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1885 Drive <br /> Sequoia Morgan Hill <br /> CA CA 450375037 <br /> (408)776-9600 <br /> An aiytical FAX(408)782-6308 <br /> www"uoialabs com <br /> 0 <br /> URS Corporation[Arco 1 I Project ARCO#6020,Manteca,CA MOH 1005 <br /> 2870 Gateway Oaks Dr,Ste 300 Project Number GOCI V-0002 Reported <br /> Sacramento CA,95833 Project Manager Vernon P Elarth 09/01/05 17 52 <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 5H26005-EPA 50308 PIT I EPA 8260B <br /> Laboratory Control Sample(5H26005-BSI) Prepared&Analyzed 08/26/05 <br /> tert-Amyl methyl ether 782 050 ug/I 752 104 80-115 <br /> Benzene 272 050 2 58 105 65-115 <br /> tert-Butyl alcohol 710 20 715 99 75-150 <br /> Di-isopropyl ether 7 88 050 757 104 75-125 <br /> 1,2-Dibromoethane(EDB) 858 050 742 116 85-120 <br /> 1,2-Dichloroethane 769 050 736 104 85-130 <br /> Ethanol 904 100 707 128 70-135 <br /> Ethyl tert-butyl ether 785 0 50 751 105 75-130 <br /> Ethylbenzene 378 050 377 100 75-135 <br /> Methyl tert butyl ether 367 050 3 51 105 65-125 <br /> Toluene 18 9 050 186 102 85-120 <br /> Xylenes(total) 223 050 207 108 85-125 <br /> Oasoline Range Organics(C4-C12) 254 50 220 115 70-124 <br /> Surrogate I1-Dichloroethane-d4 193 150 77 60-135 <br /> Laboratory Control Sample(5H26005-BS2) Prepared&Analyzed 08/26/05 <br /> tent-Amyl methyl ether 778 0 50 ug/1 7 52 103 80 115 <br /> Benzene 2 71 050 2 58 105 65-115 <br /> tert-Butyl alcohol 78 2 20 71 5 109 75-150 <br /> Do-isopropyl ether 803 050 7 57 106 75-125 <br /> 1,2-Dibromoethane(EDB) 849 050 742 114 85-120 <br /> 1?-Dichloroethane 756 050 736 103 85-130 <br /> Ethanol 730 100 707 103 70-135 <br /> Ethyl tert-butyl ether 779 050 751 104 75-130 <br /> Ethylbenzene 399 050 377 106 75-135 <br /> Methyl tert-bury]ether 3 61 0 50 3 51 103 65-125 <br /> Toluene 189 050 186 102 85-120 <br /> Xylenes(total) 229 050 207 111 85-125 <br /> Gasoline Range Organics(C4-Cl2) 240 50 220 109 70-124 <br /> Surrogate 12-Dichloroethane d4 2 03 150 81 60-135 <br /> Sequoia Analytical-Morgan Hill The results in ibis 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 9 of 11 <br />