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885 Jar%is Dr <br /> Sequoia Morgan Hill CA 95037 <br /> (i) (408)776 9600 <br /> FAX(408)782 6308 <br /> Analytical www sequoialnbs com <br /> Secor-Rancho Cordova(ARCO) Project ARCO#0595,Stockton, CA NIN60109 <br /> 3017 Kilgore Rd Suite 100 Project Number 62546 Reported <br /> Rancho Cordova CA,95670 Project Manager Rusty 13enkosky 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 /> Result Limit Units Level Result %REC Limits R.PD Limit Notes <br /> Batch 4G15001 -EPA 5030B P/T <br /> Laboratory Control Sample(4G15001-BS1) Prepared&Analyzed 07/15104 <br /> Toluene 114 050 UgA 100 114 78-129 <br /> Xylenes(total) 332 050 300 111 83-137 <br /> Surrogate I 2-Dichloroethane-& 499 500 100 78-129 <br /> Labo rato ry Control Samp le(4G 15001-BS2) Prepared&Analyzed 07115/04 <br /> Benzene 536 050 U911 640 94 69-124 <br /> Ethylbenzcne 826 050 696 119 84-132 <br /> Methyl tcrt-butyl ether 836 050 992 84 63-137 <br /> Toluene 350 050 297 Its 78-129 <br /> Xylenes(total) 406 050 337 120 83-137 <br /> .,,-Gasoline Range Organics(C4-C 12) 416 so 440 95 70-124 <br /> 1�gare I 2-Dichloroethane-& 505 500 101 78-129 <br /> Laboratory Control Sample Dup(4GI5001-BSDI) Prepared&Analyzed 07115/04 <br /> tert-Amyl methyl ether 105 050 ugf] 100 105 92-140 6 20 <br /> Benzene 923 050 100 92 69-124 13 20 <br /> tert-Butyl alcohol 516 50 500 103 56-131 2 20 <br /> Di-isopropyl ether 107 050 100 107 76-130 6 20 <br /> 1,2-Dibromoethane(EDB) 959 050 too 96 77-132 5 20 <br /> 1,2-Dichloroethane 9 16 050 100 92 77-136 10 20 <br /> Ethanol 207 too 200 104 31-143 3 20 <br /> Ethyl tert-butyl ether 107 050 100 107 91-121 8 20 <br /> Ethyibenzene 998 050 100 100 84-132 11 20 <br /> Methyl tert-butyl ether 956 050 100 96 63-137 4 20 <br /> Toluene 982 050 100 98 78-129 15 20 <br /> Xylenes(total) 29 1 050 300 97 83-137 13 20 <br /> Surrogate I 2-Dichloroethane-d4 509 500 102 78-129 <br /> Sequoia Analytical - Morgan Hill The results in this report apply to the samples analyzed m 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 16 of 21 <br />