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885 Jarvis Dr <br /> Sequoia Mogan Hill,CA 95037 <br /> (408)776-96011 <br /> 14W Analytical FAX(409)782-6308 <br /> www sequoialabs can <br /> RS Corporation[l] Pro3ect ARCO#}6020,Manteca,CA MLL0107 <br /> 2870 Gateway Oaks Dr,Ste 30p Project Number ARCO#6020,Manteca,CA Reported <br /> Sacramento CA,95833 Pro3ect Manager Vem Elarth 12131102 08 34 <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 2L10015-EPA 5035 <br /> Laboratory Control Sample Dup(2L10015-BSD1) Prepared&Analyzed 12/10/02 <br /> Methyl tert-butyl ether 120 050 ug/l 100 120 63-137 339 13 <br /> Benzene 998 050 100 998 78-124 412 12 <br /> Toluene 951 050 IOU 951 78-129 270 I0 <br /> Surrogate 12-Dichloroethane d4 435 500 870 78-129 <br /> Laboratory Control Sample Dup(2L 1001 5-BSD2) Prepared&Analyzed 12/10/02 <br /> Methyl tert-butyl ether 106 050 ug/1 840 126 63-137 000 13 <br /> Benzene 5 15 050 528 975 78-124 000 12 <br /> Toluene 295 050 318 928 78-129 000 10 <br /> Gasoline Range Organics(C6-C 10) 481 50 440 109 70-113 800 9 <br /> 4 rrogate 1 2-Dichloroethane-d4 460 500 920 78-129 <br /> Batch 2L30018-EPA 5030B PIT <br /> Blank(2L30018-BLK1) Prepared&Analyzed 12/27/02 <br /> Ethanol ND 40 ug/l <br /> tent-Butyl alcohol ND 20 " <br /> Methyl tent-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-Dichloroethane-d4 4 94 500 988 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 /> I <br /> Page 7 Of 9 <br /> I <br /> I <br />