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1 <br /> r Y'. 885 Jarvis Drive <br /> Sequoia Morgan Hill,CA 95037 <br /> (408)782-9600 <br /> Analytical <br /> FAX(408)782-6308 <br /> www.sequoialabs.corn <br /> URS Corporation rArcoll Project: ARCO#0548,Stockton,Ca MNH0053 <br /> 2870 Gateway Oaks Dr.,Ste 300 Project Number: N/P Reported: <br /> Sacramento CA,95833 Project Manager: Vemon P.Elarth 08/06/04 16:20 <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 4HO6002-EPA 5030B PIT <br /> Laboratory Control Sample(4H06002-BS1) Prepared&Analyzed:08/06/04 <br /> Surrogate: 1,2-Dichloroethane-d4 5.11 ug/l 5.00 102 78-129 <br /> Laboratory Control Sample(4H06002-BS2) Prepared&Analyzed: 08/06/04 <br /> Benzene 6.00 0.50 ug/l 6.40 94 69-124 <br /> Ethylbenzene 8.57 0.50 " 6.96 123 84-132 <br /> Methyl tert-butyl ether 10.4 0.50 9.92 105 63-137 <br /> Toluene 36.5 0.50 29.7 123 78-129 <br /> r Xylenes(total) 39.6 0.50 33.7 118 83-137 <br /> Gasoline Range Organics(C4-C12) 382 50 440 87 70-124 <br /> Surrogate:1,2-Dichloroethane-d4 5.09 5.00 102 78-129 <br /> I <br /> r <br /> r <br /> i <br /> r <br /> r <br /> r. <br /> equoia 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 15 of 16 <br />