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1455 McDowell Blvd,North Ste D <br /> Sequoia Petaluma,CA 94954 <br /> (707)792-1865 <br /> Analytical FAX equoi labs co 2 <br /> www sequocalabs com <br /> URS Corp-Sacramento project Arco Site 2130,Stockton,CA P406495 <br /> 2870 Gateway Oaks Drive Suite 300 Project Number Intrim-50293 Reported <br /> Sacramento CA,95833 Project Manager Vernon P Blarth 07/29/04 17 56 <br /> BTEX by EPA Method 8260B <br /> Sequoia Analytical - Morgan Hill <br /> Reporting <br /> Analyte Result Lana Units Dhition Batch Prepared Analyzed Method Note <br /> MW-5(P406495-05)Water Sampled 06/23/04 05 47 Received 06/25/04 09 30 <br /> I <br /> Benzene 3 3 050 ug/1 I 4GO7003 07/07/04 07/07/04 EPA 8260B <br /> Ethylbenzene 14 0 50 " <br /> Toluene 87 0 50 " <br /> Xylenes(total) 10 050 " <br /> Surrogate 12-Dtchloroethane-d4 109% 78-129 " <br /> MW-7(P406495-06)Water Sampled 06/23/04 02 35 Received 06/25/04 09 30 <br /> Benzene 079 0 50 ugll I 4GO7003 07/07/04 07/07/04 EPA 8260B <br /> Ethylbenzene ND 050 " <br /> Toluene ND 0 50 " <br /> Xylenes(total) 061 050 " <br /> Surrogate 1,2-Dtchloroethane-d4 106% 78-129 " <br /> MS-2A(P406495-07)Water Sampled 06/23/04 06 40 Received 06/25/04 09 30 <br /> enzene 052 050 ug/l 1 4GO7003 07/07/04 07/07/04 EPA 8260B <br /> 1pthylbenzene ND 050 <br /> Toluene ND 050 " <br /> Xylenes(total) ND 050 " <br /> Surrogate 1,2-Dtchloroethane-d4 109% 78-129 " <br /> MS-2B(P406495-08)Water Sampled 06/23/04 07 38 Received 06/25/04 09 30 <br /> Benzene 0 50 050 ugh 1 4GO7003 07/07/04 07/07/04 EPA 8260B <br /> Ethylbenzene ND 050 <br /> Toluene ND 050 " <br /> Xylenes(total) ND 050 " <br /> Surrogate 1,2-Dtchloroethane-d4 109% 78-129 " <br /> -Petaluma The results in this report apply to the samples analyzed in accordance with the chain of <br /> Sequoia Analytical <br /> custody document Unless otherwise stated results are reported an a wet weight oasts <br /> • This analytical report must be reproduced in its entirety <br /> Page 8 of 41 <br />