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819 Striker Ave Ste 8 <br /> Sequoia Sacramento, 95834 <br /> (916)916)92 923-9600 <br /> Analytical FAX(9 -0100 <br /> www sequoialauoialabs com <br /> Gettler-Ryan-Dublin - Project Former Unocal'0187,Stockton,CA S302221 <br /> 6747 Sierra Court,Ste 3 Project Number NIA Reported <br /> Project Mana er Deanna L Hardin 02/28/03 19 02 <br /> Dublin CA,94568 - g g <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 /> U-9(5302221-10)Water Sampled 02/05/03 12 00 Received 02107/03 10 30 <br /> Purgeable Hydrocarbons - - ND _ 50 ug/l - 1 -3020224 -02/18/03 02/18/03 EPA 8015/8021 <br /> Benzene ND 050 " <br /> Toluene ND 0 50 " <br /> Ethylbenzene ND 050 " <br /> Xylenes(total) ND 050 " <br /> Methyl tert-butyl ether ND 2 0 " <br /> y <br /> Surrogate a,a,a-Trtlluorotoluene - 91 % 60-140 <br /> U-10(5302221-11)Water Sampled 02/05/031545 Received 02/07/03 10 30 <br /> Purgeable Hydrocarbons 99 -50 ug/I 1 3020224 02/18/03 02/19/03 EPA 8015/8021 <br /> Benzene 1 8 050 " <br /> Toluene - ND 0 50 " <br /> Ethylbenzene ND 050 " <br /> Xylenes(total) ND 050 " <br /> Methyl tent-butyl ether - = 4 Z - - 2 <br /> Surrogate a,a,a-Trefluorotoluene 91 % 60-140 " <br /> U-11 (S302221-12)Water Sampled 02/06/03 15 30 Received 02/07/03 10.30 <br /> Purgeable Hydrocarbons ND 50 ug/l 1 3020224 02/18/03 02/19/03 EPA 8015/8021 <br /> Benzene ND 0 50 " <br /> Toluene --— - —ND -Q 50 - ----- _ ---- <br /> Ethylbenzene ND 0 50 " <br />---=Xylenes(total) --==ND —O 50T <br /> Methyl tert-butyl ether ND 2 0 " <br /> Surrogate a,a,a-Trifluoiotoluene - 87% ,60.140- <br /> Sequoia Analytical - Sacramento The results in this report apply to the samples analyzed in accordance with the chain <br /> custody document Unless otherwise stated results are reported on a wee weight basis <br /> This analytical report must be reproduced to its entirety <br /> Page 7 of 33 <br />