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885 Jarvis Drive <br /> Sen uoia Morgan Hill 7695037 <br /> �l (408)766 4600 <br /> Analytical www <br /> (408)782-6308 <br /> sequoalabscom <br /> Secor-Rancho Cordova(ARCO) Project ARCO#595,Stockton,CA MMG0658 <br /> 3017 Kilgore Rd Suite 100 Project Number 38983 Reported <br /> Rancho Cordova CA,95670 Project Manager Rusty Benkosky 08/12/03 18 03 <br /> Volatile Organic Compounds by EPA Method 8260B- Quality Control <br /> Sequoia Analytical- Morgan Hill <br /> Reporting Spike Source %REC RPD <br /> Analyte Result Lunt Ilmts Level Result %REC Limits RPD Limit Notes <br /> Batch 3HOS021 -EPA 5030B PIT <br /> Blank(3H05021-BLKI) Prepared&Analyzed 08/05/03 <br /> Ethanol ND 100 ug/l <br /> tert-Butyl alcohol ND 20 <br /> Methyl tert-butyl ether ND 050 " <br /> Di-isopropyl ether ND 050 " <br /> Ethyl tert-butyl ether ND 050 " <br /> tert-Amyl methyl ether ND 050 " <br /> 1,2-Dtchloroethane ND 050 " <br /> 1,2-Dibromoethane(EDB) ND 050 " <br /> Benzene ND 050 " <br /> Toluene ND 050 " <br /> Ethylbenzene ND 050 " <br /> .Xylenes(total) ND 050 <br /> Gasoline Range Organics(C6-C 10) ND 50 <br /> Surrogate 1 1-Dtchloroethane-d4 534 500 107 78-129 <br /> Laboratory Control Sample(31105021-BS1) Prepared&Analyzed 08/05/03 <br /> Methyl tert-butyl ether 123 050 ugll 100 123 63-137 <br /> Benzene 109 050 100 109 78-124 <br /> Toluene 104 050 100 104 78-129 <br /> Surrogate 1 1-Dichloroethane d4 517 500 105 78-129 <br /> Laboratory Control Sample(3H05021-BS2) Prepared&Analyzed 08/05/03 <br /> Methyl tert-butyl ether 895 050 ugfl 992 902 63-137 <br /> Benzene 5 13 050 640 802 78-124 <br /> Toluene 298 050 297 100 78-129 <br /> Gasoline Range Organics(C6-C10) 417 50 440 948 70-113 <br /> Surrogate 1 2-Dechloroethane-d4 529 500 106 78-129 <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 weight basis <br /> This analytical report must be reproduced in its entirety <br /> 17 of 19 <br />