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G) (40885 Jarvis Drive <br /> Sequoia Morgan Hill,CA 95037 <br /> A <br /> 8)700 <br /> Analytical <br /> FAX(408)7882-632-6308 <br /> www.sequoialabs.com <br /> • <br /> Secor-Rancho Cordova(ARCO) Project:ARCO#2133,Stockton,CA MPC0947 <br /> 3017 Kilgore Rd. Suite 100 Project Nuntber: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 %REC Limits RPD Limit Notes <br /> Batch 6DO5005- EPA 5030B PIT/EPA 8260B <br /> Matrix Spike(6D05005-MSI) Source: MPC0849-12RE1 Prepared&Analyzed:04/05/06 <br /> tert-Amyl methyl ether 80.6 2.5 ug/l 81.6 1.4 97 65-135 <br /> Benzene 30.4 2.5 " 25.2 4.4 103 70-125 <br /> tert-Butyl alcohol 1000 100 " 844 60 111 60-135 <br /> Di-isopropyl ether 83.8 2.5 81.2 ND 103 70-130 <br /> 1,2-Dibromoethane(EDB) 79.0 2.5 83.2 ND 95 85-125 <br /> 1,2-Dichloroethane 73.7 2.5 77.6 ND 95 75-125 <br /> Ethanol 1210 1500 824 190 124 15-150 PE <br /> Ethyl tert-butyl ether 89.2 2.5 82.0 ND 109 65-130 <br /> Ethylbenzene 56.4 2.5 36.4 23 92 80-130 <br /> Methyl tert-butyl ether 46.0 2.5 39.2 6.7 100 50-140 <br /> Toluene 215 2,5 190 32 96 70-120 <br /> � <br /> enes(total) 448 2.5 " 204 270 87 85-125 <br /> oline Range Organics(C4-C 12) 4170 250 2200 1600 117 75-140 <br /> Surrogate: l,2-Dichloroethane-d4 2.58 2.50 103 80-135 <br /> Surrogate: Toluene-d8 2.39 2.50 96 70-130 <br /> Surrogate:Dibromofluoromethane 2.34 2.50 94 85-130 <br /> Surrogate:4-Bromofluorobenzene 2.36 2.50 94 60-115 <br /> Matrix Spike Dup(6D05005-MSD1) Source: MPC0849-12RE1 Prepared&Analyzed: 04/05/06 <br /> tert-Amyl methyl ether 81.0 2.5 ug/1 81.6 1.4 98 65-135 0.5 25 <br /> Benzene 29.2 2.5 25.2 4,4 98 70-125 4 15 <br /> tert-Butyl alcohol 1030 100 844 60 115 60-135 3 35 <br /> Di-isopropyl ether 84.2 2.5 81.2 ND 104 70-130 0.5 35 <br /> 1,2-Dibromoethane(EDB) 78.8 2.5 83.2 ND 95 85-125 0.3 15 <br /> 1,2-Dichloroethane 71.1 2.5 77.6 ND 92 75-125 4 10 <br /> Ethanol 1030 1500 824 190 102 15-150 16 35 PE <br /> Ethyl tert-butyl ether 89.2 2.5 82.0 ND 109 65-130 0 35 <br /> Ethylbenzene 55.1 2.5 36.4 23 88 80-130 2 15 <br /> Methyl tert-butyl ether 46.2 2.5 39.2 6.7 101 50-140 0.4 25 <br /> Toluene 211 2.5 190 32 94 70-120 2 15 <br /> Xylenes(total) 436 2.5 204 270 81 85-125 3 15 LN <br /> Gasoline Range Organics(C4-C12) 4100 250 2200 1600 114 75-140 2 20 <br /> Surrogate:l,2-Dichloroethane-d4 2.51 2.50 100 80-135 <br /> Surrogate:Toluene-d8 2.40 2.50 96 70-130 <br /> Surrogate:Dibromofluoromethane 2.28 2.50 91 85-130 <br /> Surrogate:4-Bromofluorobenzene 2.40 2.50 96 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,results are reported on a wet weight basis. <br /> This analytical report must be reproduced in its entirety. <br /> Page 18 of 19 <br />