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i <br /> Sequoia 885 Jarvis Drive <br /> M <br /> organ Hill,CA 95037 <br /> Analytical (408) 00 <br /> FAX(408)782-6308 <br /> www.sequoialabs.clabs.com <br /> Secor-Rancho Cordova(ARCO) PrcjeCt:ARCO#2133, Stockton,CA MPC0947 <br /> 3017 Kilgore Rd. Suite 100 Project Number:77BP.52133.06.0002 Reported: <br /> Rancho Cordova CA,95670 Project Manager:Brian Carey 04/15/06 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 °/uREC Limits RPD Limit Notes <br /> Batch 6DO3001 -EPA 5030B PIT/EPA 8260B <br /> Blank(61303001-BLK1) Prepared&Analyzed: 04/03/06 <br /> tert-Amyl methyl ether ND 0.50 ugA <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-butyl ether ND 0.50 " <br /> Ethylbenzene ND 0.50 " <br /> Methyl cert-butyl ether ND 0.50 " <br /> Toluene ND 0.50 " <br /> * <br /> lenes(total) ND 0.50 <br /> ,=line Range Organics(C4-C12) ND 50 <br /> Surrogate:1,2-Dichloroethane-d4 4.85 5.00 97 80-135 <br /> Surrogate: Toluene-d8 4.80 5.00 96 70-130 <br /> Surrogate:Dibromofluoromethane 5.10 5.00 102 85-130 <br /> Surrogate:4-Bromofluorobenzene 4.48 5.00 90 60-115 <br /> Laboratory Control Sample(61303001-B51) Prepared&Analyzed:04/03/06 <br /> tert-Amyl methyl ether 15.4 0.50 ugh 16.3 94 65-135 <br /> Benzene 5.74 0.50 5.04 114 70-125 <br /> tert-Butyl alcohol 164 20 169 97 60-135 <br /> Di-isopropyl ether 16.2 0.50 16.2 100 70-130 <br /> 1,2-Dibromoethane(EDB) 16.4 0.50 16.6 99 85-125 <br /> 1,2-Dichloroethane 17.1 0.50 t5.5 110 75-125 <br /> Ethanol 166 300 165 101 15-150 PE <br /> Ethyl tert-butyl ether 16.6 0.50 16.4 101 65-130 <br /> Ethylbenzene 7.13 0.50 7.28 98 80-130 <br /> Methyl tert-butyl ether 7.75 0.50 7.84 99 50-140 <br /> Toluene 34.3 0.50 38.0 90 70-120 <br /> Xylenes(total) 40.3 0.50 40.8 99 85-125 <br /> Gasoline Range Organics(C4-C12) 434 50 440 99 75-140 <br /> Surrogate: 1,2-Dichloroethane-d4 5.20 5.00 104 80-135 <br /> Surrogate: Toluene-d8 5.22 5.00 104 70-130 <br /> Surrogate:Dibromofluoromethane 5.15 5.00 103 85-130 <br /> Surrogate:4-Bromofluorobenzene 4.76 5.00 95 60-115 <br /> �equoia 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,resudts are reported on a wet weight basis. <br /> This analytical report must be reproduced in its entirety. <br /> Page 13 of 19 <br />