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l <br /> GSequoia 885 Jarvis Drive <br /> ) Morgan Hill,CA 95037 <br /> Analytical (408)776-9600 <br /> FAX(408)782-6308 <br /> www.scquoialabs.com <br /> URS Corporation[Arcot] Project:ARCO#2168,Stockton,CA MOK0900 <br /> 2870 Gateway Oaks Dr.,Ste 300 Project Number:GOC 81-0010 <br /> ' Reported: <br /> f Sacramento CA,95833 Project Manager:Vernon P.Elarth 11/30/05 12:28 <br /> I � <br /> Volatile Organic Compounds by EPA Method 8260B - Quality Control <br /> Sequoia Analytical-Morgan Hill <br /> k <br /> f <br /> Anal Reporting Spike Source %REC RPD <br /> Result Limit Units Level Result %REC Limits RPD Limit Notes <br /> Batch 5K23041 -EPA 50351 EPA 8260B <br /> Laboratory Control Sample Dup(5K23041-BSD1) Prepared&Analyzed: 11/23/05 <br /> Cert-Amyl methyl ether 0.0163 0.0050 mg/kg 0.0150 109 80-130 2 25 <br /> Benzene 0.00533 0.0050 0.00516 103 65.125 0 20 <br /> 3 tert-Butyl alcohol0.1 „ <br /> 58 0.020 0143 1I0 80-165 2 25 <br /> Di-isopropyl ether 0.0164 0.0050 0.0151 109 85-115 0.6 20 <br /> 1,2-Dibromoethane(EDB) 0.0165 0.0050 0.0149 111 85-130 1 15 <br /> 1,2-Dichloroethane 0.0167 0.0050 0.0147 114 63-124 5 25 <br /> Ethanol 0.177 0.10 " 0.142 125 35-150 17 40 <br /> FEthyl tert-butyl ether 0.0163 0.0050 " 0.0150 109 80-125 1 25 <br /> Ethylbenzene 0.00678 0.0050 0.00754 90 80-135 0.7 20 <br /> , Methyl tert-butyl ether „ <br /> 0.00761 0.0050 4.00702 108 75-115 7 35 <br /> Toluene 0.0362 0.0050 0.0372 97 85-125 0.6 15 <br /> Xylenes(total) 0.0394 0.0050 0.0412 96 80-140 0.5 20 f� <br /> Gasoline Range Organics(C4-C12) 0.515 0.10 0.440 117 53-126 2 25 <br /> Surrogate.,1,2-Dichloroethane-d4 0.00419 0.00500 84 60-125 <br /> Batch 5K28012-EPA 5035/EPA 8260B <br /> Blank(5K28012-BLK1) Prepared&Analyzed: 11/28/05 <br /> tert-Amyl methyl ether ND 0.0050 mg/kg <br /> Benzene ND 0.0050 <br /> s. tert-Butyl alcohol ND 0.020 " <br /> Di-isopropyl ether ND 0.0050 " <br /> 1,2-Dibromoethane(EDB) ND 0.0050 <br /> 1,2-Dichloroethane ND 0.0050 <br /> t <br /> Ethanol ND <br /> 0.10 <br /> F, Ethyltert-butyl ether ND 0.0050 <br /> Ethylbenzene ND 0.0050 <br /> ! # Methyl tert-butyl ether ND 0.0050 i <br /> Toluene ND 0.0050 " <br /> Xylenes(total) ND 0.0050 <br /> Gasoline Mange Organics(C4-C12) ND 0.10 <br /> r <br /> Surrogate:l,2-Dichloroethane-d4 0.00461 0.00500 92 60-125 <br /> F 1 <br /> s <br /> Sequoia Analytical-Morgan Hill The results in this report apply to the samples analyzed in accordance with h the chain of <br /> custody document. Unless otherwise staled,results are reported on a wet weight basis. !` <br /> This analytical report must be reproduced in its entirety. <br /> i <br /> Page 9of12 <br />