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865 Drive <br /> Sequoia Morgan Hill <br /> CA l CA 950375037 <br /> (406)776-9600 <br /> r Analytical FAX equot labs c 06 <br /> www sequotalabs coin <br /> 0 <br /> URS Corporation[Arco I] Project ARCO#6020,Manteca,CA MOL0445 <br /> 2870 Gateway Oaks Dr,Ste 300 Project Number GOC 1 V-0002 Reported <br /> Sacramento CA,95833 Project Manager Vernon P Elarth 12/29/05 17 44 <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 t.tmt Notes <br /> Batch 5L20018-EPA 5030E PIT 1 EPA 8260B <br /> Matrix Spike(5L20018-MSI) Source MOL0448-08 Prepared 12/20/05 Analyzed 12/21/05 <br /> tert-Amy)methyl ether 1520 50 ugll 1500 ND 101 80-115 <br /> Benzene 599 50 516 ND 116 65-115 LM <br /> tert-Butyl alcohol 14800 2000 14300 ND 103 75-120 <br /> Di-isopropyl ether 1750 50 1510 ND 116 75-125 <br /> 1,2-Dtbromoethane(EDB) 1580 50 1490 ND 106 85-120 <br /> 1,2-Dichloroethane 1920 50 1470 ND 131 85-130 LM <br /> Ethanol 19500 10000 14200 ND 137 70-135 LM <br /> Ethyl tent butyl ether 1700 50 1500 ND 113 75-130 <br /> Ethylbenzene 737 50 754 ND 98 75-135 <br /> Methyl tert-butyl ether 5720 50 702 4100 231 65-125 BB,LM <br /> Toluene 3990 50 3720 ND 107 85-120 <br /> lenes(total) 3700 50 4120 ND 90 85-125 <br /> asoline Range Organics(C4 C12) 42000 5000 44000 2200 90 60-140 <br /> Surrogate 12-Dichloroethane-d4 138 150 95 60-135 <br /> Matrix Spike Dup(5L20018-NISDI) Source MOL0448-08 Prepared 12/20/05 Analyzed 12/21/05 <br /> tert-Amyl methyl ether 1460 50 ug1l 1500 ND 97 80-115 4 15 <br /> Benzene 568 50 516 ND 110 65-115 5 20 <br /> tert-Butyl alcohol 12600 2000 14300 ND 88 75-120 16 25 <br /> Di-isopropyl ether 1740 50 1510 ND 115 75-125 06 15 <br /> 1,2 Dtbromoethane(EDB) I500 50 1490 ND 101 85-120 5 15 <br /> 12-Dichloroethane 1770 50 1470 ND 120 85-130 8 20 <br /> Ethanol 19500 10000 14200 ND 137 70-135 0 35 LM <br /> Ethyl tert butyl ether 1620 50 1500 ND 108 75-130 5 25 <br /> Ethylbenzene 691 50 754 ND 92 75-135 6 15 <br /> Methyl tert butyl ether 5420 50 702 4100 188 65-125 5 20 BB,LM <br /> Toluene 3830 50 3720 ND 103 85-120 4 20 <br /> Xylenes(total) 3560 50 4120 ND 86 85-125 4 20 <br /> Gasoline Range Organics(C4-C12) 43300 5000 44000 2200 93 60-140 3 25 <br /> Surrogate 1 2 Dichloroethane-d4 256 150 102 60-135 <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 entrrety <br /> Page 9 of 12 <br />