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i <br /> I <br /> a— ) (71455 McDowell Blvd,North Ste D <br /> Sequoia Petaluma,CA 94954 <br /> Analytical FAX <br /> 07)7921365 <br /> 707)792 0342 <br /> www sequoialabs com <br /> URS Corp-Sacramento Project Arco Site 2186,Stockton,CA P404367 <br /> 2870 Gateway Oaks Drive Suite 300 Project Number G09JZ-0307 Reported <br /> Sacramento CA,95833 Project Manager Vernon P Elarth 05/05/04 17 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 4040558-EPA 5030 soils <br /> Blank(4040558-BLKI) Prepared&Analyzed 04/22/04 <br /> Tert-amyl methyl ether ND 0 0050 mg/kg <br /> Benzene ND 00050 " <br /> Tert-butyl alcohol ND 0 10 " <br /> Di-isopropyl ether ND 00050 " <br /> 1,2-Dibromoethane(EDB) ND 0 0050 " <br /> 1,2-Dtchloroethane ND 00050 " <br /> Ethanol ND 020 " <br /> Ethylbenzene ND 0 0050 " <br /> Ethyl tert-butyl ether ND 0 0050 " <br /> Methyl tert-butyl ether ND 0 0050 " <br /> Toluene ND 0 0050 " <br /> AINIJ�ylenes(total) ND 00050 " <br /> Wurrogate Dibromohuoromethane 00518 00500 104 81-126 <br /> Surrogate 1 2-Dichloroelhane-d4 00510 00500 102 73-131 <br /> Surrogate Toluene-d8 00534 00.500 107 82-129 <br /> Laboratory Control Sample(4040558-BSI) _ Prepared&Analyzed 04/22/04 <br /> Tert-amyl methyl ether 00514 00050 mg/kg 0 0500 103 74-126 <br /> Benzene 00490 00050 00500 98 75-123 <br /> Tert-butyl alcohol 0 860 0 10 1 00 86 66-129 <br /> Di-isopropyl ether 00481 00050 00500 96 71-127 <br /> 1,2-Dtbromoethane(EDB) 0 0535 00050 00500 107 88-118 <br /> 1,2-Dtchloroethane 0 0524 00050 00500 105 79-119 <br /> Ethanol 1 31 020 1 00 131 70-140 <br /> Ethylbenzene 0 0513 00050 00500 103 65-135 <br /> Ethyl tert-butyl ether 0 0500 00050 00500 100 72-123 <br /> Methyl tert-butyl ether 0 0489 00050 00500 98 70-125 <br /> Toluene 00484 00050 00500 97 76-123 <br /> Surrogate Dibromofluoromethane 00.511 00500 102 81-126 <br /> Surrogate 12-Dichloroethane-d4 00492 00500 98 73-131 <br /> Surrogate Toluene-d8 00540 00500 108 82-129 <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 stated results are reported on a wet weight <br /> basis This analytical report must be reproduced in its entirety <br /> Page 8 of 12 <br />