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885 Jarvis Dr <br /> 4D Sequoia Mcgpn Hid,CA 95037 <br /> Analytical FAX(408408)776-9600 <br /> 782-6308 <br /> Aft www sequaialabs corn <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 12/20/02 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 /> Blank(2L15003-BLK1) Prepared 12/15/02 Analyzed 12/16/02 <br /> Ethanol ND 40 ug/l <br /> tent-Butyl alcohol ND 20 " <br /> Methyl tert-butyl ether ND 050 " <br /> Di-isopropyl ether ND 050 " <br /> Ethyl ten-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 /> Etbylbenzene ND 050 " <br /> Xylenes(total) ND 050 <br /> 10 <br /> solme Range Organics(C6-C10) ND 50 " <br /> Surrogate 12-Dichloroethane-d4 496 500 992 78-129 <br /> Laboratory Control Sample(2L15003-BSI) Prepared 12/15/02 Analyzed 12/16/02 <br /> Methyl tert butyl ether 943 050 ug/l 100 943 63-137 <br /> Benzene 103 050 100 103 78-124 <br /> Toluene 904 050 10 0 904 78-129 <br /> Surrogate 11-Dichloroethane-d4 499 5 00 998 78-129 <br /> Laboratory Control Sample(2L15003-BS2) Prepared 12/15/02 Analyzed 12/16/02 <br /> Methyl ten-butyl ether 8 I8 050 ug/1 840 974 63-137 <br /> Benzene 524 050 528 99 2 78-124 <br /> Toluene 283 050 31 8 89 0 78-129 <br /> Gasoline Range Organics(C6-C10) 388 50 440 88 2 70-113 <br /> Surrogate 12-Dichloroethane-d4 455 500 910 78-129 <br /> ,Sequoia Analytical-Morgan 11111 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 he reproduced in its entirety <br /> Page 8 of 11 <br />