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Dinve <br /> a— ) <br /> 885 Jarvis <br /> Sequoia Morgan Hill CA 95037 5D377 <br /> (408)776 9600 <br /> Analytical FAX(408)782 6309 <br /> www sequoialabs com <br /> Secor-Rancho Cordova(ARCO) Project ARCO#4932,Stockton,CA MNJ0793 <br /> 3017 Kilgore Rd Suite 100 Project Number 63964 Reported <br /> Rancho Cordova CA 95670 Project Manager Rusty Benkosky 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 ttPD <br /> Analyte Result Limn Units Level Result %"REC Limits RPD Limit Notes <br /> Batch 4KO3010-EPA 5030B PIT/EPA 8260B <br /> Blank(4K03010-BLKI) Prepared&Analyzed 11/03/04 <br /> tert-Amyl methyl ether ND 050 ugll <br /> Benzene ND 050 " <br /> tent Butyl alcohol ND 20 " <br /> Di isopropyl ether ND 050 " <br /> 1,2-Dibromoethane(EDB) ND 050 " <br /> 1,2-Dichloroethane ND 050 " <br /> Ethanol ND 100 IC <br /> Ethyl tent-butyl ether ND 0 50 " <br /> Ethylbenzene ND 050 " <br /> Methyl tent-butyl ether ND 050 " <br /> Toluene ND 050 " <br /> Waylenes(total) ND 0 50 , <br /> solme Range Organics(C4-C 12) ND 50 <br /> Surrogate 1 2-Dichloroethane-d4 4 77 5 00 95 78-129 <br /> Laboratory Control Sample(4K03010-BSI) Prepared&Analyzed 11/03/04 <br /> tert-Amyl methyl ether 899 0 50 ug/1 100 90 82-140 <br /> Benzene 940 0 50 " 10 0 94 69-124 <br /> tert-Butyl alcohol SID 20 Soo 102 56-131 <br /> Di-isopropyl ether 985 050 100 98 76-130 <br /> 1 2-Dibromoethane(EDB) 945 050 ]Do 94 77-132 <br /> 1,2-Dichloroethane 997 0 50 100 100 77-136 <br /> Ethanol 198 100 200 99 31-143 IC <br /> Ethyl tert-butyl ether 978 050 100 98 81-121 <br /> Ethylbenzene 907 050 100 91 84-132 <br /> Methyl tert butyl ether 940 050 ]Do 94 63-137 <br /> Toluene 927 050 ]Do 93 78-129 <br /> Xylenes(total) 307 050 300 102 83-137 <br /> Surrogate 1 2-Dichloroethane-d4 4 72 500 94 78-129 <br /> Sequoia Analytical -Morgan Hill The results in this report apply to the samples analyzed in accordance with the chant of <br /> custody document Unless otherwise stated results are reported on a wet weight basis <br /> 0 This analytical report must be reproduced in its entirety <br /> Page l5 of 22 <br />