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1551 Industrial Road <br /> ( Sequoia'� San Carlos CA 94070 <br /> `��'� Analytical FAX(650)232-9600 <br /> 12 <br /> wrv.sequoialabs.com <br /> Gettler-Ryan/Geostrategies(1) Project: Tosco(1) orf, <br /> 6747 Sierra Court, Suite J Project Number: Tosco#11195,Lathrop,CA Reported: = : <br /> Dublin CA,94568 Project Manager: Deanna Harding 12/10/01 19:11 <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 /> Batch 1110089-EPA 5030B fP/TJ <br /> LCS(1110089-BS2) Prepared&Analyzed: 11/28/01 <br /> Methyl tert-butyl ether 56.1 1.0 ug/l 54.0 112 70-130 <br /> Surrogate:1,2-Dichloroethane-d4 26.5 25.0 106 70-130 <br /> Surrogate: Toluene-d8 24.7 25.0 98.8 70-130 <br /> Matrix Spike(1110089-MSI) Source:L111140-15 Prepared&Analyzed: 11/26/01 <br /> Methyl tert-butyl ether 46.8 1.0 ug/l 50.0 ND 93.6 60-140 <br /> Surrogate:1,2-Dichloroelhane-d4 48.0 50.0 96.0 70-130 <br /> Surrogate:Toluene-d8 51.3 50.0 103 70-130 <br /> Matrix Spike Dup(1110089-MSDI) Source:Ll11140-15 Prepared&Analyzed: 11/26/01 <br /> Methyl tert-butyl ether 48.7 1.0 ug/l 50.0 ND 97.4 60-140 3.98 25 <br /> Surrogate:1,2-Dichloroethane-d4 50.8 50.0 102 70-130 <br /> Surrogate:Toluene48 50.5 50.0 101 70-130 <br /> Batch 1110100-EPA 5030B IP/Tl = <br /> Blank(I1]0100-BLKI) Prepared&Analyzed: 11/28/01 <br /> Ethanol ND 500 ug/1 <br /> 1,2-Dibromoethane ND 1.0 " <br /> 1,2-Dichloroethane ND 1,0 " <br /> Di-isopropyl ether ND 1.0 " <br /> Ethyl tert-butyl ether ND 1.0 " <br /> Methyl tert-butyl ether ND 1.0 " <br /> Tert-amyl methyl ether ND 1.0 <br /> Tert-butyl alcohol ND 20 <br /> Surrogate.1,2-Dichloroelhane-d4 15.5 25,0 102 70-130 <br /> Surrogate: Toluene-d8 25.1 25.0 100 70-130 <br /> Sequoia Analytical-San Carlos The results in this report apply to the samples analyzed in accordance with the chain c` <br /> custody document. This analytical report must be reproduced in its entirety. <br /> Page 14 of 18 <br />