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885 Jarvis Drive <br /> Sequoia Marganliill CA93037 <br /> 4D (408)776 9600 <br /> IW Analytical FAX(408)782 6308 <br /> www sequoialabs c0 <br /> Sector-Rancho Cordova(ARCO) Project ARCO#4932,Stockton,CA MNA0375 <br /> 3017 Kilgore Rd Suite 100 Project Number 38984 Reported <br /> Rancho Cordova CA,95670 Project Manager Rusty Benkosky 01/28/04 16 50 <br /> Volatile Organic Compounds by EPA Method 8260B-Quality Control <br /> Sequoia Analytical-Petaluma <br /> Reporting Spike Sotuee %REC RPD <br /> Analyte Result Limit Units Level Result %REC Limits RPD Limit Notes <br /> Batch 4010397-EPA 5030E waters <br /> Blank(4010397-BLK1) Prepared&Analyzed 01/21/04 <br /> Xylenes(total) ND 0 50 ug/l <br /> Surrogate Dtbromofluoromethane 638 600 106 84-121 <br /> Surrogate 1 1-Dichloroethane-d4 5 92 600 99 74-135 <br /> Surrogate Toluene d8 6 63 600 110 84-119 <br /> Surrogate 4-Bromofluorobenzene 649 600 108 86-119 <br /> Laboratory Control Sample(4010397-BSI) Prepared&Analyzed 0112.110_4 <br /> Tert-amyl methyl ether 5 00 1 0 ug/l 500 100 78-117 <br /> Benzene 536 0 50 Soo 107 81-118 <br /> Tert-butyl alcohol 110 20 100 110 60-147 <br /> Di-isopropyl ether 5 75 1 0 Soo 115 70-125 <br /> 1,2-Dibromoethane(EDB) 4 63 050 5 00 93 85-125 . <br /> 1,2-Dichloroethane 4 93 0 50 5 00 99 77-126 <br /> Ethanol 159 100 100 159 55-200 <br /> Ethylbenzene 5 24 050 500 105 89-122 <br /> Ethyl tert-butyl ether 4 89 1 0 500 98 71-120 <br /> Methyl tert-butyl ether 5 04 0 50 Soo 101 70-122 <br /> Toluene 4 63 0 50 Soo 93 84-119 <br /> Xylenes(total) 160 0 50 15 0 107 86-132 <br /> Surrogate Dibromofluoromethane 6 89 600 115 84-122 <br /> Surrogate 1,1-Dichloroethane-d4 6 09 600 102 74-135 <br /> Surrogate Toluene-d8 649 600 108 84-119 <br /> Surrogate 4-Bromofluorobenzene 633 600 106 86-119 <br /> Laboratory Control Sample Dup(4010397-BSDI) Prepared&Analyzed 01/21/04 <br /> Tert-amyl methyl ether 5 28 1 0 ug/l 500 106 78-117 5 20 <br /> Benzene 5 43 050 500 109 81-118 1 20 <br /> Tert-butyl alcohol 113 20 100 113 60-147 3 20 <br /> Di-isopropyl ether 5 62 1 0 5 00 112 70-125 2 20 <br /> 1,2-Dibromoethane(EDB) 4 98 0 50 Soo 100 85-125 7 20 <br /> 1,2-Dichloroethane 4 87 050 $00 97 77-126 1 20 <br /> Ethanol 116 100 100 116 55-200 31 20 QR 02 <br /> Ethylbenzene 5 34 0 50 500 107 89-122 2 20 <br /> Ethyl tert-butyl ether 4 93 1 0 5 00-99-71-120-0 820 <br /> Methyl Cert butyl ether 5 12 050 5 00 102 70-122 2 20 <br /> Toluene 4 84 050 500 97 84-119 4 20 <br /> Xylenes(total) 164 0 50 15 0 109 86-132 2 20 <br /> Sequoia Analytical-Morgan Hill The results in this report apply to the samples analyzed in accordance with the chap <br /> of custody document Unless otherwise stated,results are reported on a wet weightip <br /> basis This analytical report must be reproduced in its entirety <br /> Page 26 of 30 <br />