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r <br /> a— ) 885 Jams Drive <br /> Sequoia Morgan 1-LI1 CA 95037037 <br /> (408)776 9600 <br /> Analytical FAX(408)782 6308 <br /> www sequotalabs corn <br /> URS Corporation(Arcoll Project ARCO#2168,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 "/oREC RPD <br /> Analyte Result Limit Units Level Result o/.REC Limits RPD Limit Notes <br /> Batch 4H22001 -EPA 5030B PIT <br /> Matnx Spike Dup(4H22001-MSDI) Source MNH0329-04 Prepared&Analyzed 08/22/04 <br /> Benzene 1230 25 ug/l 320 980 78 69-124 3 20 <br /> Ethylbenzene 467 25 348 70 114 84-132 02 20 <br /> Methyl ten-butyl ether 424 25 496 ND 85 63-137 5 20 PF <br /> Toluene 1780 25 1480 38 118 78-129 2 20 PE <br /> Xylenes(total) 2250 25 1680 140 126 83-137 1 20 <br /> Gasoline Range Organics(C4-C12) 25800 2500 22000 5300 93 70-124 9 20 <br /> Surrogate 12 Dichloroethane-d4 452 300 90 78-129 PF <br /> Batch 4H23002-EPA 5030B PIT <br /> Blank(4H23002-$LK1) Prepared&Analyzed 08/23/04 <br /> tert-Amyl methyl ether ND 050 ug/l <br /> Benzene ND 050 " <br /> tert Butyl alcohol ND 20 " <br /> Di-isopropyl ether ND 0 50 " <br /> 1,2-Dichloroethane ND 0 50 " <br /> Ethanol ND 100 " <br /> Ethyl tert-butyl ether ND 050 " <br /> Ethylbenzene ND 050 " <br /> Methyl tert-butyl ether ACD 050 " <br /> Toluene ND 050 " <br /> Xylenes(total) ND 050 " <br /> Gasoline Range Organics(C4-C12) ND 50 " <br /> Surrogate 1 2-Dichloroethane-d4 4 74 Soo 95 78-129 <br /> Laboratory Control Sample(4H23002-BS1) Prepared&Analyzed 08/23/04 <br /> tert-Amyl methyl ether 940 050 ug/l 100 94 82-140 <br /> Benzene 904 050 100 90 69-124 <br /> ten-Butyl alcohol 472 20 500 94 56-131 <br /> Di-isopropyl ether 935 050 100 94 76-130 <br /> 1,2-Dichloroethane 962 050 100 96 77-136 <br /> Ethanol 172 100 200 86 31-143 <br /> Ethyl ted-butyl ether 921 050 100 92 81-121 <br /> Ethylbenzene 896 050 " 100 90 84-132 <br /> Methyl tert-butyl ether 939 050 100 94 63-137 <br /> Toluene 875 050 Wo 88 78-129 <br /> Xylenes(total) 282 050 300 94 83-137 <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 i 1 of 14 <br />