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$85 Jarvis Drive <br /> - Sequoia Morgan Hill CA950J7 <br /> (408)79600 <br /> VWF Analytical FAX(4G8) 6308 <br /> www sequoiata82 aiabs coni <br /> Secor-Rancho Cordova(ARCO) Project ARCO#0595,Stockton,CA MNA0270 <br /> 3017 Kilgore Rd Suite 100 Project Number 38983 Reported <br /> Rancho Cordova CA,95670 Project Manager Rusty Benkosky 01/26/04 14 13 <br /> Volatile Organic Compounds by EPA Method 8260B-Quality Control <br /> Sequoia Analytical-Morgan Hill <br /> Reporting Spike Source %REC RPD <br /> Analyte Result Limit Units Level Result %REC Limits RPD Limit Nates <br /> Batch 4A20011-EPA 5030E P/T <br /> Laboratory Control Sample(4A20011-BSI) Prepared&Analyzed 01/20/04 <br /> Ethylbenzene 11 2 0 50 ug/1 10 0 112 84-132 <br /> Xylenes(total) 33 l 0 50 30 0 110 83-137 <br /> Surrogate 1 2-Dichloroethane-d4 523 3 00 105 78-119 <br /> Laboratory Control Sample(4A20011-BS2) Prepared 01/20/04 Analyzed 01/21/04 _ <br /> Methyl tert-butyl ether 8 89 0 50 ugll 9 92 89 6 63-137 <br /> Benzene 5 50 0 50 6 40 85 9 69 124 <br /> Toluene 33 0 0 50 29 7 111 78 129 <br /> Ethylbenzene 8 19 0 50 6 96 118 84 132 <br /> Xylenes(total) 41 7 0 50 33 7 124 83-137 <br /> Gasoline Range Organics 414 50 440 94 1 70-113 <br /> Surrogate 1 2-Dichloroethane-d4 5 18 500 104 78-129 <br /> Laboratory Control Sample Dup(4A20011-BSD 1) Prepared&Analyzed 01/20/04 <br /> Ethanol 179 100 ug/1 200 89 5 31-143 106 20 <br /> tert-Butyl alcohol 50 7 20 50 0 101 56-131 234 20 <br /> Methyl tert-butyl ether 10 6 0 50 100 106 63-137 0 948 20 <br /> Di-Isopropyl ether 11 2 0 50 10 0 112 76-130 1 80 20 <br /> Ethyl tert-butyl ether 10 9 0 50 10 0 109 81-121 1 82 20 <br /> tert-Amyl methyl ether 10 5 050 100 105 82-140 0 948 20 <br /> 1,2-Dichloroethane 10 9 050 100 109 77-136 000 20 <br /> 1,2-Dibromoethane(EDB) 11 5 0 50 100 115 77-132 2 64 20 <br /> Benzene 10 8 050 100 108 69-124 2 82 20 <br /> Toluene 10 7 050 100 107 78 129 000 20 <br /> Ethylbenzene 11 4 050 10 0 114 84-132 1 77 20 <br /> Xylenes(total) 33 2 0 50 300 111 83-137 0 302 20 <br /> Surrogate 1 2-Dichloroethane-0 5 02 5 00 100 78-119 <br /> Sequoia Analytical-Morgan Hill The results in this report apply to the samples analyzed in accordance with the chain <br /> of custody document Unless otherwise slated results are reported on a wet weight <br /> basis This analytical report must be reproduced in its entirety <br /> Page 13 of 18 <br />