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W <br /> 1 W <br /> 885 Jarvis Drive <br /> (D— Sequoia Morgan Hill,CA 95037 <br /> (408)776-9600 <br /> Analytical FAX(408)7826308 <br /> www sequoialabacom <br /> Secor-Rancho Cordova(ARCO) Project ARCO#595,Stockton,CA MMJ0263 <br /> 3017 Kilgore Rd Suite 100 Project Number 38983 Reported <br /> Rancho Cordova CA,95670 Project Manager Rusty Benkosky 11/06/03 15 47 <br /> Volatile Organic Compounds by EPA Method 8260B - Quality Control <br /> Sequoia Analytical- Morgan H111 <br /> Reporting Spike Source %REC RPD <br /> Anatyte Result Latin Units Level Result %REC Lunits RPD Limit Notes <br /> Batch 3J16005-EPA 5030B PIT <br /> Laboratory Control Sample(3J16005-BS2) Prepared&Analyzed 10/16/03 <br /> Gasoline Range Organics(C6-C10) 423 50 ug/l 440 96 1 70-113 <br /> Methyl tert-butyl ether 8 14 050 101 806 63-137 <br /> Benzene 545 050 648 841 78-124 <br /> Toluene 333 050 297 112 78-129 <br /> Ethylbenzene 7 11 050 720 98 8 84-117 <br /> Xylenes(total) 388 050 337 115 83-125 <br /> Gasoline Range Organics 423 50 440 961 70-113 <br /> Surrogate 1,2-Dichloroethane-d4 542 .500 108 78-129 <br /> Laboratory Control Sample Du (3J16005-BSDI) Prepared 10/16/03 Analyzed 10/17/03 <br /> Ethanol 207 100 ug/l 200 104 31-186 546 37 <br /> tert-Butyl alcohol 506 20 500 101 0-206 11 7 22 <br /> ethyl tert-butyl ether 759 050 " 100 759 63-137 1 05 13 <br /> Diasopropyl ether 805 050 100 805 76-130 2 13 9 <br /> Ethyl tert-butyl ether 796 050 " 100 796 61-141 0 626 9 <br /> tent-Amyl methyl ether 790 050 100 790 56-140 0 757 12 <br /> 1,2-Dichloroethane 107 050 100 107 77-136 909 13 <br /> 1,2-Dibromoethane(EDB) 109 050 100 109 77-132 185 9 <br /> Benzene 8 53 050 100 853 78-124 1 18 12 <br /> Toluene 907 050 100 907 78-129 0 664 10 <br /> Ethylbenzene 947 050 10 0 94 7 84-117 0 527 10 <br /> Xylenes(total) 328 050 300 109 83-125 500 11 <br /> Surrogate 12-Dichloroethane-d4 527 5 00 105 78-129 <br /> Laboratory Control Sample Dup(3J16005-BSD2) Prepared 10/16/03 Analyzed 10/17/03 <br /> Methyl tert-butyl ether 796 050 ug/l 101 788 63-137 224 13 <br /> Benzene 569 050 648 87 8 78-124 431 12 <br /> Toluene 344 050 29 7 116 78-129 3 25 10 <br /> Ethylbenzene 7 18 050 720 99 7 84-117 0 980 10 <br /> Xylenes(total) 393 050 33 7 117 83-125 128 11 <br /> Gasoline Range Organics 418 50 440 950 70-113 1 19 9 <br /> Surrogate 1,2-Dichloroethane-d4 567 500 113 78-129 <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 slated results are reported on a wet weight basis <br /> This analytrcal report must be reproduced in as entirety <br /> 11 of 16 <br /> I <br />