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,z <br /> 1455 McDowell Blvd North Ste D <br /> Sequoia Petaluma CA 94954 <br /> (707)792-1865 <br /> Analytical FAX(707)792-0342 <br /> www seyuoialabs corn <br /> URS Corp-Sacramento Project Arco Site 2186,Stockton,CA P406360 <br /> 2870 Gateway Oaks Drive Suite 300 Project Number WR36593 Reported <br /> Sacramento CA,95833 Project Manager Vernon P Elarth 07/29/04 07 39 <br /> Volatile Organic Compounds by EPA Method 8260B - Quality Control <br /> Sequoia Analytical -Petaluma <br /> Reporting Spike Source %uREC RPP <br /> Analyte Result Limit Units Level Result °1REC Limits RPD Lima Notes <br /> Batch 4060627-EPA 5030B waters <br /> Matrix Spike(4060627-MSI) Source P406360-04 Prepared&Analyzed 06/29/04 <br /> Tert-amyl methyl ether 2660 500 ug/1 2500 ND 106 78-117 <br /> Benzene 2620 250 2500 ND 105 81-118 r <br /> Tert-butyl alcohol 51600 10000 50000 ND 103 60-147 <br /> Di-isopropyl ether 2860 500 " 2500 ND 114 70-125 <br /> 1,2-Dibromoethane(EDB) 2600 250 2500 ND 104 85-125 <br /> 1,2-Dichloroethane 3040 250 2500 ND 122 77-126 <br /> Ethanol 54700 50000 50000 ND 109 55-200 <br /> Ethylbenzene 2560 250 " 2500 ND 102 89-122 <br /> Ethyl tert-butyl ether 2780 500 2500 ND 111 71-120 / <br /> Methyl tert-butyl ether 12900 250 " 2500 10000 116 70-122 <br /> uene 2580 250 2500 ND 103 84-119 <br /> enes(total) 7880 250 7500 ND 105 86-132 <br /> 4ol2 <br /> Surrogate Dibromofluoromethane 547 500 109 84-122 <br /> Surrogate 1 2-Diehloroethane-d4 5 94 500 119 74-135 <br /> Surrogate Toluene-d8 508 500 102 84-119 <br /> Surrogate 4-Bromofluorobenzene 526 " 500 105 86-119 <br /> Matrix Spike Dup(4060627-MSDI) Source P406360-04 rA W 1�j Prepared&Analyzed 06/29/04 <br /> Tert-amyl methyl ether 2840 500 UO 2500 ND 114 78-117 7 20 <br /> Benzene 2730 250 2500 ND 109 81-118 4 20 <br /> Tert butyl alcohol 50800 10000 50000 ND 102 60-147 2 20 <br /> Di-isopropyl ether 3070 500 2500 ND 123 70-125 7 20 <br /> 1,2-Dibromoethane(EDB) 2730 250 2500 ND 109 85-125 5 20 <br /> 1,2-Dichloroethane 3090 250 2500 ND 124 77-126 2 20 <br /> Ethanol 50600 50000 50000 ND 101 55-200 8 20 <br /> Ethylbenzene 7.560 250 2500 ND 102 89-122 0 20 <br /> Ethyl tert-butyl ether 2940 500 2500 ND 118 7t-120 6 20 <br /> Methyl tert-butyl ether 13700 250 2500 10000 148, jt,70-122 6 20 QM04 <br /> Toluene 2580 250 " 2500 ND 103 84-119 0 20 <br /> Xylenes(total) 7990 250 " 7500 ND 107 86-132 1 20 <br /> Surrogate Dibromofluoromethane 5 78 500 116 84-122 <br /> Surrogate 1 2-Dichloroethane-d4 6 49 500 130 74-135 <br /> Surrogate Toluene-d8 537 500 107 84-119 <br /> Surrogate 4-8romofl uorobenzene 537 500 107 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 stared results are reported on a wet weight basis <br /> This analytical report must be reproduced in its entirety <br /> Page 17 of 21 <br />