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1455 McDowell North Ste <br /> Sequoia Petaluma, <br /> a,CA 949544 <br /> (D— (707)792-1865 <br /> 'WrFAAnalytical <br /> X(707)792-0342 <br /> . wwwsequoialabs.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-4(P312283-04RE1)Water Sampled: 12/10/03 07:55 Received: 12/10/03 10:42 HT-04 <br /> Tert-amyl methyl ether ND 100 ug/l 100 4010083 01/07/04 01/08/04 EPA 8260B <br /> Benzene 3400 50 " <br /> Tert-butyl alcohol ND 2000 " <br /> Di-isopropyl ether ND 100 " <br /> 1,2-Dibromoethane(EDB) ND 50 " <br /> 1,2-Dichloroethane 96 50 " <br /> Ethanol ND 10000 " <br /> Ethylbenzene ND 50 " <br /> Ethyl tert-butyl ether ND 100 <br /> Toluene ND 56 " <br /> Xylenes(total) ND 50 " <br /> Surrogate:Dibromofluoromethane 105% 84-122 " <br /> Surrogate: 1,2-Dichloroethane-d4 106% 74-135 <br /> �rrogate: Toluene-d8 90% 84-119 II <br /> Surrogate: 4-BromuJluorobenzene 93'zoo 86-119 <br /> MW-4(P312283-04RE2)Water Sampled: 12/10/03 07:55 Received: 12/10/03 10:42 FIT-04 <br /> Methyl tert-butyl ether 22000 1000 ug/l 2000 4010112 01/08/04 01/08/04 EPA 82608 <br /> Surrogate: Dibromglluoromethane 106% 84-1.22 " <br /> Surrogate: 1,1-Dichloroethane-d4 115% 74-135 " <br /> Surrogate: Toluene-d8 94% 84-119 " <br /> Surrogate:4-Bromofluorobenzene 110% 86-119 " <br /> MW-5(P312283-05)Water Sampled: 12/14/03 07:22 Received: 12/10/03 10:42 <br /> Tert-amyl methyl ether ND 1,0 ugA l 3120679 12/23/03 12/24/03 EPA 8260B <br /> Benzene 0.61 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 200 " <br /> Ethylbenzene ND 0.50 " <br /> Ethyl tert-butyl ether ND 1.0 " <br /> Methyl tert-butyl ether 660 0.54 E <br /> Toluene ND 0.50 " <br /> Xylenes(total) ND 0.50 " <br /> Surrogate:Dibromofluoromethane 93% 84-122 " <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 stated, results are reported on a wel weight <br /> basis. This analytical report must be reproduced in its entirety. <br /> Page 15 of 40 <br />