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15) 1455 McDowell talNorth SteQ`[�uQia Petalumum a,CA 9495444 <br /> (707)792-1865 <br /> Analytical FAX(707)792-0342 <br /> wwwsequoialabs.com <br /> URS Corp-Sacramento Project: Arco Site 5469,Stockton,CA P305380 <br /> 2870 Gateway Oaks Drive Suite 300 Project Number: WR36605 Reported: <br /> Sacramento CA,95833 Project Manager: ,lay Johnson 06/18/03 21:10 <br /> Volatile Organic Compounds by EPA Method 8260B <br /> Sequoia Analytical -Petaluma <br /> Reporting <br /> Analyte Result Limit Units Dilution Batch Prepared Analyzed Method Note <br /> MW-7(P305380-07)Water Sampled:05/19/03 04:26 Received:05/19/03 11:45 <br /> Tert-amyl methyl ether ND 1.0 ug/t 1 3050783 05/31/03 05/31/03 EPA 8260E <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 1.7 0.50 " <br /> Ethanol ND 100 " <br /> Ethyl tert-butyl ether ND 1.0 " <br /> Methyl tert-butyl ether ND 0.50 " <br /> Surrogate:Dibromofluoromethane 95 % 84-122 " <br /> Surrogate: 1,2-Dichloroethane-d4 97% 74-135 " <br /> Surrogate: Toluene-d8 98% 84-119 " <br /> MW-8(P305380-08)Water Sampled:05/19/03 05:44 Received:05/19/03 11:45 <br /> Tert-amyl methyl ether ND 200 ug/l 200 3050783 05/31/03 05/31/03 EPA 8260B <br /> WiNopropyl <br /> t-butyl alcohol ND 4000 <br /> ellicr ND 200 <br /> 1,2-Dibromoethanc(EDB) ND 100 " <br /> 1,2-Dichloroethane ND 100 " <br /> Ethanol ND 20000 " <br /> Ethyl tert-butyl ether ND 200 " <br /> Surrogate:Dibromofluoromethane 94 % 84-122 " <br /> Surrogate: 1,2-Dichloroethane-d4 97% 74-135 " <br /> Surrogate: Toluene-d8 99% 84-119 " <br /> MW-8(P305380-08RE1)Water Sampled:05/19/03 05:44 Received:05/19/03 11:45 <br /> Methyl tert-butyl ether 33000 500 ug/I 1000 3060010 06/02/03 06/02/03 EPA 8260B <br /> Surrogate:Dibromofluoromethane 108% 84-122 <br /> Surrogate: 1,2-Dichloroethane-d4 113 % 74-135 " <br /> Surrogate: Toluene-d8 108% 84-119 " <br /> Sequoia <br /> quoia Analytical -Petaluma The results in this report apply to the samples analyzed in accordance with the chain of <br /> custody document. Unless otherwise stated,results are reported on a wet weight basis. <br /> This analytical report must be reproduced in its entirety. <br /> Page 16 of 36 <br />