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885 Jarvis Drive <br /> Sequoia Morgan Hill CA 95037 <br /> AA (408)776 9600 <br /> nalytical FAX(408)782 6308 <br /> www sequoialalis coin <br /> Secor-Rancho Cordova(ARCO) Project ARCO#2133,Rancho Cordova,CA MNC0535 <br /> 3017 Kilgore Rd Suite 100 Project Number N/P Reported <br /> Rancho Cordova CA,95670 Project Manager Rusty Benkosky 04/05/04 16 18 <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 Notes <br /> Batch 4C20001-EPA 5030B PIT <br /> Laboratory Control Sample 4C20001-BS2) Prepared&Analyzed 03/20/04 <br /> Gasoline Range Organics(C6-C10) 364 50 ugil 440 82 7 70-124 <br /> Surrogate 1 2-Dichloroethane-d4 527 5 00 105 78-129 <br /> Laboratory Control Sample_Dug(4C20001-BSD1) Prepared 03/20/04 Analyzed 03/21/04 - <br /> Ethanol 230 100 ug/l 200 115 31-143 13 5 20 CC04 <br /> tert-Butyl alcohol 463 20 50 0 92 6 56-131 2 98 20 <br /> Methyl ter(-butyl ether 102 0 50 10 0 102 63-137 1 94 20 <br /> Di-isopropyl ether 8 03 0 50 10 0 803 76-130 5 57 20 <br /> Ethyl tert-butyl ether 9 63 0 50 10 0 963 81-121 2 97 20 <br /> tert Amyl methyl ether 9 81 050 100 98 1 82-140 3 90 20 <br /> 1 2-Dichloroethane 11 0 050 100 110 77-136 0 905 20 <br /> 1 2-Dibromoethane(EDB) 10 6 050 100 106 77-132 6 39 20 <br /> enzene 8 80 050 ii 100 88 0 69-124 5 85 20 <br /> Toluene 925 050 100 92 5 78-129 6 59 20 <br /> Ethylbenzene 9 18 0 50 10 0 91 8 84-132 5 41 20 <br /> Xylenes(total) 280 0 50 30 0 93 3 83-137 4 20 20 <br /> Surrogate 12-Drchloroethane-d4 536 500 107 78-129 <br /> Laboratory Control Sample Da (4020001-BSD2) Prepared 03/20/04 Analyzed 03/21/04 <br /> Gasoline Range Organics(C6-C 10) 326 50 ug/l 440 74 1 70-124 11 0 20 <br /> Surrogate 12-Dichloroethane-d4 5 39 500 108 78-129 <br /> Matrix Spike 4C20001-MS1 Source MNC0560-03 Prepared&Analyzed 03/20/04 <br /> Methyl tert-butyl ether 2060 25 ug/l 500 1600 920 63-137 QM04 <br /> Benzene 453 25 500 ND 906 69-124 <br /> Toluene 480 25 500 ND 96 0 78-129 <br /> Ethylbenzene 476 25 500 ND 95 2 84-132 <br /> Xylenes(total) 1440 25 1500 ND 960 83-137 <br /> Surrogate 12-Dichloroethane d4 5 30 500 106 78-129 <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 stated results are reported on a wet weight <br /> basis This analytical report must he reproduced to its entirety <br /> Page 17 of 21 <br />