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Sequoia <br /> 404 N CA Lane <br /> q Walnut Creek C8 94598 <br /> (92s)gsa-9600 <br /> Analytical FAX equo alabs98& c 73 <br />' www sequoialabs com <br /> • <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-Cl2) 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 2D24001 -EPA 5030B PIT <br /> Matrix Spike(2D24001-MSI) Source W204323-03 Prepared&Analyzed 29-Apr-02 <br /> Benzene 18 3 050 ugfl 200 ND 92 70-130 <br />' Toluene 168 050 200 ND 84 70-130 <br /> Ethylbenzene 181 050 200 ND 90 70-130 <br /> Xylenes(total) 503 050 600 ND 84 70-130 <br />' Surrogate a a a-Trifluorotoluene 316 300 105 70-130 <br /> Matrix Spike Dup(2D24001-MSDI) Source W204323-03 Prepared&Analyzed 29-Apr-02 <br /> Benzene 23 2 050 ug/l 200 ND 116 70-130 24 20 QR-02 <br />' Toluene 207 050 200 ND 104 70-130 21 20 QR-02 <br /> 6thylbenzene 202 050 200 ND 101 70-130 11 20 <br /> Xylenes(total) 62 8 050 600 ND 105 70-130 22 20 QR-02 <br /> a a a Tr�uorotoluene 374 300 125 70-130 <br /> $rogale <br /> tch 2D29003-EPA 5030B PIT <br />' Blank(2D29003-BLKI) Prepared&Analyzed 29-Apr-02 <br /> Purgeable Hydrocarbons(C6-C12) ND 50 ug/1 <br /> Benzene ND 050 " <br /> Toluene ND 050 " <br />' Ethylbenzene ND 0 50 " <br /> Xylenes(total) ND 0 50 <br /> Surrogate a a a-Triuorotoluene 342 300 114 70-130 <br />' Blank(2D29003-BLK2) Prepared&Analyzed 30-Apr-02 <br /> Purgeable Hydrocarbons(C6-C12) ND 50 ugll <br /> Benzene ND 0 50 " <br /> Toluene ND 050 <br /> Ethylbenzene ND 0 50 " <br /> Xylenes(total) ND 050 " <br />' Surrogate a a a Trifluorotoluene 33 7 300 112 70-130 <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 /> 4 of 7 <br />