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819 Striker Avenue,Scute 8 <br /> Sequoia Sacramento,CA 95834 <br /> (916)921-96 <br /> r� 00 <br /> A► <br /> Analytical FAX(916)921-0100 <br /> www sequocalabs com <br /> URS-Sac Gateway Oaks Project ARCO 2093,Tracy,CA <br /> 2870 Gateway Oaks Dr,Ste 300 Project Number 2093,Tracy,CA Reported <br /> Sacramento CA,95833 Project Manager Vernon Elarth 07/16/02 17 03 <br /> Volatile Organic Compounds by EPA Method 82608 <br /> Sequoia Analytical- Sacramento <br /> Reporting <br /> Analyte Result Limit Units Dilution Batch Prepared Analyzed Method Notes <br /> ATR-2 5207012-01 Water Sampled 06/28/02 09 15 Received 07/01/02 08 00 A-01 <br /> Tert-butyl alcohol ND 10 ug11 2 2070079 07/09/02 07/09/02 EPA 82606 <br /> Do-isopropyl ether ND 10 <br /> Ethyl tert-butyl ether ND 10 <br /> Tert-amyl methyl ether ND 10 <br /> Surrogate 12-DCA-d4 115% 60-140 " ^ <br /> ATR-2 S207012-01RE1 Water Sampled 06128/020915 Received 07/01/02 08 00 <br /> Methyl tert-butyl ether 300 25 ug/l 5 2070090 07/I0/02 07/10/02 EPA 8260B <br /> Surrogate 1 2-DCA-d4 108% 60-140 " <br /> ATR-4 5207012-02 Water Sampled 06/28/02 08 55 Received 07/01/02 08 00 <br /> Tert-butyl alcohol ND 50 ug/l 1 2070090 07/10/02 07/10/02 EPA 82606 <br /> Methyl tert-butyl ether ND 050 " ^ <br /> Di-isopropyl ether ND 050 " ^ <br /> Ethyl tert-butyl ether ND 050 <br /> AdUkTcrt-amyl methyl ether ND 050 " <br /> Surrogate 1,2-DCA-d4 104% 60-140 " <br /> ATR-5 S207012-03 Water Sam led 06/28/02 09 50 Received 07/01/02 08 00 <br /> Tert-butyl alcohol ND 50 ug/l 1 2070079 07/09/02 07/09/02 EPA 8260E <br /> Methyl tert-butyl ether 83 050 " ^ <br /> Di-isopropyl ether ND 050 <br /> Ethyl tert-butyl ether ND 050 <br /> i <br /> Tert-amyl methyl ether ND 050 ^ " <br /> Surrogate 12-DCA-d4 126% 60-140 " <br /> Sequoia Analytical-Sacramento The resulls in this report apply to the samples analyzed in accordance with the chain <br /> of cuslody document This analytical report must be reproduced in its entirety <br /> Page Page 4 of 11 <br />