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Sequoia Morgan <br /> Jarvis Drive <br /> Hill,CA 95037 <br /> (408)776-9600 <br /> Analytical FAX(406)782-6309 <br /> wwwsequoialabs.coabs.com <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 %REC Limits RPD Limit Notes <br /> Batch 5C21005-EPA 5030B PIT/EPA 8260B <br /> Laboratory Control Sample(5C21005-BS1) Prepared&Analyzed:03/21/05 <br /> Toluene 9.00 0.50 ug/I 10.0 90 85-120 <br /> Xylenes(total) 28.2 0.50 30.0 94 85-125 <br /> Surrogate:1,2-Dichtoroethane-d4 4.49 5.00 90 60-135 <br /> Laboratory Control Sample(5C21005-BS2) Prepared&Analyzed:03/21/05 <br /> Benzene 5.28 0.50 ug/l 6.40 82 65-115 <br /> Ethylbenzene 7.22 0.50 7.52 96 75-135 <br /> Methyl tert-butyl ether 8.62 0.50 9.92 87 65-125 <br /> Toluene 29.4 0.50 31.9 92 85-120 <br /> Xylenes(total) 38.2 0.50 36.6 104 85-125 <br /> Gasoline Range Organics(C4-C 12) 394 50 440 90 70-124 <br /> Surrogate:1,2-Dichloroethane-d4 4.02 5.00 80 60-135 <br /> . Laboratory Control Sample Dup(5C21005-BSD1) Prepared&Analyzed:03/21/05 <br /> tent-Amyl methyl ether 11.0 0.50 ug/1 10.0 Ito 80-115 6 15 <br /> Benzene 10.0 0.50 10.0 100 65-115 9 20 <br /> tent-Butyl alcohol 48.0 20 50.0 96 75-150 2 25 <br /> Di-isopropyl ether 11.2 0.50 10.0 112 75-125 7 15 <br /> 1,2-Dibromoethane(EDB) 9.97 0.50 10.0 100 85-120 4 15 <br /> 1,2-Dichloroethane 12.0 0.50 10.0 120 85-130 13 20 <br /> Ethanol 173 100 200 86 70-135 8 35 <br /> Ethyl tert-butyl ether 11.4 0.50 10.0 114 75-130 10 25 <br /> Ethylbenzene 10.0 0.50 10.0 100 75-135 12 15 <br /> Methyl tert-butyl ether 11.3 0.50 10.0 113 65-125 8 20 <br /> Toluene 9.80 0.50 10.0 98 85-120 9 20 <br /> Xylenes(total) 30.8 0.50 30.0 103 85-125 9 20 <br /> Surrogate:l,2-Dichloroethane-d4 4.85 5.00 97 60-135 <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 15 of 17 <br />