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1 <br /> 9 Striker Ave Ste 8 <br /> Sequoia Sacramento CA 95834 <br /> 4D (916)921-900 <br /> ,fir Analytical FAX(916)921 0100 <br /> www sequoialabs com <br /> Weston Solutions Inc-Walnut Creek Project San Joaquin HSA 5412468 <br />' 1575 Treat Blvd,Ste 212 Project Number N/A Reported <br /> Walnut Creek CA,94596 Project Manager Michelle Zehr 01/04/05 13 32 <br /> Purgeable Hydrocarbons and BTEX by EPA 8015B/8021B-Quality Control <br />' Sequoia Analytical-Sacramento <br /> Reporting Spike Source %REC RPD <br />' Analyte Result Limit Umts Level Result %REC Limits RPD Limit Notes <br /> Batch 4120334-EPA 5030B (P/T /EPA 8015BI8021B <br /> Blank(4120334-BLKI) Prepared&Analyzed 12/23/04 <br /> Gasoline Range Organics(C4-C 12) ND 50 USA <br /> Benzene ND 0 50 <br /> Toluene ND 0 50 " <br /> Ethylbenzene ND 0 50 <br /> Xylenes(total) ND 0 50 <br /> Surrogate 4-BFB(FID) 998 100 100 60-140 <br /> Surrogate a a a-TFT(PID) 911 100 91 60-140 <br /> Blank(4120334-BLK2) Prepared&Analyzed 12/27/04 <br /> Gasoline Range Organics(C4-C 12) ND 50 ugA <br /> Benzene ND 0 50 " <br /> Maloluene <br /> ND 0 50 <br /> thylbe <br /> thylbnzene ND 4 50 <br /> Xylenes(total) ND 0 50 <br />' Surrogate 4-BFB(FID) 994 100 99 60-140 <br /> Surrogate a a a-TFT(PID) 8 75 100 88 60-140 <br /> Laboratory Control Sample 4120334-BS1 Prepared&Anal zed 12/23/04 <br /> 1 Benzene 10 1 0 50 ugA 10 0 101 70-130 <br /> Toluene 9 95 0 50 100 100 70-130 <br /> Ethylbenzene 999 0 50 100 100 70-130 <br /> Xylenes(total) 297 0 50 300 99 70-130 <br />' Surrogate 4-BFB(FID) 100 ii 100 100 60-140 <br /> Surrogate a a a-TFT(PID) 864 100 86 60-140 <br /> Laboratory Control Sample(4120334-BS2) Prepared 12/27/04 Analyzed 12/28/04 <br /> Benzene 940 0 50 ug/l 100 94 70-130 <br /> Toluene 932 0 50 100 93 70-130 <br /> Ethylbenzene 930 0 50 100 93 70-130 <br />' Xylenes(total) 27 7 0 50 300 92 70-130 <br /> Surrogate 4-BFB(FID) 105 100 105 60-140 <br /> Surrogate a a a-TFT(PID) 8 94 100 89 60-140 <br /> Sequoia Analytical-Sacramento The results in this report apply to the samples analyzed in accordance with the <br /> chain of custody document Unless otherwise stated results are reported on a wet <br /> weight hasis This analytical report must be reproduced in its entirety <br /> Page 8 of 12 <br /> 1 <br />