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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 /> www sequotalabs com <br /> SECOR International-Rancho Cordova Project Tosco 1205,Lathrop,CA <br /> 3017 Kilgore Road,Suite 100 Project Number N/A Reported <br /> Rancho Cordova CA,95670 project Manager Rusty Benkosky 06/14/02 1 1 28 <br /> BTEX by EPA Method 8260B <br /> Sequoia Analytical - Sacramento <br /> Reporting <br /> Analyte. Result Linut Units Dilution Batch Prepared Analyzed Method Notes <br /> GP-1 (5206079-11)Water Sampled 06/05/02 10 25 Received 06/06/02 17_35__ <br /> Ethanol ND 1000 ug/1 20 2060151 06/13/02 06/14/02 - EPA 8260B <br /> Tert-butyl alcohol ND 100 " <br /> Methyl tert-butyl ether ND 10 <br /> Di-isoprop}I ether ND 10 " <br /> Ethyl tert-butyl ether ND 10 " <br /> Tert-amyl methyl ether ND to " <br /> 1,2-13tchloroethane ND 10 " <br /> 1,2-Dibromoethane(EDB) ND 10 " <br /> Benzene 44 10 " <br /> Ethylbenzene 830 10 " <br /> Toluene 260 10 " <br /> Xylenes(total) 2500 10 " <br /> Gasoline(C6-C10) 17000 1000 <br /> Surrogate Toluene-d8 100% 60-140 " <br /> Surrogate 4-BFB 117% 60-140 " <br /> Surrogate 12-DC4-d4 105% 60-140 " <br /> GP-2(5206079-12)Water Sampled 06/05/02 11 30 Received 06/06/02 17 35 <br /> Ethanol ND 2500 ug/1 '50 2060151 06/13/02 06/14/02 EPA 8260E <br /> Tert-butyl alcohol ND 250 <br /> Methyl tert-butyl ether ND 25 " <br /> Di-isopropyl ether ND 25 " <br /> Ethyl tert-butyl ether ND 25 " <br /> Tert-amyl methyl ether ND 25 <br /> 1,2-Dichloroethane ND 25 " <br /> 1,2-Dibromoethane(EDB) ND 25 " <br /> Benzene 170 25 <br /> 1thylbenzene 1800 25 <br /> Toluene ND 25 <br /> Xylenes(total) 360 25 <br /> Gasoline(C6-C10) 16000 2500 " <br /> Surrogate Toluene-d8 103% 60-140 " <br /> Surrogate 4-BFB 121 % 60-140 " <br /> Surrogate 1,2-DCA-d4 102% 60-140 " <br /> Sequoia 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 Page 5 of 12 <br />