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1455 McDowell Blvd,North Ste D <br /> (D Sequoia Petaluma CA 94954 <br /> (707)792-1862 <br /> Analytical <br /> FAX(707)792-0342 <br /> www sequolalabs corn <br /> URS Corp-Sacramento Protect Arco Site 760,Lodi,CA P501284 <br /> 2870 Gateway Oaks Drive Suite 300 Project Number WR36622 Reported <br /> Sacramento CA,95833 Project Manager Vernon P Elanh 01/28/05 17 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 "/REC Limits RPD Limit Notes <br /> Batch 5010287-EPA 5030B waters/EPA 8260B <br /> Matrix Spike(5010287-MSI) Source P501233-01 Prepared&Analyzed 41/26/05 <br /> Tert-amyl methyl ether 106 20 ug/l 100 ND 106 78-117 <br /> Benzene 9 21 10 100 ND 92 81-118 <br /> Tert-butyl alcohol 200 40 200 ND 100 60-147 <br /> Di-isopropyl ether 938 2 0 100 ND 94 70-125 <br /> 1 2-Dibromoethane(EDB) 998 10 100 ND 100 85 125 <br /> 1,2-Dichloroethane 10 4 1 0 100 ND 104 77-126 <br /> Ethanol 183 200 200 ND 92 55 200 <br /> Ethylbenzene 935 1 0 100 ND 94 89-122 <br /> Ethyl tert-butyl ether 935 2 0 100 ND 94 71-120 <br /> Methyl ten-butyl ether 112 1 0 100 10 102 70-122 <br /> Toluene 909 1 0 100 0 14 90 84-119 <br /> Xylenes(total) 279 1 0 300 ND 93 86-132 <br /> �urrogate Dibromofluoromethane 485 I, 5 00 97 84-122 <br /> Surrogate 12 Dichloroethane-d4 5 01 500 100 74-135 <br /> Surrogate Toluene-d8 4 79 500 96 84 119 <br /> Surrogate 4-Bromofluorobenzene 468 500 94 86-119 <br /> Matrix Spike Dup(5010287-MSDI) Source P501233-01 Prepared&Analyzed 41/26/05 <br /> Tert-amyl methyl ether 11 3 2 0 ugA 100 ND 113 78-117 6 20 <br /> Benzene 967 10 100 ND 97 81-118 5 20 <br /> Tert-butyl alcohol 224 40 200 ND 112 60 147 11 20 <br /> Di-isopropyl ether 100 2 0 100 ND 100 70-125 6 20 <br /> 1,2-Dibromoethane(EDB) 107 10 100 ND 107 85-125 7 20 <br /> 1,2-Dichloroethane 11 1 10 100 ND 111 77-126 7 20 <br /> Ethanol 218 200 200 ND 109 55-200 17 20 <br /> Ethylbenzene 9 75 10 100 ND 98 89-122 4 20 <br /> Ethyl tert-butyl ether 985 20 100 ND 98 71-120 5 20 <br /> Methyl tert-butyl ether 11 9 10 100 1 0 109 70-122 6 20 <br /> Toluene 9 72 10 100 0 14 96 84-119 7 20 <br /> Xylenes(total) 300 10 300 ND 100 86-132 7 20 <br /> Surrogate Dibromofluoromethane 4 78 500 96 84-122 <br /> Surrogate 12-Dichloroethane-d4 493 500 99 74-135 <br /> Surrogate Toluene-d8 477 500 95 84-119 <br /> Surrogate 4-Bromofluorobenzene 4 77 500 95 86 119 <br /> Sequoia Analytical-Petaluma The results to this report apply to the samples analyzed to 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 12 of 15 <br />