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404 N Wiget Lane <br /> Walnut Creek CA 94598 <br /> Sequoia (925)988-9600 <br /> FAX(925)988-9673 <br /> Analytical www seq,ofalabs WM <br /> Gerlier 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 14-Mar-01 10 19 <br /> Volatile Organic Compounds by EPA Method 8260B <br /> Sequoia Analytical - Walnut Creek <br /> Reporting <br /> Analyte Result Luna Units Dilution Batch Prepared Analyzed Method Notes <br /> U4(W102669-05)Water Sampled 26-Feb-01 12 00 Received 28-Feb-01 16 50 <br /> tert-Butyl alcohol ND 50 ug/l 1 1C05013 06-Mar-01 06-Mar-01 EPA 8260B <br /> Methyl Cert-butyl ether ND 20 <br /> Di-isopropyl ether ND 20 <br /> Ethyl tert-butyl ether ND 20 <br /> tert-Amyl methyl ether ND 20 <br /> Surrogate Dibromofluaromethane 102% 50-150 " <br /> Surrogate 1,2 Dtchloroethaneil4 848% 50-150 " <br /> U-5(W 102669-06)Water Sampled 26-Feb-01 11 25 Received 28-Feb-01 16 50 <br /> tert-Butyl alcohol ND 50 ug/1 1 1C05013 06-Mar-01 06-Mar-01 EPA 82608 <br /> Methyl tent-butyl ether ND 20 <br /> Di-isopropyl ether ND 20 <br /> Ethyl text-butyl ether ND 20 " <br /> tertAmyl methyl ether ND 20 <br /> S ate Dibromofluoromethane 104% 50-150 " <br /> ate 1,2-Dtchloroethane-d4 848% 50-150 " <br /> U-0(W102669407)Water Sampled 26-Feb-01 1132 Received 28-Feb-01 16 50 <br /> tert-Butyl alcohol ND 50 ug/1 1 1005013 06-Mar-01 06-Mar-01 EPA 8260E <br /> Methyl tent butyl ether ND 20 " <br /> Di-isopropyl ether ND 20 <br /> Ethyl tert-butyl ether ND 20 <br /> tert-Amyl methyl ether ND 20 <br /> Surrogate Dibronrofluoromethane 102% 50-150 " <br /> Surrogate 1,2-D:ehloroethane-l4 856% 50-150 " <br /> ,Soia Analytical-Walnut Creek The results in tins report apply to the samples analyzed in accordance with the chain of <br /> custody document TMs analytical report must be reproduced to its entirety <br /> Page 4 of 32 <br />