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�Entech Analytical Labs,Inc 525 Del Rey Avenue,State E <br /> Sunnyvale,CA 94086 <br /> QUALITY CONTROL RESULTS SUMMARY <br /> METHOD Gas Chromatography <br /> QC Batch 9 GBG5970625 Date Analyzed 06/25/97 <br /> Matrix Water Quality Control Sample Blank Spike <br /> Units µg/L <br /> QC LMTS <br /> ARAMETER Method# MB SA SR SP SP SPD SPD RPD (ADVISORY) <br /> µg/f- Ag/L Ng/L µg/L %R µg/L %R RPD 1 %R <br /> 1Benzene 1 8020 1 <0 5 1 25 1 ND 1 268 1 107 1 283 1 113 1 55 25 s 50-150 <br /> I ! 1 I ! I ! I 1 <br /> :Toluene � 8020 1 <05 1 25 � ND � 23 2 1 93 � 242 1 97 11 4 6 � 25 1 50-150 1 <br /> :Ethyl Benzene 8020 <05 1 25 ND 246 98 1 254 1 102 1 34 1 25 1 50-150 1 <br /> Xylenes 1 8020 1 <0 S I 75 ND 1 68 1 91 1 69 92 1 15 1 25 1 50-150 1 <br /> Gasoline i 8015 11 <50 0 625 ND E 601 96 629 101 4 6 i 25 i 50-150 <br /> *DefLmtion 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 /> I <br /> , I <br /> l <br /> r f <br /> rl I <br /> r <br /> I r <br /> ' II I! <br />