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1455 McDowell Blvd,North Ste p <br /> Sequoia Petaluma,CA 94954 <br /> k. Analytical FAX(70)792-01342 <br /> www.seguoi alabs.corn <br /> URS Corp-Sacramento Project: Arco Site 5469,Stockton,CA P406178 <br /> 2870 Gateway Oaks Drive Suite 300 Project Number: WR36605 Reported: <br /> Sacramento CA,95833 Project Manager: Jay Johnson 06/30/04 13:08 <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-10(P406178-10)Water Sampled:06/08/04 06:26 Received:06/08/04 11:30 <br /> Xylenes(total) ND 0.50 ug/i 1 4060456 06/21/04 06/21/04 EPA 8260B <br /> Surrogate:Dibromofluoromethane 116% 84-122 <br /> Surrogate: 1,2-Dichloroethane-d4 114% 74-135 <br /> Surrogate: Toluene-d8 114% 84-119 " <br /> Surrogate:4-Bromofluorobenzene 110% 86-119 <br /> MW-10(P406178-10REI)Water Sampled:06/08/04 06:26 Received:06/08/04 11:30 <br /> Methyl tert-butyl ether 85 2.5 ugll 5 4060462 06/22/04 06/22/04 EPA 8260B <br /> Surrogate:Dibromofluoromethane 116% 84-122 <br /> Surrogate:1,2-Dichloroethane-d4 117% 74-135 <br /> Surrogate: Toluene-& 104% 84-119 <br /> Oirtogate:4-Bromofluorobenzene 103% 86-119 <br /> Sequoia Analytical-Petaluma The results in this report apply to the samples analyzed in accordance with the <br /> chain of custody document. Unless otherwise stated, results are reported on a wet <br /> weight basis. This analytical report must be reproduced in its entirety, <br /> i <br /> 7 <br /> Page I2 of 37 <br /> f <br /> t <br />