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885 Tarns Dave <br /> a— ) Sequoia Morgan all CA 95037 <br /> (408)776-91500 <br /> Analytical FAX(409)792 6308 <br /> www sequoialabs com <br /> URS Corporation[Arco II Project ARCO#2168,Stockton,CA MNH0329 <br /> 2870 Gateway Oaks Dr,Ste 300 Project Number NIP Reported <br /> Sacramento CA,95833 Project Manager Vernon P Elarth 09/01/04 17 42 <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 Lima Notes <br /> Batch 4H23002-EPA 50308 PIT <br /> Matnz Spike Dup(4H23002-MSD1) Source MNH0328-06 Prepared&Analyzed 08/23/04 <br /> Benzene 571 050 ug/I 640 0 15 87 69-124 4 20 <br /> Ethylbenzene 8 19 050 696 ND 118 84-132 07 20 <br /> Methyl tert-butyl ether 930 050 992 059 88 63-137 6 20 <br /> Toluene 329 050 297 037 110 78-129 5 20 <br /> Xylenes(total) 426 050 337 050 125 83-137 09 20 <br /> Gasoline Range Organics(C4-C12) 398 50 440 ND 90 70-124 2 20 <br /> Surrogate 1 2-Dichloroeihane-d4 473 500 95 78-129 <br /> Sequoia Analytical-Morgan Hill 77te 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 13 of 14 <br />