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• Entech Analytical Labs, Inc 525 Del Rey Ave, Suite E <br /> Sunnyvale, CA 94086 <br /> QUALITY CONTROL RESULTS SUMMARY <br /> Volatile Organic Compounds <br /> QC Batch# HexaneW980708 Date analyzed 07/08/98 <br /> Matrix Water Spiked Sample E12445 <br /> Units <br /> PARAMETER Method# SA SR SP SP SPD SPD RPD QC LIMITS <br /> %R %R RPD I %R <br /> IHexane ! 624 I 20 I ND I 19 I 97% 1 21 1 104% 1 75 1 25 1 70430 I <br /> 1 I I <br /> 'Hepwe 1 624 ' 20 1 ND ' 17 ' 85% ' 18 ' 90% ' 63 ' 25 ' 70-13U ' <br /> I I I I l I I I I <br /> Wethylcyclohexane 1 624 1 20 1 ND 1 19 I 93% I 20 I 99% I 68 1 25 ! 70-130 1 <br /> 1 I I I I I I I 1 I I I <br /> I I I 1 I I 1 I I I I I <br /> I I I ! I I I t ! I I I <br /> • <br /> Definition of Terms <br /> na Not Analyzed in QC batch <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 Duplicate%Recovery <br /> NC Not Calculated <br /> J u L 2 0 1998 <br />