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819 Striker Avenue Suite 8 <br /> Sequoia Sacramento CA 95834 <br /> (916)921-9600 <br /> 21-0100 <br /> Analytical FAX�olal <br /> I157 <br /> ston Solutions,Inc-Walnut Creek Project San Joaquin HSA S212417 <br /> 5 Treat Blvd,Ste 212 Project Number N/A Reported <br /> lnut Creek CA,94596 Project Manager Jessica Levine12/30/02 18 32 <br /> _ <br /> Total Purgeable Hydrocarbons and BTEX by DHS LUFT Quality Control <br /> Sequoia AnaIytical - Sacramento <br /> Reporting Spike Source %REC RPD <br /> Analyte Result Limit Units Level Result %REC Limits RPD Limit Notes <br />'Batch 2120429-EPA 5030B P <br /> Laboratory Control Sample Dup(2120429-BSD1) Prepared&Analyzed 12/24/02 <br /> Benzene 949 0 50 ug/l 100 95 70-130 2 25 <br /> Toluene 939 050 100 94 70-130 2 25 <br /> Ethylbenzene 949 050 100 95 70-130 1 25 <br /> Xylenes(total) 284 050 300 95 70-130 3 25 <br /> Surrogate a a a-Trifluorotoluene 101 100 101 60-140 <br /> Duplicate(2120429-DUPl) Source 5212411-04 Prepared 12/24/02 Analyzed 12/26/02 <br /> Purgeable Hydrocarbons ND 50 ug/l ND 200 <br />'Benzene ND 050 1, ND 200 <br /> Toluene ND 0 50 ND 200 <br /> Ethylbenzene ND 050 ND 200 <br /> Xylenes(total) ND 0 50 9 0 200 <br /> gatE a a a-TriJluorotoluene 886 " 100 89 60-140 <br /> 1 <br /> uota Analytical-Sacramento 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 />' Page 10 of 11 <br />