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n Hi la Drive <br /> Sequoia Morgan Hili,CAA 95037 <br /> a_ (408)776-9600 <br /> Analytical FAX(408)782-6308 <br /> www.scquoialabs.com <br /> Secor-Rancho Cordova(ARCO) Project:ARCO#4932,Stockton,CA MOG0595 <br /> 3017 Kilgore Rd.Suite 100 Project Number:GOC813-0001 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 %REC Limits RPD Limit Notes <br /> Batch 5G25012-EPA 5030B P/T I EPA 8260B <br /> Blank(5G25012-BLK2) Prepared&Analyzed:07/25/05 <br /> Toluene ND 0.50 ug/I <br /> Xylenes(total) ND 0.50 " <br /> Gasoline Range Organics(C4-Cl2) ND 50 " <br /> Surrogate:l,2-Dichloroethane-d4 6.15 5.00 123 60-135 <br /> Laboratory Control Sample(5G25012-BS1) Prepared&Analyzed:07/25/05 <br /> tert-Amyl methyl ether 10.1 0.50 ugfl 10.0 101 80-115 <br /> Benzene 9.59 0.50 10.0 96 65-115 <br /> tert-Butyl alcohol 45.4 20 50.0 91 75-150 <br /> Di-isopropyl ether 8.91 0.50 10.0 89 75-125 <br /> 1,2-Dibmmoethane(EDB) 8.50 0.50 10.0 85 85-120 <br /> 1,2-Dichloroethane 9.53 0.50 10.0 95 85-130 <br /> Ethanol 138 100 200 69 70-135 HM,IC <br /> Ethyl tert-butyl ether 8.80 0.50 10,0 88 75-130 <br /> Ethylbenzene 8.81 0.50 10.0 88 75-135 <br /> Methyl tert-butyl ether 9.18 0.50 10.0 92 65-125 <br /> Toluene 8.89 0.50 10.0 89 85-120 <br /> Xylenes(total) 29.9 0.50 30.0 96 85-125 <br /> Surrogate:1,2-Dichloroethane-d4 5.46 5.00 109 60-135. <br /> Laboratory Control Sample(5G25012-BS2) Prepared&Analyzed:07/25/05 <br /> Benzene 5.23 0.50 u8A 6.08 86 65-115 <br /> Ethylbettzene 6.85 0.50 7.84 87 75-135 <br /> Methyl tert-butyl ether 8.73 0.50 9.60 91 65-125 <br /> Toluene 33.1 0.50 32.9 101 85-120 <br /> Xylenes(total) 37.1 0.50 38.5 96 85-125 <br /> Gasoline Range Organics(C4-C12) 469 50 440 107 70-124 <br /> Surrogate:1,2-Dichloroethane-l4 6.15 5.00 123 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 20 of 27 <br />