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Sequoia 4 H WLane <br /> Walnut Creels CAA 94598 <br /> I) (925)988-9600 <br /> ,! 4 I Analytical FAX equo alabs C 73 <br /> www sequolala65 c <br /> Gettler Ryan,lnL -Dublin Project Tosco <br /> 6747 Sierra Court Suite J Project Number Tosco# 11192 Reported <br /> Dublin CA 94568 Project Manager Doug Lee 10-May-01 10 33 <br /> Volatile Organic Compounds by EPA Method 8260B - 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 lE07003-EPA 5030B (PIT) <br /> Blank(1E07003-BLKI) Prepared&,Analyzed 07-May-01 <br /> Ethanol ND 500 ug/1 <br /> ten-Butyl alcohol ND 20 " <br /> Methyl tert-butyl ether ND 20 <br /> Di-isopropyl ether ND 20 " <br /> Ethyl tert-butyl ether ND 20 " <br /> Cert-Amyl methyl ether ND 20 " <br /> 1 2 Dwhloroethane ND 20 <br /> Ethylene drbromrde ND 20 " <br /> Surrogate Drbrovnofluoromethane 453 500 906 50-150 <br /> Surrogate 1 2 Drchloroethane-d4 403 500 806 50-150 <br /> Blank(IE07003-BLK2) Prepared&Analyzed 08-May-01 <br /> Ethanol ND 500 ug/l <br /> tert Butyl alcohol ND 20 " <br /> Methyl tert-butyl ether ND 20 " <br /> Dr_rs�ropYi ether -- ---— ND----2 - <br /> Ethyl tent-butyl ether ND 20 " <br /> tert-Amvi methyl ether ND 20 <br /> 1 2 Drahloroethane ND 20 " <br /> Ethviene drbromrde ND 20 " <br /> Surrogate Dibrornofluorornethane 447 500 894 50-150 <br /> Surrogate 12-Drchloroethane-d4 384 500 768 50-150 <br /> LCS (1E07003-BSI) — Prepared&Analyzed 07-May-Ol <br /> Methyl tert-butyl ether 436 20 ug/i 500 872 70-130 <br /> Surrogate Dibromofluoromethane 450 500 900 50-150 <br /> Surrogate 12-Dichloroethane-d4 393 500 786 50-150 <br /> Sequoia Analytical - Wahiut Creek The results tri this report apply to the samples analyzed in accordance with the chary <br /> custody document Thr%analytical report must be reproduced in its ert[rrets <br /> Page 7 of 11 <br />