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885 Jarvis Dr <br /> Sequoia Mcrpn Hill,CA 95037 <br /> (408)776.9600 <br /> a— ) <br /> Analytical FAX(408)792-6308 <br /> www sequoialabs can <br /> RS Corporation[11 Project ARCO#6020,Manteca,CA MLL0107 <br /> 2870 Gateway Oaks Dr,Ste 300 Project Number ARCO#6020,Manteca,CA Reported <br /> Sacramento CA,95833 Project Manager Vern Elarth 12/31/02 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 2L30018-EPA 5030B P/T <br /> Laboratory Control Sample(2L300I8-BS1) Prepared&Analyzed 12/27/02 <br /> Methyl tert butyl ether 122 050 ugll 100 122 63-137 <br /> Benzene 108 050 100 <br /> 108 78-124 <br /> Toluene 1 1 6 050 100 116 78-129 <br /> Surrogate 12-Dichloroethane-d4 489 500 978 78-129 <br /> Laboratory Control Sam le(2L30018-BS2) Prepared&Analyzed 12/27/02 <br /> Gasoline Range Organics(C6-C 10) 230 50 ug/1 275 83 6 70-113 <br /> Surrogate 1,2-Dichloroethane-d4 407 500 814 78-129 <br /> Laboratory Control Sample Dv (2L30018-BSD1) Prepared&Analyzed 12127/02 <br /> ethyl tett-butyl ether 119 050 u <br /> $(l 100 119 63-137 249 13 <br /> nzene 107 050 100 107 78-124 0 930 12 <br /> Toluene 116 050 100 116 78-129 000 10 <br /> Surrogate 12-Dichloroethane-d4 510 500 102 78-129 <br /> Laboratory Control Sample Dup(2L30018-BSD2) Prepared&Analyzed 12/27/02 <br /> Gasoline Range Organics(C6-C10) 236 50 ug/] 275 85 8 70-113 258 9 <br /> Surrogate 1,2-Dichloroethane-d4 420 500 840 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 /> Page 8 of 9 <br />