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404 N Wiget lane <br /> �� . Sequoia Walnut Creek, 98 94598 <br /> -9600 <br /> (925)988-9600 <br /> ' �„� Analytical FAX(925)alabs c 73 <br /> www segttolalabs cam <br /> ttler Ryan,Inc -Dublin Project Unocal <br /> 6747 Sierra Court Suite J Project Number Unocal#0187 Reported <br /> Dublin CA,94568 Project Manager Deanna L Harding 22-Jun,-00 07 41 <br /> Volatile Organic Compounds 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 OF11006-EPA 5030B [PIT] <br /> Blank(OF11006-BLKI) Prepared&Analyzed 1 I-Jun-00 <br /> tert-Butyl alcohol ND 100 ug/1 <br /> Methyl tent-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 /> Surrogate Dibromolluoromethare Soo Soo 104 50-ISO <br /> Surrogate 1 2-Drchloroethane-d4 450 500 900 50-150 <br /> LCS(OF11006-BSI) Prepared&Analyzed l I-Jun-00 <br /> Methyl tert-butyl ether 478 20 ug/1 500 956 70-130 <br /> Surrogate Drbromofluoromethane Soo 500 100 50-150 <br /> r.o$ agate 1 2-Drchloroeihorre-d4 430 Soo 860 50.150 <br /> x Spike(OF11006-MSI) Source W006224-04 Prepared&Analyzed 1 I-Jun-00 <br /> Methyl tert butyl ether 560 20 ugll 500 ND 112 60-150 <br /> Surrogate Drbrornofluoromethone 490 500 980 50.150 <br /> Surrogate 12-Drchloroethone-d4 410 Soo 820 50-150 <br /> Matrix Spike Dup (0F11006-MSDI) Source W006224-04 Prepared&Analyzed I1-Jun-00 <br /> Methyl tent-butyl ether 560 20 ug/1 500 ND 112 60.150 0 25 <br /> Surrogate Dibromofluoromethane 490 500 980 50-150 <br /> Surrogate 1 2-Drchloroethane-d4 420 Soo 840 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 in els entirety <br /> Page 11 of 12 <br />