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- 1 <br /> 1455 McDowell Blvd North Ste D <br /> - j <br /> PelCA 94954Se <br /> Sequoia (707) <br /> 792 1865 <br /> Analytical FAX equoi 792 0342 <br /> corn FAX <br /> squvialabs tom <br /> is <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 Lima Units Dilution Batch Prepared Analyzed Method Note <br /> MW-1 (P406422-01)Water Sampled 06/22/04 07 03 Received 06/22/0412 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-Dtchloroethane 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 Dtbromofluoromethane 103% 84-122 <br /> Surrogate 1,2-Dtchloroethane-d4 106% 74-135 " " " to <br /> Surrogate Toluene-d8 105% 84-119 " " <br /> Surrogate 4-Bromofluorobenzene 111 % 86-119 " <br /> -1 (P406422-01RE1)Water Sampled 06/22/04 07 03 Received 06/22/04 12 15 <br /> enzene 28000 500 ug/1 1000 4070076 07/06/04 07/06/04 EPA 8260E <br /> Toluene 31000 500 <br /> Xylenes(total) 59000 500 <br /> Surrogate Dtbromofluoromethane 136% 84-122 S01 <br /> Surrogate 12-Dtchloroethane-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/l 5 4070035 07/02/04 07/02/04 EPA 8260B <br /> Benzene ND 25 <br /> fent-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 /> Ethylbenzene ND 2 5 <br /> Ethyl tert-butyl ether ND 5 0 " <br /> Methyl tert-butyl ether ND 25 " <br /> Toluene ND 2 5 " <br /> Xylenes(total) ND 2 5 " <br /> Surrogate Dibromofluoromethane 109% 84-122 <br /> Surrogate 1,2-Dtchloroethane-d4 101 % 74-135 <br /> uola Analytical -Petaluma The results in this report apply to the samples analyzed in accordance with the thorn of <br /> custody document Unless otherwise stated results are reported on a wet ivetght bases <br /> This analytical report must be reproduced in its entirety <br /> Page 5 of 18 <br />