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404 N Wiget Lane <br /> Sequoia Walnut aed;CA 94598 <br /> (925)988-9600 <br /> Analytical FAX(916)988-9673 <br /> www se uolalabs can <br /> er Ryan,Inc -Dublin Project Unocal <br /> Sierra Court Suite J Project Number Unocal#2859 Reported* <br /> Dublin CA,94568 Project Manager Deanna L Harding 07-Dec-01 08 14 <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 I K27026-EPA 5030B(PIT) - <br /> Blank(IK27026-BLKI) Prepared&Analyzed 27-Nov-01 <br /> Ethanol ND 500 ug/l <br /> tert-Butyl alcohol ND 20 " <br /> Methyl tert-butyl ether(MTBE) ND 20 " <br /> Di-isopropyl ether ND 20 " <br /> Ethyl ten-butyl ether ND 20 " <br /> i <br /> tert-Amyl methyl ether ND 20 " <br /> 1,2-Diehloroethane ND 20 " <br /> Ethylene dibromide ND 20 <br /> Surrogate Dibromofluoromethane 496 500 99 50-150 <br /> Surrogate 1,1-Dichloroethane-d4 639 500 118 50.150 <br /> LCS(I K27026-BSI) Prepared&Analyzed 27-Nov-01 <br /> Methyl tert-butyl ether(MTBE) 382 20 ug/1 500 76 70-130 <br /> ate Dibromofluoromethane 483 500 97 50-150 <br /> Su gale 1,1-Dichloroethaned4 544 Soo 109 50-150 <br /> Matrix Spike(1K27026-MSI) Source W111332-12 Prepared&Analyzed 27-Nov-01 <br /> Methyl tert-butyl ether(MTBE) 481 20 ug/l Soo ND 96 60-150 <br /> Surrogate Dibromofluoromethane 508 500 101 50-150 <br /> Surrogate 11-Dichloroethaned4 692 500 138 50-150 <br /> Matrix Spike Dup(IK27026-MSD1) Source W111332-12 Prepared&Analyzed 27-Nov-01 <br /> Methyl tert-butyl ether(MTBE) 529 20 ug/1 500 ND 106 60-150 10 25 <br /> Surrogate Dibromofluoromethane 519 500 106 50-150 <br /> Surrogate 1,2-Dichloroethane-d4 695 500 139 50-150 <br /> is Analytical-Walnut Creek The results in this report apply to the samples analyzed in accordance with the chain of <br /> custody document This analytical report must be reproduced to its entirety <br /> 18 of 19 <br />