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*Entech 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# GBG5970625 Date Analyzed 06/25/97 <br /> Matrix Water Quality Control Sample Blank Spice <br /> Units µg/L <br /> QC LIMITS <br /> PARAMETER Method# MB SA SR SP SP SPD SPD RPD (ADVISORY) <br /> µg/L Pg/L µg/L µ1 / %R gg/L %R RPD 1 %R <br /> (Benzene 1 8020 1 <0 5 1 25 1 ND i 26 8 1 107 1 28 3 1 113 I 55 1 25 I 50-150 I <br /> I I <br /> :Toluene I 8020 1 <0 5 i 25 i ND i 232 1 93 I 242 1 97 I 46 1 25 I 50-150 1 <br /> :Ethyl Benzene I 8020 1 <0 5 i 25 i ND I 246 1 98 I 254 i 102 i 34 1 25 1 50-150 1 <br /> I I I i I I I 1 I I i 1 <br /> Xylenes I 8020 1 <0 5 1 75 i ND I 68 i 91 I 69 I 92 i 15 1 25 i 50-150 1 <br /> Gasoline i 8015 i <50 0 i 625 ND i 601 i 96 629101 i 4 6 I i 1 <br /> I i I 25 i 50-150 1 <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 Spice Result <br /> SP(%R) Spite%Recovery <br /> SPD Spice Duplicate Result <br /> SPD(%R) Spike%Recovery <br /> NC Not Calculated <br /> • <br />