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885 j.,vis Drive <br /> Sequoia Morgan Hill,CA 95037 <br /> (408)776.9606 <br /> A n a ly$l C a FAX(408)782-6308 <br /> www.sequoialabs.com <br /> URS Corporation[Arco II Project: ARCO#0548,Stockton,Ca MNH0053 <br /> 2870 Gateway Oaks Dr.,Ste 300 Project Number: N/P Reported: <br /> ' Sacramento CA,95833 Project Manager: Vernon 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 bevel Result %REC limits RPD limit Notes <br /> Batch 4HO5021 -EPA 5030B PIT <br /> Blank(4H05021-BLKI) Prepared&Analyzed: 08/05/04 <br /> ' tert-Amyl methyl ether ND 0.50 ug/l <br /> Benzene ND 0.50 " <br /> tent-Butyl alcohol ND 20 " <br /> Di-isopropyl ether ND 0.50 " <br /> 1,2-13ichloroethane ND 0.50 " <br /> Ethanol ND 100 " <br /> Ethyl tert-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-C 12) ND 54 <br /> Surrogate:1,2-Dichloroethane-d4 4.98 5.00 100 78-129 <br /> Laboratory Control Sample(4H05021-BSI) Prepared&Analyzed: 08/05/04 <br /> tent-Amyl methyl ether 11.0 0.50 ugfl 10.0 110 82-140 <br /> Benzene 10.4 0.50 oo10.0 104 69-124 <br /> ' tert-Butyl alcohol 54.7 20 50,0 109 56431 <br /> Di-isopropyl ether 10.3 0.50 10.0 103 76-130 <br /> 1,2-Dichloroethane 10.5 0.50 10.0 105 77-136 <br /> Ethanol 208 100 „ 200 104 31-143 <br /> Ethyl tert-butyl ether 10.5 0.50 10.0 105 81-121 <br /> Ethylbenzene 10.9 0.50 10,0 109 84-132 <br /> Methyl tert-butyl ether 10.6 0.50 10.0 106 63-137 <br /> Toluene 12.9 0.50 „ 10.0 129 78-129 <br /> Xylenes(total) 30.9 0.50 30.0 103 83-137 <br /> Surrogate:1,2-Dichloroethane-d4 4.76 5.00 95 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 10 of 16 <br />