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Drive <br /> JarvisSequoia Morgan Hill,CA 93037 <br /> (408)776.9500 <br /> a- )i Analytical FAX(409)782-66308 <br /> www.sequoialabs.com <br /> Secor-Rancho Cordova(ARCO) Project:ARCO#4932,Stockton,CA MOG0595 <br /> 3017 Kilgore Rd.Suite 100 Project Number:GOCBD-0001 Reported: <br /> Rancho Cordova CA,95670 Project Manager:Clinton Harms 08/01/05 11:10 <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 %PEC Limits RPD Limit Notes <br /> Batch 5G26006-EPA 5030B PIT/EPA 8260B <br /> Laboratory Control Sample(5G26006-BSI) Prepared&Analyzed:07/26/05 <br /> Cert-Amyl methyl ether 10.4 0.50 ug/l 10,0 104 80-115 <br /> Benzene 9.57 0.50 10.0 96 65-115 <br /> tert-Butyl alcohol 49.3 20 50.0 99 75-150 <br /> Di-isopropyl ether 9.31 0.50 10.0 93 75-125 <br /> 1,2-Dibromoethane(EDB) 8.09 0.50 10.0 81 85-120 RM <br /> 1,2-Dichloroethane 8.08 0.50 10.0 81 85-130 HM <br /> Ethanol 123 100 200 62 70-135 HM,IC <br /> Ethyl tert-butyl ether 9.02 0.50 10.0 90 75-130 <br /> Ethylbenzene 8.40 0.50 10.0 84 75-135 <br /> Methyl tert-butyl ether 8,88 0.50 10.0 89 65-125 <br /> Toluene 8.69 0.50 10.0 87 85-120 <br /> -Xylenes(total) 26.5 0.50 30.0 88 85-125 <br /> Surrogate:1,1-Dichloroethane-d4 4.98 5.00 100 60-135 <br /> Laboratory Control Sample(5G26006-BS2) Prepared&Analyzed:07/26/05 <br /> Benzene 5.19 0.50 ugll 6.08 85 65-115 <br /> Ethylbenzene 6.89 0.50 7.84 88 75-135 <br /> Methyl tert-butyl ether 8.12 0.50 9.60 85 65-125 <br /> Toluene 31.4 0.50 32.9 95 85-120 <br /> Xylenes(total) 38.3 0.50 38.5 99 85-125 <br /> Gasoline Range.Organics(C4-C 12) 443 50 440 101 70-124 <br /> Surrogate:1,1-Dichforoethane-d4 5.21 5.00 104 60-135 <br /> Laboratory Control Sample Dup(5G26006-BSD1) Prepared&Analyzed:07/26/05 <br /> cert-Amyl methyl ether 10.7 0.50 ugH 10.0 107 80-115 3 15 <br /> Benzene 9.94 0.50 10.0 99 65-115 4 20 <br /> tert-Butyl alcohol 48.6 20 50.0 97 75-150 1 25 <br /> Di-isopropyl ether 9.44 0.50 10.0 94 75-125 1 15 <br /> 1,2-Dibromoethane(EDB) 8.78 0.50 10.0 88 85-120 8 15 <br /> 1,2-Dichloroethane 10.2 0.50 10,0 102 85-130 23 20 BA <br /> Ethanol 125 100 200 62 70-135 2 35 HM <br /> Ethyl tert-butyl ether 9.60 0.50 10.0 96 75-130 6 25 <br /> Ethylbenzene 9.22 0.50 10.0 92 75-135 9 15 <br /> Methyl tent-butyl ether 9.76 0.50 " Mo 98 65-125 9 20 <br /> Toluene 9.51 0.50 10.0 95 85-120 9 20 <br /> Xylenes(total) 29.7 0.50 30.0 99 85-125 11 20 <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 states(,results are reported on a wet weight basis. <br /> This analytical report must he reproduced in its entirety. <br /> Page 23 of 27 <br />