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' 404 N Wiget Lane <br /> Sequoia Walnut Creek CA 94598 <br /> (925)988-9600 <br /> Analytical www <br /> 988-9673 <br /> sequequoialabs corn. <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 /> IReporting Spike Source %REC RPD <br /> Analyte Result Limit Units Level Result %REC Limits RPD Limit Notes <br /> Batch 2D29003-EPA 5030B PIT <br /> Blank(2132.9003-ELKS) Prepared&Analyzed 02-May-02 <br /> Purgeable Hydrocarbons(C6-C12) ND 50 ugfl <br /> Benzene ND 050 <br /> i <br /> Toluene ND 0 50 <br /> Ethylbenzene ND 0 50 " <br />' Xylenes(total) ND 0 50 <br /> Surrogate a a a-Trifluorotoluene 325 300 108 70-130 <br /> LCS(2D29003-BSI) Prepared&Analyzed 29-Apr-02 <br />' Benzene 188 0 50 ug/l 200 94 70-130 <br /> Toluene 17 6 0 50 200 88 70-130 <br /> Ethylbenzene 176 050 200 88 70-130 <br />' X_ylenes(total) 554 0 50 600 92 70-130 <br /> 1 rogate a a a-Tri luorotoluene 31 7 300 106 70-130 <br /> LCS(2D29003-BS2) Prepared&Analyzed 30-Apr-02 <br />' Benzene 21 0 050 ug/l 200 105 70-130 <br /> Toluene 18 8 050 n 200 94 70-130 <br /> Etbylbenzene 19 2 050 200 96 70-130 <br />' Xylenes(total) 583 050600/I 97 70-130 <br /> i l <br /> Surrogate a a a-Truorotoluene 330 300 110 70-130 <br /> LCS(2D29003-BS5) Prepared&Analyzed 02-May-02 <br />' Benzene 16 6 050 ug/I 200 83 70-130 <br /> Toluene 184 050 20 0 92 70-130 <br /> Ethylbenzene 187 050 " 200 94 70-130 <br />' Xylenes(total) 572 050 600 95 70-130 <br /> Surrogate a,a a-Tris luorotoluene 33 2 300 111 70-130 <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 /> I <br /> 5 of 7 <br /> I <br />