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ve <br /> Sequoia 885te A 5037 <br /> Morgan Hill CA 95437 <br /> (408)776 9600 <br /> FAX 782 5306 <br /> Analytical www sequoicquo�alahs coin <br /> Secor-Rancho Cordova(ARCO) Project ARCO 42133,Rancho Cordova,CA MNI0853 <br /> 3017 Kilgore Rd Suite 100 Project Number Arca 42133,Racho Cordova,CA Reported <br /> Rancho Cordova CA,95670 Project Manager Rusty Benkosky 10/06/04 15 53 <br /> Volatile Organic Compounds by EPA Method 8260B - Quality Control <br /> Sequoia Analytical -Morgan Hill <br /> Reporting Spike Source %R8C RPD <br /> Analyte Result limit Units Level Result %REC Limits RPD Limit Notes <br /> Batch 4JO5002-EPA 5030B PIT <br /> Matrix Spike(4J05002-MSI) Source MN10712-01 Prepared&Analyzed 10/05/04 <br /> Benzene 11 6 1 0 ugll 12 8 1 5 79 69-124 <br /> Ethylbenzene 15 8 10 15 0 0 18 104 84-132 <br /> Methyl tert-butyl ether 170 1 0 198 140 152 63-137 BB LM <br /> Toluene61 4 10 63 8 020 96 78-129 <br />- - Xylenes(total) - - - -— - -74 9 1 0 73 1 ND 102 83-137 - - - - <br />.Gasoline Range Organics(C4TC12) 928100— -880-150-88-70m]24 <br /> Surrogate 1 2-Dichloroethane-d4 5 13 5 00 103 78-129 <br /> Matrix Spike Dup(4J05002--MSD1) Source MN10712:01 Prepared&Analyzed_10105l04 <br /> Benzene 109 10 ug/l 128 1 5 73 69-124 6 20 <br /> Ethylbenzene 160 10 150 0 18 105 84-132 1 20 <br /> Methyl tert-butyl ether 167 10 198 140 136 63-137 2 20 <br /> Toluene 670 1 0 63 8 020 105 78-129 9 20 <br /> Xylenes(total) 80 1 1 0 73 1 ND 110 83-137 7 20 <br /> Gasoline Range Organics(C4-C 12) 1010 100 880 150 98 70-124 8 20 <br /> Surrogate 1 2-Dichloroethane-d4 507 5 00 101 78-129 <br /> Sequoia Analytical-Morgan Hili 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 14 of 15 <br />