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Sequoia 6l,CA95037 <br /> Magpn Hill,CA95037 <br /> a— —N `408)7 -9608 <br /> Analytical <br /> FAX(406)78282-6308 <br /> www sequoialabs cmwdft <br /> Secor-Rancho Cordova Project ARCO 4595,Stockton,CA MMA0549 <br /> 3017 Kilgore Rd Suite 100 Pr4lect 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 50308 [PIT] <br /> Matrix Spike Dup(3A31001-MSD1) Source MMA0549-12 Prepared 01/31/03 Analyzed 02/01/03 <br /> Toluene 363 050 ug/l 410 ND 885 76-127 272 30 <br /> Ethylbenzene 801 050 980 ND 81 7 77-130 652 21 <br /> Xylenes(total) 422 050 479 ND 881 78-128 553 21 <br /> Surrogate a a a-Trifluorotoluene 908 100 908 55-742 Q-23a <br /> Batch 3A31002-EPA 5030B [P/TJ <br /> Blank(3A31002-BLKI) 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 tert-butyl ether ND 25 " <br /> Surrogate a a a-Triuorotoluene 967 100 967 55-142 <br /> Laboratory Control Sample(3A31002-BS1) Prepared&Analyzed 01/3I/03 <br /> Benzene v 791 050 ug/l 100 _ 791 68-140 <br /> Toluene 801 050 100 80 1 76-127 <br /> Ethylbenzene 899 050 100 899 77-130 <br /> Xylenes(total) 261 050 300 870 78 128 <br /> 100 985 55-142 <br /> Laboratory Control Sample(3A31002-BS2) Prepared&Analyzed 01/31/03 <br /> Gasolme Range Organics(C6-C 10) 274 -50 ug/l 250 110 62-134 <br /> Surrogate_a a a-Trifluorotoluene __ -__ _ 104 _ 100_ _ 104_ 55 142 <br /> Sequoia 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 /> 14 of 22 <br />