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_ 8Hi 1,CA Drive3 <br /> Sequoia Morgan(408)776-9600 <br /> Analytical FAX(408) 08 <br /> wtvtvsequoialabs.clabs.com � <br /> URS Corporation[Arcol] Project:ARCO#2168,Stockton,CA MQK0321 <br /> 2870 Gateway Oaks Dr.,Ste 300 Project Number.GOC81-0010 Reported: <br /> Sacramento CA,95833 Project Manager:Vernon P.Elarth 11/23/05 12:41 <br /> Volatile Organic Compounds by EPA Method 8260B- Quality Control <br /> Sequoia Analytical-Morgan Hill <br /> F Reporting Spike Source %REC RPD <br /> Analyte Result Limit Units Level Result %REG Limits RPD Limit Notes <br /> Batch 5K16007-EPA 50351 EPA 8260B <br /> Matrix Spike Dup(5K16007-MSD1) Source:MOK0689-01 Prepared&Analyzed: I 1/16/05 <br /> tort-Amyl methyl ether 0.0142 0.0050 mg/kg 0.0150 0.00015 94 80-130 9 25 <br /> Benzene 0.00447 0.0050 0.00516 ND 87 65-125 11 20 <br /> tort-Butyl alcohol 0.136 0.020 0.143 ND 95 80-135 6 20 <br /> Di-isopropyl ether 0.0146 0.0050 0.0151 ND 97 85-115 10 20 <br /> 1,2-Dibromoethane(EDB) 0.0131 0.0050 0.0149 ND 88 85-130 14 15 <br /> 1,2-Dichloroethane 0.0130 0.0050 0.0147 ND 88 63-124 22 25 <br /> Ethanol 0.141 0.10 0.142 0.026 81 35-150 24 40 IC <br /> Ethyl tert-butyl ether 0.0145 0.0050 0.0150 ND 97 80-125 11 25 <br /> Ethylbenzene 0.00563 0.0050 0.00754 ND 75 80-135 17 20 LN <br /> ! _+ Methyl tert-butyl ether 0.00650 0.0050 0.00702 ND 93 75-115 20 35 <br /> Toluene 0.0275 0.0050 0.0372 0.00021 73 85-125 9 15 LN <br /> Xylenes(total) 0.0319 0.0050 0.0412 0.00072 76 80-140 14 20 LN <br /> r Gasoline Range Organics(C4-C12) 0.749 0.10 0.440 0.71 9 53-126 26 25 LN,BA <br /> f Surrogate:1,2-Dichloroethane-d4 0.00436 0.00500 87 60-125 <br />' r <br /> it <br /> I <br /> 1 {^ <br /> 1 EEti <br /> P' + <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 11 of 12 <br /> i <br /> 1 <br />