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1 <br /> 865 Jarvis Drive <br /> Sequoia Morgan Hill,CA 95037 <br /> (408)776-9600 <br /> Analytical FAX 782-6308 <br /> w ww.se q equoi uoi a l a b s.co i n <br /> Secor-Rancho Cordova(ARCO) Project:ARCO#2133,Stockton,CA M00O299 <br /> 3017 Kilgore Rd.Suite 100 Project Number:N/p Reported: <br /> Rancho Cordova CA,95670 Project Manager:Rusty Benkosky 03/23/05 13:43 <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 %aREC Limits RPD Limit Notes <br /> Batch 5C18007- EPA 5030B PIT/EPA 8260B <br /> Matrix Spike Dup(5CI8007-MSDI) Source: M00O299-01 Prepared&Analyzed:03/18/05 <br /> Benzene 5.99 0.50 ugll 6.40 ND 94 65-115 1 20 <br /> Ethylbenzene 8.43 0.50 7.52 ND 112 75-135 2 15 <br /> Methyl tett-butyl ether 9.53 0.50 9.92 0.12 95 65-125 3 20 <br /> Toluene 34.2 0.50 31.9 0.19 107 85-120 0 20 <br /> Xylenes(total) 43.3 0.50 36.6 ND 118 85-125 4 20 <br /> Gasoline Range Organics(C4-Cl2) 414 50 440 24 89 70-t24 6 20 <br /> Surrogate 1,2-Dichloroethane-d4 4,10 5.00 82 60-135 <br /> Batch 5C21005- EPA 5030B PIT 1 EPA 8260B <br /> Blank(5C21005-BLKI) Prepared&Analyzed:03/21/05 <br /> tert-Amyl methyl ether ND 0.50 ug/t <br /> Benzene ND 0.50 " <br /> tett-Butyl alcohol ND 5.0 <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 100 " <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 /> Xylenes(total) ND 0.50 " <br /> Gasoline Range Organics(C4-Cl2) ND 50 " <br /> Surrogate:1,2-Dichloroethane-d4 4?4 5.00 85 64-135 <br /> Laboratory Control Sample(5C21005-BSI) Prepared&Analyzed: 03/21/05 <br /> tert-Amyl methyl ether 10.4 0.50 ug/I 10.0 104 80-115 <br /> Benzene 9.10 0.50 10.0 91 65-115 <br /> tert-Butyl alcohol 48.8 20 50.0 98 75-150 <br /> Di-isopropyl ether 10.4 0.50 10.0 104 75-125 <br /> 1,2-Dibromoethane(EDB) 9.59 0.50 10.0 96 85-120 <br /> 1,2-Dichloroethane 10.5 0.50 10.0 105 85-130 <br /> Ethanol 187 100 200 94 70-135 <br /> Ethyl ten-butyl ether 10.3 0.50 10.0 103 75-130 <br /> Ethylbenzene 8.89 0.50 10.0 89 75-135 <br /> Methyl tert-butyl ether 10.4 0.50 10.0 104 65-125 <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 14 of 17 <br />