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Dr 885 Jarvis Sequoia Ma�nn11il1,CA95037 37 a (408)776-9600 1► Analytical FAX(408)782-6308 www.sequoialabsxan URS Corporation[1] 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 Volatile Organic Compounds by EPA Method 8260B Sequoia Analytical - Sacramento Reporting Analyte Result Limit Units Dilution Batch Prepared Analyzed Method Notes ATR-2 LL0775-01 Water Sampled: 12/1710211.50 Received:12/19/0208:05 Tert-butyl alcohol 6.6 5.0 ug/1 1 2120497 12/31/02 12/31/02 EPA 8260B Methyl tert-butyl ether 16 0.50 " " Di-isopropyl ether ND 0.50 " Ethyl tett-butyl ether ND 0.50 " Tert-amyl methyl ether ND 0.50 Surrogate: 1,2-DCA-d4 116% 60-140 ATR-7 LL0775-02 Water Sampled* 12/17/02 11:25 Received:12/19/02 08:05 Tert-butyl alcohol ND 5.0 ug11 1 2120497 12/31/02 12/31/02 EPA 8260B Methyl tert-butyl cther ND 0.50 " " " " " Di-isopropyl ether ND 0.50 Ethyl tert-butyl ether ND 0.50 " Tert-amyl methyl ether ND 0.50 Surrogate:1,2-DCA-d4 109% 60-140 " ATR-8(MLL0775-03)Water Sampled: 12/17/02 12:15 Received: 12/19/02 08_:05 Art-butyl alcohol ND 5.0 ug/l 1 2120497 12/31/02 12/31/02 EPA 8260E ethyl tert-butyl ether 1.7 0.50 " Di-isopropyl ether ND 0.50 " Ethyl tert-butyl ether ND 0.50 Tert-amyl methyl ether ND 0.50 Surrogate: 1,2-DCA-d4 116% 60-140 ATR-12(MLL0775-04)Water Sampled:12/17/02 10:50 Received: 12/19/02 08:05 Tert-butyl alcohol ND 5.0 ug/1 1 2120497 12/31/02 12/31/02 EPA 8260B Methyl tert-butyl ether ND 0.50 Di-isopropyl ether ND 0.50 " Ethyl tert-butyl ether ND 0.50 Tert-amyl methyl ether ND 0.50 Surrogate:1,2-DCA-d4 113% 60-140 s 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. 4 of 8