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a— ) (71455 McDowell Blvd,North Ste 1) <br /> Sequoia I i Petaluma,CA 94954 <br /> Analytical FAX <br /> 07)792-1865 <br /> (707)792-0342 <br /> www sequoialabs com <br /> Gettler-Ryan/Geostrateg.ies(1) Project Unocal(4) <br /> 6747 Sierra Court,Suite] Project Number Former Unocal#0187,Stockton Reported <br /> Dublin CA,94568 Project Manager Deanna Harding 05/24/02 16 38 <br /> i <br /> Volatile Organic Oxygenated Compounds by EPA Method 8260B - Quality Control <br /> Sequoia Analytical - San Carlos <br /> Reporting - Spike Source %REC RPD <br /> Analyte Result Limit Units Level Result %REC Limits RPD Limit Notes <br /> Batch 2050034-EPA 5030B I PIT <br /> Blank(2050034-BLKI) �- Prepared&Analyzed 05/15/02 <br /> Ethanol ND 500 ug/l <br /> Tert-butyl alcohol ND 20 " <br /> Methyl tert-butyl ether ND 10 " <br /> Di-isopropyl ether ND 1 0 " <br /> Ethyl tent-butyl ether ND 10 " <br /> Teri-amyl methyl ether ND 1 0 " <br /> Surrogate 1,2-Dichloroethane-d4 500 500 100 70-130 <br /> Blank(2050034-BLK2) Prepared&Analyzed 05/16/02 <br /> Ethanol ND 500 ug/l <br /> Tert-butyl alcohol ND 20 " <br /> Methyl tent-butyl ether ND 1 0 <br /> Di-isopropyl ether ND 10 " •r <br /> Ethyl tert-butyl ether ND 1 0 " <br /> Teri-amyl methyl ewer ND I U <br /> Surrogate-1 2-Dichloroethane-d4 49 8 500 99 670-130 - ---- <br /> t <br /> CCS{2050034-BSI)— ---- ------ — Prepared&Analyzed 05/15/02 <br /> Methyl tent-butyl ether 481 1 0 ug/l 500 96 2 --70-130 <br /> Surrogate 12-Dichloroethane-d4 487 500 974 70-130 <br /> LCS(2050034-BS2) Prepared&Analyzed 05/16/02 <br /> Methyl tert-butyl ether 491 10 ug/l Soo 982 70-130 <br /> Surrogate 1,2-Dichloroethane-d4 481 500 962 70-130 <br /> Matrix Spike(2050034-MSI) Source L205039-29 Prepared&Analyzed 05/15/02 <br /> Methyl teri-butyl ether 399 10 ug/l 500 ND 79 8 60-140 <br /> Surrogate 1 2-Dichloroethane-d4 460 500 920 70-130 <br /> Sequoia Analytical -San Carlos The results in this report apply to the samples analyzed in accordance with the chain 0 <br /> custody document This analytical report must be reproduced in its entirety <br /> Page 28 of 30 <br />