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819 Striker Ave Ste 8 <br /> Sequoia Saammento,CA9ss34 <br /> 4D (916)921-9600 <br /> Analytical FAX(916)921-0100 <br /> www.sequoialabs.eom <br /> -Ryan-Dublin Project: Former Unocal 0187,Stockton,CA 5306048 <br /> 6747 Sierra Court,Ste.J Project Number: NIA Reported: <br /> Dublin CA,94568 Project Manager: Deanna L. Harding 06/16/03 15:43 <br /> Gasoline(2-Methylpentane to 1,2,4-Trimethylbenzene) and BTEX by EPA 8015M and 8021B <br /> Sequoia Analytical - Sacramento <br /> Reporting <br /> Analyte Result Limit Units Dilution Batch Prepared Analyzed Method Notes <br /> QA(S306048-01)Water Sampled:05/29/03 00:00 Received: 06/02/0313:40 - <br /> Purgeable Hydrocarbons ND 50 ug/1 1 3060085 06/06/03 06/06/03 EPA 8015/8021 <br /> Benzene ND 0.50 H It " <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: a,a,a-TriJluorotoluene 93% 60-140 " <br /> U-1 (5306048-02)Water Sampled:05/29/03 16:05 Received: 06/02/03 13:40 <br /> Purgeable Hydrocarbons 170 50 ug/I 1 3060085 06/06/03 06/06/03 EPA 8015/8021 <br /> Benzene 2.6 0.50 " <br /> Toluene ND 0.50 <br /> Ethylbenzene ND 0.50 <br /> Xylenes(total) ND 0.50 " <br /> Melhvl tert-butyl ether 6.1 2.0 <br /> SlWate: a,a,a-TriJluaroioluene 106% 60-140 ^ <br /> U-2_(5306048-03)Water Sampled:05/29/03 16:30 Received:06/02/03 13:40 <br /> Purgeable Hydrocarbons ND 50 ugll 1 3060085 06/06/03 06/06/03 EPA 8015/8021 <br /> Benzene ND 0.50 " <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:a,a,a-TriJluarotoluene 94% 60-140 " <br /> is Analytical - Sacramento The results in this report apply to the samples analyzed in accordance with the chain of <br /> custody document. Unless otherwise stated,results are reported on a wet weight basis. <br /> This analytical report must be reproduced in its entirety. <br /> Page 4 of 32 <br />