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l <br /> 885 Jarvis Dr <br /> Sequoia Morgan Hill,CA 95037 <br /> Analytical (408)776.9600 <br /> FAX(408)782 6308 <br /> www sequoialabs cqnMk <br /> Secor-Rancho Cordova Project ARCO#{4932,Stockton,CA MLK0836 <br /> 3017 Kilgore Rd Suite 100 Project Number ARCO#4932,Stockton,CA Reported <br /> Rancho Cordova CA,95670 Project Manager Rusty Benkosky 12/20/02 08 11 7 <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 %RBC Limits RPD Limit Notes <br /> Batch 2K26031 -EPA 5035 <br /> Matrix Spike(2K26031-MSI) Source MLK0869-01 Prepared 11/26/02 Analyzed 11/27/02 <br /> Methyl tert-butyl ether 31 1 14 ug/kg 279 ND 111 60-140 <br /> Benzene 284 14 279 ND 101 60-140 <br /> Toluene 283 14 279 2 3 932 60-140 <br /> Surrogate 12-Dichloroethane-d4 485 500 970 60-140 <br /> Matrix Spike(2K26031-MS2) Source MLK0836-01 Prepared 11/26/02 Analyzed 11/27/02 <br /> Methyl tert-butyl ether 280 1 8 ug/kg 296 ND 946 60-140 <br /> Benzene 161 1 8 186 ND 856 60-140 <br /> Toluene 123 is 112 ND 110 60-140 <br /> Gasoline Range Organics(C6-C 10) 1260 350 1550 ND 813 60-140 <br /> Surrogate 12-Dtchloroethane-d4 458 500 916 60-140 <br /> Matrix Spike Du (2K26031-MSD1) Source MLK0869-01 Prepared 11/26/02 Analyzed 11/27/02 <br /> Methyl"-butyl ether 31 6 14 ug/kg 279 ND 113 60-140 159 25 <br /> Benzene 283 14 279 ND 101 60-140 0 353 25 <br /> Toluene 282 14 279 23 92 8 60-140 0 354 25 <br /> Surrogate 11-Dtchloroethane-d4 4 85 500 970 60-140 <br /> Matrix Spike Da (2K26031-MSD2) Source MLK0836-01 Prepared 11/26/02 Analyzed 11/27/02 <br /> Methyl tert-butyl ether 268 18 ug/kg 296 ND 905 60-140 4 38 25 <br /> Benzene 151 1 8 186 ND 80 2 60-140 641 25 <br /> Toluene 113 18 112 ND 101 60-140 847 25 <br /> Gasoline Range Organics(C6-C10) 1220 350 1550 ND 787 60-140 323 25 <br /> Surrogate 12-Dichloroethane-d4 466 500 93 2 60-140 <br /> Sequoia 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 6 of 7 <br />