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E ntech Analytical Labs, Inc. 525 Del Rey Avenue,Suite E <br /> Sunnyvale,CA 94086 <br /> QUALITY CONTROL RESULTS SUMMARY <br /> METHQD Gas Chromatography <br /> QC Batch# GBG2990623 Date Analyzed 06/23/99 <br /> Matrix Water Quality Control Sample Blank Spike <br /> Units I Lg/L <br /> PARAMETER Method# MB SA SR SP SP SPD SPD RPD QC LIMITS <br /> µgfL pgfl- �19(L 99/L % R µL/ %R RPD J1 %R <br /> Benzene 8020 1 <0 50 50 ND 1 4 4 1 88 1 4 2 83 15 1 l 25 73-117 <br /> 1 , 1 <br /> 1 1 I i 1 1 1 1 <br /> ;Toluene 1; 8020 1 <0 50 250 ; ND 27 1 I 1 107 ; 27 109 ; 2 1 1 ; 25 78-122 ; <br /> ;Ethyl Benzene 8020 <0 50 ; 5 0 ; ND 5 2 ; 104 5 3 11; 2 5 ; 25 1 IP <br /> ; <br /> Xylenes 1 8020 1 <0 50 1 250 ND 28 113 29 1 115 1 2 1 35 1 79-120 <br /> Gasoline 8015 <50 0 500 ND 481 ; 96 ; 478 ; 96 , 1 1 0 6 1 25 1 75-125 ; <br /> taaa-TFT(SS)-PID E 8020 1 101% 100°0 101% 65-135 <br /> ,aaa-TFT(SS)-F1D 8015 104% 103°J0 103% 65-135 <br /> ,Vote LCS and LCSD results reported for the following Parameters <br /> 411 <br /> 0 <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 />