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s Drive <br /> Sequoia MorganBaSJa A95037 <br /> 4D Hill CA 95037 <br /> (408)776-9600 <br /> Analytical se 08)782-6308 <br /> www guoratabs com <br /> URS Corporation{Arco l l Project ARCO 96020,Manteca,CA MNH0330 <br /> 2870 Gateway Oaks Dr,Ste 300 Project Number N/P Reported <br /> Sacramento CA,95833 Project Manager Vernon P Earth 09/16/04 12 03 <br /> Volatile Organic Compounds by EPA Method 8260B - Quality Control <br /> Sequoia Analytical -Morgan Hill <br /> Reporting Spike Source %RSC RPD <br /> Analyte Result Limit Units Level Result "/oREC Limits RPD Limit Notes <br /> Batch 41F118028-EPA 5030B P/T <br /> Blank(4H18028-BLKI) Prepared&Analyzed 08/18/04 <br /> tett-Amyl methyl ether ND 050 ug/1 <br /> Benzene ND 050 " <br /> tert-Butyl alcohol ND 20 " <br /> Di-isopropyl ether ND 050 " <br /> 1,2-Dibromoethane(EDB) ND 050 " <br /> 1,2-Dichloroethane ND 050 " <br /> Ethanol ND 100 " <br /> Ethyl tert-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 /> A1111111110asoline Range Organics(C4-C12) ND 50 " <br /> u--gate 12-Dichloroethane-d4 204 250 82 78-129 <br /> Laboratory Control Sample(4HI8028-BSI) Prepared&Analyzed 08/18/04 <br /> tert-Amyl methyl ether 107 050 ug/1 100 107 82-140 <br /> Benzene 993 050 100 99 69-124 <br /> tert-Butyl alcohol 472 20 500 94 56-131 <br /> Di-isopropyl ether 102 050 IOU 102 76-130 <br /> 1,2-Dibromoethane(EDB) 101 050 IOU 101 77-132 <br /> 1,2-Dichloroethane to] 050 " IOU 101 77-136 <br /> Ethanol 164 100 200 82 3I-143 <br /> Ethyl tert-butyl ether 106 050 100 106 81-121 <br /> Ethylbenzene 103 050 100 103 84-132 <br /> Methyl tert butyl ether too 050 " 100 100 63-137 <br /> Toluene 973 050 loo 97 78-129 <br /> Xylenes(total) 308 050 300 103 83-137 <br /> Surrogate 1 2-Drchloroethane-d4 204 250 81 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 be reproduced in its entirety <br /> Page 13 of 18 <br />