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BJarvis Dave <br /> Sequoia MorganFE-b 41 CA 95037 <br /> (408)772-9608 <br /> Analytical FAX 782-6308 <br /> www sequoiequoialahs coni <br /> URS Corporation[Arco I I Project ARCO 40760,Lodi,CA MNL0005 <br /> 2870 Gateway Oaks Dr,Ste 300 Project Number G093Z-0461 Reported <br /> Sacramento CA,95833 Project Manager Vernon P Elarth 12/09/04 20 32 <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 4LO8003-EPA 5030B Modified/EPA 8260B <br /> Matrix Spike Dup(4L08003-MSDI) Source MNL0005-08 Prepared&Analyzed 12/08/04 <br /> Benzene 000516 00050 mg/kg 000640 ND 81 59-126 4 25 <br /> Ethylbenzene 000731 00050 000752 ND 97 60-145 5 25 <br /> Methyl tert-butyl ether 000826 00050 000992 ND 83 47-149 3 25 <br /> Toluene 00308 00050 00319 000015 96 66-142 6 25 <br /> „ <br /> Xylenes(total) 00336 00050 00366 000058 90 83-135 5 25 <br /> Gasoline Range Organics(C4-C12) 0 386 010 0 440 ND 88 53-126 5 25 <br /> Surrogate 1 2-Dichloroethane-d4 000424 000500 85 78-136 <br />�l <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 muss be reproduced in its entirely <br /> Page 7 of 8 <br />