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885 Jarvis Dr Sequoia Mcrgpn Ili8,CA 95037 (408)776-9600 IW Analytical FAX(408)782-6308 07 - www.segaoialabs.ccm URS Corporation[11 Project: ARCO#2093,Tracy,CA MLL0775 2870 Gateway Oaks Dr.,Ste 300 Project Number: ARCO#2093,Tracy,CA Reported: Sacramento CA,95833 Project Manager. Vern Elarth 01/10/03 12:48 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 ATR-2 LL0775-01 Water Sampled. 12/17/02 11:50 Received: 12/19/02 08:05 HT-04 Purgeable Hydrocarbons ND 50 ugA 1 3010078 01/07/03 01/07/03 EPA 8015/8021 Benzene ND 0.50 Toluene ND 0.50 Ethylbenzene ND 0.50 Xylenes(total) ND 0.50 Surrogate:a,a,a-Trifluorotoluene 96% 60-140 ATR-7(MLL0775-021 Water Sampled: 12/17/02 11:25 Received:12/19/02 08:05 HT-04 Purgeable Hydrocarbons ND 50 ug/1 1 3010078 01/07/03 01/07/03 EPA 8015/8021 Benzene ND 0.50 Toluene ND 0.50 Ethylbenzene ND 0.50 " Xylenes(total) ND 0.50 " Surrogate:a,a,a-Trifluorotoluene 97% 60-140 ATR-8 LL0775-03 Water Sampled: 12/17/02 12:15 Received: 12/19/02 08:05 HT-04 urgeable Hydrocarbons 420 200 ug/1 4 3010078 01/07/03 01/07/03 EPA 8015/8021 Benzene ND 2.0 " Toluene ND 2.0 " Ethylbenzene 6.4 2.0 Xylenes(total) 7.6 2.0 " Surrogate:a,a,a-Trifluorotoluene 97% 60-140 ATR-12(NILL0775-04)Water Sampled: 12/17/02 10:_50 Received: 12/19/02 08:05 HT-04 Purgeable Hydrocarbons ND 50 ug/I 1 3010078 01/07/03 01/07/03 EPA 8015/802I Benzene ND 0.50 Toluene ND 0.50 " Ethylbenzene ND 0.50 Xylenes(total) ND 0.50 Surrogate:a,a,a-Trifluorotoluene 95% 60-140 " Sequoia Analytical-Morgan Hill The results in this report apply to the samples analyzed in accordance with the chain of custody document. Unless otherwise stated,results are reported on a wet weight basis. This analytical report must be reproduced in its entirety. 3 of 8