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885 Jarvis Drive <br /> Sequoia Morgan Hill,CA 95037 <br /> Analytical (408)776-9600 <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 Numbev77BP.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 %R]C RPD <br /> Analyte Result Limit Units Level Result %REC Limits RPD Limit Notes <br /> Batch 6DO3001 -EPA 5030B PIT I EPA 8260B <br /> Matrix Spike(6D03001-MS1) Source:MPC0824-01 Prepared&Analyzed:04/03/06 <br /> tert-Amyl methyl ether 148 5.0 ug/l 163 ND 91 65-135 <br /> Benzene 69.3 5.0 50.4 15 108 70-125 <br /> tert-Butyl alcohol 1710 200 1690 ND 101 60-135 <br /> Di-isopropyl ether 166 5.0 162 ND 102 70-130 <br /> 1,2-Dibromoethane(EDB) 159 5.0 166 ND 96 85-125 <br /> 1,2-Dichloroethane 166 5.0 155 ND 107 75-125 <br /> Ethanol 1830 3000 " 1650 ND 111 15-150 PE <br /> Ethyl tert-butyl ether 166 5.0 164 ND 101 65-130 <br /> Ethylbenzene 108 5.0 72.8 35 100 80-130 <br /> Methyl tert-butyl ether 95.7 5.0 78.4 23 93 50-140 <br /> Toluene 332 5.0 380 4.2 86 70-120 <br /> � <br /> epes(total) 459 5.0 408 34 104 85-125 <br /> oline Range Organics(C4-C12) 4990 500 4400 420 104 75-140 <br /> Surrogate:l,1-Dichloroethane-d4 5.16 5.00 103 80-135 <br /> Surrogate: Toluene-d8 4.88 5.00 98 70-130 <br /> Surrogate:Dibromofluoromethane 4.88 5.00 98 85-130 <br /> Surrogate:4-Bromofluorobenzene 4.86 5.00 97 60-115 <br /> Matrix Spike Dup(6D03001-MSD1) Source:MPCO824-01 Prepared&Analyzed: 04/03/06 <br /> tert-Amyl methyl ether 153 5.0 ug/l 163 ND 94 65-135 3 25 <br /> Benzene 69.8 5.0 50.4 15 109 70-125 0.7 15 <br /> tert-Butyl alcohol 1770 200 1690 ND 105 60-135 3 35 <br /> Di-isopropyl ether 166 5.0 162 ND 102 70-130 0 35 <br /> 1,2-Dibromoethane(EDS) 161 5.0 166 ND 97 85-125 1 15 <br /> 1,2-Dichloroethane 167 5.0 155 ND 108 75-125 0.6 10 <br /> Ethanol 1980 3000 1650 ND 120 15-150 8 35 PE <br /> Ethyl tert-butyl ether 165 5.0 164 ND 101 65-130 0.6 35 <br /> Ethylbenzene 111 5.0 72.8 35 104 80-130 3 15 <br /> Methyl tent-butyl ether 99.0 5.0 78.4 23 97 50-140 3 25 <br /> Toluene 336 5.0 380 4.2 87 70-120 1 15 <br /> Xylenes(total) 464 5.0 408 34 105 85-125 1 15 <br /> Gasoline Range Organics(C4-C12) 4880 500 4400 420 101 75-140 2 20 <br /> Surrogate: 1,1-Dichloroethane-d4 5.00 5.00 100 80-135 <br /> Surrogate: Toluene-d8 4.97 5.00 99 70-130 <br /> Surrogate:Dibromofluoromethane 5.01 5.00 100 85-130 <br /> Surrogate:4-Bromofluorobenzene 4.75 5.00 95 60-115 <br /> �quoia 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 14 of 19 <br />