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404 N Wiget Lane <br /> Sequoia Walnut Creek CA 94598 <br /> (925)988-9600 <br /> FAX(925)988-%73 <br /> www ww sequoialabs coin <br /> Gettler Ryan,Inc -Dublin Project Chevron <br /> 6747 SierraCourt Suite I Project Number Chevron 4 9-6258 Reported <br /> Dublin CA,94568 Project Manager Deanna L Harding 30-Apr-01 11 39 <br /> Volatile Organic Compounds by EPA Method 8260B <br /> Sequoia Analytical -Walnut Creek <br /> Reporting <br /> JAnalyte Result Limit Units Dilution Batch Prepared Analyzed Method Notes <br /> MW-1 (W104297-02)Water Sampled 12-Apr-01 08 45 Received 12-Apr-01 16 20 <br /> Ethanol ND 500 ug/l 1 1D18014 18-Apr-01 18-Apr-01 EPA 8260E <br /> tert-Butyl alcohol ND 50 " <br /> Methyl tert-butyl ether ND 20 " <br /> Di-isopropyl ether ND 20 " <br /> Ethyl tert-butyl ether ND 20 " <br /> tert-Amyl methyl ether ND 20 <br /> Surrogate Dbromofluaromethane 140 % 50-150 " <br /> Surrogate 1,2 Dichloroethane-d4 980% 50-150 " <br /> MW-2(W104297-03)Water Sampled 12-Apr-01 09 15 Received 12-Apr-01 16 20 <br /> Ethanol ND 500 ug/I l 1D18014 18-Apr-01 18-Apr-01 EPA 9260B <br /> tert-Butyl alcohol ND 50 " <br /> Methyl tert butyl ether ND 20 " <br /> -isopropyl ether ND 20 " <br /> 1 tert-butyl ether ND 20 <br /> Amyl methyl ether ND 20 " <br /> Surrogate Dibromofluoromethane 138 % 50-150 " <br /> Surrogate 1,2-Dtchloroethane-d4 980% 50-150 " <br /> MW-3(W104297-04)Water Sampled 12-Apr-01 09 39 Received 12-Apr-01 16 20 <br /> Ethanol ND 500 ug/I 1 1D18014 18-Apr-01 18-Apr-01 EPA 8260E <br /> tert-Butyl alcohol ND 50 " <br /> Methyl tert-butyl ether ND 20 " <br /> Di-isopropyl ether ND 20 <br /> Ethyl tut-butyl ether ND 20 <br /> tert-Amyl methyl ether ND 20 " <br /> Surrogate Dibromofluorom ethane 138% 50-150 " <br /> Surrogate 1,2-Dichloroethane-d4 100% 50-150 " <br /> i <br /> I <br /> ola Analytical-Walnut Creels The results in firs report apply to the samples analyzed in accordance with the chain of <br /> custody document This analytical report must be reproduced to its entirety <br /> Page 2 of 11 <br />