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Sequoia Walnut <br /> N WiLane <br /> t Creels CAA 94598 <br /> (925)988-9600 <br /> Analytical www <br /> 98&9673 <br /> sequoequolalabs coin <br /> Secor-Rancho Cordova Project Arco <br /> 3017 Kilgore Rd, Ste #100 Project Number Arco#595, Stockton Reported <br /> Rancho Cordova CA,95670 Project Manager Clint Harms 07-Aug-01 13 12 <br /> Volatile Organic Compounds by EPA Method 826013 - 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 1G27018- EPA 5030B(MeOH) <br /> LCS(1G27018-BSI) Prepared 26-Jul-01 Analyzed 27-1u1-Ol <br /> Methyl tent-butyl ether 247 020 mg/kg 250 988 70-130 <br /> Surrogate Dibromofluoromeihane 2 57 <br /> 250 103 50-150 <br /> Surrogate 1,2-Dichloroethane-d4 246 250 984 50-150 ' <br /> LCS(1G27018-BS2) Prepared 26-Jul-01 Analyzed 28-Jul-01 <br /> Methyl tert-butyl ether_ 213 _ 020 mg/kg 250 _ 852 70-130 <br /> Surrogate Dibromofluoromethane 239 250 956 50-150 <br /> Surrogate 12-Dichlaroethane-d4 246 250 984 50-150 <br /> LCS(1G27018-BS3) Prepared 31-Ju1-01 Analyzed 01-Aug-01 <br /> -- -—_ - - <br /> Methyl tert-butyl ether - - ---- 2 89 -0-20— mg/kg 250 116 70-136 <br /> Surrogate Dibromofluoromethane 240 150 960 50-150 <br /> Surrogate 1 2-Dichloroethane-d4 239 250 95 6 50-150 � ' <br /> Matrix Spike(1G27018-MSI) Source W107294-01 Prepared 26-Jul-01 Analyzed 28-Jul-01 <br /> Methyl tert-butyl ether 1 98 020 mg/l g 250 ND 7Q 2 60-140 <br /> Surrogate Dtbromafluoromethane '2 21- 250 884 50-150 T <br /> Surrogate 1 1-Dichloroethane-d4 224 250 896 50-150 <br /> Matrix Spike(1G27018-MS2) - _ Source W107334-01 Prepared 26-Jul-O! Analyzed 28-Jul-01 <br /> Methyl tert-butyl ether - 231 020 mg/kg 250 ND 924 60-140 <br /> Surrogate Dibromofluoromethane 2 46 2 50 98 4 50-150 <br /> Surrogate 1 2-Dichloroethane-d4 140 150 960 50-150 <br /> Matrix Spike Dup(1G27018-MSD1) Source W107294-01 Prepared 26-Jul-OI Analyzed 28-Jul-Ol <br /> Methyl tert-butyl ether 262 020 mg/kg 250 ND 105 60-140 278 25 Q-07 <br /> Surrogate Dibromofluoromethane 256 250 102 50-150 _ <br /> Surrogate 1,1-Dichloroethane-d4 252 250 101 50-150 <br /> Sequoia Analytical- Walnut Creek The results in this report apply to the samples analyzed in accordance with the chain o <br /> custody document This analytical report must be reproduced in its entirip <br /> Page 13 of 15 <br />