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885 Jarvis Dr <br /> Morgan CA 95037 <br /> / ` ` Sequoia (408)7769600 <br /> *W0Analytical wFAX{408)7826308 <br /> ww sequoialabs com <br /> Secor-Rancho Cordova(ARCO) Project ARCO#0595,Stockton,CA MNG0109 <br /> 3017 Kilgore Rd Suite 100 Project Number 62546 Reported <br /> Rancho Cordova CA,95670 Project Manager Rusty Benkosky 07/20/04 20 24 <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 Limas RPD Limit Notes <br /> Batch 4G15001 -EPA 5030B PIT <br /> Laboratory Control Sample Dup(4G15001-BSD2) Prepared&Analyzed 07/15/04 <br /> Benzene 5 12 050 ug/l 640 80 69-124 5 20 <br /> Ethylbenzene 778 050 696 112 84-132 6 20 <br /> Methyl tert-butyl ether 809 050 992 82 63-137 3 20 <br /> Toluene 330 050 297 111 78-129 6 20 <br /> Xylenes(total) 389 050 337 115 83-137 4 20 <br /> Gasoline Range Organics(C4-C12) 395 50 440 90 70-124 5 20 <br /> Surrogate 12-Dichloroerhane-d4 494 500 99 78-129 <br /> Matrix Spike(4G15001-MS1) Source MNG0109-13REI Prepared&Analyzed 07/15/04 <br /> Bene 104 to ugll 128 ND 81 69-124 <br /> Ethylbenzene 15 1 10 " 139 ND 109 84-132 <br /> ethyl tert-butyl ether 158 10 198 ND 80 63-137 <br /> Toluene 664 10 " 594 ND 112 78-129 <br /> Xylenes(total) 749 10 " 674 ND 111 83-137 <br /> Gasoline Range Organics(C4-C12) 690 100 880 ND 78 70-124 <br /> Swrogate 1,2-Dtch1oroethane-d4 517 500 103 78-129 <br /> Matnx Spike Dup(4G15001-MSDI) Source MNG0109-1311EI Prepared&Analyzed 07/15/04 <br /> Benzene 116 10 ug/1 128 ND 91 69-124 11 20 <br /> Ethylbenzene 158 10 13 9 ND 114 84-132 5 20 <br /> Methyl tert-butyl ether 152 10 19 8 ND 77 63-137 4 20 <br /> Toluene 680 10 594 ND 114 78-129 2 20 <br /> Xylenes(total) 770 1 0 674 ND 114 83-137 3 20 <br /> Gasoline Range Organics(C4-C12) 739 100 " 880 ND 84 70-124 7 20 <br /> Swmgate 1,2-Drchloroethane-d4 4 79 500 96 78-119 <br /> Batch 4G16005-EPA 5030B PIT <br /> Blank(4G16005-BLKI) Prepared&Analyzed 07/16/04 <br /> tert Amyl methyl ether ND 050 ug/1 <br /> Benzene ND 050 " <br /> tent-Butyl alcohol ND 5 0 " <br /> Di-isopropyl ether ND 050 " <br /> 1,2 Dibromoethane(EDB) ND 050 " <br /> 1,2-Dichloroethane ND 050 " <br /> Ethanol ND 100 " <br /> Ethyl tert-butyl ether ND 050 " <br /> Sequoia Analytical-Morgan Hill The results rn this report apply to the samples analyzed rn accordance with the chain of <br /> custody document Unless otherwtse slated results are reported on a wet weight basis <br /> Thts analytical report nrust be reproduced in its entirety <br /> Page 17 of 21 <br />