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885 Jarvis Drive <br /> Sequoia Morgan Hill,CA 95037 <br /> (408)776-9600 <br /> Analytical FAX782-6308 <br /> W ww,sequoequoialabs.com <br /> i <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 Managcr: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 SC18007- EPA 5030E P/T/EPA 8260E <br /> Laboratory Control Sample(5C18007-BS2) Prepared&Analyzed:03/18/05 <br /> Benzene 4.74 0.50 ug/1 6.40 74 65-115 <br /> Ethylbenzene 8.36 0.50 7.52 111 75-135 <br /> Methyl tert-butyl ether 6.94 0.50 9.92 70 65-125 <br /> Toluene 31.8 0.50 31.9 100 85-120 <br /> Xylenes(total) 43.1 0.50 36.6 118 85-125 <br /> Gasoline Range Organics(C4-C12) 375 50 440 85 70-124 <br /> Surrogate: 1,2-Dichloroethane-d4 4.05 5.00 81 60-135 <br /> Laboratory Control Sample Dup(508007-13SD1) Prepared&Analyzed: 03/18/05 <br /> tert-Amyl methyl ether 10.6 0.50 ug/l 10.0 106 80-115 0 15 <br /> Benzene 9.51 0.50 10.0 95 65-115 4 20 <br /> tert-Butyl alcohol 47.1 20 50.0 94 75-150 0.8 25 <br /> Di-isopropyl ether 10.9 0.50 'I 10.0 109 75-125 2 15 <br /> 1,2-Dibromoethane(EDB) 9.61 0.50 10.0 96 85-120 2 15 <br /> 1,2-Dichloroethane 10.8 0.50 10.0 108 85-130 7 20 <br /> Ethanol 182 100 200 91 70-135 2 35 <br /> Ethyl tert-butyl ether 10.9 0.50 10.0 109 75-130 2 25 <br /> Ethylbenzene 9.48 0.50 10.0 95 75-135 4 15 <br /> Methyl tent-butyl ether 10.6 0.50 10.0 106 65-125 3 20 <br /> Toluene 9.47 0.50 10.0 95 85-120 2 20 <br /> Xylenes(total) 29.6 0.50 30.0 99 85-125 5 20 <br /> Surrogate:1,2-Dichloroethane-d4 4.78 5.00 96 60-135 <br /> Matrix Spike(5CI8007-MSI) Source: M00O299-01 Prepared&Analyzed:03/18/05 <br /> Benzene 6.07 0.50 ug/1 6.40 ND 95 65-115 <br /> Ethylbenzene 8.64 0.50 7.52 ND 115 75-135 <br /> Methyl ten-butyl ether 9.23 0.50 9.92 0.12 92 65-125 <br /> Toluene 34.2 0.50 31.9 0.19 107 85-120 <br /> Xylenes(total) 44.9 0.50 36.6 ND 123 85-125 <br /> Gasoline Range Organics(C4-C12) 439 50 440 24 94 70-124 <br /> Surrogate:1,2-Dichloroethane-d4 4.07 5.00 81 60-135 <br /> i <br /> i <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 13 of 17 <br />