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885larvis Drive <br /> Sequoia Morgan Hil, 95037 <br /> (408)772.9600 <br /> FAX 08Analy+isa1 wwwsequoialabs.00m <br /> • <br /> URS Corporation[Arcol] Project:ARCQ#5450,Stockton,CA MOE0229 <br /> 2870 Gateway Oaks Dr.,Ste 300 Project Number:GOBZN-0001 Reported, <br /> Sacramento CA,95833 Project Manager:Jeff Brooks 05/24/05 16:37 <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 5050103-EPA 5030B waters/EPA 8260B <br /> Blank(5050103-BLK1) Prepared&Analyzed:05/18/05 <br /> Tert-amyl methyl ether ND 1.0 ug/l <br /> Benzene ND 0.50 " <br /> Teri-butyl alcohol ND 20 <br /> Di-isopropyl ether ND 1.0 " <br /> 1,2-Dibromoethane(EDB) ND 0.50 " <br /> 1,2-Dichloroethane ND 0.50 " <br /> Ethanol ND 100 " <br /> Ethylbenzene ND 0.50 " <br /> Ethyl tent-butyl ether ND 1.0 " <br /> Methyl tert-butyl ether ND 0.50 " <br /> Toluene ND 0.50 " <br /> Xylenes(total) ND 0.50 " <br /> i%prDurrogate:Dibromofluoromethane 5.35 5.00 107 84-122 <br /> Surrogate:1,2.Dichloroethane-d4 5.60 5.00 111 74-135 <br /> Surrogate:Toluene-d8 5.12 5.00 102 84-119 <br /> Surrogate:4-8romofluorobenzene 5.54 5.00 111 86-119 <br /> Laboratory Control Sample(5050103-BS1) Prepared&Analyzed:05/18/05 <br /> Tert-amyl methyl ether 5.41 1.0 ug/l 5.00 108 78-117 <br /> Benzene 5.04 0.50 5.00 101 81-118 <br /> Tert-butyl alcohol 113 20 100 113 60-147 <br /> Di-isopropyl ether 5.52 l.0 5.00 110 70-125 <br /> 1,2-Dibromoethane(EDB) 5.51 0.50 5.00 110 85-125 <br /> 1,2-Dichlomethane 6.05 0.50 5.00 121 77-126 <br /> Ethanol 398 100 100 398 55-200 HL <br /> Ethylbenzene 5.28 0.50 5.00 106 89-122 <br /> Ethyl tert-butyl ether 5.40 1.0 5.00 108 71-120 <br /> Methyl tert-butyl ether 5.72 0.50 5.00 114 70-122 <br /> Toluene 5.30 0.50 5.00 106 84-119 <br /> Xylenes(total) 16.1 0.50 15.0 107 86-132 <br /> Surrogate:Dibromofluoromethane 5.30 5.00 106 84-111 <br /> Surrogate:l,2-Dichloroethane-d4 5.49 5.00 110 74-135 <br /> Surrogate:Toluene-d8 5.16 5.00 103 84-119 <br /> Surrogate:4-Bromofluorobenzene 5.30 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 7 of 9 <br />