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819 Striker Avenue,Suite 8 <br /> S@(lUflla Sacramento )9 95834 <br /> 9600 <br /> Analytical equoi 921-9600 <br /> FAX(916)921-0 100 <br /> �rnvw sequoialahs com <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 Notes <br /> MW-815206331-04)Water Sampled 06/20/02 11 35 Received 06/21/02 09 10 <br /> Tert-butyl alcohol ND 50 ug/l 1 2060364 06/27/02 06/27/02 EPA 8260B <br /> Methyl text-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 1 2-DCA-d4 111% 60-140 <br /> MW-9(S206331-05)Water Sampled 06/20/02 12.00 Received 06/21/02 09 10 <br /> Tert-butyl alcohol ND 50 ug/l 1 2060364 06/27/02 06/27/02 EPA 8260B <br /> Methyl tert-butyl ether ND 050 " <br /> Dt-isopropyl ether ND 050 " <br /> Ethyl tert-butyl ether ND 050 " <br /> Tert-amyl methyl ether ND 050 " <br /> 162-Dichloroethane ND 050 " <br /> 1,12-Dibromoethane(EDB) ND 050 " <br /> Surrogate 12-DCA-d4 114% 60-140 " <br /> MW-10($206331-06)Water Sampled 06/20/021225 Received 06/21/02 09 10 <br /> Tert-butyl alcohol ND 5 0 ug/l 1 2060364 06/27/02 06/27/02 EPA 8260H <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 113 Y. 60-140 <br /> Sequoia Analytical-Sacramento The results in this report apply to the samples analyzed in accordance with the chain <br /> of custody document This analytical report must be reproduced in tis entirety <br /> Page Page 5 of 9 <br />