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1455 McDowell Blvd,North Ste D <br /> Sequoia Petaluma,CA 94954 <br /> (1) (707)792-1865 <br /> Analytical <br /> FAX(707)792-0342342 <br /> IUF <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-2(P312283-02)Water Sampled: 12/10/03 08.37 Received:12/10/03 10:42 <br /> Surrogate:Dibromofluoromethane 109% 84-122 3120679 12123103 12124103 EPA 8160E <br /> Surrogate: 1,2-Dichloroethane-d4 116% 74-135 <br /> Surrogate: Toluene-d8 96% 84-119 <br /> Surrogate: 4-Bromofluorobenzene 103% 86-119 <br /> MW-3(P312283-03)Water Sampled: 12/10/03 08:23 Received: 12/10/03 10:42 <br /> Tert-amyl methyl ether ND 1.0 ug/1 1 3120679 12/23/03 12/24/03 EPA 8260E <br /> Benzene ND 0.50 " <br /> Tert-butyl alcohol ND 20 " <br /> Di-isopropyl ether ND 1.0 " <br /> 1,2-Dibromoethane(EDB) ND 0.50 " <br /> 1,2-Dichloroethane ND 0.50 " <br /> Ethanol ND 100 " <br /> hylbenzene ND 0.50 <br /> hyl tert-butyl ether ND 1.0 <br /> Methyl tert-butyl ether 2.3 0.50 " <br /> Toluene ND 0.50 " <br /> Xylenes(total) ND 0.50 <br /> Surrogate:Dibromofluoromethane 128% 84-122 S-LIM <br /> Surrogate: 1,2-Dichloroethane-d4 129% 74-135 " <br /> Surrogate: Toluene-d8 106% 84-119 " <br /> Surrogate: 4-Bromofluorobenzene 108% 86-119 " <br /> MW-3(P312283-03RE1)Water Sampled: 12110/0308:23 Received: 12/10/03 10:42 HT-04 <br /> Methyl tert-butyl ether 1.7 0.50 ug/l 1 4010083 01/07/04 01/07/04 EPA 82606 <br /> Surrogate:Dibromofluoromethane 105% 84-122 <br /> Surrogate: 1,2-Dichloroethane-d4 105% 74-135 <br /> Surrogate: Toluene-d8 91 % 84-119 <br /> Surrogate:4-Bromofluorobenzene 9451a 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 entirely. <br /> Page 14 of40 <br />