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/ \ Sequoia 865 Jarvis Drive <br /> - Morgan Nrtl CA 95537 <br /> 037 <br /> ^V� 4406)776 9600 <br /> Analytical FAX(408)782-6308 <br /> www sequoialabs com <br /> URS Corporation[ArcoI I Project ARCO 45469,Stockton,CA MPFO114 <br /> 2870 Gateway Oaks Dr,Ste 300 Project Number GOBZP-0010 Reported <br /> Sacramento CA,95833 Project Manager Jay Johnson 06/30/06 11 12 <br /> Volatile Organic Compounds by EPA Method 8260B- Quality Control <br /> Sequoia Analytical - Morgan Hill <br /> Reporting Spike Source %REC RPD <br /> Analyte Result Limit Units Level Result %REC Limits RPD Limit Notes <br /> Batch 6FO8011 - EPA 5030B Pfr 1 EPA 8260B <br /> Matrix Spike(6F08411-MSI) Source MPF0233-01 Prepared&Analyzed 06/08/06 <br /> tent-Amyl methyl ether 374 12 ugA 376 ND 99 80-115 <br /> Benzene 170 12 129 40 101 65-115 <br /> tert-Butyl alcohol 4970 120 3580 ND 139 75-120 LM <br /> Di isopropyl ether 348 12 378 ND 92 75-125 <br /> 1 2 Dibromoethane(EDB) 404 12 372 ND 109 85 120 <br /> 1,2 Dichloroethane 368 12 368 ND 100 85-130 <br /> Ethanol 3970 2500 3540 ND 112 70-135 <br /> Ethyl tent-butyl ether 360 12 376 ND 96 75-130 <br /> Ethylbenzene 216 12 188 22 103 75-135 <br /> Methyl Cert butyl ether 1140 12 176 890 142 65-t25 BB LM <br /> Toluene 930 12 930 ND 100 85-120 <br /> tolenes(total) 1080 12 1030 14 103 85-125 <br /> soline Range Organics(C4-C12) 12200 1200 11000 1000 102 60-140 <br /> Surrogate 12 Dichloroethane d4 4 71 500 94 60-135 <br /> Surrogate Toluene d8 4 62 500 92 70-120 <br /> Surrogate Dibromofluoromethane 458 " 5 00 92 65-130 <br /> Surrogate 4-Bromofluorobenrene 458 5 00 92 70 120 <br /> Matrix Spike Dup(6FO8011-MSDI) _Source MPF0233-01 _ Prepared&Analyzed 06/08/06 <br /> tent Amy]methyl ether 384 12� ug/l 376 ND 102 80-115 3 15 <br /> Benzene I80 12 129 40 109 65-115 6 20 <br /> tert-Butyl alcohol 4980 120 3580 ND 139 75 120 0 2 25 LM <br /> Di isopropyl ether 356 12 378 ND 94 75-125 2 15 <br /> 1 2-Dibromoethane(EDB) 402 12 372 ND 108 85-120 05 15 <br /> 1 2 Dichloroethane 372 12 368 ND 101 85-130 1 20 <br /> Ethanol 4020 2500 3540 ND 114 70-135 1 35 <br /> Ethyl Cert buryl ether 382 12 376 ND 102 75-130 6 25 <br /> Ethylbenzene 214 12 188 22 102 75-135 0 9 15 <br /> Methyl tert-butyl ether 1160 12 176 890 153 65-125 2 20 BB LM <br /> Toluene 943 12 930 ND 101 85-120 1 20 <br /> Xylenes(total) 1080 12 1030 14 103 85-125 0 20 <br /> Gasoline Range Organics(C4 C12) 12300 1200 11000 1000 103 60-140 0 8 25 <br /> Surrogate 1 2-Drchloroethane d4 4 79 5 00 96 60-135 <br /> Surrogate Toluene-d8 457 5 00 91 70-120 <br /> Surrogate Dtbromofluoromethane 4 78 Soo 96 65 130 <br /> Surrogate 4-Bromofluorobemene 4 70 10 5 00 94 70-120 <br /> Sequoia Analytical-Morgan Hill 77te results m this report apply to the samples analyzed in accordance with the chain of <br /> custody document Unless otherwise stared results are reported on a wet weight basis <br /> This analytical report must be reproduced to try entirety <br /> Page 17 of 20 <br />