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85 <br /> Sequo• 8Hil,CA Drive <br /> ia Morgan Hill,CA 95037 <br /> (408)776-9500 <br /> Analytical <br /> FAX(408)782-6308 <br /> www.sequoialabs.com <br /> • <br /> Secor-Rancho Cordova(ARCO) Project: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 %REC Limits RPD Limit Notes <br /> Batch 6DO5004-EPA 5030B P/T 1 EPA 8260B <br /> Matrix Spike(6D05004-MSI) Source:WC0935-01 Prepared&Analyzed:04/05/06 <br /> tert-Amyl methyl ether 78.8 2.5 ug/l 81.6 ND 97 65-135 <br /> Benzene 27.3 2.5 25.2 ND 108 70-125 <br /> tert-Butyl alcohol 741 100 844 ND 88 60-135 <br /> Di-isopropyl ether 89.5 2.5 81.2 ND 110 70-130 <br /> 1,2-Dibromoethane(EDB) 73.2 2.5 83.2 1.8 86 85-125 <br /> 1,2-Dichloroethane 88.4 2.5 77.6 ND 114 75-125 <br /> Ethanol 1000 1500 824 ND 121 15-150 <br /> Ethyl tert-butyl ether 88.0 2.5 82.0 ND 107 65-130 <br /> Ethylbenzene 34.8 2.5 36.4 ND 96 80-130 <br /> Methyl tert-butyl ether 63.4 2.5 39.2 17 118 50-140 <br /> Toluene 152 2.5 190 ND 80 70-120 <br /> � <br /> enes(total) 200 2.5 204 ND 98 85-125 <br /> aline Range Organics(C4-C 12) 4170 250 2200 2600 71 75-140 LN <br /> Surrogate: 1,2-Dichloroethane-d4 2.59 2.50 104 80-135 <br /> Surrogate: Toluene-d8 2.14 1.50 86 70-130 <br /> Surrogate:Dibromofluoromethane 2.55 2.50 101 85-130 <br /> Surrogate:4-Bromofluorobenzene 2.33 2.50 93 60-115 <br /> Matrix Spike Dup(6D05004-MSD1) Source: MPC0935-01 Prepared&Analyzed:04/05/06 <br /> ter[-Amy]methyl ether 78.0 2.5 ug/l 81.6 ND 96 65-135 1 25 <br /> Benzene 24.0 2.5 25.2 ND 95 70-125 13 15 <br /> tert-Butyl alcohol 768 100 844 ND 91 60-135 4 35 <br /> Di-isopropyl ether 89.8 2.5 81.2 ND 111 70-130 0.3 35 <br /> 1,2-Dibromoethane(EDB) 85.6 2.5 83.2 1.8 101 85-125 16 15 RB <br /> 1,2-Dichloroethane 77.4 2.5 77.6 ND 100 75-125 13 10 RB <br /> Ethanol 1080 1500 824 ND 131 15-150 8 35 <br /> Ethyl tert-butyl ether 85.0 2.5 „ 82.0 ND 104 65-130 3 35 <br /> Ethylbenzene 36.1 2.5 36.4 ND 99 80-130 4 15 <br /> Methyl tent-butyl ether 60.8 2.5 39.2 17 112 50-140 4 25 <br /> Toluene 184 2.5 190 ND 97 70-120 19 15 RB <br /> Xylenes(total) 205 2.5 204 ND 100 85-125 2 15 <br /> Gasoline Range Organics(C4-C12) 4420 250 2200 2600 83 75-140 6 20 <br /> Surrogate: 1,2-Dichloroethane-d4 2.23 2.50 89 80-135 <br /> Surrogate: Toluene-d8 2.49 2,50 100 70-130 <br /> Surrogate:Dibromofluoromethane 1.32 " 2.50 93 85-130 <br /> Surrogate:4-Bromofluorobenzene 2.49 2.50 100 60-115 <br /> equoia Analytical -Morgan Hill Theresults in this report apply to the samples analyzed in accordance withthe chain of <br /> j custody document. Unless otherwise slated,results are reported on a wet weight basis. <br /> This analytical report must be reproduced in its entirety. <br /> Page 16 of 19 <br />