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1) (70Sequoia 1455 McDowell Blvd,North Ste D <br /> Petaluma,CA 94954 <br /> Analytical <br /> ¢, <br /> 7)792-1865 <br /> 0 '%WA,nalytieal FAX(707)792-0342 <br /> www,sequoialabs.com <br /> URS Com-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 4010112-EPA 5030B waters <br /> Laboratory Control Sample Du (4010112-BSD1) Pre ared&Analyzed:01/08/04 <br /> Surrogate:Dibromofluorom ethane 4.67 ug/l 5.00 93 84-122 <br /> Surrogate: l,2-Dichloroethane-d4 5.11 5.00 101 74-135 <br /> Surrogate: Toluene-0 4.63 5.00 93 84-119 <br /> Surrogate:4-Bromofluorobenzene 4.84 5.00 97 86-119 <br /> Batch 4010114-EPA 5030B waters <br /> Blank(4010114-BLKI) Prepared&Analyzed:01/09/04 <br /> Tert-amyl methyl ether ND 1.0 ugll <br /> Benzene ND 0.50 " <br /> Tert-butyl alcohol ND 20 " <br /> Di-isopropyl ether ND 1.0 " <br /> �2-Dibromoethane(EDB) ND 0.50 " <br /> ,2-Dichloroethane ND 0.50 " <br /> Ethanol 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:DibromoJluoromethane 6.12 6.00 102 84-122 <br /> Surrogate: 1,2-Dichloroethane-d4 7.03 6.00 117 74-135 <br /> Surrogate: Toluene-d8 6.36 6.00 106 84-119 <br /> Surrogate:4-Bromofuorobenzene 6.17 6.00 103 86-119 <br /> Laboratory Control Sample(4010114-BSI) Prepared&Analyzed:01/09/04 <br /> Tert-amyl methyl ether 5.30 1.0 u9A 5.00 106 78-117 <br /> Benzene 5.17 0.50 5.00 103 81-118 <br /> Tert-butyl alcohol 122 20 100 122 60-147 <br /> Di-isopropyl ether 5,88 1.0 5.00 118 70-125 <br /> 12-Dibromoethane EDB 5.25 0.50 5.00 105 85-125 <br /> 1,2-Dichloroethane 6.20 0,50 5.00 124 77-126 <br /> Ethanol 169 100 100 169 55-200 <br /> Ethylbenzene 5.52 0.50 5.00 110 89-122 <br /> Ethyl tert-butyl ether 5.38 1.0 5.00 108 71-120 <br /> Methyl tort-butyl ether 5.42 0,50 5.00 108 70-122 <br /> Toluene 5.23 0.50 5.00 105 84-119 <br /> S quoia Analytical-Petaluma The results in this report apply to the samples analyzed in accordance with the chain <br /> 0of custody document. Unless otherwise stated, results are reported on a wet weight <br /> basis. This analytical report must be reproduced in its entirety. <br /> Page 35 or 40 <br />