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1 885 Jarvis Dr <br />Sequoa Marpn Hill, CA 95037 <br />(408)776-9600 <br />Analytical FAX (408)782-6308 <br />- www.sequoialabs.am <br />URS Corporation [11 Project: ARCO #2093, Tracy, CA MLL0596 <br />2870 Gateway Oaks Dr., Ste 300 Project Number: ARCO #2093, Tracy, CA Reported: <br />Sacramento CA, 95833 Project Manager: Vern Elarth 12/20/0211:42 <br />Total Purgeable Hydrocarbons and BTEX by DHS LUFT <br />Sequoia Analytical - Sacramento <br />Reporting <br />Analyte Result Limit Units Dilution Batch Prepared Analyzed Method Notes <br />SP (1-4) Composite (MLL0596-01) Soil <br />Sampled: 12/18/02 11:50 <br />Received: 12/18/02 10:35 <br />Purgeable Hydrocarbons <br />36 2.5 <br />mg/kg 1 2120309 12/18/02 12/18/02 DHS LUFT E <br />Benzene <br />0.11 0.025 <br />" <br />Toluene <br />0.12 0.025 <br />" <br />Ethylbenzene <br />0.41 0.025 <br />" <br />Xylenes (total) <br />2.7 0.025 <br />" <br />Surrogate: a,a,a-Tris luorotoluene <br />140% <br />60-140 <br />SP (5-8) Composite (MLL0596-02) Soil <br />Sampled: 12/18/02 12:00 <br />Received: 12/18/02 10:35 <br />Purgeable Hydrocarbons <br />ND 0.50 <br />mg/kg 1 2120309 12/18/02 12/19/02 DHS LUFT <br />Benzene <br />ND 0.0050 <br />Toluene <br />ND 0.0050 <br />" <br />Ethylbenzene <br />ND 0.0050 <br />" <br />Xylenes (total) <br />ND 0.0050 <br />Surrogate: a,a,a-Tris luorotoluene <br />67% <br />60-140 <br />SP (9-12) Composite (MLL0596-03) Soil <br />Sampled: 12/18/02 12:15 <br />Received: 12/18/02 10:35 <br />Purgeable Hydrocarbons <br />ND 0.50 <br />mg/kg 1 2120309 12/18/02 12/19/02 DHS LUFT <br />Benzene <br />ND 0.0050 <br />" <br />Toluene <br />ND 0.0050 <br />" <br />Ethylbenzene <br />ND 0.0050 <br />Xylenes (total) <br />ND 0.0050 <br />" <br />Surrogate: a,a,a-Trifluorotoluene <br />Sequoia Analytical - Morgan Hill <br />70% 60-140 <br />The results in this report apply to the samples analyzed in accordance with the chain of <br />custody document. Unless otherwise stated, results are reported on a wet weight basis. <br />This analytical report must be reproduced in its entirety. <br />3 of 6 <br />