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819 Sinker Avenue Suite 8 <br /> Sequoia Sacramento9 — <br /> KD— (916 <br /> )921 9600 9600 <br /> Analytical FAX(916)921 0100 <br /> qwwww sequoialabs com <br /> SECQR International-Rancho Cordova Project Tosco 1205,Lathrop,CA <br /> 3017 Kilgore Road, Suite 100 Project Number N/A 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 %RRC Limits RPD Limit Notes <br /> Batch 2060151 -EPA 5030B [P/TI <br /> Matrix Spike Dup(2060151-MSD1) Source 5206079-15 Prepared 06/13/02 Analyzed 06/14/02 <br /> Methyl tert-butyl ether 526 050 ug/l 545 ND _ 97 60-140 4 25 <br /> Benzene 324 050 3 35 ND Q7 70-130 6 25 <br /> Toluene 178 050 202 ND 88 70-130 2 25 <br /> Gasoline(C6-CIO) 232 50 275 ND 84 60-140 5 25 <br /> Surrogate Toluene-d8 252 250 101 60-140 <br /> Surrogate 4-BFB 332 250 133 60-140 <br /> Surrogate 12-DCA-d4 279 250 112 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 11 of 12 <br />