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885Jams Drive <br /> CA <br /> Sequoia Morgan I1cu CA 9550337 <br /> (408)776-9600 <br /> FAX r� 09 <br /> Analytical wwseg8ialabs om <br /> www sequoialsbs com <br /> URS Corporation FAreoll Project ARCO#6020,Manteca,CA MNH0330 <br /> 2870 Gateway Oaks DT,Ste 300 Project Number N/P Reported <br /> Sacramento CA,95833 Project Manager Vernon P Elarth 09/16/04 12 03 <br /> Volatile Organic Compounds by EPA Method 8260B - Quality Control <br /> Sequoia Analytical-Morgan Hill <br /> Reporting Spike Source %uREC RPD <br /> Analyte Result Limit Units Level Result %REC Limits RPD Limit Notes <br /> Batch 4H18028-EPA 5030B PIT <br /> Laboratory Control Sample(4HI8028-BS2) Prepared&Analyzed 08/18/04 <br /> Benzene 550 050 ug/I 640 86 69-124 <br /> Ethylbenzene 8 19 050 696 118 84-132 <br /> Methyl tert butyl ether 892 050 992 90 63-137 <br /> Toluene 325 050 297 109 78 129 <br /> Xylenes(total) 404 050 317 120 83-137 <br /> Gasoline Range Organics(C4 C12) 415 50 440 94 70-124 <br /> Surrogate I 1-Dichloroethane-d4 222 250 89 78-129 <br /> Laboratory Control Sample Dup(4H18028-BSDI) Prepared 08/18/04 Analyzed 08/19/04 <br /> tert-Amyl methyl ether 108 050 ug/1 100 108 82-140 09 20 <br /> Benzene 10 2 050 100 102 69-124 3 20 <br /> tert-Butyl alcohol 464 20 50 0 93 56-131 2 20 <br /> Di isopropyl ether 105 050 100 105 76-130 3 20 <br /> 2-Dibromoethane(EDB) 100 050 100 100 77-132 1 20 <br /> 1 2-Dichloroethane 101 050 100 101 77-136 0 20 <br /> Ethanol 155 100 200 78 31-143 6 20 <br /> Ethyl tert-butyl ether 109 050 100 109 81-121 3 20 <br /> Ethylbenzene 10 2 050 100 102 84-132 1 20 <br /> Methyl tert-butyl ether 102 050 100 102 63-137 2 20 <br /> Toluene 986 050 100 99 78-129 1 20 <br /> Xylenes(total) 31 1 050 300 104 83-137 l 20 <br /> Surrogate 12-Drchloroethane-d4 235 150 44 78-129 <br /> Matrix Spike(4H18028-MSI) Source MNHO160-03 Prepared 08/18/04 Analyzed 08/19/04 <br /> Benzene 2920 250 ug/I 3200 200 85 69-124 <br /> Ethylbenzene 6600 250 3480 2500 118 84-132 <br /> Methyl tent-butyl ether 4040 250 4960 ND 81 63-137 <br /> Toluene 23300 250 14800 7500 107 78-129 <br /> Xylenes(total) 33400 250 16800 14000 115 83-137 <br /> Gasoline Range Organics(C4-C12) 266000 25000 220000 58000 95 70-124 <br /> Surrogate 12-Dichloroethane-d4 223 250 89 78-119 <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 be reproduced in its enirrety <br /> Page 14 of]8 <br />