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a— ) <br /> t455 Dowell Blvd North Ste D <br /> McDowellSequoia P�aluma�CA 94954 <br /> (TO7)79218b5 <br /> Analytical FAX(707)792 0342 <br /> www sequoialabs com <br /> URS Corp-Sacramento Project Arco Site 2093,Tracy,CA P306156 <br /> 2870 Gateway Oaks Dnve Suite 300 Project Number WR36588 Reported <br /> Sacramento CA,95833 Project Manager Vernon]? Elarth 06/25/03 17 01 <br /> Total Petroleum Hydrocarbons as Gasoline and BTEX by EPA 8015BI8021B - Quality Control <br /> Sequoia Analytical-Petaluma <br /> Reporting Spike Source %REC RPD <br /> Analyte Result Limit Units Level Result %REC Limits RPD LuEut Notes <br /> Batch 3060348-EPA 5030,waters <br /> Blank(3060348-BLKI) Prepared&Analyzed 06/16/03 <br /> Gasoline Range Organics ND 50 ug/1 <br /> Benzene ND 050 " <br /> Toluene ND 050 " <br /> Ethylbenzene ND 050 " <br /> Xylenes(total) ND 050 " <br /> Surrogate a a a-Tris luorotoluene 294 300 98 65-135 <br /> Surrogate 4-Bromofluorobenzene 297 300 99 65-135 <br /> Laboratory Control Sample(3060348-BSI) Prepared&Analyzed 06/16/03 <br /> Gasoline Range Organics 2410 50 ug/I 2750 88 65-135 <br /> Benzene 397 050 33 5 119 65-135 <br /> Toluene 216 050 202 107 65-135 <br /> Othylbenzene 452 050 475 95 65-135 <br /> Xylenes(total) 234 050 240 98 65-135 <br /> Surrogate aaa-Trfluorotoluene 332 300 Ill 65-135 <br /> Surrogate 4-Bromofluorobenzene 319 300 106 65-135 <br /> Matrix Spike(3060348-MSI) Source P306134-03 Prepared&Analyzed 06/16/03 <br /> Gasoline Range Organics 2370 50 ug/l 2750 18 86 65-135 <br /> Benzene 38 1 050 335 ND 114 65-135 <br /> Toluene 215 050 202 022 106 65-135 <br /> Ethylbenzene 439 0 50 475 ND 92 65-135 <br /> Xylenes(total) 229 0 50 240 ND 95 65-135 <br /> Surrogate a a a-Trifluorotoluene 330 300 110 65-135 <br /> Surrogate 4-Bromofluorobenzene 320 300 107 65-135 <br /> Matrix Spike Durr(3060348-MSD1) Source P306134-03 Prepared&Analyzed 06/I6/03 <br /> Gasoline Range Organics 2370 50 ug/l 2750 18 86 65-135 0 20 <br /> Benzene 37 6 050 335 ND 112 65-135 1 20 <br /> Toluene 208 050 202 022 103 65-135 3 20 <br /> Ethylbenzene 434 050 475 ND 91 65-135 1 20 <br /> Xylenes(total) 226 050 240 ND 94 65-135 1 20 <br /> Surrogate a a a-Triuorotoluene 326 300 109 65-135 <br /> Surrogate 4-Bromofluorobenzene 321 300 107 65-135 <br /> Sequoia Analytical-Petaluma 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 /> Page 7 of 12 <br />