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1455 McDowell Blvd,North Ste D <br /> Sequoia Petaluma,}92 1865 <br /> 11WFAAnalytical <br /> X(70742 <br /> www sequoialabsalabs cnm <br /> URS Corp-Sacramento Project Arco Site 6020,Manteca,CA P406056 <br /> 2870 Gateway Oaks Drive Suite 300 Project Number lntrim-50681 Reported <br /> Sacramento CA,95833 Project Manager Vernon P Elarth 06/14/04 20 24 <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 %FEC Lunits RPD Limit Notes <br /> Batch 4FO7003-EPA 5030B PIT <br /> Blank(4F07003-BLKI) Prepared&Analyzed 06/07/04 <br /> Ethanol ND 100 u911 <br /> tert-Butyl alcohol ND 20 " <br /> Methyl tert-butyl ether ND 050 ' <br /> DL-Isopropyl ether ND 050 " <br /> Ethyl tert-butyl ether ND 050 " <br /> tert-Amyl methyl ether ND 050 " <br /> 1,2-Dtchloroethane ND 050 " <br /> 1,2-Dibromoethane(EDB) ND 050 " <br /> Surrogate 1 2-Dichloroelhane-d4 584 500 117 78-129 <br /> Laboratory Control Sample(4F07003-BSI) Prepared&Analyzed 06/07/04 <br /> Ethanol 249 100 ug/l 200 124 31-143 <br /> rt-Butyl alcohol 471 20 " 500 942 56-131 <br /> Methyl tert-butyl ether 101 050 Wo 101 63-137 <br /> Di-isopropyl ether too 050 too too 76-130 <br /> Ethyl cert butyl ether 105 050 100 105 81-121 <br /> tert-Amyl methyl ether 906 050 100 906 82-140 <br /> 1,2-Dtchloroethane 102 050 100 102 77-136 <br /> 1,2-Dibromoethane(EDB) 937 050 100 937 77-132 <br /> Surrogate 1 2-Dtchloroethane-d4 557 500 111 78-129 <br /> Laboratory Control Sample(4F07003-BS2) Prepared&Analyzed 06/07/04 <br /> Methyl tert-butyl ether 906 050 ug/l 992 91.3 63-137 <br /> Surrogate 1 2-Dtchloroethane-d4 S38 Soo 108 78-129 <br /> Laboratory Control Sample Dup(4F07003-BSD1) Prepared&Analyzed 06/07/04 <br /> Ethanol 226 100 ug/1 200 113 31-143 968 20 <br /> tert-Butyl alcohol 488 20 500 976 56-131 355 20 <br /> Methyl ter(-butyl ether 106 050 100 106 63-137 483 20 <br /> DI-isopropyl ether 105 050 100 105 76-130 488 20 <br /> Ethyl tert-butyl ether 114 050 100 114 81-121 822 20 <br /> cert-Amyl methyl ether 944 050 too 944 82-140 4 11 20 <br /> 1,2-Dtchloroethane 108 050 100 108 77-136 571 20 <br /> 1 2-Dibromoethane(EDB) 977 050 " too 977 77-132 418 20 <br /> Surrogate 1 2-Dtchloroethane-d4 567 500 113 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 wetght basis <br /> This analytical report must be reproduced in its entirety <br /> Page 16 of 20 <br />