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I819 Straker A`e Ste 8 <br /> Sequoia Sacramento CA 95834 <br /> Analytical (916)921 9600 <br /> I FAX(916)921-0100 <br /> www sequotalabs con <br /> IWeston Solutions Inc-Walnut Creek Project San Joaquin HSA 5404035 <br /> 1575 Treat Blvd,Ste 212 Project Number 1st Quater 2004 Reported <br /> I Walnut Creek CA,94596 Project Manager Jessica Levine 04/15/04 13 07 <br /> Purgeable Hydrocarbons and BTEX by EPA 8015B/8021B-Quahty Control <br /> Sequoia Analytical-Sacramento <br /> IReporting Spike Source %REC RPU <br /> Analyte Result Limit Units Level Result %REC Limits RPD Limit Notes <br /> IBatch 4040025-EPA 50308 P/T <br /> Blank(4040025-BLK1) Prepared&Analyzed 04/02/04 <br /> Gasoline Range Organics(C4-C12) ND 50 ugA <br /> I Benzene ND 050 <br /> Toluene ND 0 50 <br /> Ethylbenzene ND 0 50 <br /> I Xylenes(total) ND 0 50 <br /> Surrogate a a a-Try7trorololuene 100 100 100 60 140 <br /> Blank(4040025-BLK2) — Prepared&Analyzed 04/03/04 T <br /> I Gasoline Range Organics(C4 C 12) ND 50 ug/l <br /> Benzene ND 0 50 <br /> Toluene ND 050 <br /> Ethylbenzene ND 050 <br /> I Xylenes(total) ND 0 50 ' <br /> Surrogate a a a-Trefluorotoluene 11 3 1100 113 60 140 <br /> Blank(4040025-BLK3) Pre2ared&Analyzed 04/06/04 - <br /> I Gasoline Range Organics(C4-C12) ND 50 ug/l <br /> Benzene ND 050 <br /> Toluene ND 050 <br /> I Ethylbenzene ND 050 ; <br /> Xylenes(total) ND 050 <br /> Surrogate a a a-Trefluorotoluene 11 1 100 111 60-140 <br />' Blank(4040025-BLK4) Prepared&Analyzed 04107/04_ <br /> Gasoline Range Organics(C4 C12) ND 50 ug/l <br /> Benzene ND 0 50 <br /> Toluene ND 0 50 <br /> Ethylbenzene ND 0 50 <br /> Xylenes(total) ND 0 50 <br /> Surrogate aaa-Trifluoiotoluene 11 3 1100 113 60-140 <br /> I <br /> ISequoia Analytical-Sacramento The results in this report apply to the sainples analyzed in accordance with the chain <br /> of custody document Unless otherwise stated r esults m e reported on a wet rterght <br /> . bases This analytical report must be reproduced en its entirety <br /> IPage 4 of 7 <br /> I <br />