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819 Striker Avenue Suite 8 <br /> Sacramento )9 95834 <br /> Sequoia q (916)92 1-9600 <br /> FAX 100 <br /> Analytical wwseq 6ialabs om <br /> www sequo�alabs com <br /> SECOR International-Rancho Cordova Project TOSCO 8671,Stockton,CA <br /> 3017 Kilgore Road,Suite 100 ProjeclNumber NIA Reported <br /> Rancho Cordova CA,95670 Protect Manager Rusty Benkosky 01/14/02 15 16 <br /> Volatile Organic Compounds by EPA Method 8260B - Quality Control <br /> Sequoia Analytical - Sacramento <br /> Reporting Spike Source %REC RPD <br /> Analyte Result Limit Units Level Result %REC Limits RPD Limit Notes <br /> Batch 1120289-EPA 50308 [PIT] <br /> L,CS(1 120289-BS 1) Prepared&Analyzed 12/26/01 <br /> Methyl tert-butyl ether 232 050 u9/1 250 92 8 60-140 <br /> Surrogate 1 2-DCA-d4 290 11250 116 60-140 <br /> Matrix Spike(1120289-MS1) Source 5112176-07 Prepared&Analyzed 12/26/01 <br /> Methyl tert-butyl ether 240 050 ug/l 250 ND 960 60-140 <br /> Surrogate 1 2-DCA-d4 289 11250 116 60-140 <br /> Matrix Spike Dup(1120289-MSD]) Source 5112176-07 Prepared&Analyzed 12/26/01 <br /> Methyl tert-butyl ether 219 050 ug/1 250 ND 876 60-140 9 15 25 <br /> Surrogate 1 2-DCA-d4 288 250 115 60-140 <br /> •Sequoia Analytical-Sacramento The results in this report apply to the samples analyzed in accordance with the chain of <br /> custody document This analytical report must be reproduced in its entirety <br /> Page Page 23 of 27 <br />