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Sequoia Sacracrammaenttoo Ave Ste B <br /> CA 95834 <br /> 12) 00 <br /> Analytical <br /> n alyti cal (96)921 0 NO <br /> FAX{916}921 OI0 <br /> www sequotalabs com <br /> SECOR International-Rancho Cordova Project TOSCO 11193,Stockton,CA S304255 <br /> 3017 Kilgore Road,Suite 100 Project Number N/A Reported <br /> Rancho Cordova CA,95670 Project Manager Rusty Benkosky 04/29/03 08 52 <br /> Gasoline\BTEXIOxygenates by EPA method 8260B-Quality Control <br /> Sequoia Analytical Sacramento <br /> Reporting Spike Source %REC RAD <br /> Analyte Result Limit Units Level Result %REC Limits RPD Limit Notes <br /> Batch 3040335-EPA 5030B [P/T1 <br /> Blank(3040335-BLK2) Prepared&Analyzed 04/21/03 <br /> Benzene ND 0 50 ug/I <br /> Toluene ND 0 50 " <br /> Ethylbenzene ND 0 50 " <br /> Xylenes(total) ND 0 50 " <br /> Methyl tert-butyl ether ND 2 0 " <br /> Gasoline(C6-CIO) ND 50 <br /> Surrogate Toluene-d8 - 246 - 25 0 98 60-140- - - <br /> Surrogate 4-BFB 242 25 0 97 60-140 <br /> Laboratory Control Sample(3040335-BS1) Prepared 04/19/03 Analyzed 04/20/03 <br /> Benzene 14 9 0 50 ug/1 13 6 110 70-130 <br /> Toluene 824 0 50 83 4 99 70-130 <br /> Methyl tert-butyl ether 270 2 0 " 22 4 121 60-140 <br /> --Gasoline(C6-C10)____ _ r 1190_ __ _= 50--- _',_ --- -_1100 ,._ _ __log__ 70-130___ <br /> Surrogate Toluene-d8 242 25 0 97 60-140 <br /> Surrogate 4-BFB m _ -24 1 - 25 0 - _ G_96 60-140 <br /> Laboratory Control Sample(3040335-BS2 Prepared&Analyzed 04/21/03 <br /> Benzene 15 1 0 50 119/1 13 6 111 70-130 <br /> Toluene 87 2 050 83 4 105 70-130 <br /> Methyl tert-butyl ether 22 8 2 0 22 4 102 60-140 <br /> Gasoline(C6-C10) 1420 50 1100 129 " 70-130 <br /> i <br /> Surrogate Toluene-d8 25 7 25 0 103 60-140 <br /> Surrogate 4-BFB 249 250 100 60-140 <br /> Matnx Spike 3040335-MS1 Source 5304294-02 Prepared 04/21/03 Analyzed 04/22/03 <br /> Benzene 15 2 050 ugtl 13 6 ND 112 70-130 <br /> Toluene 82 9 050 83 4 ND 99 70-130 <br /> Methyl tert-butyl ether 24 5 2 0 22 4 ND 309 60-140 <br /> Gasoline(C6-Cl 0) 1250 .50 1100 63 108 60-140 <br /> Surrogate Toluene-d8 25 1 - 25 0 100 60-140 <br /> Sequoia Analytical-Sacramento The results in this report apply to the samples 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 14 of 19 <br />