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f <br /> ID Sequoia walnJ� e9 <br /> (925)968-9600 <br /> -IRW Analytical PAXequO 9 967n <br /> m <br /> v�sequolalabs co <br />' Roy F Weston-Walnut Creek Project San Joaquin HSA <br /> 1575 Treat Blvd Ste 212 Project Number - Reported <br /> Walnut Creek CA 94596 Project Manager Jessica Levine 21-Feb-02 18 42 <br />' Total Purgeable Hydrocarbons (C6-C12) and BTEX by DHS LUFT - Quality Control <br /> Sequoia Analytical - Walnut Creek <br />' <br /> Analyte Reporting Spike Source %REC RPD <br /> Result Limit Units Level Result %REC Limits RPD Limit Notes <br /> Batch 2BO7009- EPA 50308 PIT <br />' Matrix Spike Dup(2807009-MSDI) Source W202081-01 Prepared&Analyzed 07-Feb-02 <br /> Benzene 150 �0 50 ug/I 200 ND 75 70-130 1-8 —2 0 - <br /> Toluene 178 050 200 ND 89 70-130 3 20 <br />' Ethylbenzene 17 6 050 200 ND 88 70-130 3 20 <br /> Xylenes(total) 57 1 050 600 ND 95 70-130 2 20 <br /> Surrogate a a a-Triffuorotoluene 291 <br /> 300 97 70-130 <br /> 1 <br /> 10 <br /> I <br /> Sequoia Analytical- Walnut Creek The results to this report apply to the samples analyzed in accordance with the chain of <br /> . custody document This analytical report must be reproduced to its entirety <br /> 7 of 8 <br />