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• 885 Jarvis Drive <br /> a- ) Sequoia FAX Ola Morgan Hill,CA 95037 <br /> Analytical (408776-9600 <br /> iqW (408))762-6308 <br /> www.scquoialabs.com <br /> i <br /> SeCOr-Rancho Cordova(ARCO) Project:ARCO#2133, Stockton,CA MPC0947 <br /> 3017 Kilgore Rd. Suite 100 Project Nwnber:77BP.52133.06.0002 Reported: <br /> Rancho Cordova CA,95670 Project Manager:Brian Carey 04/15/06 12:28 <br /> Volatile Organic Compounds by EPA Method 8260B- Quality Control <br /> Sequoia Analytical- Morgan Hill <br /> Reporting Spike Source %REC RPD <br /> Analyte Result Limit Units Level Result %REC Limits RPD Limit Notes <br /> Batch 6DO5004-EPA 5030B P/T/EPA 8260B <br /> Blank(6D05004-BLKI) Prepared&Analyzed:04/05/06 <br /> tert-Amyl methyl ether ND 0.50 ug/1 <br /> Benzene ND 0.50 " <br /> tert-Butyl alcohol ND 20 " <br /> Di-isopropyl ether ND 0.50 <br /> 1,2-Dibromoethane(EDB) ND 0.50 " <br /> 1,2-Dichloroethane ND 0.50 " <br /> Ethanol ND 300 <br /> Ethyl tert-butyl ether ND 0.50 " <br /> Ethylbenzene ND 0.50 " <br /> Methyl tert-butyl ether ND 0.50 <br /> Toluene ND 0.50 " <br /> lenes(total) ND 0.50 " <br /> soline Range Organics(C4-C12) ND 50 " <br /> Surrogate: l,2-Dichloroethane-d4 2.36 2.50 94 80-135 <br /> Surrogate: Toluene-d8 2.23 2.50 89 70-130 <br /> Surrogate:Dibromofluoromethane 2.25 2.50 90 85-130 <br /> Surrogate:4-Bromofluorobenzene 2.26 2.50 90 60-115 <br /> Laboratory Control Sample(6D05004-BS1) Prepared&Analyzed:04/05/06 <br /> tert-Amyl methyl ether 16.2 0.50 ugll 16.3 99 65-135 <br /> Benzene 4.88 0.50 5.04 97 70-125 <br /> tert-Butyl alcohol 151 20 169 89 60-135 <br /> Di-isopropyl ether 15.6 0.50 16.2 96 70-130 <br /> 1,2-Dibromoethane(EDB) 16.2 0.50 16.6 98 85-125 <br /> 1,2-Dichloroethane 16.0 0.50 15.5 103 75-125 <br /> Ethanol 179 300 165 108 15450 <br /> Ethyl tert-butyl ether 15.9 0.50 16.4 97 65-130 <br /> Ethylbenzene 6.82 0.50 7.28 94 80-130 <br /> Methyl tert-butyl ether 7.56 0.50 " 7.84 96 50-140 <br /> Toluene 33.4 0.50 " 38.0 88 70-120 <br /> Xylenes(total) 39.8 0.50 " 40.8 98 85-125 <br /> Gasoline Range Organics(C4-C12) 467 50 440 106 75-140 <br /> Surrogate: l,2-Dichloroethane-d4 2.35 2.50 94 80-135 <br /> Surrogate: Toluene-d8 216 2.50 90 70-130 <br /> Surrogate:Dibromofluoromethane 2.26 " 2.50 90 85-130 <br /> Surrogate:4-Bromofluorobenzene 2.37 112.50 95 60-115 <br /> �equoia 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 15 of 19 <br />