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r <br />Sequoia WalnuttOt Lane <br />Crreek CIA 9 598 <br />4 (925) 988-9600 <br />DAnalytical FAX (925) 988-9673 <br />ttler Ryan, Inc - Dublin Project Chevron <br />6747 Sierra Court Suite J Project Number Chevron 4 9-5775 Reported <br />Dublm CA, 94568 Project Manager Barbara Stenunski 05 -Jan -00 10 22 <br />MTBE Confirmation by EPA Method 8260A - Quality Control <br />Sequoia Analytical - Walnut Creek <br />Reporting Spike Source %REC RPD <br />Analyte Result Limit Units Level Result %REC Limits RPD Limit Notes <br />Batch 9L28013: Prepared 03 -Jan -00 <br />Using EPA 5030B [PIT] <br />Blank (9L28013-BLK2) <br />Methyl tent -butyl ether <br />ND <br />010 mg/kg <br />Surrogate Dtbromofluoromethane <br />300 <br />250 <br />120 <br />50-150 <br />Surrogate 1 2-Drchloroetharre-d4 <br />310 <br />250 <br />124 <br />50-150 <br />LCS (9L28013-BS2) <br />Methyl tert butyl ether <br />269 <br />010 mg/kg <br />250 <br />108 <br />70-130 <br />Surrogate Drbroinofluorornelhane <br />310 <br />2.50 <br />124 <br />50-150 <br />Surrogate 12-Dichloroetharre-d4 <br />280 <br />250 <br />112 <br />50-150 <br />LCS Dup (9L28013-BSD2) <br />Methyl tert butyl ether <br />270 <br />010 mg/kg <br />250 <br />108 <br />70-130 0 371 25 <br />Surrogate Drbrornofluoromelhane <br />300 <br />250 <br />120 <br />50-150 <br />4Vrugate 1 2 Drchlomethane-d4 <br />305 <br />250 <br />122 <br />50-150 <br />Sequoia Analytical - Walnut Creek The results in this report apply to the samples analyzedin accordance with the chain of <br />7;rato <br />custody document Tins analytical report must be reproduced in its entirety <br />aaneMQp,ahector Page 14 of 15 <br />