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1455 McDowell Blvd,North Ste D <br /> Sequoia Petaluma,CA 94954 <br /> ,2� (707)792-1865 <br /> Analytical <br /> FAX(707)792-0342 <br /> 10 1W www sequoialabs com <br /> URS Corp-Sacramento Project Arco Site 2186,Stockton,CA P404354 <br /> 2870 Gateway Oaks Drive Suite 300 Project Number G09JZ-0307 Reported <br /> Sacramento CA,95833 Project Manager Vernon P Elartb 04/28/04 16 54 <br /> Volatile Organic Compounds by EPA Method 8260B - Quality Control <br /> Sequoia Analytical - Petaluma <br /> Reporting Spike Source %REC RPD <br /> Ana]y[e Result Limit Units Level Result %REC Limits RPD Limit Notes <br /> Batch 4040558-EPA 5030 sods <br /> Blank(4040558-BLK1) Prepared&Analyzed 04/22/04 <br /> Tert-amyl methyl ether ND 00050 mg/kg <br /> Benzene ND 00050 " <br /> Teri-butyl alcohol ND 010 " <br /> Di-isopropyl ether ND 00050 " <br /> 1,2-Dtbromoethane(EDB) ND 00050 " <br /> 1,2-Dichloroetbane ND 00050 " <br /> Ethanol ND 020 " <br /> Ethylbenzene ND 00050 " <br /> Ethyl tent-butyl ether ND 00050 " <br /> Methyl tert-butyl ether ND 00050 " <br /> Toluene ND 00050 " <br /> ,domigylenes(total) ND 00050 " <br /> rrogate Dibromofluoromethane 00518 00500 104 81-116 <br /> Surrogate 12-Dichloroethane-d4 00510 00500 102 73-131 <br /> Surrogate Toluene-d8 00534 00500 107 82-119 <br /> Laboratory Control Sample(4040558-BSI) Prepared&Analyzed 04/22/04 <br /> Tert-amyl methyl ether 00514 00050 mg/kg 00500 103 74-126 <br /> Benzene 00490 00050 00500 98 75-123 <br /> Tert-butyl alcohol 0 860 010 100 86 66-129 <br /> Dr-isopropyl ether 00481 00050 00500 96 71-127 <br /> 1,2-Dtbromoethane(EDB) 00535 00050 00500 107 88-118 <br /> 1,2-Dichloroethane 00524 00050 00500 105 79-119 <br /> Ethanol 131 020 100 131 70-140 <br /> Ethylbenzene 0 0513 00050 00500 103 65 135 <br /> Ethyl tert-butyl ether 00500 00050 00500 100 72-123 <br /> Methyl tert-butyl ether 00489 00050 00500 98 70 125 <br /> Toluene 00484 00050 00500 97 76-123 <br /> Surrogate Dibromofluoromethane 00511 00500 102 81-116 <br /> Surrogate 12-Dichloroethane-d4 00492 00500 98 73-131 <br /> Surrogate Toluene-d8 00540 00500 108 82-119 <br /> Sequoia Analytical-Petaluma The results in this report apply to the samples analyzed in accordance with the chain of <br /> custody document Unless otherwise stated results are reported on a wet weight basis <br /> This analytical report must be reproduced in its entirety <br /> Page 9 of 13 <br />