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i 404 Sequoia Walnut Creek" W+ lane CAA 94598 (925)988-9600 qQF Analytical FAX 988-9673 FAX serequoquotalabs corn Gettler Ryan, Inc -Dublin Project Chevron _6747 Sierra Court_Surte J Protect Number Chevron#9-6171 Reported Dublin CA,94568 Project Manager Deanna L Harding 3l-Jul-01 07 59 MTBE Confirmation by EPA Method 8260B - Quality Control Sequoia Analytical- Walnut Creek Reporting Spike Source %REC RPD Analyte Result Limit Units Level Result %REC Limits RPD Limit Notes Batch 1G26012- EPA 5030B(PIT) Blank(1G26012-BLK1) Prepared&Analyzed 26-Jul-01 Methyl tert-butyl ether ND 20 ug/l Surrogate Drbromofluoromethane - - 570-- - -- - 50 0-- - -----114--50-150— Surrogate -----114--50-150—Surrogate 1 2-Dichloroethane-d4 550 500 110 50-150 Blank(1G26012-BLK2) Prepared&Analyzed 27-Jul-01 Methyl tert-butyl ether ND 20 ug/1 Surrogate Dibromofluoromethane 470 500 940 50-150 Surrogate 1 2-Dichloroethane-d4 490 500 980 50-150 Blank(1G26012-BLK3) Prepared&Analyzed 28-Jul-01 Methyl tert-butyl ether ND 20 ug/l Surrogate Dthromofluoromethane 465 500 930 30-150 Surrogate 1 2-Dichloroethane-d4 504 500 101 50-150 LCS(1G26012-BSI) Prepared&Analyzed 26-Jul-01 Methyl tert-butyl ether 467 20 ug/1 500 934 70-130 Surrogate Dibromofluoromethane 490 500 980 50-150 Surrogate 1 2-Dichloroelhane-d4 -520 500 104 50-150 LCS(IG26012-_BS2)_ _ Prepared&A_nalyze_d 27-Jul-O_I _ Methyl Cert-butyl ether 493 20 ug/I Soo 986 70-130 Surrogate Dibromofluoromethane 510 500 102 50-I50 Surrogate 1,2-Drchloroethane-l4 490 500 980 50-150 LCS(IG26012-BS3) Prepared&Analyzed 28-Jul-01 Methyl tert-butyl ether 426 20 ug/1 500 852 70-130 Surrogate Dibromofluoromethane 479 500 958 50-150 Surrogate 1,2-Dichloroethane-d4 492 500 984 50-150 Sequoia Analytical- Walnut Creek The results in this report apply to the samples analyred in accordance with the c custody document This analytical report must be reproduced in its en Page 13 of 18