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Road <br /> Sequoia 1551arlosCal4070 <br /> Son Carlos CA 94a7a <br /> (650)232.9600 <br /> Analytical FAX equoi labs.c 12 <br /> wwwsequoialahs.com <br /> Gettler-Ryan/Geostrotegies(1) Project: Tosco(l) <br /> 6747 Sierra Court, Suite.] Project Number: UNOCAL SSW]1195,LATHROP,CA Reported: <br /> Dublin CA,94568 Project Manager: Deanna Harding 08/28/01 07:22 <br /> Volatile Organic 8 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 /> Balch 1080063-EPA 5030EIP/TJ <br /> LCS(1080063-BS1) Prepared&Analyzed:08/15/01 <br /> Methyl tert-butyl ether 45.8 2.0 ug/I 50.0 91.6 70-130 <br /> Surrogate: l,2-Dichloroethane-d4 52.9 50,0 106 76-114 <br /> Surrogate: Toluene-d8 53.1 50.0 106 88-110 <br /> LCS(1080063-BS3) Prepared&Analyzed:08/17/01 <br /> Methyi Leri-butyl ether 51.4 2,0 ug/l 50.0 103 70-130 <br /> Surrogate:l,2-Dichloroethane-d4 49.6 50.0 99.2 76-114 <br /> Surrogate: Toluene-d8 51.2 50.0 102 88-110 <br /> Matrix Spike(1080063-]%IS1) Source: L108076-03 Prepared:08/15/01 Analyzed:08/17/01 <br /> Methyl ten-butyl ether 48.5 2.0 ug/l 50.0 ND 97.0 60-140 <br /> Surrogate:l,2-Dichloroethane-d4 49.7 50.0 99,4 76-114 <br /> Surrogate: Toluene-d8 49.9 50.0 99.8 88-110 <br /> Matrix Spike Dup(1080063-N1SD1) Source: L108076-03 Prepared:08/15/01 Analyzed:08/17/01 <br /> Methyl ten-butyl ether 49.1 2.0 ug/l 50.0 ND 98.2 60-140 1.23 25 <br /> Surrogate:l,2-Dichloroethane-d4 51.2 50.0 102 76-114 <br /> Surrogate:Toluene-d8 49.7 50.0 99.4 88-110 <br /> Balch 1080066-EPA 5030B IP/TJ <br /> Blank(1080066-BLK]) Prepared&Analyzed:08/14/01 <br /> Ethanol ND 1000 ug/l <br /> 1,2-Dibromoethane ND 2.0 <br /> 1,2-Dichloroethane ND 2.0 " <br /> Di-isopropyl ether ND 2.0 " <br /> Ethyl ten-butyl ether ND 2.0 " <br /> Methyl ten-butyl ether ND 2.0 " <br /> Teri-amyl methyl ether ND 2,0 " <br /> Ten-butyl alcohol ND 100 " <br /> Surrogate:l,2-Dichloroethane-d4 49.6 50.0. 99.2 76-114 <br /> Surrogate: Toluene-d8 51.7 50.0 103 88-110 <br /> Sequoia Analytical- San Carlos The results in this report apply to the samples analyzed in accordance with the chain oJ'I `fli <br /> custody document. This analytical report must be reproduced in its entirety. <br /> Page 16 of 22 <br />