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Dr <br /> Sequoia M 885 Jarvis ap�ii Hilf,CA 4503737 <br /> Analytical (408)776-9600 <br /> FAX(408)782-6308 <br /> www sequoialabs can <br /> Sector-Rancho Cordova Project ARCO#4932,Stockton,CA MMB0227 <br /> 3017 Kilgore Rd Suite 100 Project Number ARCO#4932,Stockton,CA Reported <br /> Rancho Cordova CA,95670 Project Manager Rusty Benkosky 02/25/03 11 03 <br /> Total Purgeable Hydrocarbons (C6-C10) by EPA 8015B modified, BTEXM by EPA 8021B- Quality Control <br /> Sequoia Analytical-Morgan Hill <br /> Reporting Spike Source %REC RPD <br /> Analyte Result Limit Units Level Result %REC Limits RPD Linut Notes <br /> Batch 3B11005-EPA 5030B [P/TI <br /> MatnxSpike Du (31111005-MSD1) Source Prepared 02/11/03 Analyzed 02/12/03 <br /> Toluene 39 9 050 ug/l 410 10 949 76-127 199 30 <br /> Ethylbenzene 108 050 980 056 104 77 130 000 21 Q-23a <br /> Xylenes(total) 497 050 479 ND 104 78-128 140 21 Q-23 <br /> Surrogate a a a-Trifluorotoluene 13 3 100 133 55-142 Q-lab <br /> Batch 3B12002-EPA 503011JP/TI <br /> Blank(31312002-BLKI) Prepared&Analyzed 02/12/03 <br /> Gasoline Range Organics(C6-C 10) ND 50 ug/1 <br /> Benzene ND 050 <br /> Toluene ND 050 " <br /> cylbenwne ND 0 50 " <br /> lenes(total) ND 0 50 <br /> Methyl tent-butyl ether ND 25 " <br /> Surrogate a a a-Trti luorotoluene 101 100 101 55-142 0-09 <br /> Laboratory Control Sample(3B12002-BS1) Prepared&Analyzed 02/I2/03 <br /> Benzene 880 050 u8A 100 88 0 68-140 <br /> Toluene 881 0 50 100 <br /> 881 76-127 <br /> Ethylbenzene 960 050 100 96 0 77-130 <br /> Xylenes(total) 278 050 300 927 78-128 <br /> Surrogate a aa-Trti luorotoluene 101 100 101 55-142 0-09 <br /> Laboratory Control Sample(3BI2002-BS2) Prepared&Analyzed 02/12/03 <br /> Gasoline Range Organics(C6-CI0) 246 50 ug/l 250 98 4 62-134 - <br /> Surrogate a a a-Trifluorotoluene 10 7 100 107 55-142 0-09 <br /> quota Analytical-Morgan Hill The results in this report apply to the samples analyzed in accordance with the chain of <br /> custody document Unless otherwise stated results are reported on a wet weight basis <br /> This analytical report must be reproduced in its entirety <br /> 13 of 21 <br />