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• <br /> Gettler-Ryan/Geostrategies(1) Project Tosco(1) <br /> 6747 Sierra Court,Suite J Prosect Number TOSCO#58861 STOCKTON,CA Reported <br /> Dublin CA,94568 Project Manager Deanna Larding 05/15/01 12 14 <br /> MTBE by EPA Method 8260B- Quality Control <br /> Sequoia Analytical - San Carlos <br /> Reporting Spike Source %REC RPD <br /> Analyte Result Limit Units Level Result %REC limits RPD Lrmu Notes <br /> Batch 1050041 -EPA 5030B [PIT] <br /> Blank(1050041-BLKI) Prepared&Analyzed 05/11/01 <br /> Methyl tort-butyl ether ND 200 ug/I <br /> Surrogate 12-Dichloroethane-d4 457 500 914 76-114 <br /> LCS.(1050041-BSI) Prepared&Analyzed 05/11/0I <br /> Methyl tent-butyl ether 487 200 ug/1 Soo 974 70-130 <br /> Surrogate 12-Dtchloroethane-d4 490 Soo 980 76-114 <br /> Matm Spike(1050041-MSI) Source L105054-02 Prepared&Analyzed 05/l 1101 <br /> Methyl tent-butyl ether 508 200 ug/1 500 826 85 1 60-140 <br /> �1x <br /> S gate 11-Dtchloroethane-d4 471 500 941 76-114 <br /> Spike Dup(1050041-MSD1) Source L105054-02 Prepared&Analyzed 05/11/01 <br /> Methyl tert-butyl ether 522 200 ug/I 500 826 879 60-140 272 25 <br /> Surrogate 11-Drchloroethane-d4 481 500 962 76-114 <br /> Batch 1050043-EPA 5030B IP/TJ <br /> Blank(1050043-BLKI) Prepared 05/11/01 Analyzed 05/13/01 <br /> Methyl cert-butyl ether ND 200 119/1 <br /> Surrogate 1,1-,Dtchloroethane-d4 499 500 998 76-114 <br /> LCS(1050043-BSI) Prepared 05111/01 Analyzed 05/13/01 <br /> Methyl tert-butyl ether 533 200 ug/l Soo 107 70-130 <br /> Surrogate 1,2-Dtchloroethane d4 508 Soo 101 76-114 <br /> Matrix Spike(1050043-MSI) Source L105073-01 Prepared&Analyzed 05/11/01 <br /> Methyl tert-butyl ether 568 200 ug/l Soo 125 886 60-140 <br /> Surrogate 12-Dichloroethane-d4 453 300 906 76-114 <br /> Sequoia Analytical- San Carlos The results in this report apply to the samples analyzed in accordance with the chain of <br /> custody document This analytical report must be reproduced in its entirety <br /> Page 4 of 6 <br />