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Entech Analytical Labs, Inc 525 Del Rey Avenue,Suite E <br /> iSunnyvale,CA 94086 <br />' QUALITY CONTROL RESULTS SUMMARY <br /> r" <br /> METHOD Gas Chromatography <br /> QC Batch# GBG2990120 Date Analyzed 01/20/99 <br /> Matrix Water Quality Control Sample Blank Spike <br /> Units µg/L <br /> PARAMETER Method# MB SA SR SP SP SPD SPD RPD QC LIMITS <br />' Vg/L µ�l• !1 ply % R n/L %R RPD 1 %R <br /> ,Benzene 1 8020 1 <0 50 1 40 ND 40 100 1 39 97 32 1 25 1 75-116 1 <br /> ;Toluene8020 <0 50 40 ND 40 100 39 98 1 1 25 76-116 ; <br /> 1 <br /> ;Ethyl Benzene 8020 <0 50 40 1 ND 1 40 99 39 97 1 2 0 25 80-113 I <br /> 'Xylenes I 8020 1 <050 1 120 1 ND 1 120 1 100 1 120 1100 1 04 1 25 1 79-115 <br /> k _ <br /> ,Gasoline , 8015 1 <50 0 1 500 , ND , 538 , 108 , 600 , 120 1 101 1 25 , 76-127 , <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 jL1SD results to fall outside <br /> established QC limns <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-ReIative 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 /> 1 <br />