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Sequoia 1455 McDowell Blvd North Ste D <br /> Petaluma CA 94954 <br /> (707)792-18651865 <br /> Analytical FAX(707)792-0342 <br /> www sequoialabs corn <br /> lb <br /> URS Corp-Sacramento Project Arco Site 6100,Tracy,CA P402493 <br /> 2870 Gateway Oaks Drive Suite 300 Project Number WR36619 Reported <br /> Sacramento CA,95833 Project Manager Jay Johnson 03/17/04 15 30 <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 4030015-EPA 5030B soils McOH <br /> Laboratory Control Sample Du 4030015-BSD1 Prepared&Anal zed 03/01/04 <br /> Tert-amyl methyl ether 203 10 mg/kg 2 00 102 74-126 05 35 <br /> Benzene 212 10 200 106 75-123 0 9 35 <br /> Tert-butyl alcohol 424 20 400 106 66-129 2 35 <br /> Di-isopropyl ether 2 06 10 2 00 103 71-127 7 35 <br /> 1 2-Dibromoethane(EDB) 221 10 2 00 110 88-118 3 35 <br /> 1,2-Dichloroethane 205 10 2 00 102 79-119 2 35 <br /> Ethanol 43 3 40 400 108 70-140 3 35 <br /> Ethylbenzene 225 1 0 200 112 65-135 1 35 <br /> Ethyl tert-butyl ether 1 98 1 0 2 00 99 72-123 7 35 <br /> Methyl tert-butyl ether 1 96 1 0 2 00 98 70-125 6 35 <br /> Toluene 225 1 0 2 00 112 76-123 0 4 35 <br /> ogate Dibromofluorom ethane 201 200 100 81-126 <br /> ogate 1 2-Dichloroethane-d4 196 2 00 98 73-131 <br /> Surrogate Toluene-d8 203 200 102 82-129 <br /> Batch 4030069-EPA 5030B soils McOH <br /> Blank(4030069-BLKI) _ Prepared&Analyzed 03/02/04 <br /> Tert-amyl methyl ether ND 10 mg/kg <br /> Benzene ND 0 20 " <br /> Tert-butyl alcohol ND 20 <br /> Di-isopropyl ether ND 1 0 " <br /> 12-Dibromoethane(EDB) ND 10 " <br /> 1,2-Dichloroethane ND 10 <br /> Ethanol ND 40 " <br /> Ethylbenzene ND 1 0 " <br /> Ethyl tert-butyl ether ND 1 0 <br /> Methyl tert-butyl ether ND 1 0 " <br /> Toluene ND 10 " <br /> Xylenes(total) ND 10 " <br /> Surrogate Dibromofluorom ethane 000865 000900 96 81-126 PEST <br /> Surrogate 1,2-Dichloroethane-d4 000822 000900 91 73-131 PEST <br /> Surrogate Toluene-d8 000923 000900 103 82-129 PEST <br /> oia 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 21 of 25 <br />