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1455 MCpowell Blvd,North Ste D <br /> a- ) Sequoia Petaluma,CA 94954 <br /> (707)792-0865 <br /> Analytical <br /> FAX(707)792-0342 <br /> wtivwsequoialabs.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: day 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-8(P312283-08)Water Sampled: 12/10/03 05:25 Received: 12/10/03 10:42 <br /> Surrogate:Dibromojluoromethane 98% 84-122 3120679 12123/03 12/24/03 EPA 8260B <br /> Surrogate: 1,2-Dichloroethane-d4 101% 74-135 <br /> Surrogate: Toluene-d8 87% 84-119 <br /> Surrogate:4-Bromofluorobenzene 93% 86-119 <br /> MW-8(P312283-08RE1)Water Sampled: 12/10/03 05:25 Received: 12/10/03 10:42 HT-04 <br /> Methyl tert-butyl ether 22000 500 ug/I 1000 4010083 01/07/04 01/08/04 EPA 8260B <br /> Surrogate:Dibromofluoromethane 105% 84-122 <br /> Surrogate: 1,2-Dichloroelhane-d4 107% 74-135 <br /> Surrogate: Toluene-d8 91% 84-119 <br /> Surrogate:4-Bromofluorobenzene 95% 86-119 " <br /> MW-9(P312283-09)Water Sampled: 12/10/03 04:13 Received: 12/10/03 10:42 <br /> 0ert-amyl methyl ether ND 1.0 ugll 1 3120679 12/23/03 12/24/03 EPA 8260B <br /> enzene ND 0.50 " <br /> Tert-butyl alcohol ND 20 " <br /> Di-isopropyl ether 1.5 1.0 <br /> 1,2-Dibromoethane(EDB) ND 0.50 " <br /> 1,2-Dichloroethane 6.5 0.50 " <br /> Ethanol ND 100 " <br /> Ethylbenzene ND 0.50 " <br /> Ethyl tert-butyl ether ND 1.0 " <br /> Methyl tent-butyl ether 2.0 0.50 " <br /> Toluene ND 0.50 <br /> Xylenes(total) ND 0.50 " <br /> Surrogate:Dibromofluoromethane 101% 84-122 " <br /> Surrogate: 1,2-Dichloroelhane-d4 101% 74-135 <br /> Surrogate: Toluene-d8 92% 84-119 " <br /> Surrogate:4-Bromofluorobenzene 96% 86-119 <br /> equoia Analytical-Petaluma The results in this report apply to the samples analyzed in accordance with the chain <br /> of custody document. Unless otherwise stated, results are reported on a wet weight <br /> basis. This analytical report must be reproduced in its entirety. <br /> Page 18 of 40 <br />