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izSequoia 885 Jarvis Drive <br /> _ Morgan Hill,CA 95037 <br /> � Analytical (408)7769600 <br /> ww equoi labs c 08 <br /> www aequoialaba com <br /> Secor-Rancho Cordova(ARCO) Project ARCO#4932,Stockton,CA MNJ0793 <br /> 3017 Kilgore Rd Suite 100 Project Number 63964 <br /> 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 RPD <br /> IA.alyte Result Limit Units Level Result %REC Limits RPD limit Notes <br /> Batch 4KO4005-EPA 5030B PIT/EPA 82608 <br /> Matrix Spike(4K04005-MSI) Source MNJ0793-06 Prepared&Analyzed 11/04/04 <br /> Berne 1090 100 ug/l 1280 ND 85 69-124 <br /> Ethylbenzene 1710 100 1500 ND 114 84-132 <br /> Methyl tent-butyl ether 16800 100 1980 16000 40 63-137 gg <br /> Toluene 6440 100 6380 ND 101 78-129 <br /> LN <br /> Xylenes(total) 8000 100 7310 ND 109 83-137 <br /> Gasoline Range Organics(C4-Cl 2) 86400 10000 88000 8t00 89 70-124 <br /> Surrogate 1 1-Dtchloroethane d4 l I8 ISO 87 78-129 <br /> Matrix Spike Dup(4K04005-MSDI) Source MNJO793-06 Prepared 11/04/04 Analyzed 11/05/04 <br /> Bene 1150 100 ugA 1280 ND 90 69-124 5 20 <br /> Ethylbenzene " <br /> 1710 100 1500 ND 114 84-132 0 20 <br /> Methyl tent-butyl ether 17100 100 1980 16000 56 63-137 2 20 <br /> BB,LN <br /> Toluene 6640 100 6380 ND 104 78-I29 3 20 <br /> Xylanes(total) 8350 100 7310 ND 114 83-137 4 20 <br /> Gasoline Range Organics(C4 CI 2) 90300 10000 88000 8100 93 70 124 4 20 <br /> Surrogate I1-Dlchloroethane-d4 109 150 84 78-119 <br /> Batch 4KO5015-EPA 5030B PIT I EPA 8260B <br /> Blank 4K05015-BLK1) Prepared&A alyWd 11/05/04 <br /> tert-Amyt methyl ether ND 050 ugA <br /> Benzene ND 050 " <br /> tort-Butyl alcohol ND 20 " <br /> Di-tsopropyl ether ND 050 " <br /> 1,2-Dibromoethane(EDB) ND 050 <br /> 1,2-Dichlomethone ND 050 " <br /> Ethanol ND 100 " <br /> Ethyl tert-butyl ether ND 050 " <br /> Ethylbenzene ND 050 <br /> Methyl tert-butyl ether ND 050 <br /> Toluene ND 050 " <br /> Xylenes(total) ND 050 " <br /> Gasoline Range Organics(C4-C12) ND 50 " <br /> Surrogate I 1-Drchloroethane-d4 365 " 500 73 78-129 LG <br /> Sequoia Analytical-Morgan Hili 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 /> ,i This analytical report must be reproduced in Its entirety <br /> Page 19 of 22 <br />