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l Blvd,North Ste <br /> 1455 McDowPetaaluma,CA 94954 <br /> Sequoia (707)792 1865 <br /> Analytical FAX 792-0342 <br /> www sequoiequoialabs coin <br /> Is <br /> URS Corp-Sacramento Project Arco Site 2168,Stockton,CA P311134 <br /> 2870 Gateway Oaks Drive Suite 300 Project Number WR36590 Reported <br /> Sacramento CA,95833 Project Manager Vernon P Elarth 11/18/03 18 08 <br /> Volatile Organic Compounds by EPA Method 8260B- Quality Control <br /> Sequoia Analytical -Petaluma <br /> Reporting Spike Source %REC RPD <br /> Analyte Result Limit Units Level Result %RUC Limits RPD Limit Notes <br /> Batch 3110310-EPA 5030 waters <br /> Matrix Spike(3110310-MSI) Source P311134-05REI Prepared&Analyzed 11/14/03 <br /> Teri-amyl methyl ether 1 100 250 ug/l 1250 ND 88 70-116 <br /> Benzene 8240 120 1250 6900 107 81-118 <br /> Tert-butyl alcohol 18900 5000 25000 ND 76 62-142 <br /> Di-isopropyl ether 1030 250 1250 ND 82 71-121 <br /> 1,2-Dibromoethane(EDB) 1210 120 1250 ND 97 92-117 <br /> I,2-Dichloroethane 1210 120 1250 ND 97 79-126 <br /> Ethanol 23900 25000 25000 ND 96 65-135 <br /> Ethylbenzene 2990 120 1250 1700 103 89-122 <br /> Ethyl tert-butyl ether 1040 250 1250 ND 83 71-110 <br /> Methyl tert-butyl ether 1050 120 1250 ND 84 77-123 <br /> Toluene 1230 120 1250 46 95 84-119 <br /> Xylenes(total) 4000 120 3750 350 97 86-132 <br /> rrogate Dibromofluoromethane 4 75 450 106 84-122 <br /> Surrogate 12-Dichloroethane-d4 432 450 96 74-135 <br /> Surrogate Toluene-4 505 450 112 84-119 <br /> Surrogate 4-Bromofluorobenzene 527 450 117 86-119 <br /> Matrix Spike Dup(3110310-MSD1) Source P311134-05RE1 Prepared&Analyzed 11/14/03 <br /> Teri-amyl methyl ether 1070 250 ugll 1250 ND 86 70-116 3 20 <br /> Benzene 7980 120 1250 6900 86 81-118 3 20 <br /> Tett-butyl alcohol 23300 5000 25000 ND 93 62-142 21 20 Q-LIM <br /> Di-isopropyl ether 1030 250 1250 ND 82 71-121 0 20 <br /> 1,2-Dibromoethane(EDB) 1180 120 1250 ND 94 92-117 3 20 <br /> 1,2-Dichloroethane 1210 120 1250 ND 97 79-126 0 20 <br /> Ethanol 26800 25000 25000 ND 107 65-135 11 20 <br /> Ethyibenzene 2930 120 1250 1700 98 89-122 2 20 <br /> Ethyl tert-butyl ether 1030 250 1250 ND 82 71-110 1 20 <br /> Methyl tert butyl ether 1030 120 1250 ND 82 77-123 2 20 <br /> Toluene 1180 120 1250 46 91 84-119 4 20 <br /> Xylenes(total) 3940 120 3750 350 96 86-132 2 20 <br /> Surrogate Dibromofluoromethane 483 450 107 84-122 <br /> Surrogate 12-Dichloroelhane-d4 437 450 97 74-135 <br /> Surrogate Toluene-d8 502 450 112 64-119 <br /> Surrogate 4-Bromofluorobenrene 516 450 115 86-119 <br /> Sequoia Analytical-Petaluma 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 16 of 17 <br />