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1551 labstnal Road <br /> San Cuba CA 94070 <br /> Sequoia (650)232-9600 <br /> 4D . FAX(650)232-9612 <br /> �� Analytical www-wPotislahs COM <br /> Gettler-Ryan/Geostrategies(l) Project Tosco(1) <br /> 6747 Sierra Court,Suite j Project Number Former Unocal SS#4409,Stockton,CA Reported <br /> Dublin CA,94568 Project Manager Deanna Harding 10/26/0109;3:91 <br /> Volatile Organic 8 Oxygenated Compounds by EPA Method 8260B <br /> Sequoia Analytical - San Carlos <br /> Reporting <br /> Analyte Result Lumt Units Dilution Batch Prepared Analyzed Method Notes <br /> MW-4 L11007745 Water Sampled 10/10/01 11.40 Received: 10/12/0107 35 <br /> Ethanol ND 1000 ugA 1 1100051 10/15/01 10/15/01 EPA 8260B <br /> 1,2-Dibromoethane ND 20 <br /> 1,2-Dichloroethane <br /> ND 20 <br /> ND 20 <br /> Di-isopropyl ether " <br /> Ethyl tert-butyl ether ND 20 " <br /> Methyl tert-butyl ether 9.0 20 n " <br /> Tert-amyl methyl ether ND 20 <br /> Tert-butyl alcohol ND 100 <br /> Surrogate 1,2-Diehloroethane-d4 103% 76.114 <br /> Surrogate Toluene-d8 103% 88-110 " <br /> MW-5 L110077-06 Water Sampled 10110/011458 Received 10/12/0107:35 <br /> Ethanol ND 1000 ugA 1 1100063 1015/01 10/15/01 EPA 8260B <br /> 1,2-Dibromoethane ND 20 <br /> 1,2-Dichloroethane ND 20 " n <br /> Di-isopropyl ether ND 20 <br /> Ethyl tett-butyl ether ND 20 <br /> Methyl tert-butyl ether ND 20 <br /> Tart-amyl methyl ether ND 20 " w <br /> Tart-butyl alcohol ND 100 " <br /> Surrogate 1,2-Dichloroethane-d4 102% 76-114 <br /> Surrogate Toluene-d8 107% 88-110 " <br /> MW-6 L710077-0 Water Sampled 10110/0114-10 Received- 10/12/0107:35 <br /> Ethanol ND 1000 ug/l 1 1100051 10/15/01 10/15/01 EPA 8260E <br /> 1,2-Dibromoethane ND 20 <br /> 1,2-Dichloroethane ND 20 0 " <br /> Di-isopropyl ether ND 20 " <br /> Ethyl teat-butyl ether ND 20 <br /> Methyl tert-butyl ether ND 20 <br /> Tert-amyl methyl ether ND 20 " <br /> Tert-butyl alcohol ND 100 " " , , " • <br /> Surrogate 1,2-Dkhloroethane-d4 970% 76-114 " <br /> Surrogate Toluene-d8 106% 88-110 " <br /> Sequoia Analytical-San Carlos The results to this report apply to the samples analysed m accordwer with the chain of <br /> custody document Thea analytical report must be reproduced in its ennrmy <br /> Page 7 of 16 <br />