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819 Striker Avenue,Suite 8 <br /> Sequoia Sacramento,CA 95834 <br /> (916)921-9600 <br /> Analytical FAX(916)921-0100 <br /> Am Q www sequotalabs com <br /> SECOR international-Rancho Cordova Project ARCO 4493,Stockton,CA <br /> 3017 Kilgore Road,Stute too Project Number 4493,Stockton,CA Reported <br /> Rancho Cordova CA,95670 Project Manager Rusty Benkosky 04/10/02 16 29 <br /> Volatile Organic Compounds by EPA Method 8260B <br /> Sequoia Analytical-Sacramento <br /> Reporting <br /> Analyte Result Llmlt Units Dilution Batch Prepared Analyzed Method Not- <br /> AM46=67-04REII Water <br /> Sampled. <br /> Methyl tert-butyl ether 120 25 ug/I 5 2030283 03/22/02 03/23/02 EPA 8260B <br /> Surrogate l 2-DCA-d4 796% 60-140 <br /> Methyl tert-butyl ether 120 25 5 <br /> Surrogate Dibroinofluoromethane 816% 70-130 " <br /> Surrogate 12-DCA-d4 796% 70-130 " <br /> Surrogate Toluene-d8 864% 70-130 <br /> Surrogate 4-BFB 720% 70-130 1 " <br /> -5 S20 26 -05 Water Sampled 03/13/02 13 45 Received 3/15/02 12 45 <br /> Tert-butyl alcohol 23 50 ug/l 1 2030252 03/24/02 03/20/02 EPA 8260B <br /> Di-isopropyl ether ND 050 <br /> Ethyl tert-butyl ether ND 050 <br /> Tert-amyl methyl ether ND 050 <br /> 1,2-Dichloroethane 077 050 " <br /> thylene di nude ND 050 <br /> rrogate 1 2-DCA-d4 752% 60-140 " <br /> Benzene 27 050 <br /> Bromobenzene ND 050 <br /> Bromochloromethane ND 050 <br /> Brornodichloromethane ND 050 <br /> Bromoform ND 050 <br /> Bromomethane ND 10 <br /> n-Butylbenzene 15 050 " ^ <br /> sec-Butylbenzene 12 050 " <br /> tert-Butylbenzene 060 050 ^ <br /> Carbon tetrachloride ND 050 " <br /> Chlorobenzene ND 050 <br /> Chloroethane ND 050 " <br /> Chloroform ND 050 <br /> Chloromethane ND 050 " <br /> 2-Chlorotoluene ND 050 <br /> 4-Chlorotoluene ND 050 " <br /> Dibromochloromethane ND 050 " <br /> 1,2-Drbromoethane ND 050 " <br /> Dibromomethane ND 050 <br /> 1,2-Dibromo-3-chloropropane ND 10 h " <br /> 1,2-Dichlorobenzene ND 050 <br /> 1,3-Dichlorobenzene ND 050 " <br /> �equora Analytical-Sacramento The results in this report apply to the samples analyzed in accordance with the chain <br /> ojcustody document This analytical report must be reproduced in its entirety <br /> Page Page 12 of 27 <br />