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a— ) (707)1455 McDowell Blvd,North Ste D Sequoia Petaluma,CA 94954 792-1865 Analytical FAX(707)792 0342 www sequoialabs corn URS Corp-Sacramento Project Arco Site 2186,Stockton,CA P404458 2870 Gateway Oaks Drive Suite 300 Project Number WR36593 Reported Sacramento CA,95833 Project Manager Vernon P Elarth 04/22/04 17 51 BTEX by 8021B- Quahty Control Sequoia Analytical-Petaluma Reporting Spike Source %REC RPD Analyte Result Limit Units Level Result %REC Limits RPD Limit Notes Batch 4040500-EPA 5030,soils Blank 4040500-BLKI Prepared&Analyzed 04/21/04 Benzene Nib 00025 mg/kg Toluene ND 00025 " Ethylbenzene ND 0 0025 " Xylenes(total) ND 0 0025 " Surrogate a a a-Trifluorotoluene 0315 0 300 105 65-135 Laboratory Control Sample 4040500-BS1 Prepared&Analyzed 04/21/04 Benzene 0 0376 0 0025 mg/kg 00335 112 65-135 Toluene 0 193 00025 0 190 102 65-135 Ethylbenzene 0 0453 00025 00455 100 65-135 Xylenes(total) 0 217 00025 0 222 98 65-135 rrogate a a a-Tnfluorotoluene 0 316 0 300 105 65-135 atrix Spike 4040500-MS1 Source P404268-17 Prepared&Analyzed 04/21/04 Benzene 00662 0 0050 mg/kg 0 0670 0 00022 98 65-135 Toluene 0 316 0 0050 0 379 00031 83 65-135 Ethylbenzene 0 0683 0 0050 0 0910 000091 74 65-135 Xylenes(total) 0 323 0 0050 0 444 00049 72 65-135 Surrogate a a a-Trifluorotoluene 0 251 0 300 84 65-135 Matrix Spike Dup(4040500-MSD1) Source P404268-17 Prepared&Analyzed 04/21/04 Benzene 0 0623 0 0050 mg/kg 00670 0 00022 93 65-135 6 20 Toluene 0 305 0 0050 0 379 00031 80 65-135 4 20 Ethylbenzene 00653 0 0050 00910 0 00091 71 65-135 4 20 Xylenes(total) 0 308 0 0050 0 444 00049 68 65-135 5 20 Surrogate a a a-Tris luorotoluene 0 239 0 300 80 65-135 Sequoia Analytical-Petaluma 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 Page 7 of 9