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1`} 1551 Industrial(toad <br /> Sequoia San Carlos CA 94070 <br /> ID (650)232-%W <br /> IW Analytical FAX(650)232-9612 <br /> www sequoislabs com <br /> er-Ryan/Geostrategles(1} Project Tosco(1) <br /> Sterna Court,Suite J P%)ect Number Tosco#01205(Circle K),Lathrop Reported <br /> Dublin CA,94568 Project Manager Deanna Harding 05/13102 09 26 <br /> Volatile Organic 8 Oxygenated Compounds by EPA Method 8260B <br /> Sequoia Analytical - San Carlos <br /> Reporting <br /> Analyte Result Limit Units Dilution Batch Prepared Analyzed Method Notes <br /> MW-1 (1,,204130-02)Water Sampled_ 04/29_/02 13 10 Received 04/29/02 17 20 R-05 <br /> Ethanol ^ ND 2500 ug/I 5 2050005 05/06/02 - 05/06/02 EPA 8260B <br /> 1,2-Dibromoethane ND 10 <br /> 1,2-Dichloroethane ND 10 ~ " <br /> Di-isopropyl ether ND 10 <br /> Ethyl tert-butyl ether ND 10 <br /> Methyl tert-butyl ether ND 10 " <br /> Tert-amyl methyl ether ND 10 ~ " <br /> Tert-butyl alcohol ND 500 <br /> Surrogate 1,2-Dichloroethane-d4 906% 70-130 <br /> Surrogate Toluene-d8 101 % 70-130 " ~ <br /> MW-2 L204130-03 Water Sampled 04/29/02 11.55 Received 04/29/02 17 20 <br /> Ethanol ND 500 ug/I 1 2050005 05/06/02 05/06/02 EPA 8260B <br /> 1,2-Dibromoethane ND 2 0 <br /> 1,2-Dichloroethane ND 20 " ~ <br /> Di- ropyl ether ND 20 <br /> Ebutyl ether ND 20 <br /> Me yl tert-bury[ether 62 20 ^ <br /> Tert-amyl methyl ether ND 2 0 <br /> Ter(-butyl alcohol _ 110 _ 100 <br /> Surrogate 1,2-Dichloroethane-d4 904 % 70-130 <br /> Surrogate Toluene-d8 950 % 70-130 <br /> MW-3(L204130-04)Water Sampled 04/29/02 12 35 Received-04/29/02 17 20 <br /> Ethanol ND 500 ug/1 I 2050009 05/06/02 05/06/02 EPA 8260B <br /> 1,2-Dibromoethane ND 20 <br /> 1,2-Dichloroethane ND 20 <br /> Di-isopropyl ether ND 2 0 <br /> Ethyl tert-butyl ether ND 20 <br /> Methyl tert-butyl ether ND 20 <br /> Tert-amyl tnethyl ether ND 2 0 <br /> Tert-butyl alcohol ND 100 <br /> Surrogate 1,2-Dichloroethane-d4 894 % 70-130 <br /> Surrogate Toluene-d8 950% 70-130 <br /> 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 6 of 14 <br />