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,Z_ (4885 Jarvis Drive <br /> Sequoia Morgan Hill,CA 95037 <br /> Analytical FAX <br /> 08)776.9640 <br /> (448)782-6308 <br /> wwwsequoialabs.com <br /> URS Corporation[Arcoll Project:ARCO 45450,Stockton,CA MOE0229 <br /> 2870 Gateway Oaks Dr.,Ste 300 Project Number:GOBZN-0001 Reported: <br /> Sacramento CA,95833 Project Manager:JelfBrooks 05/24/05 16:37 <br /> Volatile Organic Compounds by EPA Method 8260B- Quality Control <br /> Sequoia Analytical -Petaluma <br /> Reporting Spike Source 0/.RFC RPD <br /> Analyte Result Limit Units Level Result °/aREC Limits RPD Limit Notes <br /> Batch 5050103-EPA 50308 waters 1 EPA 8260B <br /> Matrix Spike(5050103-MS1) Source:P505105-09 Prepared&Analyzed:05/18/05 <br /> Tert-amy]methyl ether 4,60 1.0 ug/l 5.00 ND 92 78-117 <br /> Benzene 4.69 0.50 5.00 ND 94 81-118 <br /> Tert-butyl alcohol 106 20 100 ND 106 60-147 <br /> Di-isopropyl ether 4.71 1.0 5.00 ND 94 70-125 <br /> 1,2-Dibromoethane(EDB) 5.12 0,50 5.00 ND 102 85-125 <br /> 1,2-Dichloroethane 5.19 0.50 5.00 ND IN 77-126 <br /> Ethanol 67.4 100 100 ND 67 55-200 <br /> Ethylbenzene 5.69 0.50 5.00 ND 114 89-122 <br /> i <br /> Ethyl ten-butyl ether 4.23 1.0 5.00 ND 85 71-120 <br /> Methyl Cert-butyl ether 4.35 0.50 5.00 ND 87 70-122 <br /> Toluene 4.76 0.50 5.00 ND 95 84-119 <br /> A9111LXylenes(total) I6.5 0.50 15.0 ND 110 86-132 <br /> Surrogate:Dibromofluoromethane 4.70 5.00 94 84-111 <br /> Surrogate'1,2-Dichloroethane-d4 5.40 5.00 108 74-135 <br /> Surrogate:Toluene-d8 4.99 5.00 100 84-119 <br /> Surrogate:4-Bromofluorobenzene 5.38 5.00 108 86-119 <br /> Matrix Spike Dup(5050103-MSD1) Source:P505105-09 Prepared&Analyzed:05/18/05 <br /> Tert-amyl methyl ether 4.72 1.0 ug/l 5.00 ND 94 78-117 3 20 <br /> Benzene 4.60 0.50 5.00 ND 92 81-118 2 20 <br /> Tert-butyl alcohol 133 20 t00 ND 133 60-147 23 20 RB <br /> Di-isopropyl ether 4.62 1.0 5.00 ND 92 70-125 2 20 <br /> 1,2-Dibromoethane(EDB) 5.26 0.50 5.00 ND 105 85-125 3 20 <br /> 1,2-Dichloroethane 5.10 0.50 5.00 ND 102 77-126 2 20 <br /> Ethanol 265 100 100 ND 265 55-200 119 20 LM <br /> Ethylbenzene 5.30 0.50 5.00 ND 106 89-122 7 20 <br /> Ethyl tert-butyl ether 4.28 1.0 5.00 ND 86 71-120 1 20 <br /> Methyl ten-butyl ether 4.56 0.50 5.00 ND 91 70-122 5 20 <br /> Toluene 4.79 0.50 5.00 ND 96 84-119 0.6 20 <br /> Xylenes(total) 16.0 0.50 15.0 ND 107 86-132 3 20 <br /> Surrogate:Dibromofluoromethane 4.85 5.00 97 84-111 <br /> Surrogate:1,1-Dichloroethane-d4 5.33 5.00 107 74-135 <br /> Surrogate:Toluene-d8 5.01 5.00 100 84-119 <br /> Surrogate:4-Bromofluorobenzene 5.29 5.00 106 86-119 <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 entirety, <br /> Page 8 of 9 <br /> i <br />