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G) (701455 McDowell Blvd,North Ste> <br /> Sequoia Petaluma,CA 949544 <br /> Analytical FAX <br /> 7)792-1865 <br /> (707)792-0342 <br /> • www.sequoialabs.com <br /> URS Corp-Sacramento Project: Arco Site 5469,Stockton,CA P312283 <br /> 2870 Gateway Oaks Drive Suite 300 Project Number: WR36605 Reported: <br /> Sacramento CA,95833 Project Manager: Jay Johnson 01/12/04 18:12 <br /> Volatile Organic Compounds by EPA Method 8260B-Quality Control <br /> Sequoia Analytical -Petaluma <br /> Reporting Spike Source %REC RPD <br /> Analyte Result Limit Units Level Result %REC Limits RPD Limit Notes <br /> Batch 4010083-EPA 5030E waters <br /> Laboratory Control Sample Du 4010083-BSD1 Prepared&Analyzed:01/07/04 <br /> Surrogate: l,2-Dichloroethane-d4 4.87 ug/l 5.00 97 74-135 <br /> Surrogate: Toluene-d8 4.67 5.00 93 84-119 <br /> Surrogate:4-Bromofluorobenzene 5.05 5.00 101 86-119 <br /> Batch 4010084-EPA 5030B waters <br /> Blank(4010084-BLKI) T Prepared_&Analyzed:01/07/04 <br /> Tett-amyl methyl ether ND 1.0 ugA <br /> Benzene ND 0.50 " <br /> Tert-butyl alcohol ND 20 " <br /> Di-isopropyl ether ND 1.0 " <br /> 1,2-Dibromoethane(EDB) ND 0.500 <br /> " <br /> 2-Dichloroethane ND 0.50 " <br /> thanoI ND 100 " <br /> Ethylbenzene ND 0.50 " <br /> Ethyl tert-butyl ether ND 1.0 " <br /> Methyl tert-butyl ether ND 0.50 " <br /> Toluene ND 0.50 " <br /> Xylenes(total) ND 0.50 " <br /> Surrogate:Dibromofluorom ethane 6.35 6.00 106 84-122 <br /> Surrogate: 1,2-Dichloroethane-d4 6.24 6.00 104 74-135 <br /> Surrogate: Toluene-d8 6.14 6.00 102 84-119 <br /> Surrogate: 4-Bromof7uorobenzene 6.23 6.00 104 86-119 <br /> Laboratmi Control Sample 4010084-BSI) Preaced& Analyzed:01/07/04 <br /> Tert-amyl methyl ether 5,08 1.0 U9A 5.00 102 78-117 <br /> Benzene 5.22 0.50 5.00 104 81-118 <br /> Tert-butyl alcohol 111 20 100 111 60-147 <br /> Di-isopropyl ether 5.45 1.0 5.00 109 70-125 <br /> 1,2-Dibromoethane(EDB) 5.24 0.50 5.00 105 85-125 <br /> 1,2-Dichloroethane 5.42 0.50 5.00 108 77-126 <br /> Ethanol 163 loo 100 163 55-200 <br /> Ethylbenzene 5.34 0.50 5.00 107 89-122 <br /> Ethyl tert-butyl ether 5.02 1.0 5.00 100 71-120 <br /> Methyl tert-butyl ether 5.32 0.50 5.00 106 70-122 <br /> Toluene 5.00 0.50 5.00 loo 84-119 <br /> Xylenes(total) 16.2 0.50 15.0 108 86-132 <br /> Sequoia Analytical-Petaluma The results in this report apply to the samples analyzed in accordance with the chain <br /> of custody document. Unless otherwise slated,results are reported on a wet weight <br /> basis. This analytical report must be reproduced in its entirety. <br /> Page 32 of 40 <br />