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• <br /> Gettler-Ryan/Geostrategies(1) Project Unocal(4) <br /> 6747 Sierra Court,Suite J Project Number Former Unocal SS#0187 Reported <br /> Dublin CA,94568 Project Manager Deanna Harding OS/30/Ol 13 32 <br /> Volatile Organic Oxygenated Compounds by EPA Method 8260E - Quality Control <br /> Sequoia Analytical-San Carlos <br /> Reporting Spike Source %REC RPD <br /> Analyte Result Limit amts Level Result %REC Limits RPD Limit Notes <br /> Batch 1050081-EPA 50308 PIT <br /> LCS(1050081-BS2) Prepared&Analyzed 05/19ro1 <br /> Methyl tert-butyl ether 440 200 ug/1 500 880 70-130 <br /> Surrogate 1,2-Dtchloroethane-d4 401 Soo 801 76-114 <br /> Matrix Spike(1050081-MS1) Source L105144-04 Prepared&Analyzed 05/18/01 <br /> Methyl tert-butyl ether 430 200 ugA Soo ND 860 60-140 <br /> Surrogate 1 2-Dtchloroethane-d4 444 " Soo 888 76-114 <br /> Matrix Spike Dup(1050081-MSD1) Source L105144-04 Prepared&Analyzed 05/18/01 <br /> Methyl telt-butyl ether 450 200 u9/1 500 ND goo 60-140 455 25 <br /> Surrogate 12-Dtchloroethane-d4 412 500 844 76-114 <br /> h 1050084-EPA 50308 PIT <br /> Blank(1050084-BLK1) Prepared&Analyzed 05/19/01 <br /> Ethanol ND 1000 ugll <br /> Tert-butyl alcohol ND 100 " <br /> Methyl tert-butyl ether ND 200 " <br /> Di-isopropyl ether ND 200 " <br /> Ethyl tent-butyl ether ND 200 " <br /> Tert-amyl methyl ether ND 200 " <br /> Surrogate 1 1-Dichloroethaned4 428 500 856 76-114 <br /> LCS(1050084-BSI) Prepared&Analyzed 05/19/01 <br /> Methyl tert-butyl ether 440 200 ug/1 500 880 70-130 <br /> Surrogate 1,2-Dtchloroethane-d4 401 500 801 76-114 <br /> Matrix$ ike(1050084-MS1) Source L105155-04 Prepared&Analyzed 05/19/01 <br /> Methyl tett-butyl ether 788 200 ugfl 500 354 868 60-140 <br /> Surrogate 12-Dichloroethaned4 415 500 830 76-114 <br /> quota Analytical-San Carlos The results in this report apply to the samples analysed in accordance with the chain of <br /> custody document Thu analytical report must be reproduced in its entirety <br /> Page 30 of 33 <br />