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819 Striker Ave Ste 8 <br /> a_ _� Sequoia Sacramento CA 95834 <br /> (916)9219600 <br /> Analytical <br /> FAX 916 921 0100 <br /> Amk 1W www sequoialabs com <br /> 301 <br /> 30SECOR International-Rancho Cordova Project TOSCO 11193, Stockton,CA S304255 <br /> 17 Kilgore Road,Suite 100 Project Number N/A Reported <br /> Rancho Cordova CA,95670 Prosect Manager Rusty Benkosky 04/29/03 08 52 <br /> GasolineWEMOxygenates by EPA method 8260B- Quality Control <br /> Sequoia Analytical- Sacramento <br /> Reporting Spike Source %REC RPD <br /> Analyte Result Limit Units Level Result %R-EC Limits RPD Limit Notes <br /> Batch 3040319-EPA 5030B JP/Tl <br /> Laboratory Control Sample(3040319-BS2) Prepared 04/19/03 Analyzed 04/20/03 <br /> Surrogate Toluene-d8 242 ug/1 25 0 97 60-140 <br /> Surrogate 4-BFB 24 1 25 0 96 60-140 <br /> Matrix Spike(3040319-MS1) Source 5304255-10 Prepared&Analyzed 04/19/03 <br /> Benzene 16 2 0 50 ug/1 13 6 ND 119 70-130 <br /> Toluene 88 9 0 50 " 83 4 ND 107 70-130 <br /> Methyl tert-butyl ether 23 1 2 0 22 4 0 77 100 60-140 <br /> Gasoline(C6-C10) 1310 50 1100 ND 119 60-140 <br /> Surrogate Toluene-d8 252 250 101 60-140 <br /> Surrogate 4-BFB 239 250 96 60-140 <br /> Wtnx Spike Du 3040319-MSD1 Source 5304255-10 Prepared&Analyzed 04/19/03 <br /> Benzene 14 7 0 50 ug/1 13 6 ND 108 70-130 10 25 <br /> Toluene 80 6 0 50 83 4 ND 97 70-130 10 25 <br /> Methyl tert-butyl ether 246 2 0 224 0 77 106 60-140 6 25 <br /> Gasoline(C6-C10) I260 50 1100 ND 115 60-140 4 25 <br /> Surrogate Toluene-d8 238 250 95 60-140 <br /> Surrogate 4-BFB 244 25 0 98 60-140 <br /> Batch 3040335-EPA 5030E PIT <br /> Blank 3040335-BLK1 Prepared&Analyzed 04/19/03 <br /> Benzene ND 0 50 u9/1 <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-C10) ND 50 " <br /> Surrogate Toluene-d8 248 25 0 99 60-140 <br /> Surrogate 4-BFB 238 25 0 95 60-140 <br /> quoia Analytical-Sacramento The results in this report apply to the samples analyzed in accordance with the chain <br /> of custody document Unless otherwise slated, results are reported on a wet weight <br /> basis This analytical report must he reproduced in its entirety <br /> Page 13 of 19 <br />