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� IT <br /> Sequoia 885 Jarvis Dnp <br /> Morgan Hill,CA 45037 <br /> Analytical (409) <br /> (408)766-9600 <br /> FAX(408)786308 <br /> www sequotalabacom <br /> 9 <br /> Secor-Rancho Cordova Project ARCO#4932,Stockton,CA MMG0728 <br /> 3017 Kilgore Rd Suite 100 Project Number Arco#4932,Stockton,CA Reported <br /> Rancho Cordova CA,95670 Project Manager Rusty Benkosky 08/05/03 14 58 <br /> Volatile Organic Compounds by EPA Method 8260B - Quality Control <br /> Sequoia Analytical-Morgan Hill <br /> Reporting Spike Source %REC RFD <br /> Analyte Result I-Mut Units Level Result %REC Limits RPD Lunit Notes <br /> Batch 3H04010-EPA 5030B PIT <br /> Blank(3H04010-BLK1) Prepared&Analyzed 08/04/03 <br /> Ethanol ND 100 ug/l 009 <br /> tert-Butyl alcohol ND 20 A-01 <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-Dichloroethane ND 050 009 <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 C10) ND 50 <br /> Surrogate 1 2-Dichloroethane-d4 547 500 109 78-129 <br /> Laboratory Control Sample(31104010-BSI) Prepared&Analyzed 08/04/03 <br /> Methyl tert-butyl ether 107 050 ug/I 100 107 63-137 <br /> Benzene 880 050 100 880 78-124 <br /> Toluene 901 050 100 90 1 78-129 <br /> Surrogate 1 1-Dichloroethane-d4 581 Soo 116 78-119 <br /> Laboratory Control Sample(3H04010-BS2) Prepared&Analyzed 08/04/03 <br /> Methyl tert-butyl ether 5 10 050 ug/l 496 103 63-137 <br /> Benzene 254 050 3 20 794 78-124 <br /> Toluene 15 1 0 50 148 102 78-129 <br /> Gasoline Range Organics(C6-C 10) 243 50 220 110 70-113 <br /> Surrogate 1 1-Dichloroethane-d4 S 43 500 109 78-119 <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 /> 16 of 18 <br />