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819 Sinker Ave Ste 8 j Sequoia Sacramento,)92 gp 958G3g0 ' ► Analytical 15)921-0100 www scgequoialabs coin Gettler-Ryan-Dublin Project Former Unocal 0187,Stockton,CA 5302221 6747 Sierra Court,Ste J Project Number NIA Reported Dublin CA,94568 Project Manager Deanna L Harding 02/28/03 19 02 Gasoline (2-Methylpentane to 1,2,4-Trimethylbenzene) and BTEX by EPA 8015M and 8021B Sequoia Analytical - Sacramento Reporting - - Analyte Result Limit Units Dilution Batch Prepared Analyzed Method Notes U-21 (5302221-22)Water Sampled 02/05/03 09 30 Received 02/07/03 10 30 Purgeable Hydrocarbons - - 300 - 50 ugll 1 3020205 02/14/03 02/15/03 EPA 8015/8021 Benzene 43 050 " " " " " " Toluene ND 0 50 1p 11 11 " Ethylbenzene ND 050 " " " " " " Xylenes(total) ND 050 " Methyl tert-butyl ether 61 2 0 Surrogate a a a-Trifluorotoluene 94% 60-140 " U-22(5302221-23)Water Sampled 02/05/03 08 25 Received 02/07/03 10 30 Purgeable Hydrocarbons ND 50 ugn 1 3020205 02/14/03 02/15/03 EPA 8015/8021 Benzene ND 050 " Toluene ND 0 50 Ethylbenzene ND 0 50 Xylenes(total) ND 050 " Methyl tent-butyl ether - - _ND 2 0 M Surrogate a a a-Trifluorotoluene 87% 60-140 " • U-23(5302221-24)Water Sampled 02/05/03 07 45 Received 02/07/03 10 30 Purgeable Hydrocarbons ND 50 ug/l 1 3020205 02/14/03 02/15/03 EPA 901518021 Benzene ND 050 " " " " " " —Toluene -ND 050 �Ethylbenzene ND 0 50 �-- --Xylenes(total) _ —ND—0 0 50 Methyl tert-butyl ether _ -��-'- - ND^ 2 0 -11 _�- Surrogate a,a,a-Trifluorotoluene - -T - T -=90%-- -60-140 - - -' - - - - Sequoia Analytical - Sacramento The results in this report apply to the samples analyzed in accordance with the chain IV custody document Unless otherwise stated results are reported on a wet weight basis This analytical report must be reproduced in its entirety Page 11 of 33