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a— ) (4885 Jarvis Dr <br /> Sequoia Mcrgan Hill,CA95037 <br /> 120-9 Analytical FAX <br /> 08)776-9600 <br /> 406 762-6396 <br /> WWW sequoialabs can <br /> Stratus Environmental Inc Project ARCO#2186,Stockton,CA MLL0253 <br /> 3330 Cameron Park Dr,Suite 550 Project Number ARCO#2186,Stockton,CA Reported <br /> Cameron Park CA,95682 Project Manager Jay Johnson 12/20102 09 05 <br /> Volatile Organic Compounds by EPA Method 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 2L15003-EPA 5035 <br /> Laboratory Control Sample Dup(2L15003-BSD1) Prepared 12/15/02 Analyzed 12/16/02 <br /> Methyl tert-butyl ether 100 050 119/1 100 100 63-137 587 13 <br /> Benzene 108 050 100 108 78-124 474 12 <br /> 'toluene 996 050 10 0 89 6 78-129 0 889 10 <br /> Surrogate I 1-Dichloroethane-d4 529 500 106 78-129 <br /> Laboratory Control Sample Dup(2L15003-BSD2) Prepared 12/15/02 Analyzed 12/16/02 <br /> Methyl tert-butyl ether 819 050 ug/l 940 975 63-137 0 122 13 <br /> Benzene 5 38 050 528 102 78-124 264 12 <br /> Toluene 380 050 318 119 78-129 29 3 10 QR-02 <br /> Gasolme Range Organics(C6-C 10) 528 50 440 120 70-113 306 9 Q-LIM <br /> *rrogale I 1-Dichloroethane-d4 514 500 103 78-129 <br /> Batch 2L17010-EPA 5035 <br /> Blank(2L17010-BLK1) Prepared&Analyzed 12/17/02 <br /> Ethanol ND 40 ug/] <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-Dichloroethane 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 12-Dtchloroethane-d4 543 500 109 78-129 <br /> ,Sequoia <br /> 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 /> Page 9 of I I <br />