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Sequoia Walnut Creek CA 94598 <br /> 988-9600 <br /> FAX(925)988-9673 <br /> Analytical www sequolalabs com <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 03-May-02 18 30 <br /> Total Purgeable Hydrocarbons (C6-C12) and BTEX by DHS LUFT - Quality Control <br /> Sequoia Analytical_ Walnut Creek <br /> Reporting Spike Source %REC RPD <br /> Analyte Result Limit Units Level Result %REC Limits RPD Limit Notes <br />' Batch 2D29003-EPA 5030B P/T <br /> Matrix Spike(2D29003-MSI) Source W204393-04 Prepared&Analyzed 30-Apr-02 <br /> Benzene 219 0 50 ug/l 200 ND 110 70-130 <br />' Toluene 19 7 0 50 200 ND 98 70-130 <br /> Ethylbenzene 203 050 200 ND 102 70-130 <br /> Xylenes(total) 612 050 600 ND 102 70-130 <br />' Surrogate a a a-Triuorotoluene 342 300 114 70-130 <br /> Matrix Spike Dup(2D29003-MSD1) Source W204393-04 Prepared&Analyzed 30-Apr-02 <br /> Benzene 22 6 050 ug/l 200 ND 113 70-130 3 20 <br />' Toluene 200 0 50 200 ND 100 70-130 2 20 <br /> Ethylbenzene 21 2 050 200 ND 106 70-130 4 20 <br /> Xylenes(total) 595 050 600 ND 99 70-130 3 20 <br />'Wogate a a a-Trrfluorotoluene 360 300 120 70-130 <br /> I <br /> 1 <br /> Sequoia Analytical- Walnut Creek The results in this report apply to the samples analyzed in accordance with the chain of <br /> custody document This analytical report must be reproduced in its entirety <br /> 1 <br /> 6 of 7 <br /> I <br />