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Gettler-Ryan/Geostiategies(l) Project Tosco(!) <br /> 6747 Sicrra Court,Suite 3 Project Number TOSCO#5886/STOCKTON,CA Reported <br /> Dublin CA,94568 Project Manager Deanna Harding 05/15/01 12 14 <br /> MTBE by EPA Method 8260B-Quality Control <br /> Sequoia Analytical- San Carlos <br /> Repomng Spice Source %REC RPD <br /> Analyte Result Lumt //tilts Level Resat %REC Lmits RPD L=t Not, <br /> Batch 1050041- EPA 5030B P <br /> Biank(1050041-BLK1) Prepared&Analyzed 05/11/01 <br /> Methyl tert-butyl ether ND 200 ugll <br /> Surrogate 12-Dichloroethane-d4 457 500 914 76-114 <br /> LCS(1050041-BSI) Prepared&Analyzed 05/11/01 <br /> Methyl tert-butyl ether 487 200 ug/E 500 974 70-130 <br /> Surrogate 1 1-Dichloroethane-d4 490 500 980 76-114 <br /> Matrix S ike(1050041-MS1) Source L105054-02 Prepared&Analyzed 05/11/01 <br /> Methyl tert-butyl ether 508 200 ug/1 Soo 826 851 60-140 <br /> Surrogate 12-Dichloroethane-d4 471 11 500 941 76-114 <br /> ivo Spike Du (1050041-MSD1) Source L105054-02 Prepared&Analyzed 05/11/01 <br /> Methyl tert butyl ether 522 200 ug/1 500 826 879 60-140 272 25 <br /> Surrogate 11-Dichloroethane-d4 481 500 961 76-114 <br /> Batch 1050043-EPA 5030B PIT <br /> Blank(1050043-BLKI) Prepared 05/11/01 Analyzed 05/13/01 <br /> Methyl tert-butyl ether ND 200 ug/l <br /> Surrogate 11-D:chloroethane-d4 499 500 998 76-114 <br /> LCS(1050043-BSI) Prepared 05/11/01 Analyzed 05/13/01 <br /> Methyl tent-butyl ether 533 200 ug/l 500 107 70-130 <br /> Surrogate 1 1-Dichloroethane-d4 508 500 102 76-114 <br /> Matrix Spike(1050043-MS1) Source L105073-01 Prepared&Analyzed 05/11/01 <br /> Methyl tert-butyl etber 568 200 ug/1 Soo 125 886 60-140 <br /> Surrogate 1 1-Dichloroethane-d4 453 500 906 76-114 <br /> equoia Analytical-San Carlos The results in this report apply to the samples analyaed in accordance with the chain of <br /> custody document This analytical report must be reproduced in its entirety <br /> Page 4 of 6 <br />