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qeEntech 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# GBG2981229 Date Analyzed 12/29/98 <br /> Matrix Water Quality Control Sample Blank Spike <br /> Units µ - <br /> 1 PARAMETER Method MB SA SR SP SP SPD SPD RPD QC LIMITS <br /> lam µ� µ� µ� t % R 119/1- %R ; RPD ; %R <br /> 1Benzene 8020 1 <0 50 40 I ND 1 35 88 36 1 90 1 15 25 1 76-112 <br /> ' , <br /> 1 < 1 1 ND 1 36 1 90 37 92 1 2 2 1 25 78-112 , <br /> ;Toluene 8020 0 50 , 40 , <br /> ' ' <br /> ;Ethyl Benzene ; 8020 ; <0 50 ; 40 1 ND ; 36 1 90 ; 38 94 4 5 1 25 ; 77-114 <br /> ',Xylenes 8020 1 <0 50 1 120 ND 1 108 1 90 1 112 93 32 25 78-114 <br /> ' ;Gasoline 8015 <50 0 500 11ND472 94 462 92 23 25 71-114 <br /> Note LCS and LCSD results reported for the following Parameters <br /> ' All <br /> Acceptable LCS and LCSD results are reported when matrrx 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 Analysts-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 />