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885 Jarvis Drive <br /> Sequoia Morgan Hill,CA 95037 <br /> (408)776-9600 <br /> Analytical <br /> FAX(408)782-6308 <br /> www.sequoWabs.com <br /> Secor-Rancho Cordova(ARCO) Project:ARCO#2133, Stockton,CA MPC0947 <br /> 3017 Kilgore Rd. Suite 100 Project Number:7713P.5213 3,06-0002 Reported: <br /> Rancho Cordova CA,95670 Project Manager:13rian Carey 04115/06 12:28 <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 6DO5005-EPA 5030B PIT I EPA 8260B <br /> Blank(6D05005-BLKI) Prepared&Analyzed: 04/05/06 <br /> tert-Amyl methyl ether ND 0.50 ugll <br /> Benzene ND 0.50 " <br /> tert-Butyl alcohol ND 20 " <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 300 PE <br /> Ethyl tert-butyi ether ND 0.50 " <br /> Ethylbenzene ND 0.50 " <br /> Methyl tent-butyl ether ND 0.50 " <br /> Toluene ND 0.50 " <br /> lenes(total) ND 0.50 <br /> IIIIPksolinc Range Organics(C4-C12) ND 50 " <br /> Surrogate, 1,2-Dichloroethane-d4 2.77 2.50 111 80-135 <br /> Surrogate: Toluene-d8 2.23 2.50 89 70-130 <br /> Surrogate:Dibromofluoromethane 2.63 2.50 105 85-130 <br /> Surrogate:4-Bromofluorobenzene 1.98 2.50 79 60-115 <br /> Laboratory Control Sample(6D05005-BSI) Prepared&Analyzed: 04/05/06 <br /> tert-Amyl methyl ether 15.3 0.50 ug(! 16.3 94 65-135 <br /> Benzene 4.95 0.50 5.04 98 70-125 <br /> tert-Butyl alcohol 192 20 169 114 60-135 <br /> Di-isopropyl ether t5.9 0.50 16.2 98 70-130 <br /> 1,2-Dibromoethane(EDB) 15.4 0.50 16.6 93 85-125 <br /> 1,2-Dichloroethane 149 0.50 15.5 96 75-125 <br /> Ethanol 268 300 165 162 15-150 HL,PE <br /> Ethyl tert-butyl ether 17.1 0.50 16.4 104 65-130 <br /> Ethylbenzene 6.57 0.50 7.28 90 80-130 <br /> Methyl tert-butyl ether 7.43 0.50 7.84 95 50-140 <br /> Toluene 35.1 0.50 38.0 92 70-120 <br /> Xylenes(total) 37.0 0.50 40.8 91 85-125 <br /> Gasoline Range Organics(C4-C 12) 487 50 440 111 75-140 <br /> Surrogate: l,2-Dichloroethane-d4 2,65 2.50 106 80-135 <br /> Surrogate: Toluene-d8 2.39 2.50 96 70-130 <br /> Surrogate:Dibromofluoromethane 2.41 2.50 96 85-130 <br /> Surrogate:4-Bromofluorobenzene 2.40 2.50 96 60-115 <br /> joequoia 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 17 of 19 <br />