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1455 McDowell Blvd,North Ste D <br /> Sequoia Petaluma,CA 949$4 <br /> (707)792-1865 <br /> Analytical FAX(707)792-0342 <br /> www sequoialabs com <br /> URS Corp-Sacramento Project Arco Site 2130,Stockton,CA P406495 <br /> 2870 Gateway Oaks Drive Suite 300 Project Number lntrim-50293 Reported <br /> Sacramento CA,95833 Project Manager Vernon P Elarth 07/29/04 17 56 <br /> Volatile Organic Compounds by EPA Method 8260B- Quality Control <br /> Sequoia Analytical - Morgan Hill <br /> Reporting Spice Source %REC RPD <br /> Analyte Result Limit Units Level Result °/.REC Lunits RPD Limit Notes <br /> Batch 4GO7024-EPA 5030B P/T <br /> Matrix Spike(4G07024-MSI) Source P406495-18 Prepared 07/07/04 Analyzed 07/08/04 <br /> tert-Amyl methyl ether 754 050 ugll 100 ND 75 82-140 QCO2 <br /> tert-Butyl alcohol 542 20 500 ND 108 56-131 <br /> Di-isopropyl ether 805 050 100 ND 80 76-130 <br /> 1,2-Dichloroethane 809 050 100 0 1 l 80 77-136 <br /> Ethanol 201 100 " 200 ND 100 31-143 <br /> Ethyl ten-butyl ether 776 050 " 100 ND 78 81-121 QCO2 <br /> Methyl tert-butyl ether 742 050 100 010 73 63-137 <br /> Surrogate 12-Drchloroethane-d4 560 500 112 78-129 <br /> Matrix Spike Dup(4G07024-MSDI) Source P406495-18 Prepared 07/07/04 Analyzed 07/08/04 <br /> tert-Amyl methyl ether 840 050 ugA 100 ND 84 82-140 11 20 <br /> tert-Butyl alcohol 574 20 500 ND 115 56-131 6 20 <br /> 0-isopropyl ether 857 050 100 ND 86 76-130 6 20 <br /> Dichloroethane 856 050 100 0 1 l 85 77-136 6 20 <br /> Ethanol 208 100 200 ND 104 31-143 3 20 <br /> Ethyl tert-butyl ether 840 050 100 ND 84 81-121 8 20 <br /> Methyl tert-butyl ether 820 050 100 010 81 63-137 10 20 <br /> Surrogate 11-Drchloroethane-d4 552 500 110 78-129 <br /> Batch 4GO7040-EPA 5030B PIT <br /> Blank(4G07040-BLKI) Prepared&Analyzed 07/07/04 <br /> tert-Amyl methyl ether ND 050 ugll <br /> tert-Butyl alcohol ND 20 " <br /> Di-isopropyl ether ND 050 " <br /> 1,2-Dichloroethane ND 050 " <br /> Ethanol ND 100 CC04 <br /> Ethyl cert butyl ether ND 050 " <br /> Methyl tett-butyl ether ND 050 " <br /> Surrogate 12 Dichloroethane-d4 224 230 90 78-129 <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 werght basis <br /> 0 This analytical report mast be reproduced ur its entirety <br /> Page 36 of 41 <br />