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Sequoia <br />� Analytical <br />Gettler Ryan, Inc - Dublin Project Chevron <br />6747 Sierra Court Suite J Project Number Chevron # 9-5775 <br />Dublin CA, 94568 Project Manager Barbara Sieminski <br />MTBE Confirmation by EPA Method 8260A - Quality Control <br />Sequoia Analytical - Walnut Creek <br />404 N Wtget Lane <br />Walnut Creek CA 94598 <br />(925) 988-960(;' <br />FAX (925) 988-9673 <br />Reported <br />06 -Jan -00 17 03 <br />Reporting Spike Source %REC RPD <br />knalyte Result Limit Units Level Result %REC Limits RPD Limit Notes <br />Batch 9L28013 Prepared 03-Jan4O <br />Using EPA 5030B [PIT] <br />Blank (9L28013-BLK2) <br />Methyl tert-butyl ether <br />ND 0 10 mg/kg <br />Surrogate Dibromofluoromethone <br />300 <br />250 <br />120 <br />50-150 <br />Surrogate 12-Dichloroethane-d4 <br />310 <br />250 <br />114 <br />50-150 <br />LCS (9L28013-BS2) <br />Methyl tert-butyl ether <br />269 0 10 mg/kg <br />250 <br />108 <br />70-130 <br />Surrogate Drbromofluoromethrnre <br />310 <br />250 <br />124 <br />50-150 <br />Surrogate 12-Dtchloroethane-d4 <br />280 <br />250 <br />112 <br />50-150 <br />LCS Dup (9L28013-BSD2) <br />Methyl text -butyl ether 270 010 mg/kg 250 108 70-130 0 371 25 <br />Surrogate Drbrornofluoronrethane <br />Surrogate 1 2 Drchloroetharre-d4 <br />300 250 120 50-150 <br />305 250 122 50-150 <br />Sequoia Analytical - Walnut Creek The results in tins report apply to the samples analyzed ina:!cordLnrce with the chun of <br />C'C�� custody document This analytical repott must be reproduced m t is et8rre� <br />eratoryDirector Page 3 of 4 <br />-7 <br />O- <br />W"-.% <br />