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_ 819 Striker Ave Ste 8 <br /> Sequoia 7 Sacramento:CA 95834 <br /> Analytical. (916)921-9600 <br /> FAX(916)92 1-0100 <br /> www.sequoialabs.com <br /> Gettler-Ryan-Dublin Project: Former Unocal 5098,Stockton,CA 5308091 <br /> 6747 Sierra Court,Ste.1 Project Number: N/A - Reported: <br /> Dublin CA,94568 Project Manager: Deanna L.Harding 08/20/03 16:56 <br /> Gasoline\BTEX\Oxygenates by EPA method 8260B <br /> Sequoia Analytical - Sacramento <br /> Reporting <br /> Analyte Result Limit Units Dilution Batch Prepared Analyzed Method Notes <br /> QA (S308091-01)Water Sampled:08/03/03 00:00 Received:08/05/03 17:35 <br /> Benzene ND 0.50 ug/1 1 3080206 08/14/03 08/14/03 EPA 82608 <br /> Toluene ND 0.50 " <br /> Ethylbenzene ND 0.50 " <br /> Xylenes(total) ND 0.50 " <br /> Methyl tert-butyl ether ND 2.0 " <br /> Surrogate: 1,2-DCA-d4 136% 60-140 " <br /> Surrogate: Toluene-d8 83% 60-140 " <br /> Surrogate:4-BFB 97% 60-140 <br /> MW-1 (S308091-02)Water Sampled:08/05/03 13:25 Received:08/05/03 17:35 <br /> Benzene ND 0.50 ug/I 1 3080160 08/18/03 08/19/03 EPA 82606 <br /> Toluene ND 0.50 " <br /> Ethylbenzene ND 0.50 " <br /> Xylenes(total) ND 0.50 " <br /> Methyl tett-butyl ether ND 2.0 " <br /> Surrogate:1,2-DCA-d4 102% 60-140 " <br /> Surrogate: Toluene-d8 101 % 60-140 " <br /> Surrogate:4-BFB 106% 60-140 " <br /> MW-2(S308091-03)Water Sampled:08/05/03 15:45 Received:08/05/03 17:35 <br /> Benzene 140 0.50 ug/l 1 3080160 08/18/03 08/19/03 EPA 8260B <br /> Toluene 22 0.50 " " " " " <br /> Ethylbenzene 180 0.50 " <br /> Xylenes(total) 550 0.50 " <br /> Methyl tert-butyl ether ND 2.0 " <br /> Surrogate: 1,2-DCA-d4 102% 60-140 " <br /> Surrogate: Toluene-d8 98% 60-140 " <br /> Surrogate:4-BFB 98% 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.Unless otherwise slated,results are reported on a wet weight basis. <br /> This analytical report must be reproduced in its entirety. <br /> Page 10 of 117 <br />