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a— ) (61551 Ind4nal load"t <br /> Sequoia San Carlos CA 94070 <br /> Analytical FAX <br /> 50)232-9600 <br /> (650)232-9612— <br /> www segt'0ialaba.eom <br /> Gettler-Ryati/Geostrategies(1) Project Tosco(l) <br /> 6747 Sierra Court,Suite J Project Number Tosco#01205 (Circle K),Lathrop Reported <br /> Dublin CA,94568 Project Manager Deanna Harding 05/1 3102 09 26 <br /> Volatile Organic 8 Oxygenated Compounds by EPA Method 8260B - Quality Control <br /> Sequoia Analytical - San Carlos <br /> Reportmg Spike Source %REC RPD <br /> Analyte Result Limit Units Level Result %REC Limits RPD Limit Notes <br /> Batch 2050009-EPA 50308 IP/TJ <br /> Blank(2050009-BLK2) Prepared& Analyzed 05/07/02 <br /> Ethanol ND 500 ug/1 <br /> 1,2-Dibromoethane ND 20 <br /> 1,2-Dichloroethane ND 20 " <br /> Di-isopropyl ether ND 20 <br /> Ethyl tert-butyl ether ND 20 " <br /> Methyl tert-butyl ether ND 20 " <br /> Tett-amyl methyl ether ND 20 " <br /> Tert-butyl alcohol ND 100 " <br /> Surrogate 1,2-Drchloroethane-d4 495 500 990 70-130 <br /> Surrogate Toluene-d8 498 500 996 70-130 <br /> LCS(2050009-BSl) Prepared& Analyzed 05/06/02 <br /> Methyl tert-butyl ether 539 20 ug11 500 108 70-130 <br /> Surrogate 11-Drchloroethane-d4 521 500 104 70-130 <br /> Surrogate Toluene-d8 510 500 101 70-130 <br /> LCS(2050009-BS2) -� Prepared&Analyzed 05/07/02 <br /> Methyl Cert-butyl ether 443 2 0 ug/l Soo 886 70-130 <br /> Surrogate 11-Drchloroethane-d4 506 500 101 70-130 <br /> Surrogate Toluene-l8 501 300 100 70-130 <br /> Matrix Spike(2050009-MSI) -Source L204130-04 Prepared&-Analyzed 05/06/02 <br /> Methyl tert-butyl ether 41 3 2 0 ug/1 500 ND 826 60-140 <br /> Surrogate 1 1-Dichloroethane-d4 438 500 876 70-130 <br /> Surrogate Toluene-d8 479 500 95 8 70-130 <br /> _Matrix Spike Dup(2050009-MSDI) Source L204130d04 Prepared&Analyzed 05/06/02 <br /> Methyl tert-butyl other 422 2 0 ug/l 500 ND 84 4 60-140 2 16 25 <br /> Surrogate 1,2-Dichloroethane-& 43 7 500 874 70-130 <br /> Surrogate Toluene-d8 490 500 980 70-130 <br /> Sequoia Analytical -San Carlos The results in this report apply to the samples analyzed in accordance with the chain <br /> custody document This analytical report must be reproduced in its entirety <br /> Page 13 of 14 <br />