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985 Jarvis Drive <br /> Sequoia Morgan Hill CA 95037 <br /> D— (408)776 9600 <br /> Analytical FAX(408)7826308 <br /> www sequoialabs com <br /> Secor-Rancho Cordova(ARCO) Project ARCO#2133,Rancho Cordova,CA MNCO535 <br /> 3017 Kilgore Rd Suite 100 Project Number N/P Reported <br /> Rancho Cordova CA,95670 Project Manager Rusty Benkosky 04/05/04 16 1$ <br /> Volatile Organic Compounds by EPA Method 8260B-Quality Control <br /> Sequoia Analytical- Morgan Hill <br /> Reporting Spike Source %R EC RPD <br /> Analyte Result Limit Units Level Result %REC Limits RPD Limit Notes <br /> Batch 4C2000t-EPA 5030B P/T <br /> Blank(4C20001-BLK1) Prepared&Analyzed 03/20/04 <br /> Gasoline Range Organics(C6-C10) ND 50 ug/l <br /> Ethanol ND 100 " <br /> ter(-Butyl alcohol ND 20 " <br /> Methyl tert-butyl ether ND 0 50 " <br /> Di-isopropyl ether ND 0 50 " <br /> Ethyl tent-butyl ether ND 0 50 " <br /> tent-Amyl methyl ether ND 0 50 " <br /> 12-Dichloroethane ND 0 50 " <br /> 1,2-Dibromoethane(EDB) ND 0 50 " <br /> Benzene ND 050 " <br /> Toluene ND 050 " <br /> thylbenzene ND 0 50 " <br /> ylencs(total) ND 050 <br /> Surrogate 1 1-Dichloroethane-d4 5 33 5 00 107 78-129 <br /> Laboratory Control Sample(4C2000_1-BSI) Prepared&_Analyzed 03/20/04 <br /> Ethanol 201 100 ug/l 200 100 31-143 <br /> tert-Butyl alcohol 47 7 20 500 954 56-131 <br /> Methyl tert butyl ether 104 0 50 100 104 63-137 <br /> Di-isopropyl ether 8 49 0 50 100 84 9 76-130 <br /> Ethyl tert-butyl ether 992 0 50 too 992 81-121 <br /> tert-Amyl methyl ether 102 0 50 100 102 82-140 <br /> 1,2-Dichloroethane 11 1 0 50 100 111 77-136 <br /> 1,2-Dibromoethane(EDB) 11 3 050 10 0 113 77-132 <br /> Benzene 9 33 0 50 10 0 93 3 69-124 <br /> Toluene 9 88 050 10 0 98 8 78-129 <br /> Ethylbenzene 9 69 050 10 0 969 84-132 <br /> Xylenes(total) 29 2 050 30 0 97 3 83-137 <br /> Surrogate 1 2-Dichloroethane-d4 5 19 5 00 104 78-129 <br /> Sequoia Analytical-Morgan Hill The results in this report apply to the samples analyzed to 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 16 of 21 <br />