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819 Striker Avenue Suite 8 <br /> Sacramento )9 95834 <br /> 9600 <br /> Sequoia Q (91619z 1 96ao <br /> 100 <br /> Analytical wwseqFAX 6ialabg om <br /> www seyuoialabs coni <br /> SECOR International-Rancho Cordova Project Tosco 1205,Lathrop,CA <br /> 3017 Kilgore Road,Suite 100 Project Number NIA Reported <br /> Rancho Cordova CA,95670 Project Manager Rusty Benkosky 06/14/02 11 28 <br /> BTEX 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 2060151 -EPA 5030B [PIT <br /> Matrix Spike Dup(2060151-MSD1) Source 5206079-15 Prepared 06/13/02 Analyzed 06/14/02 <br /> Methyl tett-butyl ether 526 050 ugll 545 ND 97 60-140 4 25 <br /> Benzene 324 050 335 ND 97 70-130 6 25 <br /> Toluene 178 050 202 ND 88 70-130 2 25 <br /> Gasoline(C6-C 10) 232 50 275 ND 84 60-140 5 25 <br /> Surrogate Toluene-d$ 252 25 0 101 60-140 <br /> Surrogate 4-BFB 332 250 133 60-140 <br /> Surrogate 12-DCA-d4 279 250 111 60-140 <br /> i <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 l 1 of 12 <br />