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865 Jarvis Dr <br /> Hill,Sequoia Morgan(408 95637 <br /> a— ) <br /> )7777 6-9666 <br /> Analytical FAX(468)782 630$ <br /> www sequinalabs can <br /> Stratus Environmental Inc Project ARCO#2168 MLK0507 <br /> 3330 Cameron Park Dr,Suite 550 Project Number ARCO#2168,Stockton,CA Reported <br /> Cameron Park CA,95682 Project Manager Jay Johnson 12/20/02 07 53 <br /> Volatile Organic Compounds by EPA Metbod 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 2K26008-EPA 5035 <br /> Laboratory Control Sample Dup(2K26008-BSDI) Prepared 11/26/02 Analyzed 11/27/02 <br /> Methyl tert-butyl ether ]is 050 ug/1 100 118 63-137 47 1 13 QR-02 <br /> Benzene 102 050 100 102 78-124 258 12 <br /> Toluene 106 050 100 106 78-129 180 10 QR-02 <br /> Surrogate 11-Dichloroethane-d4 481 500 961 78-129 <br /> Laboratory Control Sample Dup(2K26008-BSD2) Prepared 11/26/02 Analyzed 11/27/02 <br /> Methyl tert-butyl ether 822 050 ug/1 840 979 63-137 157 13 <br /> Benzene 457 050 528 866 78-124 152 12 <br /> Toluene 330 050 318 104 78-129 444 10 <br /> Gasoline Range Organics(C6-C10) 412 50 440 936 70-113 574 9 <br /> W,rog-1. hloroethmi 12-Dice-d4 459 " 500 91 8 78-119 <br /> Batch 2K27002-EPA 5035 <br /> Blank(2K27002-BLKI) Prepared&Analyzed 11/27/02 <br /> Ethanol ND 40 u8/1 <br /> tert-Butyl alcohol ND 20 0-09 <br /> Methyl tert-butyl ether ND 050 " <br /> Di-isopropyl ether ND 050 " <br /> Ethyl tent-butyl ether ND 050 " <br /> tent-Amyl methyl ether ND 050 0-09 <br /> 1,2-Dichloroethane ND 050 " <br /> 1,2-abromoethane(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 11-Dichloroethane-d4 483 500 966 78-119 <br /> equoia 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 as entirety <br /> 10 of 12 <br />