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' 404 N Wiget Lane <br /> Sequoia Walnut Creek c 94598 <br /> (92S)988 8-9600 <br /> 673 <br /> Analytical FAX equo alabs c m <br />' www secluoEalabs 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 (C&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 2D24001 -EPA 5030B PIT <br /> Blank(2D24001-BLKI) Prepared&Analyzed 26-Apr-02 <br /> Purgeable Hydrocarbons(C6-C12) ND SO ug/l <br />' Benzene ND 050 " <br /> Toluene ND 0 50 " <br /> Ethylbenzene ND 0 50 " <br /> Xylenes(total) ND 0 50 °r <br /> Surrogate a,a a-Tr�uorotoluene 330 300 110 70-130 <br /> Blank(2D24001-BLK2) Prepared&Analyzed 29-Apr-02 <br />' Purgeable Hydrocarbons(C6-C12) ND 50 ug/l <br /> Benzene ND 0 50 <br /> Toluene ND 050 " <br /> 140 ylbenzene ND 0 50 <br /> enes(total) ND 050 " <br /> Surrogate a a a-Triuorololuene 342 300 114 70-130 <br />' LCS(2D24001-BSI) Prepared&Analyzed 26-Apr-02 <br /> Benzene 207 050 ug/l 200 104 70-130 <br /> Toluene 185 050 200 92 70-130 <br />' Ethylbenzene 181 0 50 " 200 90 70-130 <br /> Xylenes(total) 583 0 50 600 97 70-130 <br /> Surrogate a a a-Tris luorotoluene 311 300 104 70-130 <br />' LCS(2D24001-BS2) Prepared&Analyzed 29-Apr-02 <br /> Benzene 18 8 050 ugfl 200 94 70-130 <br /> Toluene 176 050 20 0 88 70-130 <br />' Ethylbenzene 176 050 20 0 88 70-130 <br /> Xylenes(total) 554 050 600 92 70-130 <br /> Surrogate a a a-Trruorotoluene 31 7 300 106 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 to its entirety <br /> 3 of 7 <br /> 1 <br />