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885ants Drive <br /> Sequoia Morgan Hill1 CA 95037 <br /> i (44$)776-964G <br /> Analytical FAX( 782-6308 <br /> www sequoquoialabs com <br /> Secor-Rancho Cordova(ARCO) Project ARCO#4932,Stockton,CA MNG0371 <br /> 3017 Kilgore Rd Suite 100 Project Number 63964 Reported <br /> Rancho Cordova CA,95670 Project Manager Rusty Benkosky 08/03/04 16 21 <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 Umts Level Result %REC Limits RPD limit Notes <br /> Batch 4G28006-EPA 5030B PIT <br /> Laboratory Control Sample(4G28006-BS1) Prepared&Analyzed 07/28/04 <br /> tert-Amyl methyl ether 9 16 050 ug/l 100 92 82-140 <br /> Benzene 953 050 loo 95 69-124 <br /> tert Butyl alcohol 50 0 20 500 100 56-131 <br /> Dt isopropyl ether 107 050 100 107 76-130 <br /> 1,2-Dtbromoethane(EDB) 106 050 100 106 77-132 <br /> 1,2-Drchloroethane 10 2 050 100 102 77-136 <br /> Ethanol 233 100 200 116 31-143 <br /> Ethyl tent butyl ether 926 050 100 93 81-121 <br /> Ethylbenzene 10 2 0 50 100 102 84-132 <br /> Methyl ten-butyl ether 767 050 100 77 63-137 <br /> Toluene 969 0 50 100 97 78-129 <br /> AdkIylenes(total) 32 1 050 " 300 107 83-137 <br /> Surrogate 1 2-Drchloroethane d4 511 500 102 78-129 <br /> Laboratory Control Sample(4G28006-BS2) Prepared&Analyzed 07/28/04 <br /> Benzene 5 15 0 50 ug/l 640 80 69-124 <br /> Ethylberimne 756 050 696 109 84 132 <br /> Methyl tert-butyl ether 794 050 992 80 63-137 <br /> Toluene 298 050 297 100 78-129 <br /> Xylenes(total) 385 050 33 7 114 83-137 <br /> Gasoline Range Organics(C4-C12) 441 50 440 100 70-124 <br /> Surrogate 1 2-Drchloroethane d4 519 500 104 78-119 <br /> Laboratory Control Sample Dup(4G28006-BSDI) Prepared&Analyzed 07/28/04 <br /> tert-Amyl methyl ether 935 050 ug/l 100 94 82-140 2 20 <br /> Benzene 935 0 50 100 94 69-124 2 20 <br /> tert Butyl alcohol 49 4 20 500 99 56-131 1 20 <br /> Di-isopropyl ether 10 6 050 100 106 76 130 09 20 <br /> 1,2-Dtbromoethane(EDB) 108 050 100 108 77-132 2 20 <br /> 1,2-Dichloroethane 9 93 050 100 99 77-136 3 20 <br /> Ethanol 213 100 200 106 31-143 9 20 <br /> Ethyl tert butyl ether 92.2 0 50 100 92 81 121 0 4 20 <br /> Ethylbenzene 990 0 50 100 99 84-132 3 20 <br /> Methyl Cert-butyl ether 8 17 0 50 too 82 63-137 6 20 <br /> Toluene 9 16 0 50 100 92 78-129 6 20 <br /> Xylenes(total) 302 0 50 300 lot 83 137 6 20 <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 werghl basis <br /> This analytical report must be reproduced in its entirety <br /> Page 22 of 24 <br />