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Drive <br /> Sequoia 8Hi Jarvis 5037 <br /> Morgan Hill CA 95037 <br /> (408)776 9600 <br /> Analytical FAX equoi labs cam www scquoialabs 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 Units Level Result "/REC Limits RPD Limn Notes <br /> Batch 4G28006-EPA 5030B PIT <br /> Laboratory Control Sample(4G28006-BSI) Prepared&Analyzed 07/28/04 <br /> cert-Amyl methyl ether 9 16 050 ug/1 100 92 82-140 <br /> Benzene 9 53 0 50 100 95 69-124 <br /> tent-Butyl alcohol 500 20 50 0 100 56-131 <br /> Di-isopropyl ether 107 0 50 10 0 107 76-130 <br /> 1,2-Dibromoethane(EDB) 106 050 10 0 106 77-132 <br /> 1,2-Dichloroethane 102 0 50 10 0 102 77-136 <br /> Ethanol 233 100 200 116 31-143 <br /> Ethyl tert-butyl ether 9 26 0 50 10 0 93 81-121 <br /> Ethylbenzene 102 050 10 0 102 84-132 <br /> Methyl tert-butyl ether 7 67 050 10 0 77 63-137 <br /> Toluene 969 050 10 0 97 78-129 <br /> Aft, 1----s(total) 32 1 050 30 0 107 83-137 <br /> Surrogate 12-Drchloroethane-d4 5 11 5 00 101 78-129 <br /> Laboratory Control Sample(4G28006-BS2) Prepared&Analyzed 07/28/04 <br /> Benzene 5 15 050 ug/l 640 80 69-124 <br /> Ethylbenzene 7 56 050 696 109 84-132 <br /> Methyl cert-butyl ether 794 050 992 80 63-137 <br /> Toluene 298 050 29 7 100 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 1,1-Drchloroethane-d4 S 19 500 104 78-129 <br /> Laboratory Control Sample Dup(4G28006-BSDI) Prepared&Analyzed 07/28/04 <br /> tert-Amyl methyl ether 935 050 ugll 100 94 82-140 2 20 <br /> Benzene 935 0 50 100 94 69-124 2 20 <br /> tert-Butyl alcohol 494 20 500 99 56-131 1 20 <br /> Di-isopropyl ether 10 6 050 10 0 106 76-130 0 9 20 <br /> 1,2-Dibromoethane(EDB) 1118 0 50 10 0 108 77-132 2 20 <br /> 1,2-Dichloruethane 993 0 50 10 0 99 77-136 3 20 <br /> Ethanol 213 100 200 106 31-143 9 20 <br /> Ethyl cert-butyl ether 922 050 10 0 92 81-121 0 4 20 <br /> Ethylbenzene 9 90 050 100 99 84-132 3 20 <br /> Methyl tert-butyl ether 8 17 050 10 0 82 63-137 6 20 <br /> Toluene 9 16 0 50 100 92 76-129 6 20 <br /> Xylenes(total) 302 050 300 101 83-137 5 20 <br /> 4Vequoia <br /> .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 he reproduced in its entirety <br /> Page 22 of 24 <br />