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404 N Wiget Lane <br /> Sequoia Walnut Creek CA 94598 <br /> 4 (925)988-9600 <br /> (D <br /> �11� Analytical FAX(925)988-9673 <br /> Ank <br /> er Ryan,Inc -Dublin Project Tosco <br /> 6747 Sierra Court Suite J Project Number Tosco#6981 Reported <br /> Dublin CA,94568 Project Manager Mike Mitchener 08-Sep-99 14 55 <br /> Volatile Organic Compounds by EPA Method 8260A <br /> Sequoia Analytical -Walnut Creek <br /> Reporting <br /> Analyte Result Limit Units Dilution Batch Prepared Analyzed Method Notes <br /> MW-14(W908479-02)Water Sampled 21-Aug-99 12 55 Received 24-Aug-99 16 20 0-04 <br /> Ethanol ND 500 ug/l 1 9I07010 06-Sep 99 06-Sep-99 EPA 8260A <br /> tent-Butyl alcohol ND 100 " <br /> Methyl tent-butyl ether 110 20 " <br /> Dt-isopropyl ether ND 20 <br /> Ethyl tert-butyl ether ND 20 <br /> tort-Amyl methyl ether ND 20 " <br /> Surrogate Dibromofluoromethane 102 % 50-150 " <br /> Surrogate 1 2-Diehloroethane-d4 102 % 50-150 <br /> MW-15(W908479-03)Water Sampled 21-Aug-99 12 10 Received 24-Aug-99 16 20 0-04 <br /> Ethanol ND 500 ug/l 1 9I07010 06-Sep-99 06-Sep-99 EPA 8260A <br /> tert-Butyl alcohol ND 100 " <br /> Methyl tent-butyl ether 20 20 " <br /> Di-isopropyl ether ND 20 <br /> Et 1 tart-butyl ether ND 2 0 " <br /> yl methyl ether ND 2 0 " " <br /> Sunagate Drbromofluoronrethane 102 °10 50-ISO <br /> Surrogate 1,2-Dichloroethane-d4 100% 50-150 " <br /> MW-16(W908479-04)Water Sampled 21-Aug-99 14 50 Received 24-Aug-99 16 20 0-04 <br /> Ethanol ND 500 ug/1 1 9I07010 06-Sep-99 07-Sep-99 EPA 8260A <br /> tert-Butyl alcohol ND 100 " <br /> Methyl tert-butyl ether 69 20 " <br /> Di-isopropyl ether ND 20 <br /> Ethyl tert-butyl ether ND 20 " <br /> tent-Amyl methvl ether ND 20 " <br /> Surrogate Dibromofluoromethane 940% 50-150 " <br /> Surrogate 1 2-Dichloroethane-d4 880% 50-150 <br /> Sequoia Analytical-Walnut Creek The results in tins report apply to the se rnples analyzed rn accordance with the chain of <br /> custody document This analytical report must be reproduced in its entirety <br /> UC <br /> e e*e <br /> ey, <br /> A <br /> c a ger Page 4 of 8 <br /> i <br />