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a— ) <br /> Sequoia 9Hi Ja A95me <br /> Morgan Hill CA 95037 <br /> (408)776%00 <br /> Analytical FAX(408)792.6308 <br /> WWW sequoialabs co <br /> Secor-Rancho Cordova(ARCO) Project ARCO 44932,Stockton,CA MN30793 <br /> 3017 Kilgore Rd Suite 100 Project Number 63964 Reported <br /> Rancho Cordova CA,95670 Project Manager Rusty Benkasky 11/12/04 12 23 <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 Limit Notes <br /> Batch 4KO4005-EPA 5030B Pn'/EPA 8260B <br /> Laboratory Control Sample(4K04005-BS1) Prepared&Analyzed 11/04/04 <br /> Toluene 107 050 ugll I0 0 107 78-129 <br /> Xylenes(total) 334 050 300 111 83-137 <br /> Surrogate 1 2-Dichloroethane-d4 215 250 86 78-129 <br /> Laboratory Control Sample(4K04005-BS2) Prepared&Analyzed 11/04/04 <br /> Benzene 546 0 50 ugll 640 85 69-124 <br /> Ethylbenzene 8 24 0 50 752 110 84-132 <br /> Methyl tert-butyl ether 10 4 050 992 105 63-137 <br /> Toluene 316 050 319 99 78-129 <br /> Xylenes(total) 394 050 366 108 83-137 <br /> Gasolme Range Organics(C4-C 12) 410 50 440 93 70-124 <br /> Surrogate 1 2-Dichloroethane-d4 215 250 86 78-119 <br /> Laboratory Control Sample Dup(4K04005-BSD1) Prepared&Analyzed 11/04/04 <br /> tert Amyl methyl ether 10 4 0 50 ug/1 10 0 104 82-140 6 20 <br /> Benzene 100 050 100 100 69-124 3 20 <br /> tert Butyl alcohol 559 20 " 500 112 56-131 l0 20 <br /> Di-isopropyl ether 110 050 10 0 110 76-130 3 20 <br /> 1,2-Dibromoedme(EDB) 101 050 100 101 77-132 3 20 <br /> 1,2-Dichloroethane 942 050 100 94 77-136 0 1 20 <br /> Ethanol 205 100 200 102 31-143 8 20 <br /> Ethyl tert-butyl ether 116 050 10 0 116 81-121 4 20 PE <br /> Ethylbenzene 110 050 l0 0 110 84-132 4 20 <br /> Methyl tert-butyl ether 10 6 050 10 0 106 63-137 9 20 <br /> Toluene 10 1 050 10 0 101 78-129 6 20 <br /> Xylenes(total) 32 4 0 50 300 108 83-137 3 20 <br /> Surrogate 1 1-Drchloroethane-d4 199 250 80 78-129 <br /> Sequoia Analytical-Morgan Hi I I The results to 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 entirely <br /> Page 18 of 22 <br />