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885 Jarvis Dr <br /> Sequoia Morgan C9 <br /> (40 <br /> �"►I�� (408)7776-96009600 <br /> FAX(408)782-6308 <br /> Analytical www sequotalabs com <br /> Secor-Rancho Cordova(ARCO) Project ARCO#4932,Stockton,CA MNG0370 <br /> 3017 Kilgore Rd Suite 100 Project Number 63964 Reported <br /> Rancho Cordova CA,95670 Project Manager Rusty Benkosky 07/20/04 09 33 <br /> Volatile Organic Compounds by EPA Method 8260B- Quality Control <br /> Sequoia Analytical-Morgan Hill <br /> Reporting Spike Source %REC RPD <br /> Analyte Result Unlit Units Level Result %REC Ltm115 RPD IAnut Notes <br /> Batch 4G19006-EPA 5030B PIT <br /> Laboratory Control Sample(4G19006-BSI) Prepared&Analyzed 07/19/04 <br /> Toluene 960 050 ugll 100 96 78-129 <br /> Xylenes(total) 32 3 050 300 108 83-137 <br /> Surrogate 1 1-Dichloroethane-d4 518 500 106 78-129 <br /> Laboratory Control Sample(4G19006-BS2) Prepared&Analyzed 07/19/04 <br /> Benzene 560 050 ugll 640 88 69-124 <br /> Ethylbenzene 807 050 696 116 84-132 <br /> Methyl tert butyl ether 846 050 992 85 63 137 <br /> Toluene 319 050 297 107 78-129 <br /> Xylenes(total) 403 050 337 120 83-137 <br /> Gasoline Range Organics(C4 C12) 475 50 440 108 70-124 <br /> Surrogate 1 1-Dichloroethane-d4 493 300 99 78 129 <br /> Laboratory Control Sample Dup(4G19006-BSDI) Prepared&Analyzed 07/19/04 <br /> tent Amyl methyl ether 916 050 ugll 100 92 82-140 3 20 <br /> Benzene 965 050 Wo 96 69-124 8 20 <br /> tert-Butyl alcohol 523 20 500 105 56-131 2 20 <br /> Di-isopropyl ether 10 7 050 100 107 76-130 0 20 <br /> 1,2 Dibromoethane(EDB) 11 3 050 100 113 77-132 0 20 <br /> 1 2-Dichloroethane 108 050 100 108 77-136 0 20 <br /> Ethanol 212 100 200 106 31-143 5 20 <br /> Ethyl tent butyl ether 966 050 100 97 81-121 3 20 <br /> Ethylbenzene 107 050 100 107 84-132 4 20 <br /> Methyl tert butyl ether 881 050 100 88 63 137 4 20 <br /> Toluene 992 050 100 99 78-129 3 20 <br /> Xylenes(total) 32 9 050 300 110 83-137 2 20 <br /> Surrogate 1 2-Drchloroethanc-d4 4 71 500 94 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 stated results are reported on a wet weight basis <br /> This analytical report must be reproduced in its entirety <br /> Page 8 of 11 <br />