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S 19 Sutker Ave Ste 8 <br /> Sequoia Sacramento CA 95834 <br /> (916)921 9600 <br /> FAX 921 0 100 <br /> A � Analytical wwseq 6) labscOM <br /> www sequoiala! com <br />' Weston Solutions,Inc-Walnut Creek Project San Joaquin HSA 5401313 <br /> 1575 Treat Blvd,Ste 212 Project Number 4th Quarter Sampling Reported <br />' Walnut Creels CA,94596 Project Manager Jessica Levine 01/28/04 13 41 <br /> Purgeable Hydrocarbons and BTEX by EPA 8015B18021B- Quality Control <br /> Sequoia Analytical- Sacramento <br />' Reporting Spike Source %REC RPD <br /> Analyte Result Limit Units Level Result %REC Limits RPD Limit Notes <br />' Batch 4010202-EPA 5030E(PIT) <br /> Blank(4010202-BLKI) Prepared&Analyzed 01/19/04 <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 aaa-Tris luorotoluene 124 100 124 60-140 <br /> Blank(4010202-BLK2) Prepared&Analyzed 01/20/04 <br /> Gasolme Range Organics ND 50 ug/1 <br /> Benzene ND 050 <br /> Toluene ND 0 50 <br /> Ethylbenzene ND 050 <br /> ylenes(total) ND 050 <br /> urrogate a a a-Trtfluorotoluene 13 7 100 137 60-140 <br /> Laboratory Control Sample(4010202-BSI) Prepared&Analyzed 01/19/04 <br />' Benzene 115 0 50 eig/I 100 115 70-130 <br /> Toluene 11 l 0 50 100 1 1 1 70-130 <br /> Ethylbenzene 11 1 050 100 111 70-130 <br /> Xylenes(total) 334 050 300 111 70-130 <br /> Surrogate a a a Trti luorotoluene 109 100 109 60-140 <br /> Laboratory Control Sample(4010202-BS2) Prepared&Analyzed 01/20/04 <br />' Benzene 112 050 ug/] 100 112 70-130 <br /> Toluene 107 050 100 107 70-130 <br /> Ethylbenzene 104 050 100 104 70-130 <br /> Xylenes(total) 319 050 300 106 70-130 <br /> Surrogate a a a-Trti luorotoluene 138 100 138 60-140 <br /> Sequoia Analytical- Sacramento The results to 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 hasis <br /> This analytical report must be reproduced in its enttret3 <br /> Page 7 of 10 <br />