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.� 885 Jarvis Dr <br /> Sequoia Morgan Hill,CA 95037 <br /> Analytical FAX(408408)7 782 6308 <br /> www sequoealabs can <br /> Secor-Rancho Cordova Project ARCO#595,Stockton,CA MMA0549 <br /> 3017 Kilgore Rd Suite 100 Project Number ARCO#595,Stockton,CA Reported <br /> Rancho Cordova CA,95670 Project Manager Rusty Benkosky 02/25/03 10 42 <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 Limit Notes <br /> Batch 3A31001-EPA 5030BJP/Tl <br /> Blank(3A31001-BLK1) Prepared&Analyzed 01/31/03 <br /> Gasoline Range Organics(C6-C10) ND 50 ug/l <br /> Benzene ND 050 " <br /> Toluene ND 050 " <br /> Ethylbenzene ND 050 " <br /> Xylenes(total) ND 050 " <br /> Methyl cert-butyl ether ND 25 " <br /> Surrogate a a a-Tris luorotoluene 897 100 897 55-142 <br /> Laboratory Control Sample(3A31001-BSI) Prepared&Analyzed 01/31/03 <br /> Benzene 836 050 ug/l 100 83 6 68-140 <br /> Toluene 846 0 50 100 84 6 76 127 <br /> Qthylbenzrne 849 050 100 84 9 77-130 <br /> ylenes(total) 262 0 50 300 873 78-128 <br /> Surrogate a a a-TriJluorotoluene 885 100 885 55-142 <br /> Laboratory Control Sample(3A31001-BS2) Prepared&Analyzed 01/31/03 <br /> Gasoline Range Organics(C6-C 10) 276 50 ug/l 250 110 62-134 <br /> Surrogate a a a-Tri luorotoluene 919 11100 92 9 55-142 <br /> Matrix Spike(3A31001-MSI) Source MMA0549-12 Prepared 01/31/03 Analyzed 02/01/03 <br /> Gasoline Range Organics(C6-C 10) 524 50 ug/l 550 ND 95 3 62-134 <br /> Benzene 10 9 050 6 80 ND 160 68-140 QM-07 <br /> Toluene 373 050 410 ND 91 0 76-127 <br /> Ethylbenzene 855 050 9 80 ND 87 2 77-130 <br /> Xylenes(total) 446 050 479 ND 931 78-128 <br /> Surrogate a a a-Trtfluorotoluene 997 100 98 7 55-142 Q-23a <br /> Matrix Spike Dup(3A31001-MSDI) Source MMA0549-12 Prepared 01/31/03 Analyzed 02/01/03 <br /> Gasoline Range Organics(C6 CI0) 477 50 ug/l 550 ND 86 7 62 134 939 41 <br /> Benzene 103 0 50 6 80 ND 151 68-140 566 30 QM-07 <br /> equoia Analytical-Morgan Hill The results in this report apply to the samples analyzed to accordance with the chain of <br /> custody document Unless otherwise stated results are reported on a wet weight bases <br /> This analytical report must be reproduced in its entirety <br /> 13 of 22 <br />