8020 , <0 50 1 80 I ND , 78 I 97 1 75 1 94 I 37 1 25 1 76-117 1 <br /> (Xylenes 1 8020 1 <0 50 1 240 1 ND 1 237 1 99 1 226 1 94 1 47 1 25 1 73-121 1 <br /> Gasoline 8015 i <50 0 E 1000 i ND 970 97 ', 920 _ i 92 i 53 i 25 61-124 1 <br /> 1 <br /> Note LCS and LCSD results reported for the following Parameters <br /> All <br /> Acceptable LCS and LCSD results are reported when matrix interferences cause MS and MSD results to fall outside <br /> established 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 />