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819 Sinker Avenue,Suite 8 Sequoia Sacramento,CA 9585834 a— ) (916)921-9600 jqW Analytical FAX(916)921-0100 www sequoialabs com i3RS-Sac Gateway Oaks Project ARCO 2093,Tracy,CA 2870 Gateway Oaks Dr,Ste 300 Project Number 2093,Tracy,CA Reported Sacramento CA,95833 Pmject Manager Vernon Elarth 07/16/02 17 03 Total Purgeable Hydrocarbons and BTEX by DHS LUFT Sequoia Analytical- Sacramento Reporting Analyte Result Lima Units Dilution Batch Prepared Analyzed Method Notes TR-2 S207012-01 Water Sampled 06/28/02 09 15 Received 07/01/02 08 00 Purgeable Hydrocarbons 170 50 ug/l 1 2070089 07/09/02 07/09/02 DHS LUFT HC-12 Benzene ND 050 Toluene ND 050 Ethylbenzene ND 050 Xylenes(total) ND 050 Surrogate a a a-Trt/luorotoluene 75% 60-140 ATR-4 5207012-02 Water Sampled 06/28/02 08 55 ,Received 07/01/02 08 00 _ Purgeable Hydrocarbons ND 50 ug/1 1 2070115 07/10/02 07/11/02 DHS LUFT Benzene ND 0 50 " " 07/11/02 " Toluene ND 050 Ethylbenzene ND 050 Xylenes(total) ND 0 50 Surrogate a aa-Trtfluorotoluene 85% 60-140 glWTR-5 5207012-03 Water Sampled 06/28/02 09 50 Received 07/01/02 08 00 nrgeable Hydrocarbons 67 50 ugfl 1 2070115 07/10/02 07/11/02 DHS LUFT HC-12 Benzene ND 050 07/11/02 " Toluene ND 050 Ethylbenzene ND 050 Xylenes(total) ND 050 Surrogate a a,a-Trti luorotoluene 93% 60-140 ATR-7 S207012-04 Water Sampled 06/28/02 08 35 Received 07/01/02 98 00 Purgeable Hydrocarbons ND 50 ug/1 1 2070115 07/10/02 07/12/02 DHS LUFT Benzene ND 050 07/11/02 " Toluene ND 050 Ethylbenzene ND 050 Xylenes(total) ND 0 50 Surrogate a,a,a-Trti luorotoluene 92910 60-140 " Sequoia Analytical-Sacramento The results in this report apply to the samples analyzed in accordance with the chain of custody document This analytical report must be reproduced in its entirety Page Page 2 of 11