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985 Jarvis Drive <br /> 1 <br /> Sequoia Morgan 900 <br /> ''1 (4040 77 % <br /> 8)776 9600 <br /> FAX(408)782-6308 <br /> Analytical wwwsequoialabsCUM <br /> URS Corporation[ArcoI Project ARCO#6020,Manteca,CA MN1-10330 <br /> 2870 Gateway Oaks Dr,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 °/6REC RPD <br /> Analyte Result Limit Units Level Result %REC Limits RPD Limit Notes <br /> Batch 4H18002-EPA 5030B PIT <br /> Laboratory Control Sample(41118002-BS2) Prepared&Analyzed 08/18/04 <br /> Gasoline Range Organics(C4-C12) 419 50 ugll 440 95 70-124 <br /> Surrogate 1 2-Dichloroethane d4 463 Soo 93 78-129 <br /> Laboratory Control Sample Dup(4H18002-BSDI) Prepared&Analyzed 08/18/04 <br /> tert-Amyl methyl ether 126 050 ug/I 100 126 82-140 Is 20 <br /> Benzene 997 0 50 100 100 69-124 6 20 <br /> tert-Bury]alcohol 541 20 500 108 56 131 09 20 <br /> Di-isopropyl ether 116 050 100 116 76-130 12 20 <br /> 1,2-Dibromoethane(EDB) 116 050 100 116 77-132 9 20 <br /> 1,2-Dtchloroethane 927 050 100 83 77-136 15 20 <br /> Ethanol 139 100 200 70 31-143 07 20 <br /> Ethyl tert-butyl ether 11 3 050 100 113 81-121 7 20 <br /> hylbenzene 13 1 050 100 131 84-132 17 20 <br /> ethyl tert-butyl ether 898 050 100 90 63-137 12 20 <br /> Toluene 186 050 100 186 78 129 51 20 HL,BA <br /> Xylenes(total) 352 050 300 117 83-137 12 20 <br /> Surrogate 1 2-Dtchloroethane-d4 366 500 73 78-129 LG <br /> Matrix Spike(4H18002-MSI) Source MNH0099-05 Prepared 08/18/04 Analyzed 08/19/04 <br /> Benzene 1240 25 ug/l 320 930 97 69-124 <br /> Ethylbenzene 907 25 348 460 128 84-132 <br /> Methyl tert-butyl ether 638 25 496 140 100 63-137 <br /> Toluene 2040 25 1480 29 136 78-129 HL <br /> Xylenes(total) 2340 25 1680 130 132 83-137 <br /> Gasoline Range Organics(C4-C12) 26800 2500 22000 9100 80 70-124 <br /> Surrogate 1,2-Dichloroethane-d4 469 500 94 78-129 <br /> Matrix Spike Du (4HI8002-MSD1) Source MNH0099-05 Prepared 08/18/04 Analyzed 08/19/04 <br /> Benzene 1150 25 ug/I 320 930 b9 69-124 8 20 <br /> Ethylbenzene 992 25 348 460 153 84-132 9 20 LIM <br /> Methyl tert-butyl ether 570 25 496 140 87 63-137 11 20 <br /> Toluene 2520 25 1480 29 168 78-129 21 20 HL BA <br /> Xylenes(total) 2470 25 1680 130 139 83-137 5 20 LM <br /> Gasoline Range Organics(C4-Cl2) 30000 2500 22000 9100 95 70-124 11 20 <br /> Surrogate 1 2-Dtchloroethane-d4 427 500 85 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 12 of 18 <br />