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1455 McDowell Blvd,North Ste D <br /> Sequoia Petaluma,CA 94954 <br /> (707)792-036565 <br /> Analytical FAX(707) 42 <br /> . www sequoialabs labs c coin <br /> iURS Corp-Sacramento Protect Arco Site 6020,Manteca,CA P307347 <br /> 2870 Gateway Oaks Drive State 300 Project Number W 836616 Reported <br /> Sacramento CA,95833 Project Manager Vernon P Elarth 07/30/03 17 32 <br /> Volatile Organic Compounds by EPA Method 8260B- Quality Control <br />' Sequoia Analytical - Petaluma <br /> Reporting Spike Source %REG RPD <br /> Analyte Result Limit Units Level Result %REC Limits RPD Limit Notes <br /> Batch 3070564-EPA 5030 sails <br /> Blank(3070564-BLKI) Prepared&Analyzed 07/26/03 <br /> Tert-amyl methyl ether ND 00050 mg/kg <br /> Benzene ND 0 0050 <br /> Tert-butyl alcohol ND 010 <br /> Di-isopropyl ether ND 0 0050 " <br /> 1,2-Dibromoethane(EDB) ND 0 0050 <br /> 1,2-Dtchloroethane ND 0 0050 <br /> Ethanol ND 020 <br /> Ethylbenzene ND 00050 " <br />' Ethyl tert butyl ether ND 00050 " <br /> Methyl tent-butyl ether ND 00050 <br /> Toluene ND 00050 " <br /> lens(total) ND 00050 " <br /> MINKirrogate Dibromofluoromethane 00482 00450 107 81-126 <br /> Surrogate 1 2-Dschloroethane-d4 00470 00450 104 73-131 <br /> Surrogate Toluene-d8 00502 00450 112 82-129 <br /> Laboratory Control Sample(3070564-BSI) Prepared&Analyzed 07/26/03 <br /> Benzene 00489 00050 mg/kg 00500 98 75-123 <br /> Methyl tert-butyl ether 00519 00050 00500 104 78-125 <br /> Toluene 00468 00050 00500 94 76-123 <br /> Surrogate Dibromofluoromethane 00494 ol00450 110 81-126 <br /> Surrogate 12-Drchloroethane-d4 00482 00450 107 73-131 <br />' Surrogate Toluene-d8 00515 00450 114 82-129 <br /> Laboratory Control Sample Dup(3070564-BSDI) Prepared&Analyzed 07/26/03 <br /> Benzene 00463 0 0050 mg/kg 00500 93 75-123 5 35 <br />' Methyl tert-butyl ether 00490 0 0050 11 00500 96 78-125 8 35 <br /> Toluene 00452 00050 00500 90 76-123 3 35 <br /> Surrogate Dibromofluoromethane 00480 00450 107 81-126 <br />' Surrogate 1 1-D,chloroelhane-d4 00460 00450 102 73-131 <br /> Surrogate Toluene-d8 00496 00450 110 81-129 <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 10 of 13 <br />