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i <br /> Gettler-Ryan/Geostrategtes(1) Project Tosco(1) <br /> 6747 Sierra Court,Suite J Project Number Tosco#5886,Stockton,CA Repo <br /> rted <br /> Dublin CA,94568 Project Manager Deanna Harding 05/25/01 16 59 <br /> Volatile Organic 8 Oxygenated Compounds by EPA Method 8260B -Quality Control <br /> Sequoia Analytical- San Carlos <br /> Reporting Spike Source %REC RPD <br /> Analyte Result Limit Units Lavel Result %REC Lmnts RPD limn Notes <br /> Batch 1050041-EPA 5030B PIT <br /> LCS(1050041-BS2) Ptepared&Analyzed 05/15/01 <br /> Methyl tert-butyl elder 503 200 ugtl Soo 101 70-130 <br /> Surrogate 1,2-Dichloroethane-d4 519 500 104 76-114 <br /> Surrogate Toluene-d8 539 500 108 88-110 <br /> Matrix Spike(1050041-M51) Source L105054-02 Prepared&Analyzed 05/11/01 <br /> Methyl tert-butyl ether 508 200 ug/l 500 826 85 1 60-140 <br /> Surrogate 1 2-Dichloroethane-d4 471 500 942 76-114 <br /> Surrogate Toluene-d8 494 500 988 88-110 <br /> Matrix Spike Du (1050041-MSDI) Source L105054-02 Prepared&Analyzed 05/11/01 <br /> Methyl tert-butyl ether 522 200 Usti Soo 826 879 60-140 272 25 <br /> Amll� gate I1-Dichloroedme-d4 481 500 962 76-114 <br /> Surrogate Toluene-d8 480 500 960 88-110 <br /> Batch 1050043-EPA 5030B PIT <br /> Blank(1050043-BLKI) - --- Prepared 05/11/01 Analyzed 05/13/01 <br /> Ethanol ND 1000 u8/1 <br /> 1,2-Dibromoethane ND 200 " <br /> 1,2-Dichloroethane ND 200 " <br /> Di-isopropyl ether ND 200 " <br /> Ethyl tert-butyl ether HD 200 " <br /> Methyl tart-butyl ether ND 200 " <br /> Tert-amyl methyl ether ND 200 " <br /> Tert-butyl alcohol ND 100 " <br /> Surrogate 1 1-Dichloroethane-d4 424 500 848 76-114 <br /> Surrogate Toluene-d8 SO 6 500 101 88-110 <br /> Imequoia Analytical-San Carlos The results in this report apply to the samples analped in accordance with the chain of <br /> custody document This analytical report must be reproduced in its entirety <br /> Page 24 of 28 <br />