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r r / <br /> 1 <br /> ' S <br /> (D (92404 N Wiget Lane <br /> Sequoia Walnut Creek,CA 94598 <br /> N <br /> 5)988 9600 <br /> Analytical FAX(925)988 9673 <br /> www� oialabscan <br /> 5ecor-Rancho Cordova Project Arco <br /> 3017 Kilgore Rd,Ste #100 Project Number Arco#2133,Stockton Reported <br /> Rancho Cordova CA,95670 Project Manager Rusty Benkosky 14-Aug-02 13 16 <br /> Volatile Organic Compounds by EPA Method 8260B- Quality Control <br /> Sequoia Analytical -Walnut Creek <br /> Reporting Spike Source %REC RPD <br /> Analyte Result Limit Units Level Result %REC Limits RPD Limit Notes <br /> Batch 2HO5003-EPA 5030B(MeOH <br /> LCS(2H05003-BS1) Prepared&Analyzed 05-Aug-02 <br /> l,l-Dichloroethene 239 020 mg/kg 250 956 65-135 <br /> Methyl tert-butyl ether(MTBE) 212 020 250 848 70-130 <br /> Benzene 2 08 0 20 250 83 2 70-130 <br /> Trichloroethene 2 09 0 25 250 83 6 70-130 <br /> Toluene 214 050 2 50 85 6 70-130 <br /> Chlorobenzene 2 32 010 2 50 928 70-130 <br /> Surrogate Dibromoflunromethane 232 250 928 50-150 <br /> Surrogate 1 2-Dtchloroethane-d4 251 250 100 50-150 <br /> Surrogate Toluene-d8 2 81 250 112 50-150 <br /> Surrogate 4-Bromofluorobenzene 2 75 250 110 50-150 <br /> Matrix Spike(2H05003-MSI) Source W208041-02 Prepared&Analyzed 05-Aug-02 <br /> 1,1-Dichloroethene 228 020 mg/kg 250 ND 91 2 60-140 <br /> . Methyl tort-butyl ether(MTBE) 218 020 " 250 ND 87 2 60-150 <br /> Benzene 211 020 2 50 ND 844 60-140 <br /> Tnehloroethene 2 18 0 25 250 ND 872 60-140 <br /> Toluene 232 0 50 250 ND 928 60-140 <br /> Chlorobenzene 235 0 10 250 ND 940 60-140 <br /> Surrogate Dibromofluoromethane 232 250 92 8 50-150 <br /> Surrogate 12-Dichloroethane-d4 2 71 250 108 50-150 <br /> Surrogate Toluene-0 2 92 250 117 50.150 <br /> Surrogate 4-Bromofluorobenzene 277 250 111 50-150 <br /> Matrix Spike Dup(21-105003-MSDI) Source W208041-02 Prepared&Analyzed 05-Aug-02 <br /> I,1-Dichloroethene 2 64 020 mg/kg 250 ND 106 60-140 14 6 25 <br /> Methyl tent-butyl ether(MTBE) 2 59 020 250 ND 104 60-150 17 2 25 <br /> Benzene 248 020 2 50 ND 992 60-140 161 25 <br /> Trichloroethene 260 025 2 50 ND 104 60-140 176 25 <br /> Toluene 259 050 250 ND 104 60-140 I 1 0 25 <br /> Chlorobenzene 266 0 10 2 50 ND 106 60-140 124 25 <br /> Surrogate Dibromofluoromethane 133 250 931 50-750 <br /> Surrogate 1 2-Dichloroethane-d4 2 78 2.50 111 50=150 <br /> Surrogate Toluene-d8 296 250 118 k-150 <br /> Surrogate 4-Bromofluorobenzene 2 76 250 110 50-150 <br /> Sequoia Analytical-Walnut Creek The results to this report apply to the samples analyzed to accordance with the chain of <br /> custody document This analytical report must be reproduced to its entirety <br /> Page 17 of 20 <br />