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Sequoia 819 Striker Avenue Suite 8 <br /> Sacramento CA 95834 <br /> la) (9 16)921-9600 <br /> fAX(916)921-0100 <br /> Analytical wwwsequolalabs Com <br /> i <br /> SECOR International-Rancho Cordova Project ARCO 595,Stockton,CA <br /> 3017 Kilgore Road,Suite 100 Project Number NIA Reported <br /> Rancho Cordova CA,95670 Project Manager Rusty Benkosky 08/20/01 18 00 <br /> Volatile Oxygenate Compounds by EPA Method 8260A <br /> Sequoia Analytical - Sacramento <br /> Reporting <br /> Analyte Result Llml[ Units Dilution Batch Prepared Analyzed Method Notes <br /> MW4(5108070-04)Water Sampled 08/01/01 14 00 Received 08/06/01 12 27 <br /> Tert-butyl alcohol ND 1000 ug/l 5 1080132 08/13/01 08/13/01 EPA 8260A <br /> Methyl tert-butyl ether 1400 10 " 1 1. " <br /> Di-isopropyl ether ND 10 <br /> Ethyl tert-butyl ether ND 10 " <br /> Tert-amyl methyl ether ND 10 " <br /> 1,2-Dichloroethane 220 10 " <br /> Ethylene dibromtde ND 10 <br /> Surrogate 1 2-DCA-d4 113 % 60-140 " <br /> MW-5(S108070-05)Water Sampled 08/01/01 10 10 Received 08/06/01 12 27 <br /> Tert-butyl alcohol ND 200 ug/l 1 1080132 08/13/01 08/13/01 EPA 8260A <br /> Methyl tert-butyl ether 26 20 " <br /> Di-isopropyl ether ND 20 " <br /> tert-butyl ether ND 20 " <br /> amyl methyl ether ND 20 " <br /> -Dichloroethane 32 20 " <br /> Ethylene dibromtde_ ND 20 <br /> Surrogate 12-DCA-d4 106% 60-140 " <br /> MW-6(5108070-06)Water Sampled 08/01/01 10 30 Received 08/06/01 12 27 <br /> Tert-butyl alcohol ND 200 ug/l 1 1080132 08/13/01 08/I3101 EPA 8260A <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 /> 1,2-Dichloroethane ND 20 " <br /> Ethylene dibromtde ND 20 _ <br /> Surrogate 1 2-DCA-d4 107% 60-140 <br /> uoia Analytical -Sacramento The results in this report apply to the samples analyzed in accordance with the chain of <br /> custody document This analytical report must be reproduced in its entirety <br /> Page 6 of 13 <br />