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1455 McDowell Blvd,North Ste D <br /> Sequoia Petaluma,CA 94954 <br /> a— ) (707)792-1865 <br /> qWr Analytical <br /> FAX 707 792-0342 <br /> www.sequoialabs.com <br /> URS Corp-Sacramento Project: Arco Site 5469,Stockton,CA P312283 <br /> 2870 Gateway Oaks Drive Suite 300 Project Number: WR36605 Reported: <br /> Sacramento CA,95833 Project Manager: Jay Johnson 01/12/04 18:12 <br /> Volatile Organic Compounds by EPA Method 8260B <br /> Sequoia Analytical-Petaluma <br /> Reporting <br /> Analyte Result Limit Units Dilution Batch Prepared Analyzed Method Notes <br /> MW-5(P312283-05)Water Sampled: 12/10/03 07:22 Received: 12/10/03 10:42 <br /> Surrogate: 1,2-Dichloroethane-d4 94% 74-135 3120679 12/23/03 12124/03 EPR 8260E <br /> Surrogate: Toluene-d8 84% 84-119 " <br /> Surrogate:4-Bromofluorobenzene 87% 86-119 <br /> MW-5(P312283-05RE1)Water Sampled: 12/10/03 07:22 Received: 12/10/03 10:42 HT-04 <br /> Methyl tert-butyl ether 1200 25 ugR 50 4010114 01/09/04 01/09/04 EPA 8260B <br /> Surrogate:Dibromofluoromeihane 116% 84-122 <br /> Surrogate: 1,2-Dichloroethane-d4 123% 74-135 " <br /> Surrogate: Toluene-d8 100% 84-119 " <br /> Surrogate:4-Bromofluorobenzene 113% 86-119 <br /> MW-6(P312283-06RE1)Water Sampled: 12/10/03 06.50 Received: 12/10/03 10:42 HT-04 <br /> Tert-amyl methyl ether ND 100 ug/I 100 4010083 01/07/04 01/08/04 EPA 8260B <br /> 6enzene ND 50 " <br /> ert-butyl alcohol ND 2000 <br /> Di-isopropyl ether ND 100 <br /> 1,2-Dibromoethane(EDB) ND 50 " <br /> 1,2-Dichloroethane ND 50 " <br /> Ethanol ND 10000 " <br /> Ethylbenzene ND 50 <br /> Ethyl tert-butyl ether ND 100 <br /> Toluene ND 50 <br /> Xylenes(total) ND 50 <br /> Surrogate:Dibromqfluoromelhane 108% 84-122 " <br /> Surrogate: 1,2-Dichloroethane-d4 106% 74-135 <br /> Surrogate: Toluene-d8 90% 84-119 <br /> Surrogate:4-Bromofluorobenzene 96% 86-119 <br /> Sequoia Analytical-Petaluma The results in this report apply to the samples analyzed in accordance with the chain <br /> of custody document. Unless otherwise slated,results are reported on a wet weight <br /> basis. This analytical report must be reproduced in its entirety. <br /> Page 16 of 40 <br />