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Sequoia 819 Stnker Ave Ste 8 <br /> Sacramento CA 95834 <br /> IiW Analytical (916)921-9600 <br /> FAX(916)921-0100 <br /> xvww sequoialabs con <br /> IWeston Solutions Inc-Walnut Creek Project San Joaquin HSA S404035 <br /> 1575 Treat Blvd Ste 212 Project Number 1st Quater 2004 Reported <br /> Walnut Creek CA,94596 ProjectManager Jessica Levine 04/15/04 13 07 <br /> Purgeable Hydrocarbons and BTEX by EPA 8015B/8021B - Quahty Control <br /> Sequoia Analytical-Sacramento <br /> Reporting Spike Source %REC RPD <br /> Ana[y[c Result Limn Units Level Resell %REC Limits RPD Limn Notes <br /> IBatch 4040025-EPA 5030B(P/T) <br /> Blank(4040025-BLK5) Prepared&Analyzed 04/08/04 <br /> Gasoline Range Organics(C4 C12) ND 50 ug/l <br /> I Benzene ND 0 50 <br /> Toluene ND 0 50 <br /> Ethylbenzene ND 0 50 <br /> Xylenes(total) ND 0 50 <br /> Surrogate a a a Trrfluorotoluene 11 0 10 0 11D 60-140 <br /> Laboratory Control Sample(4040025-BSI) — Prepared&Analyzed 04/02/04 _ <br /> Benzene 10 5 0 50 ug/1 100 105 70 130 <br /> Toluene 11 0 0 50 100 110 70-130 <br /> Ethylbenzene Il 6 0 50 10 0 lt6 70-130 <br /> Xylenes(total) 34 5 0 50 30 0 115 70-130 <br />�.Sidrrogale a a a Trefluoi otoluene 10 3 100 103 60-140 <br /> Laboratory Control Sample(4040025-BS2) Prepared&Analyzed 04/03/04 <br /> Benzene 909 050 ug/1 10 0 91 70 130 <br /> Toluene 9 38 050 100 94 70 130 <br /> Ethylbenzene 9 87 050 100 99 70-130 <br /> Xylenes(total) 30 0 050 30 0 100 70 130 <br /> Suri ogale aaa-Trif7uoi otoluene 11 0 100 110 60-140 <br /> Laboratory Control Sample 4040025-BS3 Prepared&Analyzed 04/06/04 <br /> Benzene 10 7 0 50 ugA 100 107 70-130 <br /> I Toluene 11 1 050 100 1 1 1 70-130 <br /> Ethylbenzene 11 7 0 50 100 11-7 70 130 <br /> Xylenes(total) 344 050 300 115 70-130 <br /> ISurrogate aaa-Ti ifluorotoluene 11 3 100 113 60-140 <br /> Sequoia Analytical-Sacramento The results in this teporl apply to the samples analyzed in accordance with the chain <br /> ofcustody document Unless other;ise stated results are reported on a;et vveight <br /> basis This anal[tical repott mutt be r epioduced in as enirreiy <br /> IPage 5 of 7 <br />