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Sequoia 885 Jarvis Drive <br /> Morgan Hill CA 95037 <br /> (408)776 9600 <br /> mW Analytical FAX(408)782 6308 <br /> 0 www sequoialabs com <br /> Secor- Rancho Cordova(ARCO) Project ARCO#2133,Rancho Cordova,CA MNP0734 <br /> 3017 Kilgore Rd Suite 100 Project Number N/P Reported <br /> Rancho Cordova CA,95670 Project Manager Rusty Benkosky 07/10/04 11 18 <br /> Volatile Organic Compounds by EPA Method 8260B - Quality Control <br /> Sequoia Analytical - Morgan Hill <br /> Reporting Spike Source "/OPEC RPD <br /> Analyte Result Limit /Units Level Result %REC Limits RPD Limit Notes <br /> Batch 4GO2003- EPA 5030B P/T <br /> Laboratory Control Sample(4G02003-BS2) Prepared&Analyzed 07/02/04 <br /> Benzene 5 37 050 ugll 640 84 69-124 <br /> Ethylbenzene 797 050 696 ]is 84-132 <br /> Methyl tert-butyl ether 980 0 50 992 99 63-137 <br /> Toluene 344 050 297 116 78-129 <br /> Xylenes(total) 387 050 33 7 115 83-137 <br /> Gasoline Range Organics(C4-C12) 397 50 440 90 70-124 <br /> Surrogate 12-Dtchloroethane-d4 530 5 00 106 78-129 <br /> Laboratory Control Sample Dup(4G02003-BSD1) Prepared 07/02/04 Analyzed 07/03/04 <br /> tert-Amyl methyl ether 11 1 050 ug/1 100 Ill 82-140 ]8 20 <br /> Benzene 921 050 I O 0 92 69-124 13 20 <br /> tert-Butyl alcohol 468 20 500 94 56-131 1 20 <br /> -10 <br /> isopropyl ether 11 1 0 50 too 111 76 130 11 20 <br /> 2-Dibromoethane(EDB) 103 0 50 100 103 77-132 15 20 <br /> l 2-Dichloroethane 11 1 0 50 100 Ill 77-136 15 20 <br /> Ethanol 148 100 200 74 31-143 2 20 <br /> Ethyl tert-butyl ether 11 7 050 ]0 0 117 81-121 14 20 <br /> Ethylbenzene 947 050 10 0 95 84-132 1 20 <br /> Methyl tert butyl ether 12 3 050 10 0 123 63-137 17 20 <br /> Toluene 10 2 050 10 0 102 78-129 15 20 <br /> Xylenes(total) 29 0 0 50 300 97 83-137 9 20 <br /> Surrogate 12-Dichloroethane-d4 5 91 5 00 118 78-129 <br /> Matrix Spike(4G02003-MS1) Source MNF0628-03 Prepared 07/02/04 Analyzed 07/03/04 <br /> Benzene 305 5 0 ug/1 640 260 70 69 124 <br /> Ethylbenzene 797 5 0 696 4 4 108 84-132 <br /> Methyl tert-butyl ether 400 5 0 992 270 131 63-137 <br /> Toluene 367 5 0 297 4 7 122 78-129 <br /> Xylenes(total) 390 5 0 337 7 4 114 83-137 <br /> Gasoline Range Organics(C4-C]2) 8560 500 4400 4100 101 70-124 <br /> Surrogate 12-Dtchloroethane-d4 574 5 00 115 78-129 <br /> equoia 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 /> Page 9of11 <br />