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1551 Industnal Road <br /> Sequoia San Carlos CA 94070 <br /> Analytical (650)232 9610 <br /> FAX(650)232 96i1W12 <br /> www soquoialahs wrnm <br /> ler-Ryan/G eostrategies(1) Protect Tosco(l) <br /> 7 Sierra Court,Suite J Project Number Tosco(Unocal)SS#6981, Stockton,CA Reported <br /> Dublin CA,94568 Project Manager Deanna Harding 09/27/01 10 19 <br /> Volatile Organic 8 Oxygenated Compounds by EPA Method 8260B <br /> Sequoia Analytical - San Carlos <br /> Reporting <br /> Analyte Result Limit Units Dilution Batch Prepared Analyzed Method Notes <br /> VW-7(L109080-17)Water Sampled 09/12/01 1610 Received 09113/011930 R-05 <br /> Ethanol ND 25000 ugll 25 1090068 09/19/01 09/19/01 EPA 8260B <br /> 1,2-Dibromoethane ND 50 " <br /> 1,2-Dtchloroethane ND 50 ^ <br /> Di-isopropyl ether ND 50 <br /> Ethyl Cert-butyl ether ND 50 " <br /> Methyl tent-butyl ether ND 50 " <br /> Tert-amyl methyl ether ND 50 " <br /> Tert-butyl alcohol ND 2500 " <br /> Surrogate 1,2-Dichloroethane-d4 904% 76-114 " <br /> Surrogate Toluene-d8 102% 88-110 " <br /> PTW-1 (1-109080-18)Water Sampled 09/13/01 15 10 Received 09/13/01 19 30 <br /> Ethanol ND 1000 ugA 1 1090076 09/20/01 09/20/01 EPA 8260B <br /> 1,2-Dibromoethane ND 20 " <br /> 1,2-Dtchloroethane 57 20 ^ <br /> fpropyl ether ND 20 " <br /> cert-butyl ether ND 20 <br /> Methyl tert-butyl ether 20 20 " <br /> Tert-amyl methyl ether ND 20 <br /> Tert-butyl alcohol ND 100 " <br /> Surrogate 1,2-Dtchloroethane-d4 101 % 76-114 " <br /> Surrogate Toluene-d8 958% 88-110 " <br /> i <br /> la Analytical- San Carlos The results to this report apply to the samples analyzed to accordance with the chain of <br /> custody document Thrs analytical report must be reproduced in its entirety <br /> Page 13 of 21 <br />