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1819 Striker Avenue Suite 8 <br /> Ki) Sequoia Sacramento CA 95834 <br /> (916)921-9600 <br /> 921-0100 <br /> Analytical <br /> FAX�of <br /> Weston Solutions,Inc-Walnut Creek Project San Joaquin HSA S212417 <br /> 1575 Treat Blvd,Ste 212 Project Number N/A Reported <br /> Walnut Creek CA,94596 Project Manager Jessica Levine 12/30/02 18 32 <br /> Total Purgeable Hydrocarbons and BTEX by DHS LUFT - Quality Control <br /> Sequoia Analytical- Sacramento <br />' Reporting Spike Source %REC APD <br /> Analyte Result Lamit Units Level Result %REC Limits RPD Limit Notes <br /> Batch 2120428-EPA 5030B (111) <br /> Laboratory Control Sample(2120428-BS2) Prepared&Analyzed 12/26/02 <br /> Benzene 934 050 ug/1 100 93 70-130 <br /> Toluene 996 050 100 100 70-130 <br /> Ethylbenzene 100 050 100 100 70-130 <br /> Xylenes(total) 294 050 300 98 70-130 <br /> Surrogate a a a-Trifluorotoluene 112 100 112 60-140 <br /> Duplicate(2120428-DUP1) Source 5212417-02 Prepared&Analyzed 12/26/02 <br /> Purgeable Hydrocarbons ND 50 ug/l ND 4 200 <br /> Benzene ND 050 ND 200 <br /> Toluene ND 050 ND 200 <br /> Ethylbenzene ND 050 ND 200 <br /> Xylenes(total) ND 050 ND 200 <br /> 59gale a a a-Trifluorotoluene 999 100 100 60-140 <br /> Batch 2120429-EPA 5030B(IM) <br />'Blank(2120429-BLK1) Prepared&Analyzed 12/24/02 <br /> Purgeable Hydrocarbons ND 50 ug/1 <br /> Benzene ND 0 50 " <br /> 1 Toluene ND 050 " <br /> Ethylbenzene ND 050 <br /> Xylenes(total) ND 050 " <br /> Surrogate a a a-Trifluorotoluene 8 79 100 88 60-140 <br /> Blank(2120429-BLK2) Prepared&Analyzed 12/26/02 <br /> Purgeable Hydrocarbons ND 50 ugA <br />'Benzene ND 050 <br /> Toluene ND 050 <br /> Ethylbenzene ND 050 " <br /> Xylenes(total) ND 050 " <br /> Surrogate a a a-Trifluorotoluene 876 100 88 60-140 <br /> 1 <br /> nota Analytical-Sacramento The results in this report apply to the samples analyzed in accordance with the chain of <br />' custody document Thu analytical report must be reproduced in its entirety <br />' Page 8 of 11 <br />