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1455 McDowell Blvd,North Ste D <br /> Sequoia Petaluma,CA 94954 <br /> 12)— (707)792-1865 <br /> Ali alytica➢ FAX(707)792-0342 <br /> • www.sequoialabs.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: Jay 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-5(P305380-05)Water Sampled: 05/19/03 08:28 Received:05/19/03 11:45 <br /> Tert-amyl methyl ether ND 100 ug/1 100 3050783 05/31/03 05/31/03 EPA 8260B <br /> Tert-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 /> Ethyl Cert-butyl ether ND 100 <br /> Methyl tert-butyl ether 2300 50 " <br /> Surrogate:Dibromofluoromethane 93% 84-122 " <br /> Surrogate: 1,2-Dichloroethane-d4 96% 74-135 " <br /> Surrogate: Toluene-d8 97% 84-119 <br /> MW-6(P305380-06)Water Sampled:05/19/03 09:24 Received:05/19/03 11:45 <br /> ert-amyl methyl ether ND 200 ugfl 200 3050783 05/31/03 05/3 UO3 EPA 8260B <br /> rt-butyl alcohol ND 4000 " <br /> i-isopropyl ether ND 200 " <br /> 1,2-Dibromoetbane(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 96% 74-135 <br /> Surrogate: Toluene-d8 97% 84-119 <br /> MW-6(P305380-06RE1)Water Sampled:05/19/03 09:24 Received:05/19/03 11:45 <br /> Methyl tent-butyl ether 59000 1000 ug/t 2000 3060010 06/02/03 06/02/03 EPA 8260B <br /> Surrogate:Dibromofluoromethane 106% 84-122 <br /> Surrogate: 1,2-Dichloroethane-d4 111 % 74-135 <br /> Surrogate: Toluene-d8 105% 84-119 " <br /> � <br /> The results in this report a to the samples analyzed Analytical-Petaluma p PP1Y l p y=ed 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 15 of 36 <br />