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Hi 8Jarvis Drive <br /> Sequoia Morgan Hill,CA 95037 <br /> (408)776-9600 <br /> a- -) <br /> Analytical FAX(408)782-6308 <br /> www.sequoialabs.com <br /> URS Corporation[Arco II Project:ARCO#0595,CA MPA0032 <br /> 2870 Gateway Oaks Dr.,Ste 300 Project Number:GOBZG-0002 Reported: <br /> Sacramento CA,95833 Project Manager:Vemon P.Elarth 01/06/06 11:40 <br /> Volatile Organic Compounds by EPA Method 8260B - Quality Control <br /> Sequoia Analytical - Morgan Hill <br /> Reporting Spike Source '%REC RPD <br /> :�nahtc Result Limit Units Level Result %REC Limits RPD Limit Notes <br /> Batch 6AO4046-EPA 5030B P/T/EPA 8260B <br /> Matrix Spike Dup(6AO4046-MSD1) Source:MPA0032-01 Prepared&Analyzed:01/04/06 <br /> tert-Amyl methyl ether 0.0159 0.0050 mg/kg 0.0150 0.00018 105 80-130 2 25 <br /> Benzene 0.00524 0.0050 0.00516 ND 102 65-125 5 20 <br /> tert-Butyl alcohol 0.162 0.020 0.143 0.0024 112 80-135 8 20 <br /> Di-isopropyl ether 0.0176 0.0050 0.0151 ND 117 85-115 6 20 HL <br /> 1,2-Dibromoethane(EDB) 0.0163 0.0050 0.0149 ND 109 85-130 7 15 <br /> 1,2-Dichloroethane 0.0158 0.0050 0.0147 ND 107 63-124 7 25 <br /> Ethanol 0.273 0.10 0.142 ND 192 35-150 7 40 HL,IC <br /> Ethyl tert-butyl ether 0.0162 0.0050 0.0150 ND 108 80-125 8 25 <br /> Ethylbenzene 0.00727 0.0050 0.00754 ND 96 80-135 1 20 <br /> Methyl tert-butyl ether 0.00719 0.0050 0.00702 ND 102 75-115 6 35 <br /> Toluene 0.0321 0.0050 0.0372 ND 86 85-125 10 15 <br /> Xylenes(total) 0.0427 0.0050 0.0412 ND 104 80-140 3 20 <br /> Gasoline Range Organics(C4-C12) 0.499 0.10 0.440 ND 113 53-126 9 25 <br /> Surrogate:1,1-Dichloroethane-d4 0.00417 0.00500 83 60-115 <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 12 of 13 <br />