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'--�� 819 Straker Ave Ste 8 <br /> Sequoia Sacramento CA 95834 <br /> ► (916)921-9600 <br /> Analytical <br /> FAX(9L6)92i 0100 <br /> www sequoialabs cam <br /> Geological Technics,Inc Project Montas Bros S504379 <br /> 1101 7th Street Project Number 724 2 Reported <br />' Modesto CA,95354 Project Manager Mandeep Singh 05/05/05 10 29 <br /> Purgeable Hydrocarbons and BTEX by EPA 8015B/8021B -Quality Control <br /> Sequoia Analytical- Sacramento <br /> Reparnng Spike Source %REC RPD <br /> Analyte Result Limit Units Level Result %REC Limits RPD Limit Notes <br /> Batch 5040250-EPA 5030B IT 1 EPA 8015BI8021B <br /> Blank(5040250-BLKI) Prepared&Analyzed 04/20/05 <br /> 1 Gasoline Range Organics(C4-C 12) ND 50 ug/l <br /> Benzene ND 050 " <br /> Toluene ND 050 <br /> Ethylbenzene ND 050 " <br /> ' Xylenes(total) ND 050 <br /> Metbyl tort-butyl ether ND 20 <br /> Surrogate 4-BFB(FID) 117 100 117 60-140 <br /> ' Surrogate a a a-TFT(PID) 892 100 89 60-140 <br /> Blank(5040250-BLK2) Prepared&Analyzed 04/21/05 <br /> Gasoline Range Organics(C4-C 12) ND 50 ug/l <br /> enzene ND 050 <br /> luene ND 050 <br /> thylbenzene ND 050 " <br /> Xylenes(total) ND 050 " <br /> ' Methyl tert-butyl ether ND 20 i <br /> Surrogate 4-BFB(FID) 106 100 106 60-140 <br /> Surrogate a a a-TFT(PID) 859 100 86 60-140 <br /> ' Laboratory Control Sample(5040250-BSI) Prepared&Analyzed 04/20/05 <br /> Benzene 924 0 50 ug/l 10 0 92 70-130 <br /> Toluene 9 19 0 50 100 92 70-130 <br /> Ethylbcnzene 938 050 100 94 70-130 <br /> Xylenes(total) 27 6 050 300 92 70-130 <br /> Methyl tert-butyl ether 964 20 100 96 70-130 <br /> Surrogate 4 BFB(FID) 108 100 108 60-140 <br /> Surrogate a a a-TFT(PID) 8 50 100 85 60-140 <br /> ' Sequoia Analytical-Sacramento The results in this report apply to the samples analyzed in accordance with the chain of <br /> custody document Unless otherwise stated results are reported on a wet weight basis <br /> This analytical report must be reproduced in its entirety <br /> Page 8 of 10 <br />