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f <br /> 1455 McDowell Blvd North Ste D <br /> Sequoia Petaluma CA 94954 <br /> la�j (707)792 1365 <br /> Analytical <br /> FAX(707)792 4342 <br /> www sequoialabs Com <br /> • <br /> URS Corp-Sacramento Project Arco Site 6100,Tracy, CA P406422 <br /> 2870 Gateway Oaks Drive Suite 300 Project Number WR36619 Reported <br /> Sacramento CA,95833 Project Manager Jay Johnson 07/15/04 10 23 <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-1 (P406422-01)Water Sampled 06/22/04 07 03 Received 06/22/04 12 15 <br /> Tert-amyl methyl ether ND 250 ug/1 250 4070035 07/02/04 07/02/04 EPA 8260B <br /> Tert-butyl alcohol ND 5000 " <br /> Di-isopropyl ether ND 250 " <br /> 1,2-Dibromoethane(EDB) ND 120 " <br /> 1,2-Dichloroethane 1300 120 " <br /> Ethanol ND 25000 " <br /> Ethylbenzene 12000 120 " <br /> Ethyl tert-butyl ether ND 250 " <br /> Methyl tert-butyl ether ND 120 " <br /> Surrogate Dibromofluoromethane 103% 84-122 <br /> Surrogate 1 2-Dichloroethane-d4 106% 74-135 " <br /> Surrogate Toluene-d8 105% 84-119 " <br /> Surrogate 4-Bromofluorobenzene 111 % 86-119 <br /> rW-1 (P406422-O1RE1)Water Sampled 06/22/04 07 03 Received 06/22/04 12 15 <br /> Benzene 28000 500 ugll 1000 4070076 07/06/04 07/06/04 EPA 8260B <br /> Toluene 31000 500 " <br /> Xylenes(total) 59000 500 " <br /> Surrogate Dibronxofluoromethane 136% 84-122 Sol <br /> Surrogate 1,2-Dichloroethane-d4 127% 74-135 <br /> Surrogate Toluene-d8 116% 84-119 " <br /> Surrogate 4-Bromofluorobenzene 104% 86-119 <br /> MW-2 (P406422-02)Water Sampled 06/22/04 06 27 Received 06/22/04 12 15 <br /> Tert-amyl methyl ether ND 5 0 ug/1 5 4070035 07/02/04 07/02/04 EPA 8260B <br /> Benzene ND 2 5 " <br /> Tert-butyl alcohol ND 100 " <br /> Di-isopropyl ether ND 5 0 " <br /> 1,2-Dibromoethane(EDB) ND 2 5 " <br /> 1,2-Dichloroethane ND 2 5 " <br /> Ethanol ND 500 " <br /> Ethvlbenzene ND 2 5 " <br /> Ethyl tert-butyl ether ND 5 0 " <br /> Methyl tert-butyl ether ND 2 5 " <br /> Toluene ND 2 5 " <br /> Xylenes(total) ND 2 5 <br /> Surrogate Dibromofluoromethane 109% 84-122 " " <br /> Surrogate 12-Dichloroethane-d4 101 % 74-135 " " <br /> uoia 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 wel weight basis <br /> This analytical report must be reproduced in its entirety <br /> Page 5 of 18 <br />