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819 Striker Avenue,Suite 8 <br /> Sequoia Sacramento,CA 95834 <br /> (D (916)929-9600 <br /> Analytical FAX cquoi 9210100 <br /> www seguoialalas coin <br /> URS-Sac Venture Oaks Project ARCO 6020,Manteca,CA <br /> 2520 Venture Oaks Way,Ste 250 Project Number 6020,Manteca,CA Reported <br /> Sacramento CA,95833-3200 Project Manager Verne Elarth 07/08/02 16 27 <br /> Volatile Organic Compounds by EPA Method 8260B <br /> Sequoia Analytical - Sacramento <br /> Reporting <br /> Analyte Result Limit Units Dilution Batch Prepared Analyzed Method ]dotes <br /> MW-5 S206331-01 Water Sam led 06/20/02 10 05 Received 06/21/02 09 10 <br /> Tert-butyl alcohol ND 50 ug/I 1 2060343 06/26/02 06/26/02 EPA 8260B <br /> Methyl tert-butyl ether ND 050 " <br /> Di-isopropyl ether ND 050 " <br /> Ethyl tert-butyl ether ND 050 " <br /> Tert-amyl methyl ether ND 050 " <br /> 1,2-Dichloroethane ND 050 " <br /> 1,2-Dibromoethane(EDB) ND 050 " <br /> Surrogate 12-DCA-d4 106% 60-140 " <br /> MW-6(5206331-02)Water Sampled 06/20/02 10 40 Received 06/21/02 09 10 <br /> Tert-butyl alcohol ND 50 up/l 10 2060364 06/27/02 06/27/02 EPA 826013 <br /> Methyl tert-butyl ether 260 50 " <br /> Di-isopropyl ether ND 50 " <br /> Ethyl tert-butyl ether ND 50 " <br /> Tert-amyl methyl ether ND 50 " <br /> 12-Dichloroethane ND 50 " <br /> 1,2-Dibromoethane(EDB) ND 50 " <br /> Surrogate 12-DCA-d4 110% 60-140 " <br /> MW-7(5206331-03)Water Sampled 06/20/02 11 10 Received 06/21/02 09 10 <br /> Tert-butyl alcohol ND 50 u0 1 2060364 06/27/02 06/27/02 EPA 82608 <br /> Methyl tert-butyl ether ND 050 " <br /> Di-isopropyl ether ND 050 " <br /> Ethyl tert-butyl ether ND 050 " <br /> Tert-amyl methyl ether ND 050 " <br /> 1,2-Dichloroethane ND 050 " <br /> 1,2-Dibromoethane(EDB) ND 050 " <br /> Surrogate 12-DCA-d4 120% 60-140 " <br /> �equoia Analytical-Sacramento The results in this report apply to the samples analyzed in accordance with the chain <br /> ojcusiody document This analytical report must be reproduced in its entirety <br /> Page Page 4 of 9 <br />