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Driw <br /> Sequoia 685l <br /> Morgan Hill,CCA A 955037037 <br /> (408)766 9600 <br /> Analytical FAX(408) Labsc 08m <br /> www sequoialabscom <br /> Sector-Rancho Cordova(ARCO) Project ARCO#595,Stockton,CA MMG0658 <br /> 3017 Kilgore Rd Suite 100 Project Number 38983 Reported <br /> Rancho Cordova CA,95670 Project Manager Rusty Benkosky 08/12/03 18 03 <br /> Volatile Organic Compounds by EPA Method 8260B- Quality Control <br /> Sequoia Analytical-Morgan Hill <br /> Reporting Spike Source %REC RPD <br /> Analyte Result Lunit Units Level Result %REC Limits RPD Lunt Notes <br /> Batch 3G30040-EPA 5030B PIT <br /> Laboratory Control Sample(3G30040-BSI) Prepared&Analyzed 07/30/03 <br /> Methyl tert-butyl ether 115 050 ugft 100 115 63-137 <br /> Benzene 977 050 too 977 78-124 <br /> Toluene 986 050 100 986 78-129 <br /> Surrogate 1 1-Dechloroethane-d4 518 " 500 104 78-129 <br /> Laboratory Control Sample(3G30040-BS2) Prepared&Analyzed 07/30/03 <br /> Methyl tert-butyl ether 935 050 ug/l 9 92 943 63-137 <br /> Benzene 5 14 050 640 803 78-124 <br /> Toluene 305 050 297 103 78-129 <br /> Gasoline Range Organics(C6-CIO) 486 50 440 110 70-113 <br /> Surrogate 1 2-Dechloroethane-d4 538 Soo 108 78-129 <br /> •Matrix Spike(3G30040-MSI) Source MMG0413-01 Prepared 07/30/03 Analyzed 07/31/03 <br /> Methyl tert-butyl ether 450 5 0 ugll 992 370 806 63-137 <br /> Benzene 486 5 0 640 ND 759 78-124 QM-07 <br /> Toluene 289 5 0 297 ND 973 78-129 <br /> Gasoline Range Organics(C6-C 10) 4470 500 4400 480 907 70-113 <br /> Surrogate 1 2-Dichloroethane-d4 547 500 109 78-119 <br /> Matrix Spike Dup(3G30040-MSDI) Source MMG0413-01 Prepared 07/30/03 Analyzed 07/31/03 <br /> Methyl tert-butyl ether 446 5 0 ug/l 992 370 766 63-137 0 893 13 <br /> Benzene 45 9 5 0 640 ND 71 7 78-124 571 12 QM-07 <br /> Toluene 277 50 297 ND 933 78-129 424 10 <br /> Gasoline Range Organics(C6-C 10) 4400 500 4400 480 891 70-113 158 9 <br /> Surrogate 1 2-Dichloroelhane-d4 553 300 111 78-129 <br /> Batch 3HO4010-EPA 50308 PIT <br /> Blank(3H04010-BLKI) Prepared&Analyzed 08/04/03 <br /> Ethanol ND 100 ug/1 0-09 <br /> tert-Butyl alcohol ND 20 A-01 <br /> Methyl tert-butyl ether ND 050 " <br /> Di-isopropyl ether ND 050 " <br /> Ethyl cert-butyl ether ND 050 " <br /> tert-Amyl methyl ether ND 050 " <br /> 1,2-Dichloroethane ND 050 0-09 <br /> 1,2-Dibromeethane(EDB) ND 050 " <br /> Benzene ND 050 " <br /> Sequoia Analytical-Morgan Hill 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 /> 15 of 19 <br />