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(7), �ip 885 Jarvis Drive <br /> �7\i u o i d Morgan Hilt,CA 95037 <br /> P"% (408)776-9600 <br /> Analytical FAX(408)labs-co 8 <br /> www.sequoialabs.com <br /> URS Corporation lArcoll Project: ARCO#0548,Stockton,Ca NINH0053 <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 0/6REC RPD <br /> Analyte Result Emit Units level Result %REC Limits RPD Limit Notes <br /> ' Batch 4HO5027-EPA 5030B PIT <br /> Blank(4H05027-BLK1) Prepared&Analyzed:08/05/04 <br /> tert-Amyl methyl ether ND 0.50 ugf l <br /> Benzene ND 0.50 <br /> tert-Butyl alcohol ND 20 " <br /> Di-isopropyl ether ND 0.50 " <br /> 1,2-Dichloroethane ND 0.50 <br /> Ethanol ND L00 iC <br /> Ethyl lert-butyl ether ND 0.50 " <br /> Ethylbenzene ND 0.50 <br /> Methyl tert-butyl ether ND 0.50 <br /> Toluene ND 0.50 " <br /> Xylenes(total) ND 0.50 " <br /> Gasoline Range Organics(C4-C12) ND 50 " <br /> Surrogate:l,2-Dichloroethane-d4 2.34 2.50 94 78-129 <br /> Laboratory Control Sample(4H05027-BS1) Prepared&Analyzed:08/05/04 <br /> tert-Amyl methyl ether 10.1 0.50 ugll 10.0 101 56-140 <br /> Benzene 9.78 0.50 " 10.0 98 78-124 <br /> tert-Butyl alcohol 46.9 20 11 50.0 94 0-206 <br /> Di-isopropyl ether 10.1 0.50 10.0 10I 76-130 <br /> 1,2-Dichloroethane 10.3 0.50 10.0 103 77-136 <br /> Ethanol 166 100 200 83 31-186 IC <br /> Ethyl tert-butyl ether 10.2 0.50 " 10.0 102 61-141 <br /> Ethylbenzene 10.1 0.50 10.0 101 84-117 <br /> Methyl tert-butyl ether 9.99 0.50 10.0 100 63-137 <br /> Toluene 9.67 0.50 ;i 10.0 97 78-129 <br /> Xylenes(total) 30.6 0.50 30.0 102 83-125 <br /> Surrogate:l,2-Dichloroethane-d4 2.14 2.50 86 78-129 <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 12 of 16 <br />