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885 Jarvis Drive <br /> Sequoia Morgan Mfl CA 95037 <br /> (408)776-9600 <br /> Analytical <br /> FAX(408)782 6308 <br /> www sequoialabs com <br /> URS Corporation[Arco II Project ARCO 42168,Stockton,CA MNH0329 <br /> 2870 Gateway Oaks Dr,Ste 300 Project Number N/P 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 /> An Result Limit Units Level Result %REC Limits RPD LIm11 Notts <br /> Batch 4H22001 -EPA 5030B P/T <br /> Blank(4H22001-BLK1) Prepared&Analyzed 08/22/04 <br /> tert-Amyl methyl ether ND 050 ug/I <br /> Benzene ND 050 " <br /> tent-Butyl alcohol ND 20 " <br /> Do-isopropyl ether ND 050 " <br /> 1 2-Dichloroethane ND 050 " <br /> Ethanol ND 100 " <br /> Ethyl tent-butyl ether ND 050 " <br /> Ethylbenzene ND 050 " <br /> Methyl tert-butyl ether ND 050 " <br /> Toluene ND 050 " <br /> Xylenes(total) ND 050 " <br /> Gasoline Range Organics(C4-C 12) ND 50 " <br /> •Surrogate 1 2-Drchloroethane-d4 416 500 85 78-129 <br /> Laboratory Control Sample(4H22001-BSI) Prepared&Analyzed 08/22/04 <br /> tert Amy]methyl ether 10 4 050 ug/l 100 104 82-140 <br /> Benzene 105 050 100 105 69-124 <br /> tent-Butyl alcohol 51 3 20 500 103 56-131 <br /> Di-isopropyl ether 10 2 050 100 102 76-130 <br /> 1,2-Dichloroethane 10 8 0 50 100 108 77-136 <br /> Ethanol 194 100 200 97 31-143 <br /> Ethyl tert-butyl ether 10 3 0 50 10 0 103 81-121 <br /> Ethylbenzene 9 87 050 10 0 99 84-132 <br /> Methyl tert-butyl ether 10 4 050 10 0 104 63-137 <br /> Toluene 9 74 050 100 97 78-129 <br /> Xylenes(total) 306 050 300 102 83-137 <br /> Surrogate 12-Dichloroethane-d4 487 500 97 78-129 <br /> Sequoia Analytical -Morgan Hill The results in this report apply to the samples analyzed to accordance with the chain of <br /> custody document Unless otherwise stated results are reported on a wet weight basis <br /> 77us analytical report must be reproduced in its entirety <br /> Page 9 of 14 <br />