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16 Entech Analytical Labs,Inc 525 Del Rey Avenue,Suit <br /> Sunnyvale,CA 94086 <br /> QUALITY CONTROL RESULTS SUMMARY <br /> ' METHOD Gas Chromatography <br /> QC Batch# GBG2990528 Date Analyzed 05/28/99 <br /> Matrix Water Quality Control Sample Blank Spike <br /> Units µg(- <br /> PARAMETER Method# MB SA SR SP SP I SPD SPD RPD QC LIM{T5 <br /> Vg/L pg/L 4g/L pg/L % R 3083 %R RPD' %R <br /> ' ;Benzene ; 8020 <0 50 4 5 ; ND ; 41 91 39 ; 87 50 ; 25 ; 80-11 <br /> ;Toluene 8020 <0 50 ; 25 0 ND 222 89 21 5 86 3 2 25 73-121 <br /> ;Ethyl Benzene 8020 <0 50 ; 45 ND ; 45 ; 100 ; 4 4 ; 98 ; 2 2 25 7-201 ; <br /> ' .Xylenes 8020 ; <0 50 250 1 ND ; 234 1 94 ; 22 9 92 1 2 2 25 1 75-123 <br /> ;Gasoline ; 8015 ; <50 0 500 ND ; 484 ; 97 ; 467 93 ; 3 6 ; 25 ; 75-125 ; <br /> laaa-TFT(SS)-PID 8020 105% 99% 100% 65-135 <br /> ' ;aa,-TFT(SS)-FID 8015 100% 102% 106% 65-135 <br /> Note LCS and LCSD results reported for the following Parameters <br /> All <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 /> 1 <br />