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819 Sinker Ave Ste 8 <br /> Sequoia- Sacramento,CA 95834 <br /> (916)921-9600 <br /> a— —N— <br /> Analytical FAX(916)921-0100 <br /> www sequoialabs com <br /> SECOR International-Rancho Cordova Project Tosco 1205,Lathrop,CA S211698 <br /> 30I7 Kilgore Road,Suite 100 Project Number N/A Reported <br /> Rancho Cordova CA,95670 Project Manager Rusty Benkosky 02/12/03 12 10 <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 Limtt Notes <br /> Batch 2120101-EPA 5030B(PIT] <br /> Blank 2120101-BLK2 Prepared&Analyzed 12/06/02 <br /> Surrogate 1 2-DCA-d4 259 ug/l 250 104 60-140 <br /> Laboratory Control Sample(2120101_-BS1) Prepared&Analyzed 12/05/02 <br /> Methyl tert-butyl ether 120 0 50 ugA 109 110 60-140 <br /> Benzene 7 81 0 50 6 70 117 70-130 <br /> Toluene 38 5 050 405 95 70-130 <br /> Gasoline(C6-CIO) 441 50 550 80 70-130 <br /> Surrogate Toluene-d8 261 15 0 104 60-140 <br /> Surrogate 4-BFB 294 25 0 118 60-140 <br /> Surrogate 12-DCA-d4 264 25 0 106 60-140 <br /> Laboratory Control Sample 2120101-BS2 Prepared&Analyzed 12/06/02 <br /> Methyl tert-butyl ether 11 6 050 ugl! 109 106 60-140 <br /> Benzene 8 11 050 6 70 121 70-130 <br /> Toluene 41 5 050 405 102 70-130 <br /> Gasoline(C6-C10) 408 50 550 74 70-130 <br /> Surrogate Toluene-d8 266 25 0 106 60-140 <br /> Surrogate 4-BFB 28 0 25 0 112 60-140 <br /> Surrogate 12-DCA-d4 256 25 0 102 60-140 <br /> Matrix Spike(2120101-MSI) Source 5211698-05 Prepared&Analyzed 12/05/02 <br /> Methyl tert-butyl ether 12 2 050 119/1 10 9 1 2 101 60-140 <br /> Benzene 7 82 050 6 70 ND 117 70-130 <br /> Toluene 405 050 405 0 98 98 70-130 <br /> Gasoline(C6-C10) 404 50 550 ND 73 60-140 <br /> Surrogate Toluene-d8 262 250 105 60-140 <br /> Surrogate 4-BFB 28 6 250 114 60-140 <br /> Surrogate 1 1-DCA-d4 263 25 0 105 60-140 <br /> Sequoia Analytical-Sacramento The results in this report apply to the mmples analyzed in accordance with the chain <br /> of custody document Unless otherwise stated results are reported on a wet weight • <br /> basis This analytical report must be reproduced in its entirety <br /> Page 8 of 10 <br />