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885 Jarvis Drive <br /> Sequoia McYgriEfill CA 037 <br /> (4 6)776-9600 <br /> 08 <br /> Analytical WW seq 8ialabs um <br /> WWW segvotalabs cum <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 %RBC RPD <br /> Analyte Result Limit Units Level Result %REC Limits RPD Limit Notes <br /> Batch 4H23002-EPA 5030B PIT <br /> ]Laboratory Control Sample(4H23002-BSI) Prepared&Analyzed 08/23/04 <br /> Surrogate 1 2-Dichloroethane-d4 482 ug/l 500 96 78-129 <br /> Laboratory Control Sample(4H23002-BS2) Prepared&Analyzed 08/23/04 <br /> Benzene 555 050 ugll 640 87 69-124 <br /> Ethylbenzene 759 050 6 96 109 84-132 <br /> Methyl tert-butyl ether 8 82 0 50 992 89 63-137 <br /> Toluene 31 9 050 297 107 78-129 <br /> Xylenes(total) 38 7 050 337 115 83-137 <br /> Gasoline Range Organics(C4-C 12) 406 50 440 92 70-124 <br /> Surrogate 1,2-Dichloroethane-d4 498 500 100 78-129 <br /> Laboratory Control Sample Du (4H23002-BSDI) Prepared&Analyzed 08/23/04 <br /> tet-Amyl methyl ether 961 0 50 ug/I 100 96 82-140 2 20 <br /> . Benzene 930 050 100 93 69-124 3 20 <br /> tert-Butyl alcohol 482 20 500 96 56-131 2 20 <br /> Di-isopropyl ether 933 0 50 100 93 76-130 0 2 20 <br /> 1,2 Dichloroethane 969 0 50 100 97 77-136 0 7 20 <br /> Ethanol 188 100 200 94 31-143 9 20 <br /> Ethyl tert butyl ether 929 050 100 93 81-121 0 9 20 <br /> Ethylbenzene 9 56 050 100 96 84-132 6 20 <br /> Methyl tert-butyl ether 936 050 100 94 63-137 0 3 20 <br /> Toluene 9 15 050 " 100 92 78-129 4 20 <br /> Xylenes(total) 299 0 50 300 100 83-137 6 20 <br /> Surrogate 1,2-Dichloroethane-d4 460 500 92 78-129 <br /> Matnx Spike(41123002-MSI) Source MNH0328-06 Prepared&Analyzed 08/23/04 <br /> Benzene 595 050 ug/I 640 0 15 91 69-124 <br /> Ethylbenzene 825 0 50 6 96 ND 119 84-132 <br /> Methyl tent-butyl ether 9 91 050 992 059 94 63-137 <br /> Toluene 346 0 50 297 037 115 78-129 <br /> Xylenes(total) 422 050 337 0 50 124 83-137 <br /> Gasoline Range Organics(C4-C 12) 405 50 440 ND 92 70-124 <br /> Surrogate 1 2-Dichloroethane-0 494 500 99 78-129 <br /> Sequoia 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 he reproduced in its entirety <br /> Page 12 of 14 <br />