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819 Striker Avenue Suite 8 <br /> 1 <br /> Sequoia Sacramento CA 95834 <br /> (916)921-9600 <br /> 101) <br /> Analytical FAX equo gabs21 com <br /> www sequolalabs cpm <br />' Weston Solutions,Inc-Walnut Creek Project San Joaquin HSA 5212417 <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 RPD <br /> Analyte Result Limit Units Level Result %REC lAnuts RPD limit Notes <br /> Batch 2120378-EPA 5030B P/T <br /> Blank(2120378-BLK1) Prepared&Analyzed 12/23/02 <br /> Purgeable Hydrocarbons ND 50 ug/1 <br />' Benzene ND 050 " <br /> Toluene ND 050 <br /> Ethylbenzene ND 050 " <br /> Xylenes(total) ND 050 " <br /> Surrogate a a a-Tris luorotoluene 103 <br /> 100 103 60-140 <br /> Blank(2120378-BLK2) Prepared&Analyzed 12/24/02 _ <br />'Purgeable Hydrocarbons ND 50 ug/1 <br /> Benzene ND 050 <br /> Toluene ND 050 " <br /> *1hy.1'ben2-e <br /> ND 0 50 " <br /> s(total) ND 050gate aaa-Tri�luorotoluene � 102 " 100 102 60-140 <br />'Laboratory Control Sample(2120378-BS1) Prepared&Analyzed 12/23/02 <br /> Benzene 931 0 50 ug/i 100 93 70-130 <br /> Toluene 990 0 50 10 0 99 70-130 <br /> 1 Ethylbenzene 9 94 0 50 „ 100 99 70-130 <br /> Xylenes(total) 298 0 50 300 99 70-130 <br /> Surrogate a a a-Treuorotoluene 108 100 108 60-140 <br />,Laboratory Control Sample(2120378-BS2) Prepared&Analyzed 12/24/02 <br /> Benzene 935 0 50 ug/1 100 94 70-130 <br /> Toluene 9 94 050 100 99 70-130 <br /> Ethylbenzene 9 76 0 50 100 98 70-130 <br /> Xylenes(total) 287 0 50 300 96 70-130 <br /> Surrogate a a a-Triuorotoluene 112 100 112 60-140 <br /> uoia 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 6 of 11 <br />