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Sequoia Walnut <br /> N Lane <br /> t Geek,,CA CA 94598 <br /> (925)9W%M <br /> Analytical FAX(925)988-9673 <br /> �,, r <br /> er Ryan,Inc -Dublin Project Tosco <br /> 6747 Sierra Court Suite 7 Project Number Tosco(Unocal)#6981 Reported <br /> Dublin CA,94568 Project Manager Deanna L Harding 23-Nov-99 16 42 <br /> Volatile Organic Compounds by EPA Method 8260A- Quality Control <br /> Sequoia Analytical -Walnut Creek <br /> Reporting Spike Source %REC RPD <br /> Analyte Result Linut Units Level Result %REC Limits RPD Linut Notes <br /> Batch 9KO8019: Prepared 04-Nov-99 Usmg EPA 5030B [Pffl <br /> Matrix Spike(9K08019-MS1) Source W910568-02 <br /> Methyl ten-butyl ether 369 20 ug/1 500 38 106 60-150 <br /> Surrogate Dibroinofluoroineihane 530 500 106 50-150 <br /> Surrogate 12-Dichloroethane-N 540 500 108 50-150 <br /> Matrix Spike Dup(9K08019-MSD1) Source W910569-02 <br /> Methyl tert-butyl ether 557 20 ug/l 500 38 104 60-150 2 l3 25 <br /> Surrogate Dibroinofluoromethane 530 " .500 106 50-150 <br /> ,Surrogate 12-Dichloroeihane d4 530 500 106 50.150 <br /> I. <br /> I <br /> 0oia Analytical- Walnut Creek The re vults in this report apply to the sample s analyzed i n accordmrce with the chain of <br /> custody document This analytical report must be reproduced to its entirety <br /> 4ue eg ey, ralect Mit ger Page 18 of 19 <br />